Multiwavelength Observations Of The Previously Unidentified Blazar RX J0648.7+1516

Aliu, E.

doi:10.1088/0004-637X/742/2/127

Multiwavelength Observations Of The Previously Unidentified Blazar RX J0648.7+1516

Journal Article · Tue Nov 15 00:00:00 EST 2011 · The Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/742/2/127· OSTI ID:1356783

Aliu, E. ^[1]

Columbia Univ., New York, NY (United States); et al.

We report on the VERITAS discovery of very-high-energy (VHE) gammaray emission above 200 GeV from the high-frequency-peaked BL Lac object RXJ0648.7+1516 (GBJ0648+1516), associated with 1FGL J0648.8+1516. The photon spectrum above 200 GeV is fit by a power law dN/dE = F0(E/E0)^-Γ with a photon index Γ of 4.4 ± 0.8stat ± 0.3syst and a flux normalization F0 of (2.3±0.5stat ±1.2sys)×10^-11 TeV^-1cm^-2s^-1 with E0 = 300 GeV. 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 sub-classify the blazar as a high-frequency-peaked BL Lac (HBL) object, including data from the MDM observatory, 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 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.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: The VERITAS Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1356783

Alternate ID(s):: OSTI ID: 22004599

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 742; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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