NGC 4449: The Dr. Jekyll/Mr. Hyde of Magellanic Irregular Galaxies

Details NGC 4449: The Dr. Jekyll/Mr. Hyde of Magellanic Irregular Galaxies NGC 4449: The Dr. Jekyll/Mr. Hyde of Magellanic Irregular Galaxies

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.6112w&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #61.12; Bulletin of the American Astronomical Society, Vol. 28, p.925

Astronomy and Astrophysics

Astronomy

1

Scientific paper

NGC 4449 is a nearby galaxy that has long been considered to be representative of normal giant Magellanic irregulars with an unusually large, quiescent disk. We present a VLA mosaic of the extended HI disk around NGC 4449 that shatters this preconception. Our data show NGC 4449 to contain a bright central condensation of gas associated with the optical galaxy. A long stream of gas emanates from the southern end of this condensation and curves 3/4 of the way around the galaxy. We estimate the total length of this arc to be ~ 80 kpc. Additionally, a second streamer emanates from the northern end of the central condensation. While the morphology of the gas suggests that it has been disturbed by an external perturbation, it is dynamically cold and in regular rotation about the center of NGC 4449.

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