Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86.1585h&link_type=abstract
Astronomical Journal, vol. 86, Nov. 1981, p. 1585-1594.
Astronomy and Astrophysics
Astronomy
11
Astronomical Photometry, Elliptical Galaxies, Light Emission, Markarian Galaxies, X Ray Sources, Broadband, Compact Galaxies, Emission Spectra, Heao 1, Heao 2, Luminous Intensity, Red Shift, Stellar Evolution, Ubv Spectra, Ultraviolet Spectra
Scientific paper
The results of a study of 23 compact, lineless Markarian galaxies using broadband optical photometry and X-ray satellite observations are reported. The photometry shows that the sample can be broken into four groups. In one group (Mrk 180, 421, and 501) are composite objects in which a BL Lacertae object is embedded in an elliptical galaxy. For this group, the results of multiepoch X-ray observations using the HEAO-1 and -2 satellites are presented. In addition, photometry is used to decompose the optical emission into nonthermal and galactic components. In the second group are objects showing a small ultraviolet excess relative to normal galaxies. The X-ray survey indicates that the X-ray luminosity of objects in group 2 is much lower than those in group 1. This suggests that there is an intrinsic difference between objects in groups 1 and 2. The third and fourth groups are objects whose colors are indistinguishable from those of normal field galaxies and those of galactic stars, respectively. No X-ray emission was detected from objects in either of these groups.
Hutter Donald J.
Mufson Stuart Lee
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