Star Formation Rates in Nearby Markarian Galaxies

Abstract

The star formation rates for the 230 nearest Markarian galaxies with radial velocities VLG <3500 km/s have been determined from their far ultraviolet fluxes obtained with the GALEX satellite. We briefly discuss the observed relationship between the star formation rate and other integral parameters of these galaxies: stellar mass, hydrogen mass, morphological type, and activity index. On the average, the Markarian galaxies have reserves of gas that are a factor of two smaller than those of galaxies in the field of the same stellar mass and type. Despite their elevated activity, the specific rate of star formation in the Markarian galaxies, SF R/M * , does not exceed a limit of ∼dex(-9.4) [yr −1 ].

Star formation rates in isolated galaxies selected from the Two-Micron All-Sky Survey

“…We found that the fraction of AGN in paired samples is a little higher (but not significantly in the statistical sense) than in our isolated galaxy sample. We suggest that AGN phenomenon is not necessarily connected with environmental density and, most probably, defined by secular galaxy evolution confirming the previous results by Coziol et al (2011), Hernandez-Ibarra et al (2013, Karachentseva et al (2014) and Pulatova et al (2015).…”

“…In general, we are in agreement with the results obtained in previous works by other authors, see for example Peng et al (2010Peng et al ( , 2012 and Tal et al (2014). Karachentseva et al (2014) studied the SF R of the Markarian galaxies, which are active galaxies with different signs of activity (Markarian et al 1989, Mazzarella & Balzano 1986, Petrosian et al 2007): quasars, Seyfert galaxies, Wolf-Rayet, Starburst and HII galaxies. The authors found that SF R in Markarian galaxies is a little higher than in isolated galaxies, though the SSF R does not exceed a limit of ∼dex(- 9.4) [-yr −1 ], also noted in subsection 3.4 of this paper.…”

“…studied the star formation properties of the LOG galaxies and found that the specific star formation rate (SSF R = SF R/M * ) upper limit does not exceed the value of logSSF R = -9.4 [yr −1 ]. This agrees with the corresponding upper limits for the galaxies from the Local Universe located in different environments (Karachetsev & Kaisina 2013) and for galaxies of different activity types in the Markarian sense (Karachentseva et al 2014).…”

“…Since the stellar population of galaxies has an average mass-to-luminosity ratio in the K-band M/L∼1 (Bell et al 2003, see also Jarrett et al 2013), the stellar masses of galaxies were derived from Ks luminosity. A similar approach was also applied in previous works by Karachentsev, Makarov & Kaisina (2013) , and Karachentseva et al (2014) with which we compare our results 10 . In this work we used the total Ksband magnitudes from 2MASX catalogue, the Ks absolute magnitude of Sun is 3.32 (Jarrett et al 2013).…”