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HESS J1943+213 : a candidate extreme BL Lacertae object
- Abramowski, A. (author)
- Acero, F. (author)
- Aharonian, F. (author)
- show more...
- Akhperjanian, A. G. (author)
- Anton, G. (author)
- Balzer, A. (author)
- Barnacka, A. (author)
- de Almeida, U. Barres (author)
- Bazer-Bachi, A. R. (author)
- Becherini, Yvonne (author)
- Becker, J. (author)
- Behera, B. (author)
- Bernloehr, K. (author)
- Bochow, A. (author)
- Boisson, C. (author)
- Bolmont, J. (author)
- Bordas, P. (author)
- Borrel, V. (author)
- Brucker, J. (author)
- Brun, F. (author)
- Brun, P. (author)
- Bulik, T. (author)
- Buesching, I. (author)
- Carrigan, S. (author)
- Casanova, S. (author)
- Cerruti, M. (author)
- Charbonnier, A. (author)
- Chaves, R. C. G. (author)
- Cheesebrough, A. (author)
- Chounet, L. -M (author)
- Clapson, A. C. (author)
- Coignet, G. (author)
- Colom, P. (author)
- Dalton, M. (author)
- Daniel, M. K. (author)
- Davids, I. D. (author)
- Degrange, B. (author)
- Deil, C. (author)
- Djannati-Atai, A. (author)
- Domainko, W. (author)
- Drury, L. O. 'C. (author)
- Dubois, F. (author)
- Dubus, G. (author)
- Dyks, J. (author)
- Dyrda, M. (author)
- Egberts, K. (author)
- Eger, P. (author)
- Espigat, P. (author)
- Fallon, L. (author)
- Farnier, C. (author)
- Fegan, S. (author)
- Feinstein, F. (author)
- Fernandes, M. V. (author)
- Fiasson, A. (author)
- Fontaine, G. (author)
- Foerster, A. (author)
- Fuessling, M. (author)
- Gallant, Y. A. (author)
- Gast, H. (author)
- Gerard, L. (author)
- Gerbig, D. (author)
- Giebels, B. (author)
- Glicenstein, J. F. (author)
- Glueck, B. (author)
- Goret, P. (author)
- Goering, D. (author)
- Haeffner, S. (author)
- Hague, J. D. (author)
- Hampf, D. (author)
- Hauser, M. (author)
- Heinz, S. (author)
- Heinzelmann, G. (author)
- Henri, G. (author)
- Hermann, G. (author)
- Hinton, J. A. (author)
- Hoffmann, A. (author)
- Hofmann, W. (author)
- Hofverberg, P. (author)
- Holler, M. (author)
- Horns, D. (author)
- Jacholkowska, A. (author)
- de Jager, O. C. (author)
- Jahn, C. (author)
- Jamrozy, M. (author)
- Jung, I. (author)
- Kastendieck, M. A. (author)
- Katarzynski, K. (author)
- Katz, U. (author)
- Kaufmann, S. (author)
- Keogh, D. (author)
- Khangulyan, D. (author)
- Khelifi, B. (author)
- Klochkov, D. (author)
- Kluzniak, W. (author)
- Kneiske, T. (author)
- Komin, Nu (author)
- Kosack, K. (author)
- Kossakowski, R. (author)
- Laffon, H. (author)
- Lamanna, G. (author)
- Lennarz, D. (author)
- Lohse, T. (author)
- Lopatin, A. (author)
- Lu, C-C (author)
- Marandon, V. (author)
- Marcowith, A. (author)
- Masbou, J. (author)
- Maurin, D. (author)
- Maxted, N. (author)
- McComb, T. J. L. (author)
- Medina, M. C. (author)
- Mehault, J. (author)
- Nguyen, N. (author)
- Moderski, R. (author)
- Moulin, E. (author)
- Naumann, C. L. (author)
- Naumann-Godo, M. (author)
- de Naurois, M. (author)
- Nedbal, D. (author)
- Nekrassov, D. (author)
- Nicholas, B. (author)
- Niemiec, J. (author)
- Nolan, S. J. (author)
- Ohm, S. (author)
- Olive, J-F (author)
- Wilhelmi, E. de Ona (author)
- Opitz, B. (author)
- Ostrowski, M. (author)
- Panter, M. (author)
- Arribas, M. Paz (author)
- Pedaletti, G. (author)
- Pelletier, G. (author)
- Petrucci, P-O (author)
- Pita, S. (author)
- Puehlhofer, G. (author)
- Quirrenbach, A. (author)
- Raue, M. (author)
- Rayner, S. M. (author)
- Reimer, A. (author)
- Reimer, O. (author)
- Renaud, M. (author)
- de los Reyes, R. (author)
- Rieger, F. (author)
- Rob, L. (author)
- Rosier-Lees, S. (author)
- Rowell, G. (author)
- Rudak, B. (author)
- Rulten, C. B. (author)
- Ruppel, J. (author)
- Sahakian, V. (author)
- Santangelo, A. (author)
- Schlickeiser, R. (author)
