UGCA 438
UGCA 438 (HIPASS J2326-32)
is a dwarf irregular galaxy at a TRGB distances of 2.18
± 0.09 Mpc (Dalcanton et al. 2009). The results of stellar photometry,
made difficult by a bright foreground star, are presented by Lee & Byun (1999).
Kaisin et al. (2007) spot a single Hα emission region, while the GALEX
UV emission is clearly extended. Buyle et al. (2006) report CO
non-detections for both UGCA 438 and IC 5152 and show preliminary ATCA HI
intensity maps. Here we show - for comparison with ESO 410-G005 -
high-resolution (30 arcsec) ATCA HI distributions of both galaxies overlaid
on to DSS2 B-band optical images. The HI gas associated with
UGCA 438 is mostly found outside the stellar disc, with HI peaks to the
north and south plus a minor peak to the east. The gas distribution is highly
peculiar and gives the appearance of a fragmented HI ring; the HI velocity
field shows no clear signs of rotation. HI emission is detected in the
velocity range from ~46 to 80 km/s. Using our ATCA HI data we measure
FHI = 3.7 Jy km/s which corresponds to an HI mass of only 4.1 ×
106 M☉. We note that in HIPASS the galaxy UGCA 438
is confused with Galactic HI emission.
Reference:
Koribalski et al. 2018
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