Chandra Observation of the "Einstein Cross" Quasar 2237+0305

Details Chandra Observation of the "Einstein Cross" Quasar 2237+0305 Chandra Observation of the "Einstein Cross" Quasar 2237+0305

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17110d&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present the 30.7 ks observation of the gravitationally lensed quasar 2237+0305 (Einstein Cross) observed by the Advanced CCD Imaging Spectrometer (ACIS) aboard the Chandra X-ray Observatory on 2000, September 9. The imaging deconvolution result shows five x-ray images within the lens system where three of them correspond to the optical image of A, B, and C, and the other two images are close to the optical image D. Simple spectral fitting of powerlaw with absorption to all the images gives a photon index of 1.89^+0.13_-0.11. The flux and luminosity obtained from this model is 4.49e-13 ergs/sec/cm^2 and 1.12e46 ergs/s in 0.6-8.0 keV energy band and is consistent with the previous ROSAT observation. The flux ratio of the images is consistent with the optical flux ratio which suggests the x-ray emission is microlensed as predicted by the theory. More detailed fitting result indicates differential absorption within the lensing galaxy. Furthermore, we detected a broad emission feature close to the redshifted energy of the Iron K_α line in the brightest image A. This is very unusual considering the luminosity of the quasar. Future observation is needed to establish a more precise profile of this emission feature. We acknowledge financial support by NASA grant NAS 8-38252 and AST-9529230 and AST-9970827 and California Space Institute grant CS-16-93.

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