2005A&A...436..465R


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST13:26:48

2005A&A...436..465R - Astronomy and Astrophysics, volume 436, 465-468 (2005/6-3)

The EUV variability of the luminous QSO HS 1700+6416.

REIMERS D., HAGEN H.-J., SCHRAMM J., KRISS G.A. and SHULL J.M.

Abstract (from CDS):

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 1250Å. This is apparently an extension of the increase in amplitude of variations towards shorter wavelengths observed with IUE in low z AGN (Paltani & Courvoisier, 1996A&A...312...55P) to the EUV. The time-scale for variations with the largest amplitudes is ≥1/2yr to years. We briefly discuss the consequences of the observed variations on the ionizing metagalactic UV background.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: HS 1700+6416 - galaxies: quasars: general

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3399 2
2 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5349 1
3 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2414 0
4 HS 1700+6416 QSO 17 01 00.6195618802 +64 12 09.118927057   16.39 16.17     ~ 344 0
5 NGC 7469 Sy1 23 03 15.674 +08 52 25.28 12.60 13.00 12.34     ~ 1903 3
6 QSO B2347-4342 QSO 23 50 34.2595236845 -43 25 59.680334378   16.3 16.3     ~ 160 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-13:26:48

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