An optical and X-ray survey of s-type Markarian galaxies.
Abstract
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.
- Publication:
-
The Astronomical Journal
- Pub Date:
- November 1981
- DOI:
- 10.1086/113042
- Bibcode:
- 1981AJ.....86.1585H
- Keywords:
-
- 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;
- Astronomy;
- Markarian Galaxies:UBV Photometry;
- Markarian Galaxies:X Rays