X-ray/UV/optical follow-up of the blazar PKS 2155-304 after the giant TeV flares of 2006 July

被引：52

作者：

Foschini, L. ^{[1
]}

Ghisellini, G.

Tavecchio, F.

Treves, A.

Maraschi, L.

Gliozzi, M.

Raiteri, C. M.

Villata, M.

Pian, E.

Tagliaferri, G.

Tosti, G.

Sambruna, R. M.

Malaguti, G.

Di Cocco, G.

Giommi, P.

机构：

[1] Ist Astrofis Spaziale & Fis Cosm, INAF, Bologna, Italy

[2] Osserv Astron Brera, INAF, Milan, Italy

[3] Univ Insubria, Dipartimento Sci, Como, Italy

[4] George Mason Univ, Sch Computat Sci, Dept Phys & Astron, Fairfax, VA 22030 USA

[5] Osserv Astron Torino, INAF, I-10025 Pino Torinese, Italy

[6] Osserv Astron Trieste, INAF, I-34131 Trieste, Italy

[7] Univ Perugia, Osservatorio Astron, I-06100 Perugia, Italy

[8] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[9] ASI Sci Data Ctr, Frascati, Italy

来源：

ASTROPHYSICAL JOURNAL | 2007年 / 657卷 / 02期

关键词：

BL Lacertae objects : general; BL Lacertae objects : individual (PKS 2155-304);

D O I：

10.1086/513271

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present all the publicly available data, from optical/UV wavelengths (UVOT) to X-rays (XRT, BAT), obtained from Swift observations of the blazar PKS 2155-304, performed in response to the rapid alert sent out after the strong TeV activity (up to 17 crab flux level at E > 200 GeV) at the end of 2006 July. The X-ray flux increased by a factor of 5 in the 0.3-10 keV energy band and by a factor of 1.5 at optical/UV wavelengths, with roughly 1 day of delay. The comparison of the spectral energy distribution built with data quasi-simultaneous to the TeV detections shows an increase of the overall normalization with respect to archival data but only a small shift of the frequency of the synchrotron peak that remains consistent with the values reported in past observations when the TeV activity was much weaker.

引用

页码：L81 / L84

页数：4

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