The EUV variability of the luminous QSO HS 1700+6416
Abstract
We report on the first observations of variations in UV (intrinsic EUV 330 Å) flux of the luminous QSO HS 1700+6416 (z = 2.72) over a decade. The amplitude of variations increases from ±0.1 mag in the optical (R) to up to a factor of 3 at 1250 Å. This is apparently an extension of the increase in amplitude of variations towards shorter wavelengths observed with IUE in low z AGN (Paltani & Courvoisier 1996) to the EUV. The time-scale for variations with the largest amplitudes is ≥1/2 yr to years. We briefly discuss the consequences of the observed variations on the ionizing metagalactic UV background.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 2005
- DOI:
- 10.1051/0004-6361:20042303
- arXiv:
- arXiv:astro-ph/0504014
- Bibcode:
- 2005A&A...436..465R
- Keywords:
-
- galaxies: clusters: individual HS 1700+6416;
- galaxies: quasars: general;
- Astrophysics
- E-Print:
- 4 pages, 3 figures