Discovery of a giant H i tail in the galaxy group HCG 44 - Université de Lyon
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2013

Discovery of a giant H i tail in the galaxy group HCG 44

Bärbel Koribalski
  • Function : Author
Richard M. Mcdermid
  • Function : Author
Leo Michel-Dansac
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Katherine Alatalo
  • Function : Author
Leo Blitz
  • Function : Author
Michele Cappellari
Alison F. Crocker
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Timothy A. Davis
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P. T. de Zeeuw
  • Function : Author
Sadegh Khochfar
  • Function : Author
Davor Krajnović
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Harald Kuntschner
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Thorsten Naab
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Marc Sarzi
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Nicholas Scott
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Anne-Marie Weijmans
  • Function : Author
Lisa M. Young
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Abstract

We report the discovery of a giant H i tail in the intragroup medium of HCG 44 as part of the ATLAS3D survey. The tail is ˜ 300 kpc long in projection and contains ˜ 5 × 108 M&sun; of H i. We detect no diffuse stellar light at the location of the tail down to ˜ 28.5 mag arcsec- 2 in g band. We speculate that the tail might have formed as gas was stripped from the outer regions of NGC 3187 (a member of HCG 44) by the group tidal field. In this case, a simple model indicates that about 1/3 of the galaxy's H i was stripped during a time interval of < 1 Gyr. Alternatively, the tail may be the remnant of an interaction between HCG 44 and NGC 3162, a spiral galaxy now ˜ 650 kpc away from the group. Regardless of the precise formation mechanism, the detected H i tail shows for the first time direct evidence of gas stripping in HCG 44. It also highlights that deep H i observations over a large field are needed to gather a complete census of this kind of events in the local Universe.
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hal-00765957 , version 1 (05-01-2025)

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Paolo Serra, Bärbel Koribalski, Pierre-Alain Duc, Tom Oosterloo, Richard M. Mcdermid, et al.. Discovery of a giant H i tail in the galaxy group HCG 44. Monthly Notices of the Royal Astronomical Society, 2013, 428, pp.370-380. ⟨10.1093/MNRAS/STS033⟩. ⟨hal-00765957⟩
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