Multiwavelength observations of markarian 421 during a tev/x-ray flare

D. J. Macomb; C. W. Akerlof; H. D. Aller; M. F. Aller; D. L. Bertsch; F. Bruhweiler; J. H. Buckley; D. A. Carter-Lewis; M. F. Cawley; K. P. Cheng; C. Dermer; D. J. Fegan; J. A. Gaidos; W. K. Gear; C. R. Hall; R. C. Hartman; A. M. Hillas; M. Kafatos; A. D. Kerrick; D. A. Kniffen; Y. Kondo; H. Kubo; R. C. Lamb; F. Makino; K. Makishima; A. Marscher; J. McEnery; I. M. McHardy; D. I. Meyer; E. M. Moore; E. Ramos; E. I. Robson; H. J. Rose; M. S. Schubnell; G. Sembroski; J. A. Stevens; T. Takahashi; M. Tashiro; T. C. Weekes; C. Wilson; J. Zweerink

doi:10.1086/309646

Multiwavelength observations of markarian 421 during a tev/x-ray flare

D. J. Macomb
, C. W. Akerlof
, H. D. Aller
, M. F. Aller
, D. L. Bertsch
, F. Bruhweiler
, J. H. Buckley
, D. A. Carter-Lewis
, M. F. Cawley
, K. P. Cheng
, C. Dermer
, D. J. Fegan
, J. A. Gaidos
, W. K. Gear
, C. R. Hall
, R. C. Hartman
, A. M. Hillas
, M. Kafatos
, A. D. Kerrick
, D. A. Kniffen

Y. Kondo, H. Kubo, R. C. Lamb, F. Makino, K. Makishima, A. Marscher, J. McEnery, I. M. McHardy, D. I. Meyer, E. M. Moore, E. Ramos, E. I. Robson, H. J. Rose, M. S. Schubnell, G. Sembroski, J. A. Stevens, T. Takahashi, M. Tashiro, T. C. Weekes, C. Wilson, J. Zweerink

Physics Department

University of Michigan, Ann Arbor
NASA Goddard Space Flight Center
Catholic University of America
Harvard-Smithsonian CfA
Iowa State University
St. Patrick's College
Naval Research Laboratory
University College Dublin
Purdue University
Royal Observatory
University of Leeds
George Mason University
Hampden-Sydney College
The University of Tokyo
JAXA Institute of Space and Astronautical Science
Boston University
University of Southampton
University of Hawai'i at Mānoa
University of Central Lancashire

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

149 Scopus citations

Abstract

A TeV flare from the BL Lac object Mrk 421 was detected in May of 1994 by the Whipple Observatory air Cherenkov experiment during which the flux above 250 GeV increased by nearly an order of magnitude over a 2-day period. Contemporaneous observations by ASCA showed the X-ray flux to be in a very high state. We present these results, combined with the first ever simultaneous or nearly simultaneous observations at GeV gamma-ray, UV, IR, mm, and radio energies for this nearest BL Lac object. While the GeV gamma-ray flux increased slightly, there is little evidence for variability comparable to that seen at TeV and X-ray energies. other wavelengths show even less variability. This provides important constraints on the emission mechanisms at work. We present the multiwavelength spectrum of this gamma-ray blazar for both quiescent and flaring states and discuss the data in terms of current models of blazar emission.

Original language	English
Pages (from-to)	L99-L103
Journal	Astrophysical Journal
Volume	449
Issue number	2
DOIs	https://doi.org/10.1086/309646
State	Published - 20 Aug 1995

Keywords

BL Lacertae objects: General
BL Lacertae objects: Individual (Markarian 421)

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10.1086/309646

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Macomb, D. J., Akerlof, C. W., Aller, H. D., Aller, M. F., Bertsch, D. L., Bruhweiler, F., Buckley, J. H., Carter-Lewis, D. A., Cawley, M. F., Cheng, K. P., Dermer, C., Fegan, D. J., Gaidos, J. A., Gear, W. K., Hall, C. R., Hartman, R. C., Hillas, A. M., Kafatos, M., Kerrick, A. D., ... Zweerink, J. (1995). Multiwavelength observations of markarian 421 during a tev/x-ray flare. Astrophysical Journal, 449(2), L99-L103. https://doi.org/10.1086/309646

@article{4f91fd5f5cfb4f15b83d1fc359527327,

title = "Multiwavelength observations of markarian 421 during a tev/x-ray flare",

abstract = "A TeV flare from the BL Lac object Mrk 421 was detected in May of 1994 by the Whipple Observatory air Cherenkov experiment during which the flux above 250 GeV increased by nearly an order of magnitude over a 2-day period. Contemporaneous observations by ASCA showed the X-ray flux to be in a very high state. We present these results, combined with the first ever simultaneous or nearly simultaneous observations at GeV gamma-ray, UV, IR, mm, and radio energies for this nearest BL Lac object. While the GeV gamma-ray flux increased slightly, there is little evidence for variability comparable to that seen at TeV and X-ray energies. other wavelengths show even less variability. This provides important constraints on the emission mechanisms at work. We present the multiwavelength spectrum of this gamma-ray blazar for both quiescent and flaring states and discuss the data in terms of current models of blazar emission.",

keywords = "BL Lacertae objects: General, BL Lacertae objects: Individual (Markarian 421)",

