Chandra Observations of the Gravitational Lenses PG 1115+080 and APM 08279+5255; Determination of a time-delay and constraints on H0

Details Chandra Observations of the Gravitational Lenses PG 1115+080 and APM 08279+5255; Determination of a time-delay and constraints on H0 Chandra Observations of the Gravitational Lenses PG 1115+080 and APM 08279+5255; Determination of a time-delay and constraints on H0

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.1614d&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #16.14; Bulletin of the American Astronomical Society, Vol. 33, p.1334

Astronomy and Astrophysics

Astronomy

3

Scientific paper

The gravitationally lensed quasars PG 1115+080 and APM 08279+5255 were observed with the Advanced CCD Imaging Spectrometer (ACIS) aboard the Chandra X-ray Observatory. PG 1115+080 was observed twice for 26.8 ks and 10 ks, respectively, and APM 08279+5255 was observed for 9.2 ks. Kolmogorov-Smirnov tests applied to the light-curves of the images indicate significant variability in selective energy bands in several of the lensed images. We find a strong correlation between the individual light-curves of images A1 and A2 of PG 1115+080 and derive a time-delay of 0.162+0.020-0.010 days with image A1 leading. This measurement demonstrates for the first time the feasibility of obtaining the time-delay of a gravitational lens system within a single X-ray observation. By combining the observed ``short-time'' delay between images A1 and A2 of PG 1115+080 with the previously observed ``long-time'' delay of ~ 24 days (Schechter et al. 1997) between images B and C we are able to narrow the allowable set of lens models for PG 1115+080 and thus place tighter limits on the Hubble constant. We acknowledge financial support by NASA grant NAS 8-38252.

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