Publication:
CONTEMPORANEOUS BROADBAND OBSERVATIONS of THREE HIGH-REDSHIFT BL LAC OBJECTS

Issued Date

2016-03-20

Resource Type

Article

ISSN

15384357
0004637X

DOI

10.3847/0004-637X/820/1/72

Other identifier(s)

2-s2.0-84961657918

Rights

Mahidol University

Rights Holder(s)

SCOPUS

Bibliographic Citation

Astrophysical Journal. Vol.820, No.1 (2016)

Suggested Citation

M. Ackermann, M. Ajello, H. An, L. Baldini, G. Barbiellini, D. Bastieri, R. Bellazzini, E. Bissaldi, R. D. Blandford, R. Bonino, J. Bregeon, R. J. Britto, P. Bruel, R. Buehler, G. A. Caliandro, R. A. Cameron, M. Caragiulo, P. A. Caraveo, E. Cavazzuti, C. Cecchi, E. Charles, A. Chekhtman, G. Chiaro, S. Ciprini, J. Cohen-Tanugi, F. Costanza, S. Cutini, F. D'Ammando, A. De Angelis, F. De Palma, R. Desiante, M. Di Mauro, L. Di Venere, A. Dominguez, P. S. Drell, C. Favuzzi, S. J. Fegan, E. C. Ferrara, J. Finke, P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, F. Giordano, M. Giroletti, D. Green, I. A. Grenier, S. Guiriec, D. Horan, G. Jóhannesson, M. Katsuragawa, M. Kuss, S. Larsson, L. Latronico, J. Li, L. Li, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, J. Magill, S. Maldera, A. Manfreda, M. Mayer, M. N. Mazziotta, P. F. Michelson, N. Mirabal, W. Mitthumsiri, T. Mizuno, M. E. Monzani, A. Morselli, I. V. Moskalenko, M. Negro, E. Nuss CONTEMPORANEOUS BROADBAND OBSERVATIONS of THREE HIGH-REDSHIFT BL LAC OBJECTS. Astrophysical Journal. Vol.820, No.1 (2016). doi:10.3847/0004-637X/820/1/72 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/43583

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Title

CONTEMPORANEOUS BROADBAND OBSERVATIONS of THREE HIGH-REDSHIFT BL LAC OBJECTS

Author(s)

M. Ackermann
 M. Ajello
 H. An
 L. Baldini
 G. Barbiellini
 D. Bastieri
 R. Bellazzini
 E. Bissaldi
 R. D. Blandford
 R. Bonino
 J. Bregeon
 R. J. Britto
 P. Bruel
 R. Buehler
 G. A. Caliandro
 R. A. Cameron
 M. Caragiulo
 P. A. Caraveo
 E. Cavazzuti
 C. Cecchi
 E. Charles
 A. Chekhtman
 G. Chiaro
 S. Ciprini
 J. Cohen-Tanugi
 F. Costanza
 S. Cutini
 F. D'Ammando
 A. De Angelis
 F. De Palma
 R. Desiante
 M. Di Mauro
 L. Di Venere
 A. Dominguez
 P. S. Drell
 C. Favuzzi
 S. J. Fegan
 E. C. Ferrara
 J. Finke
 P. Fusco
 F. Gargano
 D. Gasparrini
 N. Giglietto
 F. Giordano
 M. Giroletti
 D. Green
 I. A. Grenier
 S. Guiriec
 D. Horan
 G. Jóhannesson
 M. Katsuragawa
 M. Kuss
 S. Larsson
 L. Latronico
 J. Li
 L. Li
 F. Longo
 F. Loparco
 M. N. Lovellette
 P. Lubrano
 J. Magill
 S. Maldera
 A. Manfreda
 M. Mayer
 M. N. Mazziotta
 P. F. Michelson
 N. Mirabal
 W. Mitthumsiri
 T. Mizuno
 M. E. Monzani
 A. Morselli
 I. V. Moskalenko
 M. Negro
 E. Nuss

Other Contributor(s)

Deutsche Elektronen-Synchrotron
 Clemson University
 Kavli Institute for Particle Astrophysics and Cosmology
 Università di Pisa
 Istituto Nazionale di Fisica Nucleare, Roma
 Universita degli Studi di Trieste
 Istituto Nazionale Di Fisica Nucleare, Sezione di Padova
 Università degli Studi di Padova
 Istituto Nazionale Di Fisica Nucleare, Sezione di Pisa
 Università degli Studi di Torino
 Laboratoire Univers et Particules de Montpellier
 University of Johannesburg
 Laboratoire Leprince-Ringuet
 Consorzio Interuniversitario per la Fisica Spaziale (CIFS)
 Università degli Studi di Bari
 INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
 Agenzia Spaziale Italiana
 Universita degli Studi di Perugia
 George Mason University, Fairfax Campus
 Osservatorio Astronomico di Roma
 Istituto Di Radioastronomia, Bologna
 Alma Mater Studiorum Università di Bologna
 Universita degli Studi di Udine
 Università degli Studi di Napoli Federico II
 NASA Goddard Space Flight Center
 Naval Research Laboratory
 University of Maryland
 Institut de Recherche sur les Lois Fondamentales de l'Univers
 University Science Institute Reykjavik
 JAXA Institute of Space and Astronautical Science
 The Royal Institute of Technology (KTH)
 Oskar Klein Centre for Cosmoparticle Physics
 Universitat Autònoma de Barcelona
 Mahidol University
 Hiroshima University
 Max Planck Institut fur Physik (Werner-Heisenberg-Institut)
 Medizinische Universitat Innsbruck
 Max Planck Institut fur extraterrestrische Physik
 NYCB Realtime Computing Inc.
 Jet Propulsion Laboratory, California Institute of Technology
 Institucio Catalana de Recerca I Estudis Avancats

Abstract

© 2016. The American Astronomical Society. All rights reserved. We have collected broadband spectral energy distributions (SEDs) of three BL Lac objects 3FGL J0022.1-1855 (z = 0.689), 3FGL J0630.9-2406 (z≳ 1.239), and 3FGL J0811.2-7529 (z = 0.774), detected by Fermi with relatively flat gigaelectronvolt spectra. By observing simultaneously in the near-infrared to hard X-ray band, we can well characterize the high end of the synchrotron component of the SED. Thus, fitting the SEDs to synchro-Compton models of the dominant emission from the relativistic jet, we can constrain the underlying particle properties and predict the shape of the gigaelectronvolt Compton component. Standard extragalactic background light (EBL) models explain the high-energy absorption well, with poorer fits for high-ultraviolet models. The fits show clear evidence for EBL absorption in the Fermi spectrum of our highest-redshift source 3FGL J0630.9-2406. While synchrotron self-Compton models adequately describe the SEDs, the situation may be complicated by possible external Compton components. For 3FGL J0811.2-7529, we also discover a nearby serendipitous source in the X-ray data, which is almost certainly another lower synchrotron peak frequency (vpksy) BL Lac, that may contribute flux in the Fermi band. Since our sources are unusual high-luminosity, moderate vpksy BL Lacs, we compare these quantities and the Compton dominance, the ratio of peak inverse Compton to peak synchrotron luminosities (LpkIC/Lpksy), with those of the full Fermi BL Lac population.

Keyword(s)

Earth and Planetary Sciences

Availability

URI

https://repository.li.mahidol.ac.th/handle/20.500.14594/43583

Collections

Scopus 2016-2017