Bibcode
DOI
Pastoriza, M. G.; Bica, E.; Bonatto, Ch.; Mediavilla, E.; Perez, E.
Bibliographical reference
Astronomical Journal (ISSN 0004-6256), vol. 102, Nov. 1991, p. 1696-1701. Research supported by CNPq of Brazil.
Advertised on:
11
1991
Citations
1
Refereed citations
1
Description
Markarian 50 is analyzed using V and I CCD frames and IPCS and CCD
spectra, obtained in June 1985, covering the range 3200-10,000 A. It is
inferred from the surface brightness profiles derived from the images
that this is an early-type, elliptical, or S0 galaxy, which is supported
by the spectral analysis of the stellar population. After subtraction of
the stellar population, the emission properties of the Seyfert 1 nucleus
are studied. In the low state, a strong broad H-alpha with an FWHM of
4500 km/s is detected, whereas H-beta is stronger than O III 5007 by a
factor of about 2 (in flux). The stellar population fractions in the
high-state continuum are 48 percent at 3800 A, 71 percent at 5000 A, and
82 percent at 8900 A. Permitted Fe emission has similar intensities in
the high and low states, showing that its formation zone does not
coincide with that of the broad H I and He I lines, i.e., it is farther
than five light-years from the central source.