Browsing by Author "B. Berenji"

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    Search for Gamma-Ray Emission from Local Primordial Black Holes with the Fermi Large Area Telescope
    (2018-04-10) M. Ackermann; W. B. Atwood; L. Baldini; J. Ballet; G. Barbiellini; D. Bastieri; R. Bellazzini; B. Berenji; E. Bissaldi; R. D. Blandford; E. D. Bloom; R. Bonino; E. Bottacini; J. Bregeon; P. Bruel; R. Buehler; R. A. Cameron; R. Caputo; P. A. Caraveo; E. Cavazzuti; E. Charles; A. Chekhtman; C. C. Cheung; G. Chiaro; S. Ciprini; J. Cohen-Tanugi; J. Conrad; D. Costantin; F. D'Ammando; F. De Palma; S. W. Digel; N. Di Lalla; M. Di Mauro; L. Di Venere; C. Favuzzi; S. J. Fegan; W. B. Focke; A. Franckowiak; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; N. Giglietto; F. Giordano; M. Giroletti; D. Green; I. A. Grenier; L. Guillemot; S. Guiriec; D. Horan; G. Jóhannesson; C. Johnson; S. Kensei; D. Kocevski; M. Kuss; S. Larsson; L. Latronico; J. Li; F. Longo; F. Loparco; M. N. Lovellette; P. Lubrano; J. D. Magill; S. Maldera; D. Malyshev; A. Manfreda; M. N. Mazziotta; J. E. McEnery; M. Meyer; P. F. Michelson; W. Mitthumsiri; T. Mizuno; M. E. Monzani; E. Moretti; A. Morselli; I. V. Moskalenko; M. Negro; E. Nuss; R. Ojha; N. Omodei; M. Orienti; E. Orlando; J. F. Ormes; M. Palatiello; V. S. Paliya; D. Paneque; M. Persic; M. Pesce-Rollins; F. Piron; G. Principe; S. Rainò; R. Rando; M. Razzano; S. Razzaque; A. Reimer; O. Reimer; S. Ritz; M. Sánchez-Conde; C. Sgrò; 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 Science Institute Reykjavik; Agenzia Spaziale Italiana; Hiroshima University; California State University, Los Angeles; Deutsches Elektronen-Synchrotron (DESY); Osservatorio Astronomico di Trieste; Universite d'Orleans; Università di Pisa; Stockholms universitet; Alma Mater Studiorum Università di Bologna; Naval Research Laboratory; Universidad Autónoma de Madrid; Clemson University; Nordisk Institut for Teoretisk Atomtysik; Universitat Autònoma de Barcelona; Università degli Studi di Bari; Istituto Nazionale di Fisica Nucleare - INFN; University of Maryland; Institut National des Sciences de l'Univers; Università degli Studi di Trieste; George Mason University, Fairfax Campus; Università degli Studi di Napoli Federico II; University of Denver; Mahidol University; Università degli Studi di Torino; Max Planck Institut für Physik (Werner-Heisenberg-Institut); Medizinische Universitat Innsbruck; NASA Goddard Space Flight Center; Universite Paris 7- Denis Diderot; George Washington University; The Royal Institute of Technology (KTH); Friedrich-Alexander-Universität Erlangen-Nürnberg; University of Johannesburg; Università degli Studi di Padova; Oskar Klein Centre for Cosmoparticle Physics
    © 2018. The American Astronomical Society. All rights reserved. Black holes with masses below approximately 1015 g are expected to emit gamma-rays with energies above a few tens of MeV, which can be detected by the Fermi Large Area Telescope (LAT). Although black holes with these masses cannot be formed as a result of stellar evolution, they may have formed in the early universe and are therefore called primordial black holes (PBHs). Previous searches for PBHs have focused on either short-timescale bursts or the contribution of PBHs to the isotropic gamma-ray emission. We show that, in cases of individual PBHs, the Fermi-LAT is most sensitive to PBHs with temperatures above approximately 16 GeV and masses 6 ×1011 g, which it can detect out to a distance of about 0.03 pc. These PBHs have a remaining lifetime of months to years at the start of the Fermi mission. They would appear as potentially moving point sources with gamma-ray emission that become spectrally harder and brighter with time until the PBH completely evaporates. In this paper, we develop a new algorithm to detect the proper motion of gamma-ray point sources, and apply it to 318 unassociated point sources at a high galactic latitude in the third Fermi-LAT source catalog. None of the unassociated point sources with spectra consistent with PBH evaporation show significant proper motion. Using the nondetection of PBH candidates, we derive a 99% confidence limit on the PBH evaporation rate in the vicinity of Earth, PPBH < 7.2 × 103 pc-3 yr-1. This limit is similar to the limits obtained with ground-based gamma-ray observatories.
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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.