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DOAJ Open Access 2023

VERITAS Discovery of Very High Energy Gamma-Ray Emission from S3 1227+25 and Multiwavelength Observations

A. Acharyya C. B. Adams A. Archer P. Bangale W. Benbow +67 lainnya
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Abstrak

We report the detection of very high energy gamma-ray emission from the blazar S3 1227+25 (VER J1230+253) with the Very Energetic Radiation Imaging Telescope Array System (VERITAS). VERITAS observations of the source were triggered by the detection of a hard-spectrum GeV flare on 2015 May 15 with the Fermi-Large Area Telescope (LAT). A combined 5 hr VERITAS exposure on May 16 and 18 resulted in a strong 13 σ detection with a differential photon spectral index, Γ = 3.8 ± 0.4, and a flux level at 9% of the Crab Nebula above 120 GeV. This also triggered target-of-opportunity observations with Swift, optical photometry, polarimetry, and radio measurements, also presented in this work, in addition to the VERITAS and Fermi-LAT data. A temporal analysis of the gamma-ray flux during this period finds evidence of a shortest variability timescale of τ _obs = 6.2 ± 0.9 hr, indicating emission from compact regions within the jet, and the combined gamma-ray spectrum shows no strong evidence of a spectral cutoff. An investigation into correlations between the multiwavelength observations found evidence of optical and gamma-ray correlations, suggesting a single-zone model of emission. Finally, the multiwavelength spectral energy distribution is well described by a simple one-zone leptonic synchrotron self-Compton radiation model.

Topik & Kata Kunci

Astrophysics

Penulis (72)

A

A. Acharyya

C

C. B. Adams

A

A. Archer

P

P. Bangale

W

W. Benbow

A

A. Brill

J

J. L. Christiansen

A

A. J. Chromey

M

M. Errando

A

A. Falcone

Q

Q. Feng

J

J. P. Finley

G

G. M. Foote

L

L. Fortson

A

A. Furniss

G

G. Gallagher

W

W. Hanlon

D

D. Hanna

O

O. Hervet

C

C. E. Hinrichs

J

J. Hoang

J

J. Holder

W

W. Jin

M

M. N. Johnson

P

P. Kaaret

M

M. Kertzman

D

D. Kieda

T

T. K. Kleiner

N

N. Korzoun

F

F. Krennrich

M

M. J. Lang

M

M. Lundy

G

G. Maier

C

C. E McGrath

M

M. J. Millard

J

J. Millis

C

C. L. Mooney

P

P. Moriarty

R

R. Mukherjee

S

S. O’Brien

R

R. A. Ong

M

M. Pohl

E

E. Pueschel

J

J. Quinn

K

K. Ragan

P

P. T. Reynolds

D

D. Ribeiro

E

E. Roache

I

I. Sadeh

A

A. C. Sadun

L

L. Saha

M

M. Santander

G

G. H. Sembroski

R

R. Shang

M

M. Splettstoesser

A

A. K. Talluri

J

J. V. Tucci

V

V. V. Vassiliev

D

D. A. Williams

S

S. L. Wong

T

The VERITAS Collaboration

T

Talvikki Hovatta

S

Svetlana G. Jorstad

S

Sebastian Kiehlmann

A

Anne Lähteenmäki

I

Ioannis Liodakis

A

Alan P. Marscher

W

Walter Max-Moerbeck

A

Anthony C. S. Readhead

R

Rodrigo Reeves

P

Paul S. Smith

M

Merja Tornikoski

Format Sitasi

APA MLA BibTeX
Acharyya, A., Adams, C.B., Archer, A., Bangale, P., Benbow, W., Brill, A. et al. (2023). VERITAS Discovery of Very High Energy Gamma-Ray Emission from S3 1227+25 and Multiwavelength Observations. https://doi.org/10.3847/1538-4357/acd2d0

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Informasi Jurnal
Tahun Terbit
2023
Sumber Database
DOAJ
DOI
10.3847/1538-4357/acd2d0
Akses
Open Access ✓