A MULTIFREQUENCY RADIO-CONTINUUM AND IRAS FAINT SOURCE SURVEY OF MARKARIAN GALAXIES

Results are presented from a multifrequency radio continuum survey of Markarian galaxies (MRKs) and are supplemented by IRAS infrared data from the Faint Source Survey. Radio data are presented for 899 MRKs observed at nu = 4.755 GHz with the NRAO-Green Bank 300 foot(91 m) telescope, including nearly 88% of those objects in Markarian lists VI-XIV. In addition, 1.415 GHz measurements of 258 MRKs, over 30% of the MRKs accessible from NAIC-Arecibo, are reported. Radio continuum observations of smaller numbers of MRKs were made at 10.63 GHz and at 23.1 GHz and are also presented. The ( 1.415 GHz, 4.755 GHz) percentages of ''probable'' detections were found to be (37%, 15%) for the MRK sample as a whole. These detection rates increased to (49%, 33%) among Seyfert MRKs, and to (73%, 42%) for those classified as having starburst nuclei. The vast majority of radio-detected MRKs have radio luminosities h(2)P(1.415) < 10(23) W HZ(-1) characteristic of ''normal galaxies.'' Infrared data from the IRAS Faint Source Survey (Ver. 2) are presented for 944 MRKs, with reasonably secure identifications extracted from the NASA/IPAC Extragalactic Database. MRKs exhibit the same canonical infrared characteristics as those reported for various other galaxy samples, that is, the well-known enhancement of the 25 mu m/60 mu m color ratio among Seyfert MRKs, and a clear tendency for MRKs with warmer 60 mu m/100 mu m colors to also possess cooler 12 mu m/25 mu m colors. In addition, non-Seyfert MRKs are found to obey the well-documented infrared/radio luminosity correlation, with the tightest correlation seen for starburst MRKs. Linear regression fits to the infrared/radio correlations yield these relationships: log L(FIR) = 0.77 log P-1.415 + 19.95 (r = 0.96) and log L(FIR) = 0.89 log P-4.755 + 17.51 (r = 0.90). Mean values of the infrared/radio ratios are consistent with those derived for various optically selected galaxy samples. The FIR/radio ratios for starburst MRKs are enhanced by a factor of 3 over those for Seyfert MRKs. There is no statistically significant difference between the infrared/radio ratios of single-nucleus and multiple-nucleus MRKs, although the analysis is complicated by small sample sizes.