2018ApJ...856...95A

Query : 2018ApJ...856...95A

2018ApJ...856...95A - Astrophys. J., 856, 95-95 (2018/April-1)

Multiwavelength observations of the blazar BL Lacertae: a new fast TeV gamma-ray flare.

ABEYSEKARA A.U., BENBOW W., BIRD R., BRANTSEG T., BROSE R., BUCHOVECKY M., BUCKLEY J.H., BUGAEV V., CONNOLLY M.P., CUI W., DANIEL M.K., FALCONE A., FENG Q., FINLEY J.P., FORTSON L., FURNISS A., GILLANDERS G.H., GUNAWARDHANA I., HUTTEN M., HANNA D., HERVET O., HOLDER J., HUGHES G., HUMENSKY T.B., JOHNSON C.A., KAARET P., KAR P., KERTZMAN M., KRENNRICH F., LANG M.J., LIN T.T.Y., McARTHUR S., MORIARTY P., MUKHERJEE R., O'BRIEN S., ONG R.A., OTTE A.N., PARK N., PETRASHYK A., POHL M., PUESCHEL E., QUINN J., RAGAN K., REYNOLDS P.T., RICHARDS G.T., ROACHE E., RULTEN C., SADEH I., SANTANDER M., SEMBROSKI G.H., SHAHINYAN K., WAKELY S.P., WEINSTEIN A., WELLS R.M., WILCOX P., WILLIAMS D.A., ZITZER B., JORSTAD S.G., MARSCHER A.P., LISTER M.L., KOVALEV Y.Y., PUSHKAREV A.B., SAVOLAINEN T., AGUDO I., MOLINA S.N., GOMEZ J.L., LARIONOV V.M., BORMAN G.A., MOKRUSHINA A.A., TORNIKOSKI M., LAHTEENMAKI A., CHAMANI W., ENESTAM S., KIEHLMANN S., HOVATTA T., SMITH P.S., PONTRELLI P. (The VERITAS Collaboration)

Abstract (from CDS):

Combined with measurements made by very-long-baseline interferometry, the observations of fast TeV gamma-ray flares probe the structure and emission mechanism of blazar jets. However, only a handful of such flares have been detected to date, and only within the last few years have these flares been observed from lower-frequency-peaked BL Lac objects and flat-spectrum radio quasars. We report on a fast TeV gamma-ray flare from the blazar BL Lacertae observed by the Very Energetic Radiation Imaging Telescope Array System (VERITAS). with a rise time of ∼2.3 hr and a decay time of ∼36 min. The peak flux above 200 GeV is (4.2 ± 0.6) x 10–6 photon m–2 s–1 measured with a 4-minute-binned light curve, corresponding to ∼180% of the flux that is observed from the Crab Nebula above the same energy threshold. Variability contemporaneous with the TeV gamma-ray flare was observed in GeV gamma-ray, X-ray, and optical flux, as well as in optical and radio polarization. Additionally, a possible moving emission feature with superluminal apparent velocity was identified in Very Long Baseline Array observations at 43 GHz, potentially passing the radio core of the jet around the time of the gamma-ray flare. We discuss the constraints on the size, Lorentz factor, and location of the emitting region of the flare, and the interpretations with several theoretical models that invoke relativistic plasma passing stationary shocks.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): BL Lacertae objects: individual: (BL Lacertae , VER J2202+422) - galaxies: active

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
2 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
3 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
4 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
5 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2541 1
6 NVSS J215122+415632 Bla 21 51 23.0062752136 +41 56 32.429491556           ~ 20 1
7 VER J2202+422 gam 22 02 37.0 +42 15 25           ~ 2 0
8 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2397 1

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