Optical and 21 CM Observations of the Warped, Edge-On Galaxy UGC 7170

Details Optical and 21 CM Observations of the Warped, Edge-On Galaxy UGC 7170 Optical and 21 CM Observations of the Warped, Edge-On Galaxy UGC 7170

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....111.1505c&link_type=abstract

Astronomical Journal v.111, p.1505

Astronomy and Astrophysics

Astronomy

12

Radio Lines: Galaxies, Galaxies: Individual: Ugc 7170, Galaxies: Spiral

Scientific paper

Aperture synthesis observations in the 21 cm line of H I are presented for UGC 7170, an edge-on disk galaxy with an optical warp. For a derived distance of 31.8 Mpc, we find an HI mass of 4.5 x 10^9^ M_sun_. The HI gas does not extend much beyond the stellar light, reaching only to about three exponential scale lengths of the stellar disk. The ratio of the H I mass to the dynamical mass is normal for a late-type spiral, but the mass-to-light ratio is high, M_dyn_/L_B_ = 43 in solar units, indicating that most of the mass is in a dark halo. Since we observe the rotation curve to flatten at about 1.3 scale lengths of the optical disk, the core radius of the dark halo must be comparable to the disk scale length. UGC 7170 has an asymmetric warp that bends more strongly on the southern side than on the northern side of the galaxy. This warp is evident at both optical and 21 cm wavelengths, and the similarities of the stellar and gaseous warps are consistent with a gravitational origin for the warp. The relatively small size of the halo core makes it possible to explain the warp as a gravitational bending mode of the galactic disk, if the dark halo is assumed to be slightly flattened.

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