Blazars at the Cosmic Dawn
| dc.contributor.author | PALIYA, Vaidehi S. | |
| dc.contributor.author | AJELLO, M. | |
| dc.contributor.author | CAO, H.-M. | |
| dc.contributor.author | GIROLETTI, M. | |
| dc.contributor.author | KAUR, Amanpreet | |
| dc.contributor.author | MADEJSKI, Greg | |
| hal.structure.identifier | Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG] | |
| dc.contributor.author | LOTT, Benoit | |
| dc.contributor.author | HARTMANN, D. | |
| dc.date.issued | 2020 | |
| dc.description.abstractEn | The uncharted territory of the high-redshift (z ≳ 3) universe holds the key to understanding the evolution of quasars. In an attempt to identify the most extreme members of the quasar population, that is, blazars, we have carried out a multiwavelength study of a large sample of radio-loud quasars beyond z = 3. Our sample consists of nine γ-ray-detected blazars and 133 candidate blazars selected based on the flatness of their soft X-ray spectra (0.3–10 keV photon index ≤1.75), including 15 with Nuclear Spectroscopic Telescope Array (NuSTAR) observations. The application of the likelihood profile stacking technique reveals that the high-redshift blazars are faint γ-ray emitters with steep spectra. The high-redshift blazars host massive black holes () and luminous accretion disks ( erg s−1). Their broadband spectral energy distributions are found to be dominated by high-energy radiation, indicating their jets are among the most luminous ones. Focusing on the sources exhibiting resolved X-ray jets (as observed with the Chandra satellite), we find the bulk Lorentz factor to be larger with respect to other z > 3 blazars, indicating faster moving jets. We conclude that the presented list of high-redshift blazars may act as a reservoir for follow-up observations, such as with NuSTAR, to understand the evolution of relativistic jets at the dawn of the universe. | |
| dc.language.iso | en | |
| dc.title.en | Blazars at the Cosmic Dawn | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.3847/1538-4357/ab9c1a | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph] | |
| dc.identifier.arxiv | 2006.01857 | |
| bordeaux.journal | Astrophys.J. | |
| bordeaux.page | 177 | |
| bordeaux.volume | 897 | |
| bordeaux.issue | 2 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-02886879 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-02886879v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astrophys.J.&rft.date=2020&rft.volume=897&rft.issue=2&rft.spage=177&rft.epage=177&rft.au=PALIYA,%20Vaidehi%20S.&AJELLO,%20M.&CAO,%20H.-M.&GIROLETTI,%20M.&KAUR,%20Amanpreet&rft.genre=article |
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