BLAZAR SPECTRAL PROPERTIES AT 74 MHz

被引：33

作者：

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

Giroletti, M. ^{[3
]}

Paggi, A. ^{[4
]}

D'Abrusco, R. ^{[4
]}

Tosti, G. ^{[5
]}

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] INAF Ist Radioastron, I-40129 Bologna, Italy

[4] Harvard Univ, Smithsonian Astrophys Observ, Cambridge, MA 02138 USA

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

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2013年 / 208卷 / 02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; radiation mechanisms: non-thermal; BL LACERTAE OBJECTS; EXTENDED RADIO-EMISSION; ACTIVE GALACTIC NUCLEI; SPACE-TELESCOPE SURVEY; CENTIMETER WAVELENGTHS; FLUX-DENSITY; SKY SURVEY; 1ST SURVEY; CATALOG; SAMPLE;

D O I：

10.1088/0067-0049/208/2/15

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Blazars are the most extreme class of active galactic nuclei. Despite a previous investigation at 102 MHz for a small sample of BL Lac objects and our recent analysis of blazars detected in the Westerbork Northern Sky Survey, a systematic study of the blazar spectral properties at frequencies below 100 MHz has been never carried out. In this paper, we present the first analysis of the radio spectral behavior of blazars based on the recent Very Large Array Low-frequency Sky Survey (VLSS) at 74 MHz. We search for blazar counterparts in the VLSS catalog, confirming that they are detected at 74 MHz. We then show that blazars present radio-flat spectra (i.e., radio spectral indices of similar to 0.5) when evaluated, which also about an order of magnitude in frequency lower than previous analyses. Finally, we discuss the implications of our findings in the context of the blazars-radio galaxies connection since the low-frequency radio data provide a new diagnostic tool to verify the expectations of the unification scenario for radio-loud active galaxies.

引用

页数：7

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