Luminosity-Linear Size Relation for Galaxies and Quasars With Steep Radio Spectrum

Abstract

Our data for sources with steep radio spectrum, detected with radio telescope UTR-2 at the decametre band give evidence on the great luminosities, linear sizes, characteristic ages of these objects. In connection with such peculiarities, we examine the luminosity-linear size relation of galaxies and quasars with steep radio spectrum at the decametre band. It turned out, that this relation has similar trends for considered radio sources with linear steep spectrum and break steep spectrum. Also we presented the luminosity ratio-linear size relation at different frequency ranges. We discuss the obtained evolution relations for galaxies and quasars with steep low-frequency radio spectrum.

Evolution Features of Giant Sources With Linear and Break Steep Radio Spectra

“…As a result, at the frequencies 1 = 10 MHz and 2 = 80 MHz we obtain from (1) the estimation of synchrotron decay times at transient injection tSTI ~ 10 8 years (at the typical magnetic field strength B (Miroshnichenko, 2012) of examined sources B ~ 10 -5 Gauss). This estimate is near to value of characteristic age t (Miroshnichenko, 2013) for considered sources. So, the low frequency steep spectra of radio sources correspond to long evolution of these objects.…”

“…Galaxies and quasars with break steep spectrum (GC + , QC + ) have characteristic age t by one order greater than it for galaxies and quasars with S steep spectrum (GS, QS). Mean values of characteristic age (Miroshnichenko, 2013, Miroshnichenko, 2016a for Relation of ratio of emission of radio lobes and accretion disk crown versus characteristic age of sources for examined galaxies and quasars (Figure 7, Figure 8) has form similar to relation Figure 5, Figure 6).…”

“…When study of radio sources with steep low-frequency spectra from the UTR-2 catalogue we have determined that all these objects have giant structure (~ Mpc) (Miroshnichenko, 2012). Our estimates of characteristic age of galaxies and quasars with steep spectrum from the UTR-2 catalogue have values 10 7 -10 8 years (Miroshnichenko, 2013). At these great time scales the steep radio spectra of sources may be formed at the transient injection of relativistic electrons by their long synchrotron losses (Kardashev, 1962).…”

“…Galaxies and quasars with break steep spectrum (GC + , QC + ) have characteristic age t by one order greater than it for galaxies and quasars with S steep spectrum (GS, QS). Mean values of characteristic age (Miroshnichenko, 2013, Miroshnichenko, 2016a for objects of our sample are:…”

“…The jet propagation velocity of source Vj (Miroshnichenko, 2016a) is determined from our estimates of linear size of radio structure R (Miroshnichenko, 2012) and characteristic age of source t (Miroshnichenko, 2013) as…”