2023ApJ...950..152A

Query : 2023ApJ...950..152A

2023ApJ...950..152A - Astrophys. J., 950, 152 (2023/June-3)

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

ACHARYYA A., ADAMS C.B., ARCHER A., BANGALE P., BENBOW W., BRILL A., CHRISTIANSEN J.L., CHROMEY A.J., ERRANDO M., FALCONE A., FENG Q., FINLEY J.P., FOOTE G.M., FORTSON L., FURNISS A., GALLAGHER G., HANLON W., HANNA D., HERVET O., HINRICHS C.E., HOANG J., HOLDER J., JIN W., JOHNSON M.N., KAARET P., KERTZMAN M., KIEDA D., KLEINER T.K., KORZOUN N., KRENNRICH F., LANG M.J., LUNDY M., MAIER G., McGRATH C.E., MILLARD M.J., MILLIS J., MOONEY C.L., MORIARTY P., MUKHERJEE R., O'BRIEN S., ONG R.A., POHL M., PUESCHEL E., QUINN J., RAGAN K., REYNOLDS P.T., RIBEIRO D., ROACHE E., SADEH I., SADUN A.C., SAHA L., SANTANDER M., SEMBROSKI G.H., SHANG R., SPLETTSTOESSER M., TALLURI A.K., TUCCI J.V., VASSILIEV V.V., WILLIAMS D.A., WONG S.L. (The VERITAS Collaboration), HOVATTA T., JORSTAD S.G., KIEHLMANN S., LAHTEENMAKI A., LIODAKIS I., MARSCHER A.P., MAX-MOERBECK W., READHEAD A.C.S., REEVES R., SMITH P.S. and TORNIKOSKI M.

Abstract (from CDS):

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 13σ 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 τobs = 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.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Gamma-rays - High energy astrophysics - Blazars - Active galactic nuclei - Jets

Simbad objects: 12

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Number of rows : 12
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 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
3 Z 184-50 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2841 1
4 HS 1133+6753 BLL 11 36 30.0868711488 +67 37 04.345988232   18.19 17.45 15.3   ~ 161 1
5 RX J1224.4+2436 BLL 12 24 24.1862962656 +24 36 23.499792828   17.93 17.37     ~ 162 1
6 RX J1230.2+2518 BLL 12 30 14.0893292232 +25 18 07.136022996   15.6   14.78   ~ 177 1
7 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
8 3C 279 Bla 12 56 11.16657958 -05 47 21.5251510   18.01 17.75 15.87   ~ 3205 2
9 QSO B1959+650 BLL 19 59 59.8520303688 +65 08 54.652536492     12.8 11.21   ~ 699 2
10 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
11 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2541 1
12 PKS J2158-3013 BLL 21 58 52.0652249880 -30 13 32.118447792   13.36 13.09 12.62   ~ 1829 1

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