H I Imaging of Cassiopeia I

Details H I Imaging of Cassiopeia I H I Imaging of Cassiopeia I

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....120.2038m&link_type=abstract

The Astronomical Journal, Volume 120, Issue 4, pp. 2038-2043.

Astronomy and Astrophysics

Astronomy

1

Galaxies: Individual (Cassiopeia 1)

Scientific paper

We present H I maps of a recently discovered dwarf galaxy near the IC 342 Maffei 1-2 Group, Cassiopeia 1. Our data show that Cas 1 has a total H I mass of 1.5×108 Msolar, assuming a distance of 4.5 Mpc. The highest column density gas forms a ring around a central depression in the H I distribution and the peak of the H I gas is offset from the distribution of starlight. Isovelocity contours indicate that the galaxy is in solid-body rotation; a region of large velocity dispersion is approximately coincident with observed current star formation activity in Cas 1.

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