Browsing by Author "S. Kumar"

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    VERITAS and Fermi-LAT Observations of TeV Gamma-Ray Sources Discovered by HAWC in the 2HWC Catalog
    (2018-10-10) A. U. Abeysekara; A. Archer; W. Benbow; R. Bird; R. Brose; M. Buchovecky; J. H. Buckley; V. Bugaev; A. J. Chromey; M. P. Connolly; W. Cui; M. K. Daniel; A. Falcone; Q. Feng; J. P. Finley; L. Fortson; A. Furniss; M. Hütten; D. Hanna; O. Hervet; J. Holder; G. Hughes; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; M. Kertzman; D. Kieda; M. Krause; F. Krennrich; S. Kumar; M. J. Lang; T. T.Y. Lin; S. McArthur; P. Moriarty; R. Mukherjee; S. O'Brien; R. A. Ong; A. N. Otte; N. Park; A. Petrashyk; M. Pohl; E. Pueschel; J. Quinn; K. Ragan; P. T. Reynolds; G. T. Richards; E. Roache; C. Rulten; I. Sadeh; M. Santander; G. H. Sembroski; K. Shahinyan; I. Sushch; J. Tyler; S. P. Wakely; A. Weinstein; R. M. Wells; P. Wilcox; A. Wilhelm; D. A. Williams; T. J. Williamson; B. Zitzer; S. Abdollahi; M. Ajello; L. Baldini; G. Barbiellini; D. Bastieri; R. Bellazzini; B. Berenji; E. Bissaldi; R. D. Blandford; R. Bonino; E. Bottacini; T. J. Brandt; P. Bruel; R. Buehler; R. A. Cameron; R. Caputo; P. A. Caraveo; D. Castro; E. Cavazzuti; E. Charles; G. Chiaro; S. Ciprini; J. Cohen-Tanugi; D. Costantin; S. Cutini; F. D'Ammando; F. De Palma; N. Di Lalla; M. Di Mauro; L. Di Venere; A. Dominguez; C. Favuzzi; S. J. Fegan; A. Franckowiak; Y. Fukazawa; S. Funk; P. Fusco; Istituto Nazionale di Fisica Nucleare, Sezione di Trieste; Istituto Nazionale di Fisica Nucleare, Sezione di Perugia; Istituto Nazionale di Fisica Nucleare, Sezione di Bari; Istituto Nazionale di Fisica Nucleare, Sezione di Torino; Istituto Nazionale di Fisica Nucleare, Sezione di Pisa; Istituto Nazionale Di Fisica Nucleare, Sezione di Padova; Laboratoire Univers et Particules de Montpellier; Laboratoire Leprince-Ringuet; Kavli Institute for Particle Astrophysics and Cosmology; Santa Cruz Institute for Particle Physics; INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna; INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan; University of Wisconsin-Madison; Agenzia Spaziale Italiana; California State University, East Bay; Hiroshima University; California State University, Los Angeles; Deutsches Elektronen-Synchrotron (DESY); Columbia University in the City of New York; University of Minnesota Twin Cities; Università di Pisa; Alma Mater Studiorum Università di Bologna; University of California, Los Angeles; Universidad Complutense de Madrid; Clemson University; The Enrico Fermi Institute; University of Utah; The University of Alabama; Tsinghua University; University of Iowa; Università degli Studi di Bari; Universität Potsdam; Harvard-Smithsonian Center for Astrophysics; Georgia Institute of Technology; Università degli Studi di Trieste; Università degli Studi di Napoli Federico II; Università degli Studi di Torino; Washington University in St. Louis; Barnard College; Purdue University; National University of Ireland Galway; NASA Goddard Space Flight Center; DePauw University; University College Dublin; Iowa State University; McGill University; Pennsylvania State University; Cork Institute of Technology; Friedrich-Alexander-Universität Erlangen-Nürnberg; Bartol Research Institute; Università degli Studi di Padova
    © 2018. The American Astronomical Society. All rights reserved. The High Altitude Water Cherenkov (HAWC) collaboration recently published their 2HWC catalog, listing 39 very high energy (VHE; >100 GeV) gamma-ray sources based on 507 days of observation. Among these, 19 sources are not associated with previously known teraelectronvolt (TeV) gamma-ray sources. We have studied 14 of these sources without known counterparts with VERITAS and Fermi-LAT. VERITAS detected weak gamma-ray emission in the 1 TeV-30 TeV band in the region of DA 495, a pulsar wind nebula coinciding with 2HWC J1953+294, confirming the discovery of the source by HAWC. We did not find any counterpart for the selected 14 new HAWC sources from our analysis of Fermi-LAT data for energies higher than 10 GeV. During the search, we detected gigaelectronvolt (GeV) gamma-ray emission coincident with a known TeV pulsar wind nebula, SNR G54.1+0.3 (VER J1930+188), and a 2HWC source, 2HWC J1930+188. The fluxes for isolated, steady sources in the 2HWC catalog are generally in good agreement with those measured by imaging atmospheric Cherenkov telescopes. However, the VERITAS fluxes for SNR G54.1+0.3, DA 495, and TeV J2032+4130 are lower than those measured by HAWC, and several new HAWC sources are not detected by VERITAS. This is likely due to a change in spectral shape, source extension, or the influence of diffuse emission in the source region.