- Schoeck, F. M. (author)
- Schoenwald, A. (author)
- Schulz, A. (author)
- Schwanke, U. (author)
- Schwarzburg, S. (author)
- Schwemmer, S. (author)
- Shalchi, A. (author)
- Sikora, M. (author)
- Skilton, J. L. (author)
- Sol, H. (author)
- Spengler, G. (author)
- Stawarz, L. (author)
- Steenkamp, R. (author)
- Stegmann, C. (author)
- Stinzing, F. (author)
- Stycz, K. (author)
- Sushch, I. (author)
- Szostek, A. (author)
- Tavernet, J-P (author)
- Terrier, R. (author)
- Tibolla, O. (author)
- Tluczykont, M. (author)
- Valerius, K. (author)
- van Eldik, C. (author)
- Vasileiadis, G. (author)
- Venter, C. (author)
- Vialle, J. P. (author)
- Viana, A. (author)
- Vincent, P. (author)
- Vivier, M. (author)
- Voelk, H. J. (author)
- Volpe, F. (author)
- Vorobiov, S. (author)
- Vorster, M. (author)
- Wagner, S. J. (author)
- Ward, M. (author)
- Wierzcholska, A. (author)
- Zajczyk, A. (author)
- Zdziarski, A. A. (author)
- Zech, A. (author)
- Zechlin, H-S (author)
- Burnett, T. H. (author)
- Hill, A. B. (author)
- show less...
- (creator_code:org_t)
- 2011-03-30
- 2011
- English.
- In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 529, s. A49-
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- Context. The H. E. S. S. Cherenkov telescope array has been surveying the Galactic plane for new VHE (>100 GeV) gamma-ray sources. Aims. We report on a newly detected point-like source, HESS J1943+213. This source coincides with an unidentified hard X-ray source IGR J19443+2117, which was proposed to have radio and infrared counterparts. Methods. We combine new H. E. S. S., Fermi/LAT and Nancay Radio Telescope observations with pre-existing non-simultaneous multi-wavelength observations of IGR J19443+2117 and discuss the likely source associations as well as the interpretation as an active galactic nucleus, a gamma-ray binary or a pulsar wind nebula. Results. HESS J1943+213 is detected at the significance level of 7.9 sigma (post-trials) at RA(J2000) = 19(h)43(m)55(s) +/- 1(stat)(s) +/- 1(sys)(s), Dec(J2000) = +21 degrees 18'8 '' +/- 17(stat)'' +/- 20(sys)''. The source has a soft spectrum with photon index Gamma = 3.1 +/- 0.3(stat) +/- 0.2(sys) and a flux above 470 GeV of (1.3 +/- 0.2(stat) +/- 0.3(sys)) x 10(-12) cm(-2) s(-1). There is no Fermi/LAT counterpart down to a flux limit of 6 x 10(-9) cm(-2) s(-1) in the 0.1-100 GeV energy range (95% confidence upper limit calculated for an assumed power-law model with a photon index Gamma = 2.0). The data from radio to VHE gamma-rays do not show any significant variability. Conclusions. The lack of a massive stellar counterpart disfavors the binary hypothesis, while the soft VHE spectrum would be very unusual in case of a pulsar wind nebula. In addition, the distance estimates for Galactic counterparts places them outside of the Milky Way. All available observations favor an interpretation as an extreme, high-frequency peaked BL Lac object with a redshift z > 0.14. This would be the first time a blazar is detected serendipitously from ground-based VHE observations, and the first VHE AGN detected in the Galactic Plane.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- galaxies: active
- BL Lacertae objects: individual: IGR J19443+2117
- gamma rays: general
- Astropartikelfysik
- Astroparticle Physics
- Astronomy and astrophysics
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Abramowski, A.
- Acero, F.
- Aharonian, F.
- Akhperjanian, A. ...
- Anton, G.
- Balzer, A.
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- Barnacka, A.
- de Almeida, U. B ...
- Bazer-Bachi, A. ...
- Becherini, Yvonn ...
- Becker, J.
- Behera, B.
- Bernloehr, K.
- Bochow, A.
- Boisson, C.
- Bolmont, J.
- Bordas, P.
