Gamma-ray variability of BL lacs at E>300 GeV

We report on observations of Mrk 421 and Mrk 501 at E γ >300 GeV during the 1995 and 1996 seasons. A multiwavelength observing campaign on Mrk 421 in the period 1995 April 20 to May 5 indicates correlations in the γ-ray, X-ray, extreme ultraviolet, and optical wavelengths. Dramatic outbursts of T...

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Published inAdvances in space research Vol. 21; no. 1; pp. 101 - 107
Main Authors Buckley, J.H, Akerlof, C.W, Biller, S, Boyle, P.J, Breslin, A.C, Carter-Lewis, D.A, Cantanese, M, Cawley, M.F, Connaughton, V, Fegan, D.J, Finley, J.P, Gaidos, J, Bussons Gordo, J, Hillas, A.M, Krennrich, F, Lamb, R.C, Lessard, R, Masterson, C, McEnery, J.E, Mohanty, G, Moriarty, P, Quinn, J, Rodgers, A.J, Rose, H.J, Samuelson, F, Schubnell, M.S, Sembroski, G, Srinivasan, R, Weekes, T.C, Wilson, C, Zweerink, J
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 1998
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Abstract We report on observations of Mrk 421 and Mrk 501 at E γ >300 GeV during the 1995 and 1996 seasons. A multiwavelength observing campaign on Mrk 421 in the period 1995 April 20 to May 5 indicates correlations in the γ-ray, X-ray, extreme ultraviolet, and optical wavelengths. Dramatic outbursts of TeV γ-rays were detected on two occasions in May of 1996 where the γ-ray flux reached the highest levels ever recorded (a factor of ∼20 greater than typical levels) with variability timescales ≲1hr. Together with the multiwavelength correlations these provide serious constraints on the Doppler factor ( δ ≳ 9.9), the size and location of the emission region ( R ≲ 10 −4pc) and the mechanism responsible for the γ-ray emission.
AbstractList We report on observations of Mrk 421 and Mrk 501 at E γ >300 GeV during the 1995 and 1996 seasons. A multiwavelength observing campaign on Mrk 421 in the period 1995 April 20 to May 5 indicates correlations in the γ-ray, X-ray, extreme ultraviolet, and optical wavelengths. Dramatic outbursts of TeV γ-rays were detected on two occasions in May of 1996 where the γ-ray flux reached the highest levels ever recorded (a factor of ∼20 greater than typical levels) with variability timescales ≲1hr. Together with the multiwavelength correlations these provide serious constraints on the Doppler factor ( δ ≳ 9.9), the size and location of the emission region ( R ≲ 10 −4pc) and the mechanism responsible for the γ-ray emission.
Author Masterson, C
Cawley, M.F
Schubnell, M.S
Boyle, P.J
Akerlof, C.W
Gaidos, J
Sembroski, G
Carter-Lewis, D.A
Zweerink, J
Moriarty, P
Finley, J.P
Cantanese, M
Connaughton, V
Krennrich, F
McEnery, J.E
Lamb, R.C
Fegan, D.J
Samuelson, F
Weekes, T.C
Rose, H.J
Mohanty, G
Quinn, J
Buckley, J.H
Breslin, A.C
Biller, S
Bussons Gordo, J
Rodgers, A.J
Srinivasan, R
Hillas, A.M
Wilson, C
Lessard, R
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CitedBy_id crossref_primary_10_1086_345352
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Snippet We report on observations of Mrk 421 and Mrk 501 at E γ >300 GeV during the 1995 and 1996 seasons. A multiwavelength observing campaign on Mrk 421 in the...
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