Sternenfotografie Dr. Hager

Galaxien

Auf Wunsch sind die Bilder auch in besseren Auflösungen vorhanden!

NGC 253 - Die Bildhauer Galaxie

Diese wunderschöne Milchstrasse ist unserer recht nahe, denn in knapp 12 Mio. Lichtjahren entfaltet sie ihre volle Pracht im Sternbild des Bildhauers (daher der Name).

Damit sind wir in unseren Breiten nicht recht vertraut, da sich dieses Sternzeichen kaum über den Horizont erhebt.

Auf diesem Bild, welches knapp 20 Stunden Gesamtbelichtungszeit beinhaltet, zeigt sie sich in der scheinbaren Größe des Mondes.

Wir sehen viele junge heiße Sternpopulationen (blaue Felder) und die königlich residierenden "alten Herren" der Sterncluster in goldgelber Farbe.

Das besondere an dieser Milchstrasse ist ihr sehr imposantes Staubband. Dieser galaktische Staub ist "heilig" für jede Galaxie, da u.a. aus ihm weitere neue Sternsysteme in ihr entstehen.

Man gewinnt bei längerer Betrachtung den Eindruck, dass einige dieser Staubstrukturen zylinderartig rechtwinkelig zur Längsachse aus der Milchstrasse wie "Kaminrauch" herausströmen.

Im Hintergrund tummeln sich zahlreiche weitere Milchstrassen, die jdeoch nur mehr als kleinste, kommaartige Strukturen zu erkennen sind, da sie mehrere Milliarden Lichtjahre entfernt stehen.

Die Bilddaten hat mein Freund Eric in seiner remote gesteuerten Sternwarte aufgenmommen und mir zugesandt. Zu meiner sehr großen Freude waren die Daten hervorragend und damit war es ein leichtes, so ein schönes Bild zu kreieren.

Dieses Bild wird auch von der NASA veröffentlicht!

Viel Freude beim Betrachten.

M65-66

M65-66 - 2 Juwele im Sternzeichen "Löwe"

Im Sternbild des "Löwe" finden sich diese beiden Juwele am nächtlichen Himmel. Sie können bereits in einem licht starken Feldstecher gesehen werden.

Für diese Aufnahme aber, haben Torsten Grossmann und ich viele Stunden Belichtungszeit investiert mit einer 6" Optik; einem apochromatischen Lisenfernrohr.

Das Licht der Milchstrassen, die hier abgebildet sind, war 30 Mio Jahre unterwegs, bis es auf unseren CCD Chip gefallen ist und sich dort verewigen konnte.

Wie sah die Erde aus vor 30 Mio Jahren? Damals gab es anstelle der Alpen gerade mal ein paar Hügel, und auch das Mittelmeer war noch nicht gefüllt in der Form, wie wir heute darin im Urlaub baden. §0 Mio Jahre war das Licht völlig ungehindert am Nachthimmel unterwegs, um dann, ganz zum Schluß der Reise, in den letzten paar hundert Metern der Athmosphäre bei nahe verschluckt zu werden aufgrund der Lichtverschmutzung. Unsere Sternwarten stehen zwar ausserhalb von Städten, aber dennoch wird es nicht mehr ausreichend dunkel hier.

M65 66 haben ihre Namen vom Messier Katalog. Dieser geht zurück auf Charles Messier, der im 18. Jahrhundert einen Katalog angelegt hat mit Objekten, die er am nächtlichen Himmel fand.

Diese wollte er kartografieren, weil sie ihm auf der Suche nach Kometen immer wieder untergekommen sind. Zu seiner Zeit gab es eine regelrechte Kometenjagd und man fand diese Objekte, wie hier im Bild, als störend.

Auch dieses Bild gibt es auf Anfrage in voller Auflösung.


NGC5078-LRGB

NGC 5058 und 5101

Dieses Bild zeigt uns einen Himmelsausschnitt im Sternbild "Hydra". Dieses Sternzeichen ist praktisch nur von der Südhalbkugel gut beobachtbar.

Mein Kollege Eric Benson hat dort wunderbare Bilddaten gesammelt, welche ich zu diesem Bild verarbeitet habe.

Das besondere an diesen Objekten ist, dass wir Sterne darauf sehen, die in unmittelbarer Nachbarschaft sich befinden, also wenige Lichtjahre weit weg sind. Und im Hintergrund zeigen sich Milchstraßen, welche gerade noch als dunkelrote Punkte erkennbar sind. Diese Milchstrassen sind aufgrund der enormen Entfernung so weit ins rote Licht verschoben. Die Entfernung beträgt  über 8 Mrd Lichtjahre!

In keinem anderen Bild auf meiner Website zeigen sich solch enorme Kontraste bzgl der Entfernungen.

Die beiden Hauptobjekte sind die NGC 5101 (oben rechts) und NGC 5058. Bei beiden handelt es sich um Milchstraßen, ähnlich der "unseren", in der wir leben. Ihr Licht, welches Eric über einen Zeitraum von knapp 30 Stunden in seiner Sternwarte in Australien gesammelt hat, stammt aus einer Zeit, als sich auf Erden gerade das Mittelmeer gebildet hat, und als es noch keine Alpen gab. (Also etwa vor 100 Mio Jahren).

Auf 5058 sehen wir recht genau von der Seite (Kantenstellung) drauf, und bei 5101 quasi direkt von "oben". Beides sind Balkenspiralgalaxien.

Verstreut im Bild finden sich noch viele weiter entfernte Galaxien (die größeren, welche Farbe und Form geben, sind einige hundert Mio Lichtjahre entfernt).

Insgesamt trifft auf dieses Bild der Spruch vom bedeutendsten Kosmologen der Renaissance, Giordano Bruno, zu: "Die Sonne mit ihren Planeten ist nur eines von Myriaden von Sternen in einem Weltall, das keine Grenzen kennt".

Dieses Bild ist der Mutter meiner Kinder gewidmet: Christine.

Dieses Foto wurde auch von der NASA veröffentlicht: http://apod.nasa.gov/apod/ap160525.html


M83 – Die Feuerradgalaxie des Südens

Wer kennt schon das Sternbild der Wasserschlange? In unseren Breiten nur wenige, da es recht tief am südlichen Horizont zur Ansicht kommt. Dabei beinhaltet sie eine der schönsten Milchstraßen, die man beobachten kann.

Aus 15 Mio. Lichtjahren Entfernung präsentiert sich diese majestätisch schöne Galaxie in ihrer vollen Ausbreitung. Da sie uns relativ nahe steht, gehört sie zur sogenannten lokalen Galaxiengruppe und ist somit eine Schwestergalaxie zu jener in der wir wohnen. Im Bild erkennt man zahlreiche nebulöse Gebilde, die rötlich oder rosarot erscheinen. Das sind spannende Gegenden, vergleichbar mit dem bekannten Orionnebel; es handelt sich also um Sternentstehungsgebiete in einer fremden Milchstraße, die wir dennoch von der Erde aus fotografieren können. Könnte man sie mit freiem Auge beobachten, so würde sie etwa 1/3 des Vollmondes am nächtlichen Himmel ausmachen.

In Kooperation mit Eric Benson, einem meiner befreundeten Astrofotografie-Kollegen aus Australien, entstand dieses Bild. Eric betreibt eine Remote Sternwarte in einer lichtunverschmutzten Gegend Australiens, wo sich M83 hoch am Himmel zeigt.

Es gibt auch eine Feuerradgalaxie des Nordens. Diese habe ich vor längerer Zeit ebenso fotografiert. Siehe dazu: http://www.universetoday.com/17824/the-firecracker-galaxy-ngc-6946-by-dietmar-hager/

20“ CDK Spiegelteleskop; FLI CCD Kamera; LRGB Bilddaten. Verarbeitet in CCD Stack, Pix Insight und Photoshop. Bildgewinnung: Eric Benson; Bildbearbeitung: Dietmar Hager.


NGC 7331 “Deerlick Gruppe”

Dieses (Vorschau)-Bild zeigt die wunderschöne Galaxien-Gruppe "Deerlick" im Sternzeichen "Pegasus".

Torsten Grossmann und ich haben mit unseren Sternwarten Bilddaten gesammelt. Torsten fotografierte südlich von Berlin mit seinem 7 Zoll TMB Apo.

