Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924410b&link_type=abstract
American Astronomical Society, AAS Meeting #219, #244.10
Astronomy and Astrophysics
Astronomy
Scientific paper
NGC4449 is a Magellanic irregular galaxy with MB -18, roughly twice the luminosity of the LMC and located 3.82 Mpc from the Milky Way. We report the discovery of a new very low surface brightness dwarf companion at a projected distance if 9 kpc from the galaxy. It has a full extent of 3.5 X 7.5 kpc, with the morphology of a compact core and extended tidal tails that are roughly aligned in the direction of NGC 4449. Preliminary estimates find Mr = -13, making this a relatively luminous, yet very large, dwarf galaxy. The structure of NGC4449B is consistent with a dwarf galaxy on its first encounter, undergoing tidal disruption. Despite large amounts of HI in the vicinity, we see no signs of star formation in the dwarf and speculate that its stellar population is old. The extreme tidal structure and low surface brightness, as well as close projected distance, secure the association with NGC 4449.
Black Christine
Longstaff F.
Reitzel David B.
Rich Robert Michael
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