Arp 142

Galaxie
Arp 142
{{{Kartentext}}}
Aufnahme der WFC3 des Hubble-Weltraumteleskops
AladinLite
Sternbild Wasserschlange
Position
ÄquinoktiumJ2000.0, Epoche: J2000.0
Rektaszension 09h 37m 44,5s[1][2]
Deklination +02° 45′ 15″[1][2]
Erscheinungsbild
Morphologischer Typ I pec? (NGC 2936)
E (NGC 2937)[3][4]
Helligkeit (visuell) 12,9 (NGC 2936)
13,6 (NGC 2937) mag[3][4]
Helligkeit (B-Band) 13,9 (NGC 2936)
14,6 (NGC 2937) mag[3][4]
Winkel­ausdehnung 1,3' × 0,5' (NGC 2936)
0,8' × 0,6' (NGC 2937)[3][4]
Positionswinkel 35° (NGC 2936)
0° (NGC 2937)[3][4]
Inklination °
Flächen­helligkeit 12,5 (NGC 2936)
12,9 (NGC 2937) mag/arcmin²[3][4]
Physikalische Daten
Zugehörigkeit
Rotverschiebung 0.023557 ± 0.000009[1]
0.022647 ± 0.000009[2]
Radial­geschwin­digkeit (7062 ± 3)[1]
(6789 ± 3)[2] km/s
Hubbledistanz
H0 = 73 km/(s • Mpc)
(303 ± 21) 𐄁 106 Lj
(92,9 ± 6,5) Mpc [1]
Absolute Helligkeit mag
Masse M
Durchmesser 130.000 + 65.000 Lj[5][6]
Metallizität [Fe/H] {{{Metallizität}}}
Geschichte
Entdeckung Albert Marth
Entdeckungsdatum 3. März 1864[7]
Katalogbezeichnungen
NGC 2936/7 • UGC 5130/1 • PGC 27422/3 • CGCG 035-015 • MCG +01-25-5/6 • Arp 142 • VV 316 •

Arp 142 (VV 316) ist ein verschmelzendes Galaxienpaar im Sternbild Hydra, welche etwa 300 Millionen Lichtjahre von der Milchstraße entfernt ist. Es besteht aus einer irregulären Galaxie, NGC 2936, und einer elliptischen Galaxie, NGC 2937. Erstere ist sehr stark verformt und besitzt weitläufige Gezeitenarme, die mehrere Sternentstehungsgebiete beinhalten. Im Visuellen und nahen Infrarot entspricht das Erscheinungsbild von NGC 2936 dem Kopf eines Vogels mit ihrem Kern als Auge und den Gezeitenarmen als Nacken. Die Erscheinung des Systems weist gewisse Ähnlichkeiten zu Arp 125 auf.[8] Halton Arp gliederte seinen Katalog ungewöhnlicher Galaxien nach rein morphologischen Kriterien in Gruppen. Diese Galaxie gehört zu der Klasse Elliptischer Galaxien mit ausströmenden Material.

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

Einzelnachweise

  1. a b c d NASA/IPAC EXTRAGALACTIC DATABASE NGC 2936
  2. a b c NASA/IPAC EXTRAGALACTIC DATABASE NGC 2937
  3. a b c d e f SEDS: NGC 2936
  4. a b c d e f SEDS: NGC 2937
  5. NASA/IPAC_NGC 2936
  6. NASA/IPAC_NGC 2937
  7. Seligman
  8. beispielsweise Sergio A. Cellone, Juan Carlos Forte: The Peculiar Morphology of the Irregular Galaxy NGC 1427A. In: The Astrophysical Journal. (ApJ) April 1997, Band 113, Nr. 4, S. 1248, doi:10.1086/118339, Volltext online.

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