NGC 2915 (HIPASS J0926-76)
is a rather isolated BCD galaxy at a TRGB distance of 3.78 ±
0.43 Mpc (Karachentsev et al. 2003), much studied in HI by Meurer et al.
(1996) and more recently Elson et al. (2010). No neighbouring galaxies are
known within 5 degr. The HI cloud HIPASS J0851-75 (vsys = 482 km/s)
west of NGC 2915 appears to be the highest velocity cloud complex near the
start of the Magellanic Leading Arm. Our ATCA maps of NGC 2915 show an enormous
HI disc − compared to the compact stellar body − with a mostly
regular rotation pattern. Meurer et al. (1996) measured an HI extent of ~20
arcmin, i.e., 5× its Holmberg radius. They note a short central bar and
extended spiral arms. We measure FHI = 108.7 Jy km/s, in agreement
with HIPASS (Koribalski et al. 2004), and derive MHI = 3.7 ×
108 M☉. For recent HI studies of NGC 2915 see Elson
et al. (2010, 2011a,b), who improve on previous ATCA HI results by Meurer et
al. (1998, 1996) and Bureau et al. (1999). Elson et al. (2012) also investigate
the star formation in NGC 1705 and NGC 2915.
Reference:
Koribalski et al. 2018
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