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2007MNRAS.380.1009H - Mon. Not. R. Astron. Soc., 380, 1009-1022 (2007/September-3)
NGC 4438 and its environment at radio wavelengths.
HOTA A., SAIKIA D.J. and IRWIN J.A.
Abstract (from CDS):
The Hi observations show an elongated structure which is displaced by ∼4.1kpc on the western side of NGC 4438 and has a size of ∼9.8 kpc and a mass of 1.8x108M☉. The velocity field suggests systematic rotation, consistent with earlier observations. These observations also detect Hi emission from the disc of the galaxy with a mass of 1.2x108M☉. We detect a faint Hi tail towards the north of NGC 4438 close to a stellar tail seen earlier in deep optical observations. This Hi tail has a total extent of ∼50 kpc and a mass of 1.4x108M☉ if it is at the distance of NGC 4438. The velocity of the Hi tail is ∼ -10 km/s similar to that of Hi emission from IC 3355, but the possibility that the tail could be foreground Galactic emission cannot be ruled out. We discuss the different structures in light of different models which have been suggested for this disturbed galaxy, namely ram pressure stripping, tidal and interstellar medium (ISM)-ISM interactions.
Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s): galaxies: individual: NGC 4438 - galaxies: individual: IC 3355 - galaxies: interactions - galaxies: ISM - galaxies: kinematics and dynamics - galaxies: nuclei
Simbad objects: 15
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