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Schubnell, M.S.; 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.A.; Hillas, A.M.; Kerrick, A.D.; Lamb, R.C.; Meyer, D.I.; Mohanty, G.; Rose, J.; Rovero, A.C. (...) Zweerink, J. "Very high energy gamma-ray emission from the blazar Markarian 421" (1996) Astrophysical Journal. 460(2 PART I):644-650
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Abstract:

Very high energy gamma-ray emission from the BL Lacertae object Markarian 421 has been detected over three observing seasons on 59 nights between 1992 April and 1994 June with the Whipple 10 m imaging Cherenkov telescope. During its initial detection in 1992, its flux above 500 GeV was 1.6 × 10-11 photons cm-2 s-1. Observations in 1993 confirmed this level of emission. For observations made between 1993 December and 1994 April, its intensity was a factor of 2.2 ± 0.5 lower. Observations on 1994 May 14 and 15 showed an increase over this quiescent level by a factor of ∼10 (see paper by Kerrick et al.). This strong outburst suggests that four episodes of increased flux measurements on similar timescales in 1992 and 1994 may be attributed to somewhat weaker outbursts. The variability of the TeV gamma-ray emission from Mrk 421 stands in contrast to EGRET observations (see paper by Lin et al.), which show no evidence for variability. © 1996. The American Astronomical Society. All rights reserved.

Registro:

Documento: Artículo
Título:Very high energy gamma-ray emission from the blazar Markarian 421
Autor:Schubnell, M.S.; 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.A.; Hillas, A.M.; Kerrick, A.D.; Lamb, R.C.; Meyer, D.I.; Mohanty, G.; Rose, J.; Rovero, A.C.; Sembroski, G.; Weekes, T.C.; Wilson, C.; Zweerink, J.
Filiación:University of Michigan, Ann Arbor, MI 48109, United States
University of Leeds, Leeds LS2 9JT, United Kingdom
Whipple Observatory, Harvard-Smithsonian CfA, Amado, AZ 85645, United States
Iowa State University, Ames, IA 50011, United States
St. Patrick's College, Maynooth, Co. Kildare, Ireland
University College Dublin, Belfield, Dublin 4, Ireland
Purdue University, West Lafayette, IN 47907, United States
Department of Physics and Geology, Northern Kentucky University, Highland Heights, KY 41099, United States
Instituto de Astronomía y Física del Espacio, C. C. 67, Suc. 28, 1428 Buenos Aires, Argentina
Palabras clave:BL Lacertae objects: individual (Markarian 421); Gamma rays: observations
Año:1996
Volumen:460
Número:2 PART I
Página de inicio:644
Página de fin:650
DOI: http://dx.doi.org/10.1086/176998
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v460_n2PARTI_p644_Schubnell

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Citas:

---------- APA ----------
Schubnell, M.S., Akerlof, C.W., Biller, S., Buckley, J., Carter-Lewis, D.A., Cawley, M.F., Chantell, M.,..., Zweerink, J. (1996) . Very high energy gamma-ray emission from the blazar Markarian 421. Astrophysical Journal, 460(2 PART I), 644-650.
http://dx.doi.org/10.1086/176998
---------- CHICAGO ----------
Schubnell, M.S., Akerlof, C.W., Biller, S., Buckley, J., Carter-Lewis, D.A., Cawley, M.F., et al. "Very high energy gamma-ray emission from the blazar Markarian 421" . Astrophysical Journal 460, no. 2 PART I (1996) : 644-650.
http://dx.doi.org/10.1086/176998
---------- MLA ----------
Schubnell, M.S., Akerlof, C.W., Biller, S., Buckley, J., Carter-Lewis, D.A., Cawley, M.F., et al. "Very high energy gamma-ray emission from the blazar Markarian 421" . Astrophysical Journal, vol. 460, no. 2 PART I, 1996, pp. 644-650.
http://dx.doi.org/10.1086/176998
---------- VANCOUVER ----------
Schubnell, M.S., Akerlof, C.W., Biller, S., Buckley, J., Carter-Lewis, D.A., Cawley, M.F., et al. Very high energy gamma-ray emission from the blazar Markarian 421. Astrophys. J. 1996;460(2 PART I):644-650.
http://dx.doi.org/10.1086/176998