Spectral properties of bright Fermi-detected blazars in the gamma-ray band

Abdo, A. A.

doi:10.1088/0004-637X/710/2/1271

Title: Spectral properties of bright Fermi-detected blazars in the gamma-ray band

Journal Article · 28 January 2010 · The Astrophysical Journal

DOI: https://doi.org/10.1088/0004-637X/710/2/1271 · OSTI ID:1357578

Abdo, A. A. ^[1]

Naval Research Lab. (NRL), Washington, DC (United States); National Academy of Sciences, Washington, DC (United States); et al.

We investigated the gamma-ray energy spectra of bright blazars of the LAT Bright AGN Sample (LBAS) using Fermi-LAT data. Spectral properties (hardness, curvature, and variability) established using a data set accumulated over 6 months of operation are presented and discussed for different blazar classes and subclasses: flat spectrum radio quasars (FSRQs), low-synchrotron peaked BLLacs (LSP-BLLacs), intermediate-synchrotron peaked BLLacs (ISP-BLLacs), and high-synchrotron peaked BLLacs (HSP-BLLacs). Furthermore, the distribution of photon index (Γ, obtained from a power-law fit above 100 MeV) is found to correlate strongly with blazar subclass. The change in spectral index from that averaged over the 6 months observing period is < 0.2-0.3 when the flux varies by about an order of magnitude, with a tendency toward harder spectra when the flux is brighter for FSRQs and LSP-BLLacs. A strong departure from a single power-law spectrum appears to be a common feature for FSRQs. Finally, we present this feature for some high-luminosity LSP-BLLacs, and a small number of ISP-BLLacs. It is absent in all LBAS HSP-BLLacs. For 3C 454.3 and AO 0235+164, the two brightest FSRQ source and LSP-BLLac source, respectively, a broken power law (BPL) gives the most acceptable of power law, BPL, and curved forms. The consequences of these findings are discussed.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Fermi LAT Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1357578

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 710; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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MAGIC detection of very high energy gamma-ray emission from the low-luminosity blazar 1ES 1741+196 Collaboration, Magic; Ahnen, M. L.; Ansoldi, S. arXiv https://doi.org/10.48550/arxiv.1702.06795	text	January 2017
Multiwavelength picture of the blazar S5 0716+714 during its brightest outburst Manganaro, Marina; Pedaletti, Giovanna; Doert, Marlene arXiv https://doi.org/10.48550/arxiv.1704.03238	text	January 2017
Multiwavelength Photometric and Spectropolarimetric Analysis of the FSRQ 3C 279 Patiño-Álvarez, V. M.; Fernandes, S.; Chavushyan, V. arXiv https://doi.org/10.48550/arxiv.1806.01693	text	January 2018
On the multi-wavelength Emission from CTA 102 Gasparyan, S.; Sahakyan, N.; Baghmanyan, V. arXiv https://doi.org/10.48550/arxiv.1807.02869	text	January 2018
Fermi-Large Area Telescope observations of the brightest Gamma-ray flare ever detected from CTA 102 Prince, Raj; Raman, Gayathri; Hahn, Joachim arXiv https://doi.org/10.48550/arxiv.1808.05027	text	January 2018
Systematic Physical Characterization of the Gamma-Ray Spectra of 2FHL Blazars Berg, Jacobus P. van den; Boettcher, Markus; Dominguez, Alberto arXiv https://doi.org/10.48550/arxiv.1901.03494	text	January 2019
General Physical Properties of Gamma-ray Emitting Narrow-Line Seyfert 1 Galaxies Paliya, Vaidehi S.; Parker, M. L.; Jiang, J. arXiv https://doi.org/10.48550/arxiv.1901.07613	text	January 2019
A decade of multi-wavelength observations of the TeV blazar 1ES 1215+303: Extreme shift of the synchrotron peak frequency and long-term optical-gamma-ray flux increase Valverde, Janeth; Horan, Deirdre; Bernard, Denis arXiv https://doi.org/10.48550/arxiv.2002.04119	text	January 2020

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