UGC 12732: A Disk Galaxy Lacking High-Velocity Clouds

Details UGC 12732: A Disk Galaxy Lacking High-Velocity Clouds UGC 12732: A Disk Galaxy Lacking High-Velocity Clouds

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....113.1559s&link_type=abstract

Astronomical Journal v.113, p. 1559-1568 (1997)

Astronomy and Astrophysics

Astronomy

9

Scientific paper

We used the Very Large Array to obtain high-sensitivity 21 cm synthesis images of the disk galaxy UGC 12732. This object did not show high-velocity wings in Arecibo telescope spectra obtained to search for populations of high-velocity clouds in external galaxies. The VLA observations confirm the absence of high-velocity H i in UGC 12732: we set an upper limit of 2x10(7) M_sun for high-velocity material, consistent with the upper limit of 5x10(7) M_sun inferred from the Arecibo observations. The gas distribution perpendicular to the disk is successfully represented by a thin layer with a constant Gaussian velocity dispersion of sigma_v = 9 km s(-1) . UGC 12732 has a low star formation rate, which is consistent with previous findings that galaxies without active star formation lack high-velocity H i clouds.

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