New giant HII regions in the southern sky

Details New giant HII regions in the southern sky New giant HII regions in the southern sky

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mnras.356.1357f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 356, Issue 4, pp. 1357-1361.

Astronomy and Astrophysics

Astronomy

11

Hii Regions, Galaxies: Individual: Ngc 2997, Galaxies: Individual: Ngc 7552, Galaxies: Starburst

Scientific paper

We present results of a search for giant HII regions in southern galaxies. Using high-resolution spectra, obtained with the Magellan Inamori Kyocera Echelle (MIKE) at the Las Campanas Magellan II telescope, we were able to resolve the emission-line profiles and determine the intrinsic velocity dispersion of the ionized gas. Out of four observed regions, selected from previous CCD narrow-band photometry, we detected three HII regions showing supersonic velocity dispersion, characteristic of giant HII regions, and their location in diagnostic diagrams suggests that a powerful starburst is the source of ionization energy.

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