Multiwavelength observations of the blazar BL Lacertae: A new fast TeV γ-ray flare

Q. Feng; S. G. Jorstad; A. P. Marscher; M. L. Lister; Y. Y. Kovalev; A. B. Pushkarev; T. Savolainen; I. Agudo; S. N. Molina; J. L. Gomez; V. M. Larionov; G. A. Borman; A. A. Mokrushina; P. S. Smith

Multiwavelength observations of the blazar BL Lacertae: A new fast TeV γ-ray flare

Q. Feng, S. G. Jorstad, A. P. Marscher, M. L. Lister, Y. Y. Kovalev, A. B. Pushkarev, T. Savolainen, I. Agudo, S. N. Molina, J. L. Gomez, V. M. Larionov, G. A. Borman, A. A. Mokrushina, P. S. Smith

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Abstract

Observations of fast TeV γ-ray flares from blazars reveal the extreme compactness of emitting regions in blazar jets. Combined with very-long-baseline radio interferometry measurements, they probe the structure and emission mechanism of the jet. We report on a fast TeV γ-ray flare from BL Lacertae observed by VERITAS, with a rise time of about 2.3 hours and a decay time of about 36 minutes. The peak flux at >200 GeV measured with the 4-minute binned light curve is (4.2 ±0.6) × 10^-6 photons m^-2 s^-1, or ∼180% the Crab Nebula flux. Variability in GeV γ-ray, X-ray, and optical flux, as well as in optical and radio polarization was observed around the time of the TeV γ-ray flare. A possible superluminal knot was identified in the VLBA observations at 43 GHz. The flare constrains the size of the emitting region, and is consistent with several theoretical models with stationary shocks.

Original language	English
Number of pages	8
Journal	Proceedings of Science
Volume	Part F135186
Publication status	Published - 2017
MoE publication type	A4 Conference publication
Event	International Cosmic Ray Conference - Busan, Korea, Republic of Duration: 10 Jul 2017 → 20 Jul 2017 Conference number: 35

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https://pos.sissa.it/301/648/

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Feng, Q., 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., & Smith, P. S. (2017). Multiwavelength observations of the blazar BL Lacertae: A new fast TeV γ-ray flare. Proceedings of Science, Part F135186. https://pos.sissa.it/301/648/

@article{e760d53a1eda4d1592e4cba0101e7de1,

title = "Multiwavelength observations of the blazar BL Lacertae: A new fast TeV γ-ray flare",

abstract = "Observations of fast TeV γ-ray flares from blazars reveal the extreme compactness of emitting regions in blazar jets. Combined with very-long-baseline radio interferometry measurements, they probe the structure and emission mechanism of the jet. We report on a fast TeV γ-ray flare from BL Lacertae observed by VERITAS, with a rise time of about 2.3 hours and a decay time of about 36 minutes. The peak flux at >200 GeV measured with the 4-minute binned light curve is (4.2 ±0.6) × 10-6 photons m-2 s-1, or ∼180% the Crab Nebula flux. Variability in GeV γ-ray, X-ray, and optical flux, as well as in optical and radio polarization was observed around the time of the TeV γ-ray flare. A possible superluminal knot was identified in the VLBA observations at 43 GHz. The flare constrains the size of the emitting region, and is consistent with several theoretical models with stationary shocks.",

author = "Q. Feng and Jorstad, {S. G.} and Marscher, {A. P.} and Lister, {M. L.} and Kovalev, {Y. Y.} and Pushkarev, {A. B.} and T. Savolainen and I. Agudo and Molina, {S. N.} and Gomez, {J. L.} and Larionov, {V. M.} and Borman, {G. A.} and Mokrushina, {A. A.} and Smith, {P. S.}",

year = "2017",

language = "English",

volume = "Part F135186",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Scuola Internazionale Superiore di Studi Avanzati (SISSA)",

note = "International Cosmic Ray Conference, ICRC ; Conference date: 10-07-2017 Through 20-07-2017",

}

TY - JOUR

T1 - Multiwavelength observations of the blazar BL Lacertae

T2 - International Cosmic Ray Conference

AU - Feng, Q.

AU - Jorstad, S. G.

AU - Marscher, A. P.

AU - Lister, M. L.

AU - Kovalev, Y. Y.

AU - Pushkarev, A. B.

AU - Savolainen, T.

AU - Agudo, I.

AU - Molina, S. N.

AU - Gomez, J. L.

AU - Larionov, V. M.

AU - Borman, G. A.

AU - Mokrushina, A. A.

AU - Smith, P. S.

N1 - Conference code: 35

PY - 2017

Y1 - 2017

N2 - Observations of fast TeV γ-ray flares from blazars reveal the extreme compactness of emitting regions in blazar jets. Combined with very-long-baseline radio interferometry measurements, they probe the structure and emission mechanism of the jet. We report on a fast TeV γ-ray flare from BL Lacertae observed by VERITAS, with a rise time of about 2.3 hours and a decay time of about 36 minutes. The peak flux at >200 GeV measured with the 4-minute binned light curve is (4.2 ±0.6) × 10-6 photons m-2 s-1, or ∼180% the Crab Nebula flux. Variability in GeV γ-ray, X-ray, and optical flux, as well as in optical and radio polarization was observed around the time of the TeV γ-ray flare. A possible superluminal knot was identified in the VLBA observations at 43 GHz. The flare constrains the size of the emitting region, and is consistent with several theoretical models with stationary shocks.

AB - Observations of fast TeV γ-ray flares from blazars reveal the extreme compactness of emitting regions in blazar jets. Combined with very-long-baseline radio interferometry measurements, they probe the structure and emission mechanism of the jet. We report on a fast TeV γ-ray flare from BL Lacertae observed by VERITAS, with a rise time of about 2.3 hours and a decay time of about 36 minutes. The peak flux at >200 GeV measured with the 4-minute binned light curve is (4.2 ±0.6) × 10-6 photons m-2 s-1, or ∼180% the Crab Nebula flux. Variability in GeV γ-ray, X-ray, and optical flux, as well as in optical and radio polarization was observed around the time of the TeV γ-ray flare. A possible superluminal knot was identified in the VLBA observations at 43 GHz. The flare constrains the size of the emitting region, and is consistent with several theoretical models with stationary shocks.

UR - http://www.scopus.com/inward/record.url?scp=85045375598&partnerID=8YFLogxK

M3 - Conference article

SN - 1824-8039

VL - Part F135186

JO - Proceedings of Science

JF - Proceedings of Science

Y2 - 10 July 2017 through 20 July 2017

ER -

Multiwavelength observations of the blazar BL Lacertae: A new fast TeV γ-ray flare

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Multiwavelength observations of the blazar BL Lacertae: A new fast TeV γ-ray flare

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