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

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

doi:10.1016/S0273-1177(97)00620-0

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

J. H. Buckley
, C. W. Akerlof
, S. Biller
, P. J. Boyle
, A. C. Breslin
, D. A. Carter-Lewis
, M. Cantanese
, M. F. Cawley
, V. Connaughton
, D. J. Fegan
, J. P. Finley
, J. Gaidos
, J. Bussons Gordo
, A. M. Hillas
, F. Krennrich
, R. C. Lamb
, R. Lessard
, C. Masterson
, J. E. McEnery
, G. Mohanty

P. Moriarty, J. Quinn, A. J. Rodgers, H. J. Rose, F. Samuelson, M. S. Schubnell, G. Sembroski, R. Srinivasan, T. C. Weekes, C. Wilson, J. Zweerink

Department of Physics

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

We report on observations of Mrk 421 and Mrk 501 at Eγ >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.

Original language	English
Pages (from-to)	101-107
Number of pages	7
Journal	Advances in Space Research
Volume	21
Issue number	1-2
DOIs	https://doi.org/10.1016/S0273-1177(97)00620-0
State	Published - 1998

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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., ... Zweerink, J. (1998). Gamma-ray variability of BL Lacs at E>300 GeV. Advances in Space Research, 21(1-2), 101-107. https://doi.org/10.1016/S0273-1177(97)00620-0

@article{da1dcdf5dc1040779c7f5a4cb3f3ae82,

title = "Gamma-ray variability of BL Lacs at E>300 GeV",

abstract = "We report on observations of Mrk 421 and Mrk 501 at Eγ >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 = "Buckley, \{J. H.\} and Akerlof, \{C. W.\} and S. Biller and Boyle, \{P. J.\} and Breslin, \{A. C.\} and Carter-Lewis, \{D. A.\} and M. Cantanese and Cawley, \{M. F.\} and V. Connaughton and Fegan, \{D. J.\} and Finley, \{J. P.\} and J. Gaidos and \{Bussons Gordo\}, J. and Hillas, \{A. M.\} and F. Krennrich and Lamb, \{R. C.\} and R. Lessard and C. Masterson and McEnery, \{J. E.\} and G. Mohanty and P. Moriarty and J. Quinn and Rodgers, \{A. J.\} and Rose, \{H. J.\} and F. Samuelson and Schubnell, \{M. S.\} and G. Sembroski and R. Srinivasan and Weekes, \{T. C.\} and C. Wilson and J. Zweerink",

year = "1998",

doi = "10.1016/S0273-1177(97)00620-0",

language = "English",

volume = "21",

pages = "101--107",

journal = "Advances in Space Research",

issn = "0273-1177",

number = "1-2",

}

Buckley, JH, Akerlof, CW, Biller, S, Boyle, PJ, Breslin, AC, Carter-Lewis, DA, Cantanese, M, Cawley, MF, Connaughton, V, Fegan, DJ, Finley, JP, Gaidos, J, Bussons Gordo, J, Hillas, AM, Krennrich, F, Lamb, RC, Lessard, R, Masterson, C, McEnery, JE, Mohanty, G, Moriarty, P, Quinn, J, Rodgers, AJ, Rose, HJ, Samuelson, F, Schubnell, MS, Sembroski, G, Srinivasan, R, Weekes, TC, Wilson, C & Zweerink, J 1998, 'Gamma-ray variability of BL Lacs at E>300 GeV', Advances in Space Research, vol. 21, no. 1-2, pp. 101-107. https://doi.org/10.1016/S0273-1177(97)00620-0

TY - JOUR

T1 - Gamma-ray variability of BL Lacs at E>300 GeV

AU - Buckley, J. H.

AU - Akerlof, C. W.

AU - Biller, S.

AU - Boyle, P. J.

AU - Breslin, A. C.

AU - Carter-Lewis, D. A.

AU - Cantanese, M.

AU - Cawley, M. F.

AU - Connaughton, V.

AU - Fegan, D. J.

AU - Finley, J. P.

AU - Gaidos, J.

AU - Bussons Gordo, J.

AU - Hillas, A. M.

AU - Krennrich, F.

AU - Lamb, R. C.

AU - Lessard, R.

AU - Masterson, C.

AU - McEnery, J. E.

AU - Mohanty, G.

AU - Moriarty, P.

AU - Quinn, J.

AU - Rodgers, A. J.

AU - Rose, H. J.

AU - Samuelson, F.

AU - Schubnell, M. S.

AU - Sembroski, G.

AU - Srinivasan, R.

AU - Weekes, T. C.

AU - Wilson, C.

AU - Zweerink, J.

PY - 1998

Y1 - 1998

N2 - We report on observations of Mrk 421 and Mrk 501 at Eγ >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.

AB - We report on observations of Mrk 421 and Mrk 501 at Eγ >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.

UR - https://www.scopus.com/pages/publications/0000457137

U2 - 10.1016/S0273-1177(97)00620-0

DO - 10.1016/S0273-1177(97)00620-0

M3 - Article

AN - SCOPUS:0000457137

SN - 0273-1177

VL - 21

SP - 101

EP - 107

JO - Advances in Space Research

JF - Advances in Space Research

IS - 1-2

ER -

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

Abstract

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