Discovery of Very High Energy gamma-Ray Emission from Centaurus a with H.E.S.S.

We report the discovery of faint very high energy (VHE; E > 100 GeV) gamma-ray emission from the radio galaxy Centaurus A in observations performed with the High Energy Stereoscopic System (H.E.S.S.) experiment, an imaging atmospheric Cherenkov telescope array consisting of four telescopes lo...

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Main Authors:	Aharonian, F., Akhperjanian, A., Anton, G., De Almeida, U., Bazer-Bachi, A., Becherini, Y., Behera, B., Benbow, W., Bernlöhr, K., Boisson, C., Bochow, A., Borrel, V., Brion, E., Brucker, J., Brun, P., BüHLER, R., Bulik, T., Büsching, I., Boutelier, T., Chadwick, P., Charbonnier, A., Chaves, R., Cheesebrough, A., Chounet, L., Clapson, A., Coignet, G., Dalton, M., Daniel, M., Davids, I., Degrange, B., Deil, C., Dickinson, H., Djannati-Ataï, A., Domainko, W., Drury, L., Dubois, F., Dubus, G., Dyks, J., Dyrda, M., Egberts, K., Emmanoulopoulos, D., Espigat, P., Farnier, C., Feinstein, F., Fiasson, A., Förster, A., Fontaine, G., Füling, M., Gabici, S., Gallant, Y., Gerard, L., Giebels, B., Glicenstein, J., Glück, B., Goret, P., Göhring, D., Häuser, D., Hauser, M., Heinz, S., Heinzelmann, G., Henri, G., Hermann, G., Hinton, J., Hoffmann, A., Hofmann, W., Holleran, M., Hoppe, P., Horns, D., Jacholkowska, A., De Jager, O., Jahn, C., Jung, I., Katarzynski, K., Katz, U., Kaufmann, S., Kendziorra, E., Kerschhaggl, M., Khangulyan, D., Khélifi, B., Keogh, D., Kluzniak, W., Kneiske, T., Komin, N., Kosack, K., Lamanna, G., Latham, I., Lenain, J., Lohse, T., Marandon, V., Martin, J., Martineau-Huynh, O., Marcowith, A., Maurin, D., McComb, T., Medina, C., Moderski, R., Moulin, E., Naumann-Godo, M., de Naurois, M., Nedbal, D., Nekrassov, D., Niemiec, J., Nolan, S., Ohm, S., Olive, J., de Oña Wilhelmi, E., Orford, K., Ostrowski, M., Panter, M., Paz Arribas, M., Pedaletti, G., Pelletier, G., Petrucci, P., Pita, S., Pühlhofer, G., Punch, M., Quirrenbach, A., Raubenheimer, B., Raue, M., Rayner, S., Renaud, M., Rieger, F., Ripken, J., Rob, L., Rosier Lees, S., Rowell, G., Rudak, B., Rulten, C., Ruppel, J., Sahakian, V., Santangelo, A., Schlickeiser, R., Schöck, F., Schröder, R., Schwanke, U., Schwarzburg, S., Schwemmer, S., Shalchi, A., Sikora, M., Skilton, J., Sol, H., Spangler, D., Stawarz, L., Steenkamp, R., Stegmann, C., Superina, G., Szostek, A., Tam, P., Tavernet, J., Terrier, R., Tibolla, Omar, Tluczykont, M., van Eldik, C., Vasileiadis, G., Venter, C., Venter, L., Vialle, J., Vincent, P., Vink, J., Vivier, M., Volk, H., Volpe, F., Wagner, S., Ward, M., Zdziarski, A., Zech, A.
