Spectroscopic Redshift of the Gamma-Ray Blazar B2 1215+30 from Ly alpha Emission
- We report on Cosmic Origin Spectrograph observations of the gamma-ray bright blazar B2 1215+30, collected in 2015 November. These observations allow for the confirmation of the source redshift from the detection of a Lyα emission feature at λ ~ 1374 Å. The emission feature places the source at a redshift of z = 0.1305 ± 0.003, confirming the source's ground-based spectral measurement. The gamma-ray emission of the source is discussed in the context of the source distance, required for the accurate reconstruction of the intrinsic gamma-ray emission taking the absorption by the extragalactic background light into account. The source distance is found to be low enough that the previously reported detection of an exceptional flaring event from B2 1215+30 in 2014 cannot be used to investigate opacity-specific spectral and variability characteristics introduced by possible ultra-high-energy cosmic-ray propagation.
Verfasserangaben: | Amy FurnissORCiD, Gabor WorseckORCiD, Michele FumagalliORCiD, Caitlin A. JohnsonORCiD, David A. WilliamsORCiD, P. Pontrelli, J. Xavier ProchaskaORCiD |
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DOI: | https://doi.org/10.3847/1538-3881/aaf28b |
ISSN: | 0004-6256 |
ISSN: | 1538-3881 |
Titel des übergeordneten Werks (Englisch): | The astronomical journal |
Verlag: | IOP Publ. Ltd. |
Verlagsort: | Bristol |
Publikationstyp: | Wissenschaftlicher Artikel |
Sