NGC 3628

Galaxie
NGC 3628
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Aufnahme mithilfe des Víctor M. Blanco Telescope
AladinLite
SternbildLöwe
Position
ÄquinoktiumJ2000.0, Epoche: J2000.0
Rektaszension11h 20m 16,970s[1]
Deklination+13° 35′ 22,86″[1]
Erscheinungsbild
Morphologischer TypSAb / HII / LINER[1]
Helligkeit (visuell)9,6 mag[2]
Helligkeit (B-Band)10,4 mag[2]
Winkel­ausdehnung13,1′ × 3,1′[2]
Positionswinkel104°[2]
Flächen­helligkeit13,5 mag/arcmin²[2]
Physikalische Daten
ZugehörigkeitM66-Gruppe (Leo-Triplett)
NGC 3627-Gruppe (LGG 231)[1][3]
Rotverschiebung0.002812 ± 0.000003[1]
Radial­geschwin­digkeit(+843 ± 1) km/s[1]
Hubbledistanz
H0 = 73 km/(s • Mpc)
(34 ± 2) · 106 Lj
(10,4 ± 0,7) Mpc [1]
Durchmesser120 000 Lj
Geschichte
EntdeckungWilhelm Herschel
Entdeckungsdatum8. April 1784
Katalogbezeichnungen
NGC 3628 • UGC 6350 • PGC 34697 • CGCG 067-058 • MCG +02-29-020 • IRAS 11176+1351 • 2MASX J11201701+1335221 • Arp 317 • VV 308b • GC 2378 • H V 8 • h 859 • HIPASS J1120+13b • Holm 246C

NGC 3628 ist eine aktive Spiralgalaxie mit ausgedehnten Sternentstehungsgebieten vom Hubble-Typ Sc im Sternbild Löwe auf der Ekliptik. Sie hat eine scheinbare visuelle Helligkeit von 9,5 mag. Die Galaxie ist schätzungsweise 34 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 145.000 Lichtjahren. Bei dem Objekt handelt es sich um eine sogenannte Edge-On-Galaxie, d. h. wir sehen sie genau in Kantenstellung. Die Spiralarme erscheinen hier nur als dunkle staubhaltige Wolken, beleuchtet vom hellen Zentrum der Galaxie.

Das Objekt wurde am 8. April 1784 von dem deutsch-britischen Astronomen Wilhelm Herschel entdeckt.[4]

Zusammen mit Messier 66 und Messier 65 bildet diese Galaxie das Leo-Triplett auch als Arp 317 oder Holm 246 bekannt, den Kern der M66-Galaxiengruppe. Halton Arp gliederte seinen Katalog ungewöhnlicher Galaxien nach rein morphologischen Kriterien in Gruppen. Dieses Galaxientriplett gehört zu der Klasse Gruppen von Galaxien. Auf länger belichteten Aufnahmen ist ein Gezeitenschweif zu sehen, der von der Galaxie ausgeht. Wahrscheinlich entstand er durch die Wechselwirkungen mit den Gravitationsfeldern der beiden Nachbargalaxien M 65 und M 66. Aufnahmen des Very Large Telescope aus dem Jahr 2010 zeigten zudem eine nahegelegene diffuse Satellitengalaxie[5] und in dem Gezeitenschweif wurde im Jahr 2014 die Ultra Compact Dwarf Galaxy NGC 3628-UCD1 entdeckt.[6][7]

Literatur

  • Jeff Kanipe und Dennis Webb: The Arp Atlas of Peculiar Galaxies – A Chronicle and Observer´s Guide, Richmond 2006, ISBN 978-0-943396-76-7
  • König, Michael & Binnewies, Stefan (2019): Bildatlas der Galaxien: Die Astrophysik hinter den Astrofotografien, Stuttgart: Kosmos, S. 367

Weblinks

Einzelnachweise

  1. a b c d e NASA/IPAC EXTRAGALACTIC DATABASE
  2. a b c d e SEDS: NGC 3628
  3. VizieR
  4. Seligman
  5. a b https://www.eso.org/public/germany/images/potw1026a/
  6. https://iopscience.iop.org/article/10.1088/2041-8205/812/1/L10/pdf
  7. https://arxiv.org/pdf/2001.05746.pdf

Auf dieser Seite verwendete Medien

NGC 3628 and an example of an ultra-compact dwarf galaxy (annotated) (noirlab2330d).jpg
Autor/Urheber: CTIO/NOIRLab/DOE/NSF/AURA Image processing: T.A. Rector (University of Alaska Anchorage/NSF’s NOIRLab), M. Zamani (NSF’s NOIRLab), & D. de Martin (NSF’s NOIRLab), Lizenz: CC BY 4.0
NGC 3628, sometimes nicknamed the Hamburger Galaxy or Sarah's Galaxy, is an unbarred spiral galaxy about 35 million light-years away in the constellation Leo. Extending to the left of NGC 3628 for around 300,000 light-years is a ‘tidal tail’ — an elongated region of stars that arises as a result of gravitational interaction with another galaxy. Embedded within this tidal tail is the ultra-compact dwarf galaxy known as NGC 3628-UCD1.This image was captured by the US Department of Energy’s (DOE) Dark Energy Camera mounted on the National Science Foundation’s (NSF) Víctor M. Blanco 4-meter Telescope at Cerro Tololo Inter-American Observatory in Chile, a Program of NSF’s NOIRLab. NGC 3628 was not part of the survey of the Virgo Cluster.
VST's view of the Leo Triplet and beyond.jpg
Autor/Urheber: ESO/INAF-VST/OmegaCAM. Acknowledgement: OmegaCen/Astro-WISE/Kapteyn Institute, Lizenz: CC BY 3.0
Triplet of bright galaxies in the constellation of Leo (The Lion), together with a multitude of fainter objects: distant background galaxies and much closer Milky Way stars. The image hints at the power of the VST and OmegaCAM for surveying the extragalactic Universe and for mapping the low brightness objects of the galactic halo. This image is a composite created by combining exposures taken through three different filters. Light that passed through a near-infrared filter was coloured red, light in the red part of the spectrum is coloured green, and green light is coloured magenta.
NGC 3628 The Oddest Member of the Leo Triplet.jpg
Autor/Urheber: ESO, Lizenz: CC BY 3.0
NGC 3628 is a spiral galaxy and a member of a small, but conspicuous group of galaxies located about 35 million light-years away, toward the constellation of Leo (the Lion). The other distinguished members of this family, known collectively as the Leo Triplet, are two well-known prominent spiral galaxies, Messier 65 and Messier 66 (not seen on the image), which were both discovered in 1780 by famous French comet hunter Charles Messier. NGC 3628 is the faintest of the trio and escaped Messier’s observations with his rather small telescope. It was discovered and catalogued by William Herschel only four years later.

NGC 3628 hides its spiral structure because it is seen perfectly edge-on, exactly as we observe the Milky Way on a clear night. Its most distinctive feature is a dark band of dust that lies across the plane of the disc and which is visibly distorted outwards, as a consequence of the gravitational interaction between NGC 3628 and its bullying companions. This boxy or “peanut-shaped” bulge, seen as a faint X-shape, is formed mainly of young stars and gas and dust, which create the bulge away from the plane of the rest of the galaxy through their powerful motions. Because of its appearance, NGC 3628 was catalogued as Arp 317 in the Atlas of Peculiar Galaxies, published in 1966, which aimed to characterise a large sample of odd objects that fell outside the standard Hubble classification, to aid understanding of how galaxies evolve.

The depth of the image reveals a myriad of galaxies of different shapes and colours, some of which lie much further away than NGC 3628. Particularly noticeable is the fuzzy blob just in the centre of the image, which is a diffuse satellite galaxy. A number of globular clusters can be seen as fuzzy reddish spots in the halo of the galaxy. Also visible as bright spots near the lower edge of the image (the two blue star-like objects below the satellite galaxy) are two quasars, the central engines of distant and very energetic galaxies, billions of light-years away.

This image has been taken with the FORS2 instrument, attached to one of the ESO Very Large Telescope’s Unit Telescopes. It is a combination of exposures taken through different filters (B, V and R), for a total exposure time of just below one hour. The field of view is about 7 arcminutes across, which is why this large galaxy does not fit into the image.
NGC 3628 and an example of an ultra-compact dwarf galaxy (no annotations) (noirlab2330c).jpg
Autor/Urheber: CTIO/NOIRLab/DOE/NSF/AURA Image processing: T.A. Rector (University of Alaska Anchorage/NSF’s NOIRLab), M. Zamani (NSF’s NOIRLab), & D. de Martin (NSF’s NOIRLab), Lizenz: CC BY 4.0
NGC 3628, sometimes nicknamed the Hamburger Galaxy or Sarah's Galaxy, is an unbarred spiral galaxy about 35 million light-years away in the constellation Leo. Extending to the left of NGC 3628 for around 300,000 light-years is a ‘tidal tail’ — an elongated region of stars that arises as a result of gravitational interaction with another galaxy. Embedded within this tidal tail is the ultra-compact dwarf galaxy known as NGC 3628-UCD1.This image was captured by the US Department of Energy’s (DOE) Dark Energy Camera mounted on the National Science Foundation’s (NSF) Víctor M. Blanco 4-meter Telescope at Cerro Tololo Inter-American Observatory in Chile, a Program of NSF’s NOIRLab. NGC 3628 was not part of the survey of the Virgo Cluster.