- Borrel, V.
- Brucker, J.
- Brun, F.
- Brun, P.
- Bulik, T.
- Buesching, I.
- Carrigan, S.
- Casanova, S.
- Cerruti, M.
- Punch, Michael
- Charbonnier, A.
- Chaves, R. C. G.
- Cheesebrough, A.
- Chounet, L. -M
- Clapson, A. C.
- Coignet, G.
- Colom, P.
- Conrad, Jan
- Dalton, M.
- Daniel, M. K.
- Davids, I. D.
- Degrange, B.
- Deil, C.
- Dickinson, Hugh ...
- Djannati-Atai, A ...
- Domainko, W.
- Drury, L. O. 'C.
- Dubois, F.
- Dubus, G.
- Dyks, J.
- Dyrda, M.
- Egberts, K.
- Eger, P.
- Espigat, P.
- Fallon, L.
- Farnier, C.
- Fegan, S.
- Feinstein, F.
- Fernandes, M. V.
- Fiasson, A.
- Fontaine, G.
- Foerster, A.
- Fuessling, M.
- Gallant, Y. A.
- Gast, H.
- Gerard, L.
- Gerbig, D.
- Giebels, B.
- Glicenstein, J. ...
- Glueck, B.
- Goret, P.
- Goering, D.
- Haeffner, S.
- Hague, J. D.
- Hampf, D.
- Hauser, M.
- Heinz, S.
- Heinzelmann, G.
- Henri, G.
- Hermann, G.
- Hinton, J. A.
- Hoffmann, A.
- Hofmann, W.
- Hofverberg, P.
- Holler, M.
- Horns, D.
- Jacholkowska, A.
- de Jager, O. C.
- Jahn, C.
- Jamrozy, M.
- Jung, I.
- Kastendieck, M. ...
- Katarzynski, K.
- Katz, U.
- Kaufmann, S.
- Keogh, D.
- Khangulyan, D.
- Khelifi, B.
- Klochkov, D.
- Kluzniak, W.
- Kneiske, T.
- Komin, Nu
- Kosack, K.
- Kossakowski, R.
- Laffon, H.
- Lamanna, G.
- Lennarz, D.
- Lohse, T.
- Lopatin, A.
- Lu, C-C
- Marandon, V.
- Marcowith, A.
- Masbou, J.
- Maurin, D.
- Maxted, N.
- McComb, T. J. L.
- Medina, M. C.
- Mehault, J.
- Nguyen, N.
- Moderski, R.
- Moulin, E.
- Naumann, C. L.
- Naumann-Godo, M.
- de Naurois, M.
- Nedbal, D.
- Nekrassov, D.
- Nicholas, B.
- Niemiec, J.
- Nolan, S. J.
- Ohm, S.
- Olive, J-F
- Wilhelmi, E. de ...
- Opitz, B.
- Ostrowski, M.
- Panter, M.
- Arribas, M. Paz
- Pedaletti, G.
- Pelletier, G.
- Petrucci, P-O
- Pita, S.
- Puehlhofer, G.
- Quirrenbach, A.
- Raue, M.
- Rayner, S. M.
- Reimer, A.
- Reimer, O.
- Renaud, M.
- de los Reyes, R.
- Rieger, F.
- Ripken, Joachim
- Rob, L.
- Rosier-Lees, S.
- Rowell, G.
- Rudak, B.
- Rulten, C. B.
- Ruppel, J.
- Ryde, Felix
- Sahakian, V.
- Santangelo, A.
- Schlickeiser, R.
- Schoeck, F. M.
- Schoenwald, A.
- Schulz, A.
- Schwanke, U.
- Schwarzburg, S.
- Schwemmer, S.
- Shalchi, A.
- Sikora, M.
- Skilton, J. L.
- Sol, H.
- Spengler, G.
- Stawarz, L.
- Steenkamp, R.
- Stegmann, C.
- Stinzing, F.
- Stycz, K.
- Sushch, I.
- Szostek, A.
- Tavernet, J-P
- Terrier, R.
- Tibolla, O.
- Tluczykont, M.
- Valerius, K.
- van Eldik, C.
- Vasileiadis, G.
- Venter, C.
- Vialle, J. P.
- Viana, A.
- Vincent, P.
- Vivier, M.
- Voelk, H. J.
- Volpe, F.
- Vorobiov, S.
- Vorster, M.
- Wagner, S. J.
- Ward, M.
- Wierzcholska, A.
- Zajczyk, A.
- Zdziarski, A. A.
- Zech, A.
- Zechlin, H-S
- Burnett, T. H.
- Hill, A. B.
- show less...
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