15×15 Min Luminanz; und je 11×8 Min Rot, Grün und Blau. Am Fuß des Hansberg im Mühlviertel holte ich mit meinem 9 Zoll TMB Apo One-Shot Color CCD Daten (7 Stunden).

Das Bild ist wie immer eine Gemeinschaftsproduktion.

Nähere Information zur NGC 7331 gibt es auf 

Wikipedia

 bzw auf der 

NASA-Homepage

(dort bitte “NGC 7331″ eingeben).


Galaxie M81 + Holmberg IX – 9″ TMB Apo
Dec 08 + Jan 09

  • Date: Dec.+ Jan. 2008 – seeing 5-(7)/10; transp. 6-7/10
  • Scope: 9″ TMB Apo f/7 using TeleVue 0,8 reducer
  • CCD: SXV H16 L:3.5h 1×1; 1.7h 2×2 each color RGB.
    (10 min subs) no darks in 1×1, 3 darks in 2×2.
  • Software: Astroart 4, CCD Stack, CCD Sharp, Registax and Maxim DL
  • Processing: postprocess in PS CS2, Pix IS LE

M81 is probably one of the most popular galaxies among the celestial objects of the northern hemisphere. Discovered by Johann E. Bode in 1774, M81 is located in the constellation “Big dipper”. Shining at 7m0 visually she makes a wonderful target for a bino-viewer, as this sprial-galaxy is considerably large, measuring ~ 27×14 arc minutes (Compare the full moon appears at 31 arc minutes). In a distance of about 12 Mio LY, this galaxy is a bout 4 times more distant than the famous Andromeda-galaxy, the largest galaxy visible from the northern hemisphere. M81 is only the most prominent “star” of a bunch of galaxies, called the M81-group: M82, NGC 2403, NGC 2976, Holmerbg IX, NGC 3077 and others render further members of this group. In a decent amateur telescope (above 16″ aperture), however, M81 reveals her entire beauty, as you can then gaze into the spiral arms and see the very bright core, that, by the way, houses a super massive black hole, which comprises perhaps 100 Mio solar masses.

In regards to gravity, M81 is engaged to M82, respectfully. Actually these two are bound together by gravity and therefor rotate around a common center of gravity, bringing them quite close to each other. At present (presence would be what we humans of the 21st century can gather now) our own galaxy, the milkiway would merely fit inbetween M81-82; expressed in numbers we are looking at 120.000 LY distance between the two. M81-82 is fabeld to have gone through a severe interactive gravitational encounter some hundreds of million years ago. As a result, huge masses of gas, dust and also stars are strewn inbetween the two galaxies. Whenever galaxies collide or at least come close to eachother, serious changes take place, metamorphing the original phenotypical appearance of both galaxies. Consequently, M82 has turned into a so called “star-burst” galaxy, nursing now millions of new stars, which could be addressed as “off-spring” of such a galactic interaction.

In the image you might notice a small little irrgular looking structure a little above the galaxy and a little to the left. This object is a small satelltie-galaxy of M81, called Holmberg IX, named after its discoverer Erik B. Homlberg, a swedish astronomer of the last century. Near the bottom and a little to the left is one of a typical background galaxies, named PGC 29505, shining at about 17m0.

When Gerlinde Kaltenbrunner hovers in the highest mountains of the world, she might be able to spot this galaxy with bare eyes !


Galaxie M 82 – 7″ TMB Apo (Torsten Grossmann) and 9″ TMB Apo Fall 2011 NASA APOD

Messier 82 is one of my favourite galaxies because it is such a beautiful target for visual observation! The galaxy is located in the constellation of “Big Bear” aka as “big dipper”. You can spot the spectacular galaxy in a strong bino already. But when you observe M82 in a decent telescope of powerful light-collection capacity, it revelas a lot of the dust-lanes!

M82 is a so-called star-burst galaxy. This means, that stars form at a significant higher and more intense rate than in galaxies of comparable mass. One tends to believe this is linked to a dramatic gravitational effect, caused by the interaction with “near-by” M81. However, neary-by means 12 Mio Light-years. M82 is one of the best investigated “star-burst-galaxies”.

The redish areas in the image represent Hydrogen that emits strongly in Infra-Red and Radiowaves. Thie close encounter of the two neighbourghing galaxies is fabled to have taken place some 400 Mio years ago. Based upon observations in near Infrared-, Infrared- and Radiospace-telescopes as well as X-ray examinations the core of the galaxy might hold more than only one supermassive black hole.

