Multiwavelength observations of the previously unidentified blazar RX J0648.7+1516

We report on the VERITAS discovery of very high energy (VHE) gamma-ray emission above 200GeV from the high-frequency-peaked BL Lac (HBL) object RXJ0648.7+1516 (GBJ0648+1516), associated with 1FGLJ0648.8+1516. The photon spectrum above 200GeV is fitted by a power law dN/dE = F 0(E/E 0)-Γ with a photo...

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Publicado:	2011
Materias:	gamma rays: galaxies
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v742_n2_p_Aliu http://hdl.handle.net/20.500.12110/paper_0004637X_v742_n2_p_Aliu
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_0004637X_v742_n2_p_Aliu
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spelling	paper:paper_0004637X_v742_n2_p_Aliu2023-06-08T14:29:03Z Multiwavelength observations of the previously unidentified blazar RX J0648.7+1516 gamma rays: galaxies We report on the VERITAS discovery of very high energy (VHE) gamma-ray emission above 200GeV from the high-frequency-peaked BL Lac (HBL) object RXJ0648.7+1516 (GBJ0648+1516), associated with 1FGLJ0648.8+1516. The photon spectrum above 200GeV is fitted by a power law dN/dE = F 0(E/E 0)-Γ with a photon index Γ of 4.4 ± 0.8stat± 0.3syst and a flux normalization F 0 of (2.3± 0.5stat± 1.2sys) × 10-11TeV-1cm-2 s-1 with E 0 = 300GeV. No VHE variability is detected during VERITAS observations of RXJ0648.7+1516 between 2010 March 4 and April 15. Following the VHE discovery, the optical identification and spectroscopic redshift were obtained using the Shane 3 m Telescope at the Lick Observatory, showing the unidentified object to be a BL Lac type with a redshift of z = 0.179. Broadband multiwavelength observations contemporaneous with the VERITAS exposure period can be used to subclassify the blazar as an HBL object, including data from the MDM observatory, Swift-UVOT, and X-Ray Telescope, and continuous monitoring at photon energies above 1GeV from the Fermi Large Area Telescope (LAT). We find that in the absence of undetected, high-energy rapid variability, the one-zone synchrotron self-Compton (SSC) model overproduces the high-energy gamma-ray emission measured by the Fermi-LAT over 2.3 years. The spectral energy distribution can be parameterized satisfactorily with an external-Compton or lepto-hadronic model, which have two and six additional free parameters, respectively, compared to the one-zone SSC model. © 2011. The American Astronomical Society. All rights reserved. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v742_n2_p_Aliu http://hdl.handle.net/20.500.12110/paper_0004637X_v742_n2_p_Aliu
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	gamma rays: galaxies
spellingShingle	gamma rays: galaxies Multiwavelength observations of the previously unidentified blazar RX J0648.7+1516
topic_facet	gamma rays: galaxies
description	We report on the VERITAS discovery of very high energy (VHE) gamma-ray emission above 200GeV from the high-frequency-peaked BL Lac (HBL) object RXJ0648.7+1516 (GBJ0648+1516), associated with 1FGLJ0648.8+1516. The photon spectrum above 200GeV is fitted by a power law dN/dE = F 0(E/E 0)-Γ with a photon index Γ of 4.4 ± 0.8stat± 0.3syst and a flux normalization F 0 of (2.3± 0.5stat± 1.2sys) × 10-11TeV-1cm-2 s-1 with E 0 = 300GeV. No VHE variability is detected during VERITAS observations of RXJ0648.7+1516 between 2010 March 4 and April 15. Following the VHE discovery, the optical identification and spectroscopic redshift were obtained using the Shane 3 m Telescope at the Lick Observatory, showing the unidentified object to be a BL Lac type with a redshift of z = 0.179. Broadband multiwavelength observations contemporaneous with the VERITAS exposure period can be used to subclassify the blazar as an HBL object, including data from the MDM observatory, Swift-UVOT, and X-Ray Telescope, and continuous monitoring at photon energies above 1GeV from the Fermi Large Area Telescope (LAT). We find that in the absence of undetected, high-energy rapid variability, the one-zone synchrotron self-Compton (SSC) model overproduces the high-energy gamma-ray emission measured by the Fermi-LAT over 2.3 years. The spectral energy distribution can be parameterized satisfactorily with an external-Compton or lepto-hadronic model, which have two and six additional free parameters, respectively, compared to the one-zone SSC model. © 2011. The American Astronomical Society. All rights reserved.
title	Multiwavelength observations of the previously unidentified blazar RX J0648.7+1516
title_short	Multiwavelength observations of the previously unidentified blazar RX J0648.7+1516
title_full	Multiwavelength observations of the previously unidentified blazar RX J0648.7+1516
title_fullStr	Multiwavelength observations of the previously unidentified blazar RX J0648.7+1516
title_full_unstemmed	Multiwavelength observations of the previously unidentified blazar RX J0648.7+1516
title_sort	multiwavelength observations of the previously unidentified blazar rx j0648.7+1516
publishDate	2011
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v742_n2_p_Aliu http://hdl.handle.net/20.500.12110/paper_0004637X_v742_n2_p_Aliu
_version_	1768546656642400256

Multiwavelength observations of the previously unidentified blazar RX J0648.7+1516

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