Naomi Ota, Masamune Oguri, Xinyu Dai, Christopher S. Kochanek, Gordon T. Richards, Eran O. Ofek, Roger D. Blandford, Tim Schrabback, Naohisa Inada
We present results from Chandra observations of the z_l=0.58 cluster lens
SDSS J1029+2623, which is presently the largest separation gravitationally
lensed quasar. We clearly detect X-ray emission both from the lensing cluster
and the three lensed quasar images. The cluster has an X-ray temperature of kT
= 8.1 (+2.0, -1.2) keV and luminosity L_X = 9.6e44 erg s^-1. Its surface
brightness is centered near galaxy G2 and it is elongated East-West. We
identify a subpeak North-West of the main peak, which is suggestive of an
ongoing merger. Even so, the X-ray mass inferred from the hydrostatic
equilibrium assumption appears to be consistent with the Einstein radius of the
system. We find significant absorption in the soft X-ray spectrum of quasar
image C, which can be caused by an intervening material at either the lens or
source redshift. The X-ray flux ratios between the quasar images after
correcting for absorption are in reasonable agreement with those at optical and
radio wavelengths. This implies that microlensing effect is not significant for
this system and dark matter substructure is mainly responsible for the
anomalous flux ratios.
View original:
http://arxiv.org/abs/1202.1645
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