Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...297...13h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 297, no. 1, p. 13-27
Astronomy and Astrophysics
Astrophysics
37
Astronomical Spectroscopy, Cooling Flows (Astrophysics), Cosmic Dust, Interstellar Matter, Radio Astronomy, Radio Galaxies, Star Formation, Ultraviolet Astronomy, Absorption Spectra, Astronomical Photometry, Charge Coupled Devices, Emission Spectra, Iue, X Rays
Scientific paper
Optical images and spectroscopy are presented for the radio galaxy Hydra A which contains a substantial flow of cooling X-ray gas. A young stellar population is observed as an excess light aroung the center showing blue color and Balmer lines in absorption. The same area also exhibits strong optical emission lines. Our IUE spectra show Ly alpha and an ultraviolet continuum. The optical luminosity and color of the excess light, the presence of Balmer absorption lines, and the UV continuum flux are compatible with a burst of recent star formation of an age approximately equal to 107 yr, total mass 108 - 109 solar mass, and an initial mass function including OB stars. We argue that the young stars and the emission-line gas most likely are products of the cooling flow. This is apparently contridicted by the unexpected presence of a significant amount of dust in Hydra A. The dust is inferred form a substantial far-infrared flux which rivals the X-ray emission in cooling the hot gas. We argue for the hypothesis that the dust is produced in connection with star formation in the cooling flow.
Hansen Leif
Jorgensen Henning E.
Norgaard-Nielsen Hans Ulrik
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