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The TeV energy spectrum of Markarian 421 measured in a high flaring state

Konopelko, A.
Cui, W.
Duke, C.
Finley, J. P.

Publication date

January 2008

DOI

Publisher

Purdue University (bepress)

ISSN

0004-637X

Language

English

Citation count (estimate)

5

Abstract

The BL Lac object (blazar) Mrk 421 was observed during its outburst in 2004 April with the Whipple 10 m telescope for a total of about 24.5 hr. The measured gamma-ray rate varied substantially over the range from 4 to 10 minute(-1) and eventually exceeded the steady gamma-ray rate of the Crab Nebula (standard candle) by a factor of 3. The overall significance of the gamma-ray signal exceeded 70 sigma and the total number of excess events was more than 10,000. This unique Mrk 421 outburst enabled the measurement of a high-quality spectrum of very high energy gamma-rays in a high state of emission. This spectrum is a power law and i...

Extracted data

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Lamb, R.C.
Lessard, R.W.
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Mohanty, G.
Quinn, J.
Rodgers, A.J.
Rose, H.J.
Schubnell, M.S.
Sembroski, G.H.
Weekes, T.C.
Wilson, C.W.
Zweerink, J.

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Carter-Lewis, D. A.
Catanese, M.
Cawley, M. F.
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Finley, John P.
Gaidos, J. A.
Hillas, A. M.
Krennrich, F.
Lamb, R. C.
Lessard, R. W.
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Mohanty, G.
Quinn, J.
Rodgers, A. J.
Rose, H. J.
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Sembroski, G.
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Weekes, T. C.
Wilson, C.

December 1997

We present the gamma-ray spectrum of the BL Lacertae object, Markarian 421, above 500 GeV during its...

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Zweerink, J.
Akerlof, C. W.
Biller, S. D.
Boyle, P.
Buckley, J. H.
Burdett, A.
Bussons Gordo, J.
Carter-Lewis, D. A.
Catanese, M.
Cawley, M. F.
Fegan, D. J.
Finley, John P.
Gaidos, J. A.
Hillas, A. M.
Krennrich, F.
Lamb, R. C.
Lessard, R. W.
McEnery, J. E.
Mohanty, G.
Quinn, J.
Rodgers, A. J.
Rose, H. J.
Samuelson, F. W.
Schubnell, S.
Sembroski, G.
Srinivasan, R.
Weekes, T. C.
Wilson, C.

December 1997

We present the gamma-ray spectrum of the BL Lacertae object, Markarian 421, above 500 GeV during its...

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Bertsch, D. L.
Aller, H. D.
Bruhweiler, F.
Carter-Lewis, D. A.
Cawley, M. F.
Akerlof, C. W.
Aller, M. F.
Cheng, K.-P.
Macomb, D. J.
Buckley, J. H.

August 1995

A TeV flare from the BL Lac object Mrk 421 was detected in May of 1994 by the Whipple Observatory ai...

The Energy Spectrum of the Blazar Markarian 421 Above 130 GeV

Carson, J E
Kildea, J
Ong, R A
Ball, J
Bramel, D A
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Driscoll, D
Fortin, P
Gingrich, D M
Hanna, D S
Lindner, T
Müller, C
Jarvis, A
Mukherjee, R
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Scalzo, R A
Williams, D A
Zweerink, J

December 2006

Markarian 421 (Mrk 421) was the first blazar detected at gamma-ray energies above 300 GeV, and it re...

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Schubnell, M S
Akerlof, Carl W
Buckley, S B J
Carter-Lewis, D A
Cawley, M F
Chantell, M C
Connaughton, V
Fegan, D J
Fennell, S
Gaidos, J A
Hillas, A M
Meyer, D I
Mohanty, G B
Rose, J
Rovero, A C
Sembroski, G H
Weekes, T C
Wilson, C
Zweerink, J A

February 1996

Very high energy gamma-ray emission from the BL Lac object Markarian 421 has been detected over thre...

Discovery of spectral variability of markarian 421 at t[clc]e[/clc]v energies

Krennrich, F.
Bond, I. H.
Bradbury, S. M.
Buckley, J. H.
Carter-Lewis, D. A.
Cui, W.
de la Calle Perez, I.
Fegan, D. J.
Fegan, S. J.
Finley, J. P.
Gaidos, J. A.
Gibbs, K.
Gillanders, G. H.
Hall, T. A.
Hillas, A. M.
Holder, J.
Horan, D.
Jordan, M.
Kertzman, M.
Kieda, D.

August 2018

The detection of spectral variability of the gamma-ray blazar Mrk 421 at TeV energies is reported. O...

Tev Observations of the Variability and Spectrum of Markarian 421

McEnery, JE
Bond, IH
Boyle, PJ
Bradbury, SM
Breslin, AC
Buckley, JH
Burdett, AM
Gordo, J Bussons
Carter-Lewis, DA
Catanese, M
Cawley, MF
Fegan, DJ
Finley, JP
Gaidos, J
Hall, A
Hillas, AM
Krennrich, F
Lamb, RC
Lessard, RW
Masterson, C
Mohanty, G
Moriarty, P
Quinn, J
Rodgers, AJ
Rose, HJ
Samuelson, FW
Sembroski, GH
Srinivasan, R
Weekes, TC
Zweerink, J

June 1997

Markarian 421 was the first extragalactic source to be detected with high statistical certainty at T...

The gamma-ray energy spectrum of the active galaxy Markarian 421

Zweerink, Jeffrey Alan

January 1997

This is a study of the very high energy gamma-ray emission from Markarian 421. The data were taken b...

Detection of Multi-TeV Emission from Markarian 421

Krennrich, F.
Akerlof, C.W.
Buckley, J.H.
Burdett, A.M.
Carter-Lewis, D.A.
Cawley, Michael F.
Catanese, M.
Connaughton, V.
Fegan, D.J.
Finley, J.P.
Gaidos, J.A.
Lamb, R.C.
Lessard, R.W.
McEnery, J.E.
Mohanty, G.
Quinn, J.
Rodgers, A.J.
Rose, H.J.
Schubnell, M.S.
Sembroski, G.H.
Weekes, T.C.
Wilson, C.W.
Zweerink, J.

January 1997

Gamma rays with energies exceeding 5 ± 1.5 TeV have been detected from Markarian 421 using the Whipp...

Observation of gamma-rays greater than 10 TeV from Markarian 421

September 2002

We have observed Markarian 421 in January and March 2001 with the CANGAROO-II imaging Cherenkov tele...

Correlative studies of astrophysical sources of very high and ultra high energy gamma-rays

Akerlof, Carl W.

January 1993

During the period of this contract, June 1, 1991 to November 14, 1992, the major results of our rese...

Multiwavelength Observations of Markarian 421 During a TeV/X-Ray Flare

Macomb, D. J.
Akerlof, C. W.
Aller, H. D.
Aller, M. F.
Bertsch, D. L.
Kafatos, Menas

January 1995

A Te V flare from the BL Lac object Mrk 421 was detected in May of 1994 by the Whipple Observatory a...