Multiwavelength observations and modeling of 1ES 1959+650 in a low flux state

VERITAS Collaboration: E. Aliu , S. Archambault , T. Arlen , T. Aune , M. Beilicke , W. Benbow , R. Bird , M. Boettcher

show 76 more authors

A. Bouvier V. Bugaev K. Byrum A. Cesarini L. Ciupik E. Collins-Hughes M. P. Connolly W. Cui R. Dickherber C. Duke J. Dumm M. Errando A. Falcone S. Federici Q. Feng J. P. Finley G. Finnegan L. Fortson A. Furniss N. Galante D. Gall G. H. Gillanders S. Griffin J. Grube G. Gyuk D. Hanna J. Holder G. Hughes T. B. Humensky P. Kaaret M. Kertzman Y. Khassen D. Kieda H. Krawczynski F. Krennrick M. J. Lang A. S. Madhavan G. Maier P. Majumdar S. McArthur A. McCann P. Moriarty R. Mukherjee T. Nelson A. O'Faolain de Bhroithe R. A. Ong M. Orr A. N. Otte N. Park J. S. Perkins A. Pichel M. Pohl A. Popkow H. Prokoph J. Quinn K. Ragan L. C. Reyes P. T. Reynolds E. Roache D. B. Saxon M. Schroedter G. H. Sembroski C. Skole A. W. Smith D. Staszak I. Telezhinsky M. Theiling J. Tyler A. Varlotta V. V. Vassiliev S. P. Wakely T. C. Weekes A. Weinstein R. Welsing D. A. Williams B. Zitzer

Authors on Pith no claims yet

classification 🌌 astro-ph.HE

keywords veritasfluxobservationssourcex-raydataenergyfermi-lat

0 comments

read the original abstract

We report on the VERITAS observations of the high-frequency peaked BL Lac object 1ES 1959+650 in the period 2007-2011. This source is detected at TeV energies by VERITAS at 16.4 standard deviation (sigma) significance in 7.6 hours of observation in a low flux state. A multiwavelength spectral energy distribution (SED) is constructed from contemporaneous data from VERITAS, Fermi-LAT, RXTE PCA, and Swift UVOT. Swift XRT data is not included in the SED due to a lack of simultaneous observations with VERITAS. In contrast to the orphan gamma-ray flare exhibited by this source in 2002, the X-ray flux of the source is found to vary by an order of magnitude, while other energy regimes exhibit less variable emission. A quasi-equilibrium synchrotron self-Compton model with an additional external radiation field is used to describe three SEDs corresponding to the lowest, highest, and average X-ray states. The variation in the X-ray spectrum is modeled by changing the electron injection spectral index, with minor adjustments of the kinetic luminosity in electrons. This scenario produces small-scale flux variability of order >~2 in the HE (E>1 MeV) and VHE (E>100 GeV) gamma-ray regimes, which is corroborated by the Fermi-LAT, VERITAS, and Whipple 10m telescope light curves.

This paper has not been read by Pith yet.

discussion (0)

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

Tracking down the broadband polarimetric properties of PG 1553+113
astro-ph.HE 2026-05 unverdicted novelty 4.0

New IXPE X-ray polarimetry and optical monitoring of PG 1553+113 reveal variable polarization and a large EVPA swing, supporting jet models with related but non-co-spatial X-ray and optical emission regions.