SBS 1147+520 - This HI profile is heavily confused by two bright
galaxies, UGC 6802 (7' N) and NGC 3917 (9.5' NE). SBS 1147+520
(v= 1257 km s^-1^) is confused with UGC 6802 (v= 1253 km s^-1^, the
integrated HI profile extends from 1180 to 1300 km s^-1^), while the
integrated HI profile of NGC 3917 (v= 965 km s^-1^) extends from 830
to 1120 km s^-1^. The Nancay (TLMP) and Effelsberg profiles differ
markedly both in line shape and width. The narrow (EW) but highly
elongated (NS) Nancay beam might be sensitive to UGC 6802 (7'N). Our
profile consists of three main components at velocities 949, 1077, and
1224 km s^-1^. The first two peaks are not at all detected in the
Nancay profile which shows a clear peak around 1200 km s^-1^,
comparable to our third peak. Further, they detect stronger emission
around 1300 km s^-1^, which is barely seen in our profile. Our first
peak (v= 949 km s^-1^) matches in velocity with NGC 3917 (9.5' NE);
this could not be seen with the Nancay beam due to its different shape
and size. Our second peak (v= 1077 km s^-1^) is not seen in the Nancay
profile. It could be associated with the present SBS galaxy (optical
radial velocity is close). Our third HI component could be identified
as the attenuated peak due to UGC 6802, which is seen at a stronger
level in the Nancay observations (Thuan et al. 1999b, TLMP), due to
their highly elongated NS beam.
NGC 3917. NVSS and FIRST did not detect this source. Condon, Yin, &
Burnstein (1987) show an uncertain 2.1 mJy detection at 1.4 GHz, 54"
resolution. The 15 GHz, 4", and 0.2" resolution observations of
Nagar et al. (2000) give an upper limit of 1.2 mJy to any small-scale
Non-interacting pair with NGC 3931 at 11 arcmin
and anonymous spiral at 6 arcmin north-preceding.
Other anonymous ellipticals at 9 arcmin north
and 4.5 arcmin following.
SAcd: (de Vaucouleurs)
See UGC 06802
Companion 4.9, 204, 0.3 x 0.3, diffuse
Small, bright central part. Many knotty, branching arms. Poorly resolved.
Non-interacting pair with NGC 3931 at 11 arcmin.
Non-interacting pair an anonymous small spiral (1.9 arcmin x 0.15 arcmin) at
6 arcmin north-preceding.
NGC 3917A in Ap. J., 82, 74, 1935 is an elliptical galaxy 9 arcmin north and
4.5 arcmin following NGC 3917.