Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...240...70n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 240, no. 1, Dec. 1990, p. 70-77. Research supported by Rumudvalget.
Astronomy and Astrophysics
Astrophysics
13
Elliptical Galaxies, Iue, Seyfert Galaxies, Star Formation Rate, Stellar Mass Accretion, Continuous Spectra, Emission Spectra, Lyman Alpha Radiation, Starburst Galaxies, Ultraviolet Spectra
Scientific paper
Ly-alpha emission and a UV continuum have been detected in NGC 1275, probably from low-velocity (LV) system in the galaxy. Assuming galactic IMFs, it is found that the UV continuum is consistent with either a burst of star formation with an age of 20 Myr or less or a continuous star formation rate of about 50 solar masses/yr lasting 100 Myr or less. The constraint from the observations on the formation rate of stars with masses of 2.5 solar or more is 5-15 percent of the mass accretion rate as inferred from X-ray observations. The population of stars responsible for the UV continuum cannot photoionized LV gas and produce the observed H-alpha flux. It is speculated that the line-emitting LV gas is associated with 'H II' atmospheres around the low-mass molecular clouds responsible for the CO emission. The gas is both evaporated from the surface of the molecular clouds and ionized by hot electrons from the X-ray emitting gas.
Hansen Leif
Jorgensen Henning E.
Norgaard-Nielsen Hans Ulrik
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