ESO 252-IG001
HIPASS J0457-42
is a nearby dwarf irregular galaxy at a Tully-Fisher (TF) distance of
7.2 Mpc (Karachentsev et al. 2013). It is the western galaxy (PA = 56 degr)
of the apparent galaxy pair ESO 252-IG001 (see Koribalski et al. 2004;
their Appendix A).
From the ATCA HI intensity map we measure a position of α,δ(J2000)
= 04:56:59.1, -42:47:58.3. The galaxy was also detected in Hα, where
Meurer et al. (2006) find a curious near linear Hα arc through
centre along the minor axis. Our ATCA data show an extended, regular
rotating HI disc, aligned with optical appearance. We note a small HI extension
or tail on the north-eastern (approaching) side. The optical properties, listed
in Table 2, are of the HI-detected galaxy (ESO 252-IG001 NED01). The eastern,
nearly edge-on galaxy (ESO 252-IG001 NED02, PA ~ 130 degr) is much more distant
and not a companion. The closest neighbour to HIPASS J0457-42, ESO 305-G002
(vopt = 259 km/s) is more than 3 degrees away. If the optical
velocity (da Costa et al. 1991) is correct, ESO 305-G002 would be a nearby
dwarf spiral galaxy at a projected distance of ~200 arcmin. Inspecting HIPASS
data we find HI emission at the position/velocity of ESO 305-G002, but it
is situated close to an HVC complex (Putman et al. 2002). At the position of
05:01:21.8, -39:36:13 we measure Speak = 120 mJy, FHI =
4.3 Jy km/s, w20 = 55 km/s and w50 = 30 km/s.
Reference:
Koribalski et al. 2018
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