SIMBAD references

2010ApJ...710...24S - Astrophys. J., 710, 24-28 (2010/February-2)

Swift burst alert telescope, Fermi large area telescope, and the blazar sequence.

SAMBRUNA R.M., DONATO D., AJELLO M., MARASCHI L., TUELLER J., BAUMGARTNER W., SKINNER G., MARKWARDT C., BARTHELMY S., GEHRELS N. and MUSHOTZKY R.F.

Abstract (from CDS):

Using public Fermi Large Area Telescope (LAT) and Swift Burst Alert Telescope observations, we constructed the first sample of blazars selected at both hard X-rays and gamma rays. Studying its spectral properties, we find a luminosity dependence of the spectral slopes at both energies. Specifically, luminous blazars, generally classified as flat spectrum radio quasars, have hard continua in the medium-hard X-ray range but soft continua in the LAT gamma-ray range (photon indices ΓX≲ 2 and ΓG≳ 2), while lower luminosity blazars, classified as BL Lacs, have opposite behavior, i.e., soft X-ray and hard gamma-ray continua (ΓX≳ 2.4 and ΓG< 2). The trends are confirmed by detailed Monte Carlo simulations explicitly taking into account the observational biases of both instruments. Our results support the so-called blazar sequence which was originally based on radio samples of blazars and radio luminosities. We also argue that the X-ray-to-gamma-ray continua of blazars may provide independent insights into the physical conditions around the jet, complementing/superseding the ambiguities of the traditional classification based on optical properties.

Abstract Copyright:

Journal keyword(s): BL Lacertae objects: general - galaxies: jets - quasars: general - X-rays: galaxies

Simbad objects: 9

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2010ApJ...710...24S and select 'bookmark this link' or equivalent in the popup menu


2019.09.19-09:08:58

© Université de Strasbourg/CNRS

    • Contact