2006A&A...455..871F


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.21CEST08:39:57

2006A&A...455..871F - Astronomy and Astrophysics, volume 455, 871-877 (2006/9-1)

Simultaneous X-ray and optical observations of S5 0716+714 after the outburst of March 2004.

FOSCHINI L., TAGLIAFERRI G., PIAN E., GHISELLINI G., TREVES A., MARASCHI L., TAVECCHIO F., DI COCCO G. and ROSEN S.R.

Abstract (from CDS):

At the end of March 2004, the blazar S5 0716+714 underwent an optical outburst that prompted for quasi-simultaneous target-of-opportunity observations with the INTEGRAL and XMM-Newton satellites. In this paper, we report the results of the XMM-Newton and INTEGRAL OMC data analysis. The X-ray spectrum is well-represented by a concave broken power-law model, with the break at about 2 keV. In the framework of the synchrotron self-Compton model, the softer part of the spectrum, which is described by a power law of index α≃1.8 (fν ∝ν–α), is probably due to synchrotron emission, while the harder part of the spectrum, which has α≃1, is due to inverse Compton emission. The blazar shows the long and short-term variability typical of low-frequency peaked BL Lac (LBL): the former is manifested by a gradual decrease in the optical flux from the peak as observed by ground telescopes at the end of March 2004, while the latter is characterized by soft X-ray and optical flares on time scales from a few thousand seconds to few hours. We can follow spectral variations on sub-hour time scales and study their correlation with the flux variability. We find evidence that the peak energy of the time-resolved spectra is increasing with flux. The modeling of the spectral energy distribution compared with archival observations suggests that the long-term variability (from outburst to quiescence or viceversa) could be due to a change in the injected power, while the short-term variability (flares) could be explained with changes in the slope of the distribution of the electrons.

Abstract Copyright:

Journal keyword(s): galaxies: BL Lacertae objects: general - galaxies: BL Lacertae objects: individual: S5 0716+714 - X-rays: galaxies

Simbad objects: 3

goto Full paper

goto View the reference in ADS

Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 8C 0716+714 BLL 07 21 53.4484901266 +71 20 36.362058601   15.5 14.17 14.27   ~ 1160 1
2 7C 1219+2830 BLL 12 21 31.6902446544 +28 13 58.500383827   16.81 16.11 14.24   ~ 796 1
3 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 2040 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2006A&A...455..871F and select 'bookmark this link' or equivalent in the popup menu


2021.04.21-08:39:57

© Université de Strasbourg/CNRS

    • Contact