Upper limits on TeV gamma-ray emission from active galactic nuclei

The results of a search for TeV gamma-ray emission from 35 active galactic nuclei (AGNs) using the Whippie Observatory High Resolution Atmospheric Cerenkov Camera are reported. Fifteen of these objects have been detected at GeV energies by the EGRET experiment on the Compton Gamma Ray Observatory. N...

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Detalles Bibliográficos
Autores principales: Kerrick, A.D., Akerlof, C.W., Biller, S., Buckley, J., Carter-Lewis, D.A., Cawley, M.F., Chantell, M., Connaughton, V., Fegan, D.J., Fennell, S., Gaidos, J., Hillas, A.M., Kwok, P.W., Lamb, R.C., Lappin, T., Lessard, R., Mcenery, J., Meyer, D.I., Mohanty, G., Quinn, J., Rose, H.J., Rovero, A.C., Sembroski, G., Schubnell, M.S., Punch, M., Weekes, T.C., West, M., Wilson, C., Zweerink, J.
Formato: JOUR
Materias:
Galaxies: active
Galaxies: nuclei
Gamma rays: observations
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0004637X_v452_n2_p588_Kerrick
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:The results of a search for TeV gamma-ray emission from 35 active galactic nuclei (AGNs) using the Whippie Observatory High Resolution Atmospheric Cerenkov Camera are reported. Fifteen of these objects have been detected at GeV energies by the EGRET experiment on the Compton Gamma Ray Observatory. None of the 35 objects gave a signal at the 3 σ level; Mrk 421 remains the only AGN detected at TeV energies. The absence of a TeV signal may imply a change in the primary source spectrum and/or the effect of absorption by pair production on intergalactic infrared photons.

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