Far to the right in the image you can identify a bit of a lighter area in space. This is not an artefact but a result of the tidal-effects based upon the gravitational interaction of the two galaxies M82 and M81.

Learn more about that beauty here (click).


Galaxie NGC 3628 – 9″ TMB Apo March 07

This majestic spiral galaxy, which we view exactly from the edge, is staged in an adequate constellation (Lion), suiting the huge size of ngc 3628. The longitudinal diamter is barely about 1/4 of the apparent size of the moon. That makes her pretty large! This said, and knowing that ngc 3628 shines at 9m5 visually, which is pretty bright for a galaxy that is roughly 35 Mio ligh-years away from our place, one still cannot understand, why Mr. Messier did not mention the galaxy in his famous catalogue, though he did so with the neighbouring very famous ones (M65,66), only half a moon away from the location.

BTW: These three are supposed to interact by gravitational means. There is evidence for such interaction, as you can find a faint so called “tidal trail” of stars to the left. These represent stars, that have been distracted by gravitational force of M65, 66. Like in so many cases, it was Wilhelm Herschel who discovered NGC3628 in 1784.

Should you be interested in a comparison with an older image taken with a one shot color CCD from Starlight Xpress SXVF M25C then please click the line “One shot color Image SXVF M25C (2007)” above.


Galaxie NGC 660 – 9″ TMB Apo @ Tao
Sept+Oct 09 NASA APOD

Discovered 1784 by William Herschel, this sepctacular galaxy is located in the constellation “pisces”. Holding 7.6 arc minutes by 2.8 arc minutes she is not exactly large, but rather bright as its apparent magnitude measures some 10m7, being about 24 Mio LY away from earth. As a result of these numbers we find ngc 660 to hold about 36.000 LY in diameter.

NGC 600 is counted among the so called “polar-ring-galaxies”, which is something peculiar among all galaxies known at present: Basically two galaxies were about to merge entirely, but by gravitational means of “dark matter” they have gotten “arrested” while undergoing the process of melting together. In an advanced stadium of such unification both galaxies are believed to no longer proceed further more into eachother. NGC 660 is also a strong candidate for a search for compact radio sources.


NGC 2683

This fantastic galaxy can be spotted in the constellation “Luchs” in the northern hemisphere. To perceive the light visually you would however need a telescope, as the brightness is limited by 9m7. In a distance to earth of about 27 Mio Light-years the appearent size of this galaxy measures 9.3 arc minutes by 2.2 arc minutes. That of corse means we are looking at the galaxy almost from the edge. Like in so many cases of first human ever to lay eyes on this object was Wilhelm Herschel on 5th of February 1788. Those days back the galaxy was considerably closer to earthbound observers, as ngc 2683 recedes at the tremendous speed of about 400 kilometers per second. For earthlings 3 Billion kilometers sounds a lot, but considering the huge distance of millions of light years, this is practcally insignificant.

Have you noticed the background-galaxy-gropu to the left? There is a region of very small reddish objects in the upper lieft quadrant of the field. These galaxies have been measured to some 4.3 Bio LY away from earth. That means, the light that reaches us nowadays comes from a time, when mother earth was about to be formed…(thanks Mischa Schirmer for looking up the data)


Galaxie NGC 4565 the needle – 7″ TMB APO April 09: Data aquisition by Torsten Grossmann. NASA APOD

NGC 4564 aka “Needle-Galaxy” is located in the constellation “Coma Berenices” in the northern hemisphere. Discovered by William Herschel in 1785 this amazing galaxy is seein exactly edge-on and it appears pretty large in an eye-piece of an average amateur-telescope. It’S typical “needle-like” shape can be spotted at around 45 power and the impressive dark dust-ribbon is revelaed beyond 150 power in a high contrast telescope. Measuring about 15 arcminutes by 2 arcminutes, she gives a quite spectacular view,as she shines also quite brightly in the night skies at around 9m5, which would let expect a Messier-number.

NGC 4565 is noted to be some 30 Mio LY away from earth. from one tip to the other we are looking at 100.000 Lightyears.