author = "Macomb, \{D. J.\} and Akerlof, \{C. W.\} and Aller, \{H. D.\} and Aller, \{M. F.\} and Bertsch, \{D. L.\} and F. Bruhweiler and Buckley, \{J. H.\} and Carter-Lewis, \{D. A.\} and Cawley, \{M. F.\} and Cheng, \{K. P.\} and C. Dermer and Fegan, \{D. J.\} and Gaidos, \{J. A.\} and Gear, \{W. K.\} and Hall, \{C. R.\} and Hartman, \{R. C.\} and Hillas, \{A. M.\} and M. Kafatos and Kerrick, \{A. D.\} and Kniffen, \{D. A.\} and Y. Kondo and H. Kubo and Lamb, \{R. C.\} and F. Makino and K. Makishima and A. Marscher and J. McEnery and McHardy, \{I. M.\} and Meyer, \{D. I.\} and Moore, \{E. M.\} and E. Ramos and Robson, \{E. I.\} and Rose, \{H. J.\} and Schubnell, \{M. S.\} and G. Sembroski and Stevens, \{J. A.\} and T. Takahashi and M. Tashiro and Weekes, \{T. C.\} and C. Wilson and J. Zweerink",

year = "1995",

month = aug,

day = "20",

doi = "10.1086/309646",

language = "English",

volume = "449",

pages = "L99--L103",

number = "2",

}

Macomb, DJ, Akerlof, CW, Aller, HD, Aller, MF, Bertsch, DL, Bruhweiler, F, Buckley, JH, Carter-Lewis, DA, Cawley, MF, Cheng, KP, Dermer, C, Fegan, DJ, Gaidos, JA, Gear, WK, Hall, CR, Hartman, RC, Hillas, AM, Kafatos, M, Kerrick, AD, Kniffen, DA, Kondo, Y, Kubo, H, Lamb, RC, Makino, F, Makishima, K, Marscher, A, McEnery, J, McHardy, IM, Meyer, DI, Moore, EM, Ramos, E, Robson, EI, Rose, HJ, Schubnell, MS, Sembroski, G, Stevens, JA, Takahashi, T, Tashiro, M, Weekes, TC, Wilson, C & Zweerink, J 1995, 'Multiwavelength observations of markarian 421 during a tev/x-ray flare', Astrophysical Journal, vol. 449, no. 2, pp. L99-L103. https://doi.org/10.1086/309646

TY - JOUR

T1 - Multiwavelength observations of markarian 421 during a tev/x-ray flare

AU - Macomb, D. J.

AU - Akerlof, C. W.

AU - Aller, H. D.

AU - Aller, M. F.

AU - Bertsch, D. L.

AU - Bruhweiler, F.

AU - Buckley, J. H.

AU - Carter-Lewis, D. A.

AU - Cawley, M. F.

AU - Cheng, K. P.

AU - Dermer, C.

AU - Fegan, D. J.

AU - Gaidos, J. A.

AU - Gear, W. K.

AU - Hall, C. R.

AU - Hartman, R. C.

AU - Hillas, A. M.

AU - Kafatos, M.

AU - Kerrick, A. D.

AU - Kniffen, D. A.

AU - Kondo, Y.

AU - Kubo, H.

AU - Lamb, R. C.

AU - Makino, F.

AU - Makishima, K.

AU - Marscher, A.

AU - McEnery, J.

AU - McHardy, I. M.

AU - Meyer, D. I.

AU - Moore, E. M.

AU - Ramos, E.

AU - Robson, E. I.

AU - Rose, H. J.

AU - Schubnell, M. S.

AU - Sembroski, G.

AU - Stevens, J. A.

AU - Takahashi, T.

AU - Tashiro, M.

AU - Weekes, T. C.

AU - Wilson, C.

AU - Zweerink, J.

PY - 1995/8/20

Y1 - 1995/8/20

N2 - A TeV flare from the BL Lac object Mrk 421 was detected in May of 1994 by the Whipple Observatory air Cherenkov experiment during which the flux above 250 GeV increased by nearly an order of magnitude over a 2-day period. Contemporaneous observations by ASCA showed the X-ray flux to be in a very high state. We present these results, combined with the first ever simultaneous or nearly simultaneous observations at GeV gamma-ray, UV, IR, mm, and radio energies for this nearest BL Lac object. While the GeV gamma-ray flux increased slightly, there is little evidence for variability comparable to that seen at TeV and X-ray energies. other wavelengths show even less variability. This provides important constraints on the emission mechanisms at work. We present the multiwavelength spectrum of this gamma-ray blazar for both quiescent and flaring states and discuss the data in terms of current models of blazar emission.

AB - A TeV flare from the BL Lac object Mrk 421 was detected in May of 1994 by the Whipple Observatory air Cherenkov experiment during which the flux above 250 GeV increased by nearly an order of magnitude over a 2-day period. Contemporaneous observations by ASCA showed the X-ray flux to be in a very high state. We present these results, combined with the first ever simultaneous or nearly simultaneous observations at GeV gamma-ray, UV, IR, mm, and radio energies for this nearest BL Lac object. While the GeV gamma-ray flux increased slightly, there is little evidence for variability comparable to that seen at TeV and X-ray energies. other wavelengths show even less variability. This provides important constraints on the emission mechanisms at work. We present the multiwavelength spectrum of this gamma-ray blazar for both quiescent and flaring states and discuss the data in terms of current models of blazar emission.

KW - BL Lacertae objects: General

KW - BL Lacertae objects: Individual (Markarian 421)

UR - https://www.scopus.com/pages/publications/79960833943

U2 - 10.1086/309646

DO - 10.1086/309646

M3 - Article

AN - SCOPUS:79960833943

SN - 0004-637X

VL - 449

SP - L99-L103

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

Multiwavelength observations of markarian 421 during a tev/x-ray flare

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Keywords

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