UNVEILING THE NATURE OF THE UNIDENTIFIED GAMMA-RAY SOURCES. III. GAMMA-RAY BLAZAR-LIKE COUNTERPARTS AT LOW RADIO FREQUENCIES

被引：51

作者：

Massaro, F. ^{[1
,2
]}

D'Abrusco, R. ^{[3
]}

Giroletti, M. ^{[4
]}

Paggi, A. ^{[3
]}

Masetti, N. ^{[5
]}

Tosti, G. ^{[6
,7
]}

Nori, M. ^{[8
]}

Funk, S. ^{[1
,2
]}

机构：

[1] SLAC Natl Lab, Menlo Pk, CA 94025 USA

[2] Kavli Inst Particle Astrophys & Cosmol, Menlo Pk, CA 94025 USA

[3] Harvard Smithsonian Astrophys Observ, Cambridge, MA 02138 USA

[4] INAF Ist Radioastron, I-40129 Bologna, Italy

[5] INAF Ist Astrofis Spaziale & Fis Cosm Bologna, I-40129 Bologna, Italy

[6] Univ Perugia, Dipartimento Fis, I-06123 Perugia, Italy

[7] Ist Nazl Fis Nucl, Sezione Perugia, I-06123 Perugia, Italy

[8] Univ Bologna, Dept Phys & Astron, I-40127 Bologna, Italy

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2013年 / 207卷 / 01期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

BL Lacertae objects: general; galaxies: active; gamma rays: galaxies; gamma rays: general quasars: general; radiation mechanisms: non-thermal; radio continuum: galaxies; COMPACT STEEP-SPECTRUM; ACTIVE GALACTIC NUCLEI; ALL-SKY SURVEY; CENTIMETER WAVELENGTHS; CHANDRA OBSERVATIONS; FLUX-DENSITY; 1ST SURVEY; CATALOG; EMISSION; IDENTIFICATION;

D O I：

10.1088/0067-0049/207/1/4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

About one-third of the gamma-ray sources listed in the second Fermi Large Area Telescope catalog (2FGL) have no firmly established counterpart at lower energies and so are classified as unidentified gamma-ray sources (UGSs). Here, we propose a new approach to find candidate counterparts for the UGSs based on the 325 MHz radio survey performed with the Westerbork Synthesis Radio Telescope in the northern hemisphere. First, we investigate the low-frequency radio properties of blazars, the largest known population of gamma-ray sources; then we search for sources with similar radio properties combining the information derived from theWesterbork Northern Sky Survey (WENSS) with those of the NRAO Very Large Array Sky Survey. We present a list of candidate counterparts for 32 UGSs with at least one counterpart in the WENSS. We also performed an extensive research in the literature to look for infrared and optical counterparts of the gamma-ray blazar candidates selected using the low-frequency radio observations to confirm their nature. On the basis of our multifrequency research, we identify 23 new gamma-ray blazar candidates out of the 32 UGSs investigated. Comparison with previous results on the UGSs is also presented. Finally, we speculate on the advantages of using low-frequency radio observations to associate UGSs and to search for gamma-ray pulsar candidates.

引用

页数：15

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