Distribution and kinematics of HI gas in the Virgo cluster galaxies NGC 4318 and VCC 566.
Abstract
A region of the Virgo cluster centered on the elliptical galaxy NGC 4318 was mapped in the 21-cm H I line at Westerbork with a resolution of 13" x 95", and with the 4' x 22' beam of the Nancay radiotelescope, following a dubious detection of H I emission at Arecibo (Lake and Schommer, 1984) at a radial velocity 150 km s^-1^ higher than its optical velocity. We found no H I associated with NGC 4318, which appears to be a small gas-poor (M_H I_/L_B_ < 0.01 M_sun_/L_sun_) elliptical. The Arecibo "detection" was apparently caused by a sidelobe of the telescope which picked up H I emission of the nearby gas-rich dwarf galaxy VCC 566. All H I detected at Westerbork is concentrated in VCC 566 and no sign of interaction is apparent between the elliptical and the dwarf galaxy.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- October 1988
- Bibcode:
- 1988A&A...205...47V
- Keywords:
-
- Dwarf Galaxies;
- Elliptical Galaxies;
- Gas Dynamics;
- H I Regions;
- Interstellar Gas;
- Virgo Galactic Cluster;
- Galactic Mass;
- Irregular Galaxies;
- Radial Velocity;
- Radio Telescopes;
- Astrophysics