TY - JOUR
T1 - Discovery of a giant HI tail in the galaxy group HCG 44
AU - Serra, Paolo
AU - Koribalski, Bärbel
AU - Duc, Pierre-Alain
AU - Oosterloo, Tom
AU - McDermid, Richard M.
AU - Michel-Dansac, Leo
AU - Emsellem, Eric
AU - Cuillandre, Jean-Charles
AU - Alatalo, Katherine
AU - Blitz, Leo
AU - Bois, Maxime
AU - Bournaud, Frédéric
AU - Bureau, Martin
AU - Cappellari, Michele
AU - Crocker, Alison F.
AU - Davies, Roger L.
AU - Davis, Timothy A.
AU - de Zeeuw, P. T.
AU - Khochfar, Sadegh
AU - Krajnović, Davor
AU - Kuntschner, Harald
AU - Lablanche, Pierre-Yves
AU - Morganti, Raffaella
AU - Naab, Thorsten
AU - Sarzi, Marc
AU - Scott, Nicholas
AU - Weijmans, Anne-Marie
AU - Young, Lisa M.
PY - 2013/1/1
Y1 - 2013/1/1
N2 - We report the discovery of a giant HI 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⊙ of HI. 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 HI 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 HI
tail shows for the first time direct evidence of gas stripping in HCG
44. It also highlights that deep HI observations over a large field are
needed to gather a complete census of this kind of events in the local
Universe.
AB - We report the discovery of a giant HI 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⊙ of HI. 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 HI 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 HI
tail shows for the first time direct evidence of gas stripping in HCG
44. It also highlights that deep HI observations over a large field are
needed to gather a complete census of this kind of events in the local
Universe.
KW - galaxies: evolution
KW - galaxies: groups: general
KW - galaxies: groups: individual: HCG 44
KW - galaxies: interactions
KW - galaxies: ISM
UR - http://adsabs.harvard.edu/abs/2013MNRAS.428..370S
U2 - 10.1093/mnras/sts033
DO - 10.1093/mnras/sts033
M3 - Article
SN - 0035-8711
VL - 428
SP - 370
EP - 380
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -