Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...305l..25h&link_type=abstract
Astronomy and Astrophysics, v.305, p.L25
Astronomy and Astrophysics
Astrophysics
8
Galaxies: General, Galaxies: Distances And Redshifts, Galaxies: Individual:, (Galaxies): Local Group
Scientific paper
We report 21-cm HI line observations towards the two recently discovered nearby galaxies MB1 and MB2 in Cassiopeia. MB1 was detected, while MB2 was not. The low heliocentric velocity of MB1, 189+/-3km/s, suggests it is a member of the IC 342-Maffei group, and its small line width (60km/s) is in agreement with the optical classification of a late-type spiral (Sd:). Its HI mass (at an assumed distance of 3Mpc) is 2.10^7^Msun_; hence it is HI poor. The low noise of the 21-cm line observation of MB2 yields a 3σ upper limit to its total HI mass of only about ~10^6^Msun_ (assuming a distance of 3Mpc and a linewidth of 100km/s), showing it to be an HI-poor system. A strong Galactic neutral hydrogen signal prevented the detection of a weaker extragalactic profile, though, in the heliocentric radial velocity range of about -155 to 30km/s.
Driel Wim van
Huchtmeier Walter K.
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