A multifrequency radio continuum and IRAS faint source survey of markarian galaxies

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Abstract

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 ν = 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 micron/60 micron color ratio among Seyfert MRKs, and a clear tendency for MRKs with warmer 60 micron/100 micron colors to also possess cooler 12 micron/25 micron 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.

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