Format:	Journal Article
Published:	Institute of Physics Publishing 2009
Online Access:	http://iopscience.iop.org/1538-4357/695/1/L40/pdf/apjl_695_1_40.pdf http://hdl.handle.net/20.500.11937/23667

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author	Aharonian, F. Akhperjanian, A. Anton, G. De Almeida, U. Bazer-Bachi, A. Becherini, Y. Behera, B. Benbow, W. Bernlöhr, K. Boisson, C. Bochow, A. Borrel, V. Brion, E. Brucker, J. Brun, P. BüHLER, R. Bulik, T. Büsching, I. Boutelier, T. Chadwick, P. Charbonnier, A. Chaves, R. Cheesebrough, A. Chounet, L. Clapson, A. Coignet, G. Dalton, M. Daniel, M. Davids, I. Degrange, B. Deil, C. Dickinson, H. Djannati-Ataï, A. Domainko, W. Drury, L. Dubois, F. Dubus, G. Dyks, J. Dyrda, M. Egberts, K. Emmanoulopoulos, D. Espigat, P. Farnier, C. Feinstein, F. Fiasson, A. Förster, A. Fontaine, G. Füling, M. Gabici, S. Gallant, Y. Gerard, L. Giebels, B. Glicenstein, J. Glück, B. Goret, P. Göhring, D. Häuser, D. Hauser, M. Heinz, S. Heinzelmann, G. Henri, G. Hermann, G. Hinton, J. Hoffmann, A. Hofmann, W. Holleran, M. Hoppe, P. Horns, D. Jacholkowska, A. De Jager, O. Jahn, C. Jung, I. Katarzynski, K. Katz, U. Kaufmann, S. Kendziorra, E. Kerschhaggl, M. Khangulyan, D. Khélifi, B. Keogh, D. Kluzniak, W. Kneiske, T. Komin, N. Kosack, K. Lamanna, G. Latham, I. Lenain, J. Lohse, T. Marandon, V. Martin, J. Martineau-Huynh, O. Marcowith, A. Maurin, D. McComb, T. Medina, C. Moderski, R. Moulin, E. Naumann-Godo, M. de Naurois, M. Nedbal, D. Nekrassov, D. Niemiec, J. Nolan, S. Ohm, S. Olive, J. de Oña Wilhelmi, E. Orford, K. Ostrowski, M. Panter, M. Paz Arribas, M. Pedaletti, G. Pelletier, G. Petrucci, P. Pita, S. Pühlhofer, G. Punch, M. Quirrenbach, A. Raubenheimer, B. Raue, M. Rayner, S. Renaud, M. Rieger, F. Ripken, J. Rob, L. Rosier Lees, S. Rowell, G. Rudak, B. Rulten, C. Ruppel, J. Sahakian, V. Santangelo, A. Schlickeiser, R. Schöck, F. Schröder, R. Schwanke, U. Schwarzburg, S. Schwemmer, S. Shalchi, A. Sikora, M. Skilton, J. Sol, H. Spangler, D. Stawarz, L. Steenkamp, R. Stegmann, C. Superina, G. Szostek, A. Tam, P. Tavernet, J. Terrier, R. Tibolla, Omar Tluczykont, M. van Eldik, C. Vasileiadis, G. Venter, C. Venter, L. Vialle, J. Vincent, P. Vink, J. Vivier, M. Volk, H. Volpe, F. Wagner, S. Ward, M. Zdziarski, A. Zech, A.
author_facet	Aharonian, F. Akhperjanian, A. Anton, G. De Almeida, U. Bazer-Bachi, A. Becherini, Y. Behera, B. Benbow, W. Bernlöhr, K. Boisson, C. Bochow, A. Borrel, V. Brion, E. Brucker, J. Brun, P. BüHLER, R. Bulik, T. Büsching, I. Boutelier, T. Chadwick, P. Charbonnier, A. Chaves, R. Cheesebrough, A. Chounet, L. Clapson, A. Coignet, G. Dalton, M. Daniel, M. Davids, I. Degrange, B. Deil, C. Dickinson, H. Djannati-Ataï, A. Domainko, W. Drury, L. Dubois, F. Dubus, G. Dyks, J. Dyrda, M. Egberts, K. Emmanoulopoulos, D. Espigat, P. Farnier, C. Feinstein, F. Fiasson, A. Förster, A. Fontaine, G. Füling, M. Gabici, S. Gallant, Y. Gerard, L. Giebels, B. Glicenstein, J. Glück, B. Goret, P. Göhring, D. Häuser, D. Hauser, M. Heinz, S. Heinzelmann, G. Henri, G. Hermann, G. Hinton, J. Hoffmann, A. Hofmann, W. Holleran, M. Hoppe, P. Horns, D. Jacholkowska, A. De