Time delays in PG 1115+080: new estimates
Abstract
We report new estimates of the time delays in the quadruple gravitationally lensed quasar PG 1115+080, obtained from the monitoring data in filter R with the 1.5-m telescope at the Maidanak Mountain (Uzbekistan, Central Asia) in 2004-2006. The time delays are 16.4 d between images C and B and 12 d between C and A1+A2, with image C leading for both pairs. The only known estimates of the time delays in PG 1115 are those based on observations by Schechter et al. -23.7 and 9.4 d between images C and B, and C and A1+A2, respectively, - and as revised by Barkana -25 and 13.3 d for the same image components, but with the use of another method. The new values of time delays in PG 1115+080 may be expected to provide larger estimates of the Hubble constant, thus decreasing a diversity between the H0 estimates taken from gravitationally lensed quasars and those taken from other methods.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- November 2009
- DOI:
- 10.1111/j.1745-3933.2009.00770.x
- arXiv:
- arXiv:0910.1260
- Bibcode:
- 2009MNRAS.400L..90V
- Keywords:
-
- gravitational lensing;
- quasars: individual: PG 1115+080;
- dark matter;
- distance scale;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- 5 pages, 2 figures, Accepted for publication in MNRAS Letters