The Local Volume HI Survey (LVHIS)

IC 4662

IC 4662 (HIPASS J1747-64) is a barred Magellanic irregular galaxy at a TRGB distance of 2.44 ± 0.19 Mpc (Karachentsev et al. 2006). Our ATCA HI data reveal extented emission and a rather peculiar velocity field. The HI emission is brightest in the galaxy centre and along the direction of the optical minor axis. At large radii the HI envelope becomes nearly circular with a faint HI extension towards the east. Apart from irregular motions in and near the eastern extension, the HI velocity field clearly indicates rotation. The twisted iso-velocity contours highlight the disturbed nature of the kinematics in the outer disc. Van Eymeren et al. (2010) measure a total HI extent of 15.0 arcmin × 11.5 arcmin, six times larger than the bright stellar body. Their deep Hα images reveal a diffuse filamentary structure surrounding the box-shaped body of IC 4662 plus a detached HII region (a companion galaxy ?) 1.5 arcmin towards the south-east (see also Kaisin et al. 2007). Surprisingly, IC 4662 appears to be a rather isolated galaxy, with no known neighbours within 5 degr. Its disturbed appearance, partly due to the bar and gas outflows, could be caused by accretion of or merging with close companions. For a more detailed discussion of IC 4662 and comparison with other dwarf irregular galaxies see Janine van Eymeren's PhD Thesis (2008) and van Eymeren et al. (2009a,b,c,d).

Reference: Koribalski et al. 2018 * LVHIS database * LVHIS homepage * next

Last updated on 18 Feb 2018. © Copyright CSIRO