THE SPECTRAL INDEX PROPERTIES OF FERMI BLAZARS

In this paper, a sample of 451 blazars (193 flat spectrum radio quasars (FSRQs), 258 BL Lacertae objects) with corresponding X-ray and Fermi [gamma]-ray data is compiled to investigate the correlation both between the X-ray spectral index and the [gamma]-ray spectral index and between the spectral i...

Full description

Saved in:
Bibliographic Details
Published in:The Astrophysical journal 2012-12, Vol.761 (2), p.1-12
Main Authors: FAN, J. H, YANG, J. H, YUAN, Y. H, WANG, J, GAO, Y
Format: Article
Language:English
Subjects:
Astronomy
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BL LACERTAE OBJECTS
Blazars
COMPARATIVE EVALUATIONS
Correlation
Correlation analysis
CORRELATIONS
Earth, ocean, space
Exact sciences and technology
Flats
GALAXIES
GALAXY NUCLEI
GAMMA ASTRONOMY
GAMMA SPECTRA
INDEXES
LUMINOSITY
QUASARS
RADIOASTRONOMY
Spectra
X RADIATION
X-RAY SPECTRA
X-rays
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this paper, a sample of 451 blazars (193 flat spectrum radio quasars (FSRQs), 258 BL Lacertae objects) with corresponding X-ray and Fermi [gamma]-ray data is compiled to investigate the correlation both between the X-ray spectral index and the [gamma]-ray spectral index and between the spectral index and the luminosity, and to compare the spectral indexes [alpha] sub(X), [alpha] sub([gamma]), [alpha] sub(X)[gamma], and [alpha][gamma]X[gamma] for different subclasses. We also investigated the correlation between the X-ray and the [gamma]-ray luminosity. (1) Our analysis indicates that an anti-correlation exists between the X-ray and the [gamma]-ray spectral indexes for the whole sample. However, when we considered the subclasses of blazars (FSRQs, the low-peaked BL Lacertae objects (LBLs) and the high-peaked BL Lacertae objects (HBLs)) separately, there is not a clear relationship for each subclass. The effective spectral index shows that [alpha] sub(X)[gamma]|HBLs sub((= 1.02 + or - 0.12)) > [alpha] sub(X)[gamma]|LBLs sub((= 0.78 + or - 0.09)) ~ [alpha] sub(X)[gamma]|FSRQs(=0.79 + or - 0.09).
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/761/2/125