Galaxie NGC 4038+39 – 10″ Astrosib RC Spring 2011 NASA APOD

On 7th of February in 1785 William Herschel dicovered this impressive example of interactive galaxies. NGC 4038+39 are located in the constellation “corvus” and make a beautiful view in a decent telescope, as they are rather brightly shining around 10m4.

The light we see in this image was dispatched by the galaxy some 88 Mio years ago and we see now might have changed significantly meanwhile, as the process of interaction between galaxies is quite huge. Whenever galaxies merge they exchange their supplies of hydfrogen, yielding in massive “star-production”.

However, if you want to see the galaxies visually through a telescope, you will have to travel far south. Best spot would be on the southern hemisphere. Andrey Oreshko’s remote observatory location is perfectly situated in the Atacama desert, providing excellent conditions to image the socalled “Antenna-galaxies”.


NGC 7331 “Deerlick Gruppe”

Dieses (Vorschau)-Bild zeigt die wunderschöne Galaxien-Gruppe “Deerlick” im Sternzeichen “Pegasus”.

Torsten Grossmann und ich haben mit unseren Sternwarten Bilddaten gesammelt. Torsten fotografierte südlich von Berlin mit seinem 7 Zoll TMB Apo.

15×15 Min Luminanz; und je 11×8 Min Rot, Grün und Blau. Am Fuß des Hansberg im Mühlviertel holte ich mit meinem 9 Zoll TMB Apo One-Shot Color CCD Daten (7 Stunden).

Das Bild ist wie immer eine Gemeinschaftsproduktion.

Hier ist die Vollbildversion der Aufnahme mit einem großen Sternenfeld rund herum (klick: in neuem Tab öffnen bitte)


Galaxie NGC 3718 + NGC 3719 – 9″ TMB Apo March 2008 NASA APOD

Discovered by W. Herschel in April 1789 NGC 3718 is located in the constellation of the big dipper and is to be categorized as a Seyfert galaxy. It holds 8.2 by 3.5 arc minutes and appears to be 10m6 bright for the visual observer. While the galaxy is in a distance of some 52 Mio light years from earth, it’s warped spiral shape is pertubated by the neighbourghing galaxy NGC 3729, which is devided from 3718 by 150000 light years. Both are therefor interacting in a gravitational way, like the fainter galaxy couple south to 3718. These group of galaxies (Hickson 56 by name) is more than 400 Mio lightyears away from our planet.


NGC4631 Wal-Galaxie

Die NGC 4631 ist eine Spiralgalaxie, die wir sehr genau von der Seite, also in sogenannter “Kantenstellung” sehen können.

Zum Beobachten ist ein Teleskop ab 20cm Öffnung notwendig. In einem Fernrohr ab 50cm Öffnung sieht man dann schon ~ keinerlei Lichtverschmutzung vorausgetzt! ~ hervorragende Details in dieser sehr großen Milchstraße.

Sie ist etwa 25 Mio Lichtjahre entfernt. Das Licht, das zu diesem Foto verarbeitet worden ist, entstammt also einer Zeit, in der die Alpen gerade halb so hoch waren wie heute, da sich Afrika gerade erst mächtig gegen Europa schob… Nähere Info zur NGC4631:

Wikipedia

Die Fotodetails: 7″ und 9″ TMB Apo. Fotodatenmaterial wurde von meinem kongenialen Freund und Apo-Bruder Torsten Grossmann gesammelt. Die Bildbearbeitung machen wir in gewohnter Weise zusammen.


IC-10 Zwerggalaxie

IC 10 is a so called “dwarf-galaxy”, located in the constellation “Cassiopeia” in the northern hemisphere. Discovered in 1887 by Nicholas Mayall it also represents an irregular shaped galaxy. It took the astronomers of those days quite a while to identify the object to be an extragalactic one! This was achieved in 1935. Nowadays we know IC 10 to be some 2.5 Mio Lightyears away from our solar system.

Visual Magnitude of this tiny galaxy, that appears to be some 7 by 6 arc minutes of size, is 10m4 which sounds brighter than it really is. One needs quite a serious telescope to spot this galaxy, as the surface-brigthness of the galaxy is rather faint.

