Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44l.247k&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 6, p. L247-L251.
Astronomy and Astrophysics
Astronomy
Infrared Astronomy, Markarian Galaxies, Seyfert Galaxies, Spectral Energy Distribution, Star Formation, Galactic Nuclei, Near Infrared Radiation
Scientific paper
The initial results of near-infrared imaging observations with a PtSi camera developed at NAOJ are presented for the central region of a Seyfert type-l galaxy, Mrk 231. The J-, H-, and K-band images show the compact nucleus unresolved; their comparison with model images provides us with upper limits of the brightness of its blue subcomponent relative to the nucleus: Delta J greater than about 7.1, Delta H greater than 4.6, and Delta K greater than 6.5. This strong constraint in the J band, in combination with published data for the U band, suggests that the subcomponent may be a giant star-forming region of M(U) about -18 and about 10 exp 8 solar masses concentrated within a region of about 2 kpc across. In FUV observations of Mrk 231, its flux might be dominated by the emission from this blue object, rather than by that from the heavily obscured nucleus, itself.
Kodaira Keiichi
Ohta Kouji
Ueno Munekata
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