Journal article
Multiwavelength Observations of the Previously Unidentified Blazar RX J0648.7+1516
The Astrophysical journal, Vol.742(2), 127
10/26/2011
DOI: 10.1088/0004-637X/742/2/127
Abstract
We report on the VERITAS discovery of very-high-energy (VHE) gamma- ray
emission above 200 GeV from the high-frequency-peaked BL Lac object
RXJ0648.7+1516 (GBJ0648+1516), associated with 1FGLJ0648.8+1516. The photon
spectrum above 200 GeV is fit by a power law dN/dE = F0(E/E0)-{\Gamma} with a
photon index {\Gamma} of 4.4 {\pm} 0.8stat {\pm}0.3syst and a flux
normalization F0 of (2.3 {\pm}0.5stat {\pm} 1.2sys) {\times} 10-11 TeV-1cm-2s-1
with E0 = 300 GeV. No VHE vari- ability is detected during VERITAS observations
of RXJ0648.7+1516 between 2010 March 4 and April 15. Following the VHE
discovery, the optical identifica- tion 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 sub-classify the blazar as a high-frequency-peaked BL Lac (HBL)
object, including data from the MDM ob- servatory, Swift-UVOT and XRT, and
continuous monitoring at photon energies above 1 GeV 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 model (SSC) overproduces the
high-energy gamma-ray emission measured by the Fermi-LAT over 2.3 years. The
SED can be parameterized sat- isfactorily with an external-Compton or
lepto-hadronic model, which have two and six additional free parameters,
respectively, compared to the one-zone SSC model.
Details
- Title: Subtitle
- Multiwavelength Observations of the Previously Unidentified Blazar RX J0648.7+1516
- Creators
- E Aliu - Columbia UniversityT Aune - University of California, Santa CruzM Beilicke - Washington University in St. LouisW Benbow - Harvard UniversityM Böttcher - Ohio UniversityA Bouvier - University of California, Santa CruzS. M Bradbury - University of LeedsJ. H Buckley - Washington University in St. LouisV Bugaev - Washington University in St. LouisA Cannon - University College DublinA Cesarini - Ollscoil na Gaillimhe – University of GalwayL Ciupik - Adler PlanetariumM. P Connolly - Ollscoil na Gaillimhe – University of GalwayW Cui - Purdue University West LafayetteG DecerpritR Dickherber - Washington University in St. LouisC Duke - Grinnell CollegeM Errando - Columbia UniversityA Falcone - Pennsylvania State UniversityQ Feng - Purdue University West LafayetteG Finnegan - University of UtahL Fortson - University of MinnesotaA Furniss - University of California, Santa CruzN Galante - Harvard UniversityD Gall - University of IowaG. H Gillanders - Ollscoil na Gaillimhe – University of GalwayS Godambe - University of UtahS Griffin - McGill UniversityJ Grube - Adler PlanetariumG Gyuk - Adler PlanetariumD Hanna - McGill UniversityB Hivick - Ohio UniversityJ Holder - University of DelawareH Huan - University of ChicagoG HughesC. M Hui - University of UtahT. B Humensky - University of ChicagoP Kaaret - University of IowaN Karlsson - University of MinnesotaM Kertzman - DePauw UniversityD Kieda - University of UtahH Krawczynski - Washington University in St. LouisF Krennrich - Iowa State UniversityG MaierP Majumdar - University of California, Los AngelesS McArthur - Washington University in St. LouisA McCann - McGill UniversityP Moriarty - Galway-Mayo Institute of TechnologyR Mukherjee - Columbia UniversityR. A Ong - University of California, Los AngelesT Nelson - University of MinnesotaM Orr - Iowa State UniversityA. N Otte - University of California, Santa CruzN Park - University of ChicagoJ. S Perkins - University of Maryland, Baltimore CountyA Pichel - Institute of Astronomy and Space PhysicsM Pohl - University of PotsdamH ProkophJ Quinn - University College DublinK Ragan - McGill UniversityL. C Reyes - University of ChicagoP. T Reynolds - Cork Institute of TechnologyE Roache - Harvard UniversityH. J Rose - University of LeedsJ Ruppel - University of PotsdamD. B Saxon - University of DelawareG. H Sembroski - Purdue University West LafayetteC SkoleA. W Smith - Argonne National LaboratoryD Staszak - McGill UniversityG Tesic - McGill UniversityM Theiling - Harvard UniversityS Thibadeau - Washington University in St. LouisK Tsurusaki - University of IowaJ Tyler - McGill UniversityA Varlotta - Purdue University West LafayetteV. V Vassiliev - University of California, Los AngelesS. P Wakely - University of ChicagoT. C Weekes - Harvard UniversityA Weinstein - Iowa State UniversityD. A Williams - University of California, Santa CruzB Zitzer - Purdue University West LafayetteS Ciprini - University of PerugiaM Fumagalli - University of California, Santa CruzK Kaplan - Harvard UniversityD Paneque - Max Planck SocietyJ. X Prochaska - University of California, Santa CruzVERITAS Collaboration
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.742(2), 127
- DOI
- 10.1088/0004-637X/742/2/127
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- Institute of Physics (IOP)
- Language
- English
- Date published
- 10/26/2011
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199845302771
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