Scientific investigations of recent times revelaed this galaxy to be a so called “star-burst” galaxy. That means it produces lots of new hot star-clusters. Hydrogen supplies of IC10 is huge! It forms a sort of envelope around the galaxy-body that measures about 1 arc minute. In this image above one can spot this H2-envelope pretty well, that, surprisingly enough seems to rotate in the opposite direction, than the galaxy-body does. Also, when you open the “full-size” subpage or the “enlarged-cop” version, you will perhaps see lots of those small star-clusterts within the galactic body.

To the lower right you might notice some “luminousity” in space. That seems to be intergalactic Hydrogen; the matter of which all is made of in the universe in the first place.


Galaxie NGC 891 – 9″ TMB Apo October 08

Discovered on 6th of October 1784 this beautiful edge-on galaxy shines quite bright at 10m9 in the constellation Andromeda. Measuring 13.1 arcminutes along the longitudinal axis, the galaxy can be considered relatively large.

Observed in a huge (at least 20 inches aperture) telescope located in decent viewing-conditions, one can easily see the dust-lane, which happens to be quite prominent at 400 power and beyond. What we see is how the galaxy looked like some 28 Mio years ago. Back in those days the alpine formation was forming on earth and the middle-sea was established in Europe.

Astrophotography is always a travel back in time, in this peculiar case, it is only a short trip…


Galaxie M63 – 9″ TMB Apo April 07

Messier 63 aka “Sunflower-galaxy” is located in the constellation “Canes Venatices” in the northern hemisphere. Discovered by Pierre Mechain in 1779 (the same year when the “Black-eye-galaxy M64, M 58,59,60 and 61 were discovered) it is considerabley large, appearing at about 12.6 by 7.2 arc minutes, which yield about 100.000 lightyears across, respectfully. M63 can therefor be spotted in a standard amateur telescope, even in a good bino, she should make a significant “blob” in the field, as it has a very bright core. However, shining at about 8m5 it is definitely out of reach for bare eye visualisation; 27 Million lightyears is just too far away.

When looking at the full-size version, you might find the very center of the galaxy significantly yellowish in a distinctl area. This color originates in the presence of very old stars, dwelling quite close to the center. Not many galaxies show this color-distinction so dramatically as the “sunflower” does. Having an image of the sun in our mind, we understand, the name “sunflower” was perfectly chosen for her – even though the color has been viewed the first time way later, after the galaxy’s name was given.

Interestingly enough, in near infrared investigations a completely different image of this beautyful spiral-galaxy is revelaed. In lower frequency of the spectrum we can only see 2 major spirals, and no mind, who’s conception of the world was based upon IR-eyes would ever think of taging M63 “sunflower”.


Galaxie NGC 4490 + NGC 4485 – 9″ TMB Apo f/9 Feb. 2008

Discovered by W. Herschel on 14th of Jan 1788 in the constellation of Canes Venatices this pair of galaxies are interacting in a gravitational way. Originally spiral shaped both partners pertubate their physical appearence dramatcially so the original spiral structure can only be guessed in the smaller NGC 4485 which as a consequence of the gravitational influence over the past million years has lost it’s spiral structure and is now categorized as an irregular shaped galaxy.

Being 10m2 bright, NGC 4490 measures 10.6 by 3.2 arc minutes, while NGC 4485 shines at 12m3 and holds only 2.4 by 1.8 arc minutes. Located some 26 Mio LY away from Earth both galaxies move away from each other being separated by some 25000 Lightyears at this time.

Whenever galaxies collide or in this case, gravitationally interfer with each other, Hydrogen gas masses are being shared and merged, causing star forming/burst regions. One of these larger star forming areas that measure around 1 Mio solar masses can be found in the south-east tail of of NGC 4490 being approximalty 200 Mio years old. Further star burst regions are visible in this image inbetween the two galaxies.

Most recently a Supernova took place in that galaxy: SN 2008 ax. It was first discovered by a Japanese Amateur Astronomer! Rick Johnson imaged the SN with his 14″ LX200R, L=4×10′, RGB=1×10′, STL-11000XM, Paramount ME. SN 2008 AX was visible for about 3 to 6 months – depending on the scope you used…(-: Torsten Grossmann imaged the galaxies again in early 2010 and we could no longer find any hint of the SN – which of course was to be expected. Nevertheless, within NGC4490 a remnant of that star that has gone supernova is still present and renders potential material for new stars that are yet to come.