ESO 012-G21
Abstract
R. M. West, European Southern Observatory, commnunicates: "The galaxy ESO 012-G21 (R.A. = 0h39m16s, Decl. = -79o30'.9, equinox 1950.0) was found on the ESO (B) Atlas and described in ESO-Uppsala List No. 6 (Holmberg et al. 1978, A. & Ap. Suppl. 34, 285). Under good seeing it shows a bright starlike nucleus smaller than 1" surrounded by a diffuse, elliptical halo. A spectrum (Las Campanas 2.5-m reflector, reticon spectrograph) shows typical Seyfert 1 emission lines. H-alpha and H-beta are very broad (> 10 nm). The O III lines are very strong, but narrower. Several Fe II lines are present. The redshift z = 0.03. Standard UBV photometry by C. Sterken (Bochum 0.6-m reflector) gave a mean value over three nights of V = 14.5; a variation is not excluded. A deep electrograph in B obtained by P. Grosboel (Danish 1.5-m reflector, 40-mm McMullan camera) shows two diagonally opposite, faint diffuse spiral features, extending 15" on either side of the nucleus. With a Hubble constant of 50 km s**-1 Mpc**-1, Mv = -22 and the size is 25 kpc. It is noted that the position is within 0o.7 of the x-ray source 3U 0055-79 (Giacconi et al. 1974, Ap. J. Suppl. 27, 37). The area was confused in the Ariel 5 survey (Cooke et al. 1978, M.N. 182, 489), and the source is not present in the 4U catalogue (Forman et al. 1978, Ap. J. Suppl. 38, 357). ESO 012-G21 is the most conspicuous extragalactic object around."
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- October 1979
- Bibcode:
- 1979IAUC.3415....1W