Jager, O. Jahn, C. Jung, I. Katarzynski, K. Katz, U. Kaufmann, S. Kendziorra, E. Kerschhaggl, M. Khangulyan, D. Khélifi, B. Keogh, D. Kluzniak, W. Kneiske, T. Komin, N. Kosack, K. Lamanna, G. Latham, I. Lenain, J. Lohse, T. Marandon, V. Martin, J. Martineau-Huynh, O. Marcowith, A. Maurin, D. McComb, T. Medina, C. Moderski, R. Moulin, E. Naumann-Godo, M. de Naurois, M. Nedbal, D. Nekrassov, D. Niemiec, J. Nolan, S. Ohm, S. Olive, J. de Oña Wilhelmi, E. Orford, K. Ostrowski, M. Panter, M. Paz Arribas, M. Pedaletti, G. Pelletier, G. Petrucci, P. Pita, S. Pühlhofer, G. Punch, M. Quirrenbach, A. Raubenheimer, B. Raue, M. Rayner, S. Renaud, M. Rieger, F. Ripken, J. Rob, L. Rosier Lees, S. Rowell, G. Rudak, B. Rulten, C. Ruppel, J. Sahakian, V. Santangelo, A. Schlickeiser, R. Schöck, F. Schröder, R. Schwanke, U. Schwarzburg, S. Schwemmer, S. Shalchi, A. Sikora, M. Skilton, J. Sol, H. Spangler, D. Stawarz, L. Steenkamp, R. Stegmann, C. Superina, G. Szostek, A. Tam, P. Tavernet, J. Terrier, R. Tibolla, Omar Tluczykont, M. van Eldik, C. Vasileiadis, G. Venter, C. Venter, L. Vialle, J. Vincent, P. Vink, J. Vivier, M. Volk, H. Volpe, F. Wagner, S. Ward, M. Zdziarski, A. Zech, A.
author_sort	Aharonian, F.
building	Curtin Institutional Repository
collection	Online Access
description	We report the discovery of faint very high energy (VHE; E > 100 GeV) gamma-ray emission from the radio galaxy Centaurus A in observations performed with the High Energy Stereoscopic System (H.E.S.S.) experiment, an imaging atmospheric Cherenkov telescope array consisting of four telescopes located in Namibia. Centaurus A has been observed for more than 120 hr. A signal with a statistical significance of 5.0sigma is detected from the region including the radio core and the inner kpc jets. The integral flux above an energy threshold of ~250 GeV is measured to be 0.8% of the flux of the Crab Nebula (apparent luminosity: L(>250 GeV) ˜2.6 × 1039 erg s-1, adopting a distance of 3.8 Mpc). The spectrum can be described by a power law with a photon index of 2.7 ± 0.5stat ± 0.2sys. No significant flux variability is detected in the data set. However, the low flux only allows detection of variability on the timescale of days to flux increments above a factor of ~15-20 (3sigma and 4sigma, respectively). The discovery of VHE gamma-ray emission from Centaurus A reveals particle acceleration in the source to >TeV energies and, together with M 87, establishes radio galaxies as a class of VHE emitters.
first_indexed	2025-11-14T07:49:10Z
format	Journal Article
id	curtin-20.500.11937-23667
institution	Curtin University Malaysia
institution_category	Local University
last_indexed	2025-11-14T07:49:10Z
publishDate	2009
publisher	Institute of Physics Publishing
recordtype	eprints
repository_type	Digital Repository
spelling	curtin-20.500.11937-236672017-02-28T01:37:04Z Discovery of Very High Energy gamma-Ray Emission from Centaurus a with H.E.S.S. Aharonian, F. Akhperjanian, A. Anton, G. De Almeida, U. Bazer-Bachi, A. Becherini, Y. Behera, B. Benbow, W. Bernlöhr, K. Boisson, C. Bochow, A. Borrel, V. Brion, E. Brucker, J. Brun, P. BüHLER, R. Bulik, T. Büsching, I. Boutelier, T. Chadwick, P. Charbonnier, A. Chaves, R. Cheesebrough, A. Chounet, L. Clapson, A. Coignet, G. Dalton, M. Daniel, M. Davids, I. Degrange, B. Deil, C. Dickinson, H. Djannati-Ataï, A. Domainko, W. Drury, L. Dubois, F. Dubus, G. Dyks, J. Dyrda, M. Egberts, K. Emmanoulopoulos, D. Espigat, P. Farnier, C. Feinstein, F. Fiasson, A. Förster, A. Fontaine, G. Füling, M. Gabici, S. Gallant, Y. Gerard, L. Giebels, B. Glicenstein, J. Glück, B. Goret, P. Göhring, D. Häuser, D. Hauser, M. Heinz, S. Heinzelmann, G. Henri, G. Hermann, G. Hinton, J. Hoffmann, A. Hofmann, W. Holleran, M. Hoppe, P. Horns, D. Jacholkowska, A. De Jager, O. Jahn, C. Jung, I. Katarzynski, K. Katz, U. Kaufmann, S. Kendziorra, E. Kerschhaggl, M. Khangulyan, D. Khélifi, B. Keogh, D. Kluzniak, W. Kneiske, T. Komin, N. Kosack, K. Lamanna, G. Latham, I. Lenain, J. Lohse, T. Marandon, V. Martin, J. Martineau-Huynh, O. Marcowith, A. Maurin, D. McComb, T. Medina, C. Moderski, R. Moulin, E. Naumann-Godo, M. de Naurois, M. Nedbal, D. Nekrassov, D. Niemiec, J. Nolan, S. Ohm, S. Olive, J. de Oña Wilhelmi, E. Orford, K. Ostrowski, M. Panter, M. Paz Arribas, M. Pedaletti, G. Pelletier, G. Petrucci, P. Pita, S. Pühlhofer, G. Punch, M. Quirrenbach, A. Raubenheimer, B. Raue, M. Rayner, S. Renaud, M. Rieger, F. Ripken, J. Rob, L. Rosier Lees, S. Rowell, G. Rudak, B. Rulten, C. Ruppel, J. Sahakian, V. Santangelo, A. Schlickeiser, R. Schöck, F. Schröder, R. Schwanke, U. Schwarzburg, S. Schwemmer, S. Shalchi, A. Sikora, M. Skilton, J. Sol, H. Spangler, D. Stawarz, L. Steenkamp, R. Stegmann, C. Superina, G. Szostek, A. Tam, P. Tavernet, J. Terrier, R. Tibolla, Omar Tluczykont, M. van Eldik, C. Vasileiadis, G. Venter, C. Venter, L. Vialle, J. Vincent, P. Vink, J. Vivier, M. Volk, H. Volpe, F. Wagner, S. Ward, M. Zdziarski, A. Zech, A. We report the discovery of faint very high energy (VHE; E > 100 GeV) gamma-ray emission from the radio galaxy Centaurus A in observations performed with the High Energy Stereoscopic System (H.E.S.S.) experiment, an imaging atmospheric Cherenkov telescope array consisting of four telescopes located in Namibia. Centaurus A has been observed for more than 120 hr. A signal with a statistical significance of 5.0sigma is detected from the region including the radio core and the inner kpc jets. The integral flux above an energy threshold of ~250 GeV is measured to be 0.8% of the flux of the Crab Nebula (apparent luminosity: L(>250 GeV) ˜2.6 × 1039 erg s-1, adopting a distance of 3.8 Mpc). The spectrum can be described by a power law with a photon index of 2.7 ± 0.5stat ± 0.2sys. No significant flux variability is detected in the data set. However, the low flux only allows detection of variability on the timescale of days to flux increments above a factor of ~15-20 (3sigma and 4sigma, respectively). The discovery of VHE gamma-ray emission from Centaurus A reveals particle acceleration in the source to >TeV energies and, together with M 87, establishes radio galaxies as a class of VHE emitters. 2009 Journal Article http://hdl.handle.net/20.500.11937/23667 http://iopscience.iop.org/1538-4357/695/1/L40/pdf/apjl_695_1_40.pdf Institute of Physics Publishing restricted
spellingShingle	Aharonian, F. Akhperjanian, A. Anton, G. De Almeida, U. Bazer-Bachi, A. Becherini, Y. Behera, B. Benbow, W. Bernlöhr, K. Boisson, C. Bochow, A. Borrel, V. Brion, E. Brucker, J. Brun, P. BüHLER, R. Bulik, T. Büsching, I. Boutelier, T. Chadwick, P. Charbonnier, A. Chaves, R. Cheesebrough, A. Chounet, L. Clapson, A. Coignet, G. Dalton, M. Daniel, M. Davids, I. Degrange, B. Deil, C. Dickinson, H. Djannati-Ataï, A. Domainko, W. Drury, L. Dubois, F. Dubus, G. Dyks, J. Dyrda, M. Egberts, K. Emmanoulopoulos, D. Espigat, P. Farnier, C. Feinstein, F. Fiasson, A. Förster, A. Fontaine, G. Füling, M. Gabici, S. Gallant, Y. Gerard, L. Giebels, B. Glicenstein, J. Glück, B. Goret, P. Göhring, D. Häuser, D. Hauser, M. Heinz, S. Heinzelmann, G. Henri, G. Hermann, G. Hinton, J. Hoffmann, A. Hofmann, W. Holleran, M. Hoppe, P. Horns, D. Jacholkowska, A. De Jager, O. Jahn, C. Jung, I. Katarzynski, K. Katz, U. Kaufmann, S. Kendziorra, E. Kerschhaggl, M. Khangulyan, D. Khélifi, B. Keogh, D. Kluzniak, W. Kneiske, T. Komin, N. Kosack, K. Lamanna, G. Latham, I. Lenain, J. Lohse, T. Marandon, V. Martin, J. Martineau-Huynh, O. Marcowith, A. Maurin, D. McComb, T. Medina, C. Moderski, R. Moulin, E. Naumann-Godo, M. de Naurois, M. Nedbal, D. Nekrassov, D. Niemiec, J. Nolan, S. Ohm, S. Olive, J. de Oña Wilhelmi, E. Orford, K. Ostrowski, M. Panter, M. Paz Arribas, M. Pedaletti, G. Pelletier, G. Petrucci, P. Pita, S. Pühlhofer, G. Punch, M. Quirrenbach, A. Raubenheimer, B. Raue, M. Rayner, S. Renaud, M. Rieger, F. Ripken, J. Rob, L. Rosier Lees, S. Rowell, G. Rudak, B. Rulten, C. Ruppel, J. Sahakian, V. Santangelo, A. Schlickeiser, R. Schöck, F. Schröder, R. Schwanke, U. Schwarzburg, S. Schwemmer, S. Shalchi, A. Sikora, M. Skilton, J. Sol, H. Spangler, D. Stawarz, L. Steenkamp, R. Stegmann, C. Superina, G. Szostek, A. Tam, P. Tavernet, J. Terrier, R. Tibolla, Omar Tluczykont, M. van Eldik, C. Vasileiadis, G. Venter, C. Venter, L. Vialle, J. Vincent, P. Vink, J. Vivier, M. Volk, H. Volpe, F. Wagner, S. Ward, M. Zdziarski, A. Zech, A. Discovery of Very High Energy gamma-Ray Emission from Centaurus a with H.E.S.S.
title	Discovery of Very High Energy gamma-Ray Emission from Centaurus a with H.E.S.S.
title_full	Discovery of Very High Energy gamma-Ray Emission from Centaurus a with H.E.S.S.
title_fullStr	Discovery of Very High Energy gamma-Ray Emission from Centaurus a with H.E.S.S.
title_full_unstemmed	Discovery of Very High Energy gamma-Ray Emission from Centaurus a with H.E.S.S.
title_short	Discovery of Very High Energy gamma-Ray Emission from Centaurus a with H.E.S.S.
title_sort	discovery of very high energy gamma-ray emission from centaurus a with h.e.s.s.
url	http://iopscience.iop.org/1538-4357/695/1/L40/pdf/apjl_695_1_40.pdf http://hdl.handle.net/20.500.11937/23667

Discovery of Very High Energy gamma-Ray Emission from Centaurus a with H.E.S.S.

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