A FAST FLARE AND DIRECT REDSHIFT CONSTRAINT IN FAR-ULTRAVIOLET SPECTRA OF THE BLAZAR S5 0716+714

被引：59
作者：
Danforth, Charles W. [1 ]
Nalewajko, Krzysztof [1 ]
France, Kevin [1 ]
Keeney, Brian A. [1 ]
机构：
[1] Univ Colorado, CASA, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA
来源：
ASTROPHYSICAL JOURNAL | 2013年 / 764卷 / 01期
基金：
美国国家科学基金会;
关键词：
BL Lacertae objects: individual (S50716+714); galaxies: active; galaxies: jets; intergalactic medium; quasars: absorption lines; radiation mechanisms: non-thermal; ultraviolet: general; BL-LACERTAE OBJECTS; ACTIVE GALACTIC NUCLEI; GAMMA-RAY EMISSION; OPTICAL VARIABILITY; INTERGALACTIC MEDIUM; RAPID VARIABILITY; TEV VARIABILITY; COMPLETE SAMPLE; PKS 1222+216; ENERGY;
D O I：
10.1088/0004-637X/764/1/57
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The BL Lacertae object S5 0716+714 is one of the most studied blazars on the sky due to its active variability and brightness in many bands, including very-high-energy gamma rays. We present here two serendipitous results from recent far-ultraviolet spectroscopic observations by the Cosmic Origins Spectrograph onboard the Hubble Space Telescope (HST). First, during the course of our 7.3 hr HST observations, the blazar increased in flux rapidly by similar to 40% (-0.45 mag hr(-1)) followed by a slower decline (+0.36 mag hr(-1)) to previous FUV flux levels. We model this flare using asymmetric flare templates and constrain the physical size and energetics of the emitting region. Furthermore, the spectral index of the object softens considerably during the course of the flare from alpha(nu) approximate to -1.0 to alpha(nu) approximate to -1.4. Second, we constrain the source redshift directly using the similar to 30 intervening absorption systems. A system at z = 0.2315 is detected in Ly alpha, Ly beta, OVI, and NV and defines the lower bound on the source redshift. No absorbers are seen in the remaining spectral coverage (0.2315 < z(Ly alpha) less than or similar to 0.47) and we set a statistical upper bound of z < 0.322 (95% confidence) on the blazar. This is the first direct redshift limit for this object and is consistent with literature estimates of z = 0.31 +/- 0.08 based on the detection of a host galaxy.
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