A search for ultrahigh-energy gamma rays from egret-detected active galactic nuclei using casa-mia

M. Catanese; A. Borione; C. E. Covault; J. W. Cronin; B. E. Fick; L. F. Fortson; K. G. Gibbs; M. A.K. Glasmacher; K. D. Green; D. Kieda; J. Matthews; B. J. Newport; D. Nitz; R. A. Ong; D. Sinclair; J. C. Van Der Velde

doi:10.1086/177806

A search for ultrahigh-energy gamma rays from egret-detected active galactic nuclei using casa-mia

M. Catanese, A. Borione, C. E. Covault, J. W. Cronin, B. E. Fick, L. F. Fortson, K. G. Gibbs, M. A.K. Glasmacher, K. D. Green, D. Kieda, J. Matthews, B. J. Newport, D. Nitz, R. A. Ong, D. Sinclair, J. C. Van Der Velde

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Abstract

Extensive air shower data collected using the CASA-MIA detector are examined for evidence of gamma rays above 50 TeV from the directions of 32 active galactic nuclei. Gamma rays above 100 MeV from all of these objects have been detected previously by the Energetic Gamma Ray Experiment Telescope aboard the Compton Gamma Ray Observatory.. One of these, Markarian 421, has also been observed by the Whipple Observatory Gamma Ray Telescope to emit TeV gamma rays. No evidence of continuous or short-term emission is found for data collected between 1990 March and 1994 November. The flux limits calculated from these data indicate a reduction in the signal extrapolated from the EGRET data, which is consistent with microwave attenuation of the gamma-ray spectra.

Original language	English (US)
Pages (from-to)	572-580
Number of pages	9
Journal	Astrophysical Journal
Volume	469
Issue number	2 PART I
DOIs	https://doi.org/10.1086/177806
State	Published - Jan 1 1996
Externally published	Yes

Keywords

Cosmic rays
Galaxies: active
Galaxies: nuclei
Gamma rays: observations

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Catanese, M., Borione, A., Covault, C. E., Cronin, J. W., Fick, B. E., Fortson, L. F., Gibbs, K. G., Glasmacher, M. A. K., Green, K. D., Kieda, D., Matthews, J., Newport, B. J., Nitz, D., Ong, R. A., Sinclair, D., & Van Der Velde, J. C. (1996). A search for ultrahigh-energy gamma rays from egret-detected active galactic nuclei using casa-mia. Astrophysical Journal, 469(2 PART I), 572-580. https://doi.org/10.1086/177806

Catanese, M, Borione, A, Covault, CE, Cronin, JW, Fick, BE, Fortson, LF, Gibbs, KG, Glasmacher, MAK, Green, KD, Kieda, D, Matthews, J, Newport, BJ, Nitz, D, Ong, RA, Sinclair, D & Van Der Velde, JC 1996, 'A search for ultrahigh-energy gamma rays from egret-detected active galactic nuclei using casa-mia', Astrophysical Journal, vol. 469, no. 2 PART I, pp. 572-580. https://doi.org/10.1086/177806

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abstract = "Extensive air shower data collected using the CASA-MIA detector are examined for evidence of gamma rays above 50 TeV from the directions of 32 active galactic nuclei. Gamma rays above 100 MeV from all of these objects have been detected previously by the Energetic Gamma Ray Experiment Telescope aboard the Compton Gamma Ray Observatory.. One of these, Markarian 421, has also been observed by the Whipple Observatory Gamma Ray Telescope to emit TeV gamma rays. No evidence of continuous or short-term emission is found for data collected between 1990 March and 1994 November. The flux limits calculated from these data indicate a reduction in the signal extrapolated from the EGRET data, which is consistent with microwave attenuation of the gamma-ray spectra.",

keywords = "Cosmic rays, Galaxies: active, Galaxies: nuclei, Gamma rays: observations",

author = "M. Catanese and A. Borione and Covault, {C. E.} and Cronin, {J. W.} and Fick, {B. E.} and Fortson, {L. F.} and Gibbs, {K. G.} and Glasmacher, {M. A.K.} and Green, {K. D.} and D. Kieda and J. Matthews and Newport, {B. J.} and D. Nitz and Ong, {R. A.} and D. Sinclair and {Van Der Velde}, {J. C.}",

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AU - Catanese, M.

AU - Borione, A.

AU - Covault, C. E.

AU - Cronin, J. W.

AU - Fick, B. E.

AU - Fortson, L. F.

AU - Gibbs, K. G.

AU - Glasmacher, M. A.K.

AU - Green, K. D.

AU - Kieda, D.

AU - Matthews, J.

AU - Newport, B. J.

AU - Nitz, D.

AU - Ong, R. A.

AU - Sinclair, D.

AU - Van Der Velde, J. C.

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N2 - Extensive air shower data collected using the CASA-MIA detector are examined for evidence of gamma rays above 50 TeV from the directions of 32 active galactic nuclei. Gamma rays above 100 MeV from all of these objects have been detected previously by the Energetic Gamma Ray Experiment Telescope aboard the Compton Gamma Ray Observatory.. One of these, Markarian 421, has also been observed by the Whipple Observatory Gamma Ray Telescope to emit TeV gamma rays. No evidence of continuous or short-term emission is found for data collected between 1990 March and 1994 November. The flux limits calculated from these data indicate a reduction in the signal extrapolated from the EGRET data, which is consistent with microwave attenuation of the gamma-ray spectra.

AB - Extensive air shower data collected using the CASA-MIA detector are examined for evidence of gamma rays above 50 TeV from the directions of 32 active galactic nuclei. Gamma rays above 100 MeV from all of these objects have been detected previously by the Energetic Gamma Ray Experiment Telescope aboard the Compton Gamma Ray Observatory.. One of these, Markarian 421, has also been observed by the Whipple Observatory Gamma Ray Telescope to emit TeV gamma rays. No evidence of continuous or short-term emission is found for data collected between 1990 March and 1994 November. The flux limits calculated from these data indicate a reduction in the signal extrapolated from the EGRET data, which is consistent with microwave attenuation of the gamma-ray spectra.

KW - Cosmic rays

KW - Galaxies: active

KW - Galaxies: nuclei

KW - Gamma rays: observations

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A search for ultrahigh-energy gamma rays from egret-detected active galactic nuclei using casa-mia

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