C.D.S. - SIMBAD4 rel 1.7 - 2021.01.27CET17:59:31

2008A&A...490..989F - Astronomy and Astrophysics, volume 490, 989-994 (2008/11-2)

Q2237+0305 in X-rays: spectra and variability with XMM-Newton.


Abstract (from CDS):

X-ray observations of gravitationally lensed quasars may allow us to probe the inner structure of the central engine of a quasar. Observations of Q2237+0305 (Einstein Cross) in X-rays may be used to constrain the inner structure of the X-ray emitting source. Here we analyze the XMM-Newton observation of the quasar in the gravitational lens system Q2237+0305 taken during 2002. Combined spectra of the four images of the quasar in this system were extracted and modelled with a power-law model. Statistical analysis was used to test the variability of the total flux. The total X-ray flux from all the images of this quadruple gravitational lens system is 6x10–13erg/cm2/s in the range 0.2-10keV, showing no significant X-ray spectral variability during almost 42ks of the observation time. Fitting of the cleaned source spectrum yields a photon power-law index of Γ=1.82–0.08+0.07. The X-ray lightcurves obtained after background subtraction are compatible with the hypothesis of a stationary flux from the source.

Abstract Copyright:

Journal keyword(s): gravitational lensing - X-rays: general - galaxies: quasars: general

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 QSO J2240+0321 QSO 22 40 30.234 +03 21 30.63           ~ 646 0
2 Z 378-15 G 22 40 30.23447 +03 21 30.6290           ~ 629 0

    Equat.    Gal    SGal    Ecl

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