2008A&A...486..411S


Query : 2008A&A...486..411S

2008A&A...486..411S - Astronomy and Astrophysics, volume 486, 411-425 (2008/8-1)

The multiwavelength variability of 3C 273.

SOLDI S., TUERLER M., PALTANI S., ALLER H.D., ALLER M.F., BURKI G., CHERNYAKOVA M., LAEHTEENMAEKI A., McHARDY I.M., ROBSON E.I., STAUBERT R., TORNIKOSKI M., WALTER R. and COURVOISIER T.J.-L.

Abstract (from CDS):

We present an update of the 3C 273's database hosted by the ISDC, completed with data from radio to gamma-ray observations over the last 10 years. We use this large data set to study the multiwavelength properties of this quasar, especially focussing on its variability behaviour. We study the amplitude of the variations and the maximum variability time scales across the broad-band spectrum and correlate the light curves in different bands, specifically with the X-rays, to search for possible connections between the emission at different energies. 3C 273 shows variability at all frequencies, with amplitudes and time scales strongly depending on the energy and being the signatures of the different emission mechanisms. The variability properties of the X-ray band imply the presence of either two separate components (possibly a Seyfert-like and a blazar-like) or at least two parameters with distinct timing properties to account for the X-ray emission below and above ∼20keV. The dominant hard X-ray emission is most probably not due to electrons accelerated by the shock waves in the jet as their variability does not correlate with the flaring millimeter emission, but seems to be associated to long-timescale variations in the optical. This optical component is consistent with being optically thin synchrotron radiation from the base of the jet and the hard X-rays would be produced through inverse Compton processes (SSC and/or EC) by the same electron population. We show evidence that this synchrotron component extends from the optical to the near-infrared domain, where it is blended by emission of heated dust that we find to be located within about 1 light-year from the ultraviolet source.

Abstract Copyright:

Journal keyword(s): astronomical data bases: miscellaneous - galaxies: active - galaxies: quasars: individual: 3C 273 - X-rays: galaxies - infrared: galaxies - ultraviolet: galaxies

Simbad objects: 5

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Number of rows : 5
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 ESO 113-45 Sy1 01 23 45.7630391439 -58 48 20.811630442   14.08 13.83 13.34   ~ 791 0
2 NGC 3516 Sy1 11 06 47.4596406816 +72 34 07.189563769   13.12 12.40     ~ 1442 0
3 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 2042 1
4 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5456 1
5 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2467 0

    Equat.    Gal    SGal    Ecl

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2021.07.29-17:14:56

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