2007A&A...465..147C


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.20CEST07:47:05

2007A&A...465..147C - Astronomy and Astrophysics, volume 465, 147-156 (2007/4-1)

2003-2005 INTEGRAL and XMM-Newton observations of 3C 273.

CHERNYAKOVA M., NERONOV A., COURVOISIER T.J.-L., TUERLER M., SOLDI S., BECKMANN V., LUBINSKI P., WALTER R., PAGE K.L., STUHLINGER M., STAUBERT R. and McHARDY I.M.

Abstract (from CDS):

The aim of this paper is to study the evolution of the broadband spectrum of one of the brightest and nearest quasars 3C 273. We analyze the data obtained during quasi-simultaneous INTEGRAL and XMM-Newton monitoring of the blazar 3C 273 in 2003-2005 in the UV, X-ray and soft γ-ray bands and study the results in the context of the long-term evolution of the source. The 0.2-100keV spectrum of the source is well fitted by a combination of a soft cut-off power law and a hard power law. No improvement of the fit is achieved if one replaces the soft cut-off power law by either a blackbody, or a disk reflection model. During the observation period the source has reached the historically softest state in the hard X-ray domain with a photon index Γ=1.82±0.01. Comparing our data with available archived X-ray data from previous years, we find a secular evolution of the source toward softer X-ray emission (the photon index has increased by ΔΓ≃0.3-0.4 over the last thirty years). We argue that existing theoretical models have to be significantly modified to account for the observed spectral evolution of the source.

Abstract Copyright:

Journal keyword(s): quasars: individual: 3C 273

Simbad objects: 3

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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 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 2041 1
2 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5452 1
3 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2463 0

    Equat.    Gal    SGal    Ecl

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2021.06.20-07:47:05

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