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|Pairing properties of Markarian starburst Galaxies|
The environmental parameters of 516 non-Seyfert Markarian galaxies werestudied in a redshift-bounded sample, supplemented by new spectra andredshift measures for possible companions, in order to evaluate theiroccurrence in galaxy pairs, defined through quantitative criteria. Itwas found that one-third of these galaxies occur in pairs (while only 6to 10 percent of optically-selected galaxies are known to be paired). Acomparison of various optical and IR properties of paired and nonpairedMarkarian galaxies showed no differences in the shape of the optical,far-IR, or H-alpha luminosity functions. It was found, however, that theMarkarian component is brighter than the other galaxy in each pair by0.66 magnitude in the mean at B.
|Far-infrared properties of Markarian galaxies with multiple nuclei - Warm dust emission in mergers|
An investigation of coadded IRAS data is performed on 187 Markariangalaxies where distinguishing morphological characteristics or multipleoptical nuclei are present. The far-IR properties of Markarian galaxiesare compared to the IRAS Bright Galaxy Sample, and a much higher mediandust temperature is found in the multiple nucleus galaxies, suggestingthat more far-IR luminosity results from active star formation. Bothoptical/UV and far-IR selection techniques are necessary to extractcomplete samples of AGNs since the far-IR two-color plane can miss up to50 percent of the galaxies. A systematic increase in the contribution ofwarm dust emission due to active star formation and AGNs is found in astatistical comparison of merger candidates and other galaxy samples.The assumed nature of precursor galaxies determines the assumedenhancement of far-IR luminosity caused by galaxy collisions. A model ispresented which describes the properties of the Markarian galaxies interms of enhanced OB star formation and different grain sizedistributions. The results of the investigation are shown to beconsistent with a 'subdued' interpretation of merging galaxies with highluminosities.
|A catalog of Markarian galaxies|
A catalog of Markarian galaxies is presented which tabulates redshifts,spectral and morphological classifications, magnitudes, infrared andradio flux densities, and over 600 references to available datapublished before January 1, 1986. Redshifts are now available for 1228objects with strong ultraviolet continua, and follow-up spectroscopicand photometric observations of Markarian galaxies have providedclassifications of 115 Seyfert 1, 43 Seyfert 2, and 137 starburst and HII-type galaxies. After a description of the Markarian survey and thecurrent catalog, a summary of the general results obtained from the datais presented. A preliminary study of the infrared properties ofMarkarian galaxies as measured by IRAS reveals a number of interestingresults, including the existence of a sample of elliptical andlenticular galaxies with appreciable infrared emission.
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