The complex H-alpha velocity field of NGC 1569

Details The complex H-alpha velocity field of NGC 1569 The complex H-alpha velocity field of NGC 1569

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46..335t&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 4, p. 335-341

Astronomy and Astrophysics

Astronomy

26

Dwarf Galaxies, H Alpha Line, H Ii Regions, Irregular Galaxies, Star Formation, Velocity Distribution, Astronomical Spectroscopy, Bubbles, Charge Coupled Devices, H I Regions, Reflecting Telescopes

Scientific paper

We obtained an H-alpha velocity field for the entire optical region of NGC 1569, a very actively star-forming dwarf irregular galaxy. The H-alpha velocities have two components with separations of several tens to one hundred km/s at about one-fourth of the observed positions, and show bumpy features over the entire region. We suggest that these features are due to expanding bubbles. Kinematically, the peculiar 'H-alpha arm' feature is also part of a large-scale expanding bubble. We discuss some possible triggering mechanisms for the current star formation in NGC 1569.

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