X-RAY MONITORING OF GRAVITATIONAL LENSES WITHCHANDRA
- 23 July 2012
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 755 (1), 24
- https://doi.org/10.1088/0004-637x/755/1/24
Abstract
We present Chandra monitoring data for six gravitationally lensed quasars: QJ 0158–4325, HE 0435–1223, SDSS 0924+0219, SDSS 1004+4112, HE 1104–1805, and Q 2237+0305. X-ray microlensing variability is detected in all six lenses with high confidence. We furthermore detect energy-dependent microlensing in HE 0435–1223, SDSS 0924+0219, SDSS 1004+4112, and Q 2237+0305. Through a detailed spectral analysis for each lens we find that simple power-law models plus Gaussian emission lines give good fits to the spectra. We detect intrinsic spectral variability in two epochs of Q 2237+0305, and differential absorption between images in QJ 0158–4325 and Q2237+0305. We also detect the Fe Kα emission line in all six lenses, and the Ni XXVII Kα line in two images of Q 2237+0305. The rest-frame equivalent widths of the Fe Kα lines are measured to be 0.4-1.2 keV, significantly higher than those measured in typical active galactic nuclei of similar X-ray luminosities. This suggests that the Fe Kα emission region is more compact or centrally concentrated than the continuum emission region.This publication has 78 references indexed in Scilit:
- A MICROLENSING MEASUREMENT OF DARK MATTER FRACTIONS IN THREE LENSING GALAXIESThe Astrophysical Journal, 2011
- SIZES AND TEMPERATURE PROFILES OF QUASAR ACCRETION DISKS FROM CHROMATIC MICROLENSINGThe Astrophysical Journal, 2011
- SPITZEROBSERVATIONS OF A GRAVITATIONALLY LENSED QUASAR, QSO 2237+0305The Astrophysical Journal, 2009
- Discovery of Probable Relativistic Fe Emission and Absorption in the Cloverleaf Quasar H 1413+117The Astrophysical Journal, 2007
- X‐Ray and Optical Flux Anomalies in the Quadruply Lensed QSO 1RXS J1131−1231The Astrophysical Journal, 2006
- ChandraObservations of the Cloverleaf Quasar H1413+117: A Unique Laboratory for Microlensing Studies of a LoBAL QuasarThe Astrophysical Journal, 2004
- Caught in the Act:ChandraObservations of Microlensing of the Radio‐loud Quasar MG J0414+0534The Astrophysical Journal, 2002
- ChandraDetects a Rapid Flare in the Gravitationally Lensed Mini–Broad Absorption Line QSO RX J0911.4+0551The Astrophysical Journal, 2001
- Keck Mid‐Infrared Imaging of QSO 2237+0305The Astrophysical Journal, 2000
- Flux variations of QSO 0957 + 561 A, B and image splitting by stars near the light pathNature, 1979