Research articles

search articles

My Pages

Stat

Members: 3645
Articles: 2'504'928
Articles rated: 2609

25 April 2024

» arxiv » 1004.2089

Article overview

Multi-wavelength Observations of H 2356-309
HESS Collaboration ; A. Abramowski ; F. Acero ; F. Aharonian ; A.G. Akhperjanian ; G. Anton ; U. Barres de Almeida ; A.R. Bazer-Bachi ; Y. Becherini ; B. Behera ; W. Benbow ; K. Bernloehr ; A. Bochow ; C. Boisson ; J. Bolmont ; V. Borrel ; J. Brucker ; F. Brun ; P. Brun ; R. Buehler ; T. Bulik ; I. Buesching ; T. Boutelier ; P.M. Chadwick ; A. Charbonnier ; R.C.G. Chaves ; A. Cheesebrough ; J. Conrad ; L.-M. Chounet ; A.C. Clapson ; G. Coignet ; L. Costamante ; M. Dalton ; M.K. Daniel ; I.D. Davids ; B. Degrange ; C. Deil ; H.J. Dickinson ; A. Djannati-Atai ; W. Domainko ; L.O'C. Drury ; F. Dubois ; G. Dubus ; J. Dyks ; M. Dyrda ; K. Egberts ; P. Eger ; P. Espigat ; L. Fallon ; C. Farnier ; S. Fegan ; F. Feinstein ; M.V. Fernandes ; A. Fiasson ; A. Foerster ; G. Fontaine ; M. Fuessling ; S. Gabici ; Y.A. Gallant ; L. Gerard ; D. Gerbig ; B. Giebels ; J.F. Glicenstein ; B. Glueck ; P. Goret ; D. Goering ; D. Hampf ; M. Hauser ; S. Heinz ; G. Heinzelmann ; G. Henri ; G. Hermann ; J.A. Hinton ; A. Hoffmann ; W. Hofmann ; P. Hofverberg ; M. Holleran ; S. Hoppe ; D. Horns ; A. Jacholkowska ; O.C. de Jager ; C. Jahn ; I. Jung ; K. Katarzynski ; U. Katz ; S. Kaufmann ; M. Kerschhaggl ; D. Khangulyan ; B. Khelifi ; D. Keogh ; D. Klochkov ; W. Kluzniak ; T. Kneiske ; Nu. Komin ; K. Kosack ; R. Kossakowski ; G. Lamanna ; J.-P. Lenain ; T. Lohse ; C.-C. Lu ; V. Marandon ; A. Marcowith ; J. Masbou ; D. Maurin ; T.J.L. McComb ; M.C. Medina ; J. Mehault ; R. Moderski ; E. Moulin ; M. Naumann-Godo ; M. de Naurois ; D. Nedbal ; D. Nekrassov ; N. Nguyen ; B. Nicholas ; J. Niemiec ; S.J. Nolan ; S. Ohm ; J-F. Olive ; E. de Ona Wilhelmi ; B. Opitz ; K.J. Orford ; M. Ostrowski ; M. Panter ; M. Paz Arribas ; G. Pedaletti ; G. Pelletier ; P.-O. Petrucci ; S. Pita ; G. Puehlhofer ; M. Punch ; A. Quirrenbach ; B.C. Raubenheimer ; M. Raue ; S.M. Rayner ; O. Reimer ; M. Renaud ; R. de los Reyes ; F. Rieger ; J. Ripken ; L. Rob ; S. Rosier-Lees ; G. Rowell ; B. Rudak ; C.B. Rulten ; J. Ruppel ; F. Ryde ; V. Sahakian ; A. Santangelo ; R. Schlickeiser ; F.M. Schoeck ; A. Schoenwald ; U. Schwanke ; S. Schwarzburg ; S. Schwemmer ; A. Shalchi ; I. Sushch ; M. Sikora ; J.L. Skilton ; H. Sol ; L. Stawarz ; R. Steenkamp ; C. Stegmann ; F. Stinzing ; A. Szostek ; P.H. Tam ; J.-P. Tavernet ; R. Terrier ; O. Tibolla ; M. Tluczykont ; K. Valerius ; C. van Eldik ; G. Vasileiadis ; C. Venter ; L. Venter ; J.P. Vialle ; A. Viana ; P. Vincent ; M. Vivier ; H.J. Voelk ; F. Volpe ; S. Vorobiov ; S.J. Wagner ; M. Ward ; A.A. Zdziarski ; A. Zech ; H.-S. Zechlin ;
Date:	13 Apr 2010
Abstract:	AIMS: The properties of the broad-band emission from the high-frequency peaked BL Lac H 2356-309 (z=0.165) are investigated. METHODS: Very High Energy (VHE; E > 100 GeV) observations of H 2356-309 were performed with the High Energy Stereoscopic System (HESS) from 2004 through 2007. Simultaneous optical/UV and X-ray observations were made with the XMM-Newton satellite on June 12/13 and June 14/15, 2005. NRT radio observations were also contemporaneously performed in 2005. ATOM optical monitoring observations were also made in 2007. RESULTS: A strong VHE signal, ~13 sigma total, was detected by HESS after the four years HESS observations (116.8 hrs live time). The integral flux above 240 GeV is I(>240 GeV) = (3.06 +- 0.26 {stat} +- 0.61 {syst}) x 10^{-12} cm^{-2} s^{-1}, corresponding to ~1.6% of the flux observed from the Crab Nebula. A time-averaged energy spectrum is measured from 200 GeV to 2 TeV and is characterized by a power law (photon index of Gamma = 3.06 +- 0.15 {stat} +- 0.10 {syst}). Significant small-amplitude variations in the VHE flux from H 2356-309 are seen on time scales of months and years, but not on shorter time scales. No evidence for any variations in the VHE spectral slope are found within these data. The XMM-Newton X-ray measurements show a historically low X-ray state, characterized by a hard, broken-power-law spectrum on both nights. CONCLUSIONS: The broad-band spectral energy distribution (SED) of the blazar can be adequately fit using a simple one-zone synchrotron self-Compton (SSC) model. In the SSC scenario, higher VHE fluxes could be expected in the future since the observed X-ray flux is at a historically low level.
Source:	arXiv, 1004.2089
Services:	Forum \| Review \| PDF \| Favorites

No review found.

Did you like this article?

This article or document is ...
important:
of broad interest:
readable:
new:
correct:
Global appreciation:

Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.

browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

ScienXe.org
» my Online CV
» Free

News, job offers and information for researchers and scientists:

home

contact

sitemap