Gamma-Ray Blazars within the First 2 Billion Years

Ackermann M, Ajello M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Gonzalez JB, Bellazzini R, Bissaldi E, Blandford RD, Bloom ED, Bonino R, Bottacini E, Bregeon J, Bruel P, Buehler R, Buson S, Cameron RA, Caragiulo M, Caraveo PA, Cavazzuti E, Cecchi C, Cheung CC, Chiang J, Chiaro G, Ciprini S, Conrad J, Costantin D, Costanza F, Cutini S, D'Ammando F, De Palma F, Desiante R, Digel SW, Di Lalla N, Di Mauro M, Di Venere L, Dominguez A, Drell PS, Favuzzi C, Fegan SJ, Ferrara EC, Finke J, Focke WB, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Giglietto N, Giordano F, Giroletti M, Green D, Grenier IA, Guillemot L, Guiriec S, Hartmann DH, Hays E, Horan D, Jogler T, Johannesson G, Johnson AS, Kuss M, La Mura G, Larsson S, Latronico L, Li J, Longo F, Loparco F, Lovellette MN, Lubrano P, Magill JD, Maldera S, Manfreda A, Marcotulli L, Mazziotta MN, Michelson PF, Mirabal N, Mitthumsiri W, Mizuno T, Monzani ME, Morselli A, Moskalenko IV, Negro M, Nuss E, Ohsugi T, Ojha R, Omodei N, Orienti M, Orlando E, Ormes JF, Paliya VS, Paneque D, Perkins JS, Persic M, Pesce-Rollins M, Piron F, Porter TA, Principe G, Raino S, Rando R, Rani B, Razzano M, Razzaque S, Reimer A, Reimer O, Romani RW, Sgro C, Simone D, Siskind EJ, Spada F, Spandre G, Spinelli P, Stalin CS, Stawarz L, Suson DJ, Takahashi M, Tanaka K, Thayer JB, Thompson DJ, Torres DF, Torresi E, Tosti G, Troja E, Vianello G, Wood KS (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Book Volume: 837

Journal Issue: 1

DOI: 10.3847/2041-8213/aa5fff

Abstract

The detection of high-redshift (z > 3) blazars enables the study of the evolution of the most luminous relativistic jets over cosmic time. More importantly, high-redshift blazars tend to host massive black holes and can be used to constrain the space density of heavy black holes in the early universe. Here, we report the first detection with the Fermi-Large Area Telescope of five gamma-ray-emitting blazars beyond z. =. 3.1, more distant than any blazars previously detected in.-rays gamma Among these five objects, NVSS J151002+570243 is now the most distant known gamma-ray-emitting blazar at z =. 4.31. These objects have steeply falling gamma-ray spectral energy distributions (SEDs), and. those that have been observed in X-rays have a very hard X-ray spectrum, both typical of powerful blazars. Their Compton dominance ( ratio of the inverse Compton to synchrotron peak luminosities) is also very large (>20). All of these properties place these objects among the most extreme members of the blazar population. Their optical spectra and the modeling of their optical-UV SEDs confirm that these objects harbor massive black holes (MBH similar to 10(8-10) M circle dot 8 10). We find that, at z approximate to 4, the space density of >10(9)M circle dot black holes hosted in radio-loud and radio-quiet active galactic nuclei are similar, implying that radio-loudness may play a key role in rapid black hole growth in the early universe.

Authors with CRIS profile

Involved external institutions

Deutsches Elektronen-Synchrotron DESY Germany (DE) National Aeronautics and Space Administration (NASA) United States (USA) (US) Clemson University United States (USA) (US) Stanford University United States (USA) (US) University of Pisa / Università di Pisa (UniPi) Italy (IT) National Institute for Nuclear Physics / Istituto Nazionale di Fisica Nucleare (INFN) Italy (IT) National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF) Italy (IT) University of Padua / Universita degli Studi di Padova Italy (IT) University of Johannesburg South Africa (ZA) Stockholm University / Stockholms universitet Sweden (SE) U.S. Naval Research Laboratory United States (USA) (US) NYCB Real-Time Computing, Inc. United States (USA) (US) Italian Space Agency / Agenzia Spaziale Italiana (ASI) Italy (IT) École Polytechnique - Université Paris-Saclay France (FR) Hiroshima University Japan (JP) University of Orléans / Université d'Orléans France (FR) University of Iceland (UI) / Háskóli Íslands Iceland (IS) University of Paris 7 - Denis Diderot / Université Paris VII Denis Diderot France (FR) University of Montpellier / Université Montpellier France (FR) University of Maryland United States (USA) (US) Purdue University Northwest / Purdue University Calumet United States (USA) (US) Max-Planck-Institut für Physik (Werner-Heisenberg-Institut, MPP) / Max Planck Institute for Physics Germany (DE) Jagiellonian University / Uniwersytet Jagielloński (UJ) Poland (PL) Indian Institute of Astrophysics India (IN) University of Denver United States (USA) (US) Mahidol University / มหาวิทยาลัยมหิดล Thailand (TH) Spanish National Research Council / Consejo Superior de Investigaciones Científicas (CSIC) Spain (ES) Praxis, Inc. United States (USA) (US) AlbaNova University Centre / Kungliga Tekniska Högskolan AlbaNova Universitetscentrum Sweden (SE)

How to cite

APA:

Ackermann, M., Ajello, M., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D.,... Wood, K.S. (2017). Gamma-Ray Blazars within the First 2 Billion Years. Astrophysical Journal Letters, 837(1). https://doi.org/10.3847/2041-8213/aa5fff

MLA:

Ackermann, Markus, et al. "Gamma-Ray Blazars within the First 2 Billion Years." Astrophysical Journal Letters 837.1 (2017).

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