Hard X-ray properties of radio-selected blazars

被引：7

作者：

Langejahn, M. ^{[1
]}

Kadler, M. ^{[1
]}

Wilms, J. ^{[2
,3
]}

Litzinger, E. ^{[1
,2
,3
]}

Kreter, M. ^{[4
]}

Gehrels, N. ^{[5
]}

Baumgartner, W. H. ^{[6
]}

Markwardt, C. B. ^{[5
]}

Tueller, J. ^{[5
]}

机构：

[1] Univ Wurzburg, Lehrstuhl Astron, Emil Fischer Str 31, D-97074 Wurzburg, Germany

[2] Univ Erlangen Nurnberg, Dr Karl Remeis Sternwarte, Sternwartstr 7, D-96049 Bamberg, Germany

[3] Erlangen Ctr Astroparticle Phys, Sternwartstr 7, D-96049 Bamberg, Germany

[4] North West Univ, Ctr Space Res, Private Bag X6001, ZA-2520 Potchefstroom, South Africa

[5] NASA, Goddard Space Flight Ctr, Astrophys Sci Div, Greenbelt, MD 20771 USA

[6] NASA, Marshall Space Flight Ctr, Sci Res Off, Huntsville, AL 35812 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2020年 / 637卷

基金：

新加坡国家研究基金会;

关键词：

galaxies; active; methods; statistical; X-rays; ACTIVE GALACTIC NUCLEI; S5 0716+714; LUMINOSITY FUNCTION; AGN; EVOLUTION; BAT; SPECTRA; CATALOG; CHANDRA; ORIGIN;

D O I：

10.1051/0004-6361/202037469

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Hard X-ray properties of beamed active galactic nuclei have been published in the 105-month Swift/BAT catalog, but there have not been any studies carried out so far on a well-defined, radio-selected sample of low-peaked blazars in the hard X-ray band. Aims. Using the statistically complete MOJAVE-1 sample, we aim to determine the hard X-ray properties of radio-selected blazars, including the enigmatic group of gamma-ray-faint blazars. Additionally, we aim to determine the contribution of radio-selected low-peaked blazars to the diffuse cosmic X-ray background (CXB). Methods. We determined photon indices, fluxes, and luminosities in the range of 20 keV-100 keV of the X-ray spectra of blazars and other extragalactic jets from the MOJAVE-1 sample, derived from the 105-month Swift/BAT survey. We calculated log N-log S distributions and determined the luminosity functions. Results. The majority of the MOJAVE-1 blazars are found to be hard X-ray emitters albeit many at low count rates. The log N-log S distribution for the hard X-ray emission of radio-selected blazars is clearly non-Euclidean, in contrast to the radio flux density distribution. Approximately 0.2% of the CXB in the 20 keV-100 keV band can be resolved into MOJAVE-1 blazars. Conclusions. The peculiar log N-log S distribution disparity might be attributed to different evolutionary paths in the X-ray and radio bands, as tested by luminosity-function modeling. X-ray variability can be ruled out as the dominant contributor. Low-peaked blazars constitute an intrinsically different source population in terms of CXB contribution compared to similar studies of X-ray-selected blazars. The hard X-ray flux and spectral index can serve as a good proxy for the gamma-ray detection probability of individual sources. Future observations combining deep X-ray survey, for example, with eROSITA, and targeted gamma-ray observations with CTA can benefit strongly from the tight connection between these high-energy bands for the different blazar sub-classes.

引用

页数：20

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