Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983afz....19..393b&link_type=abstract
(Astrofizika, vol. 19, July-Sept. 1983, p. 393-402) Astrophysics (ISSN 0571-7132), vol. 19, no. 3, Jan. 1984, p. 215-221. Transl
Astronomy and Astrophysics
Astrophysics
1
Astronomical Spectroscopy, Galactic Nuclei, Galactic Structure, Galactic Rotation, Spectrophotometry, Stellar Evolution
Scientific paper
The results of a detailed spectroscopic and spectrophotometric investigation of the central region of Markarian 201 are presented. The spectrum of the object contains both emission and absorption lines, the first members of the hydrogen Balmer series being in emission and the higher ones in absorption. The emission components of H-gamma and H-delta are shifted relative to their absorption components by about 300 km/s in the short-wave direction. Rigid-body rotation of the galaxy is observed to a distance of five arcsec from the geometrical center of the nucleus. The mean gradient of the angular velocity in this section of the rotation curve is 15.5 + or 1.6 km/s per arcsec. The mass of the region is about two billion solar masses, its effective temperature is about 6700 K, and the electron density is 440 per cu cm. It is concluded that the galaxy has a peculiar nucleus in which intensive star formation is taking place.
Burenkov Alexander N.
Khachikian E. E.
Petrosian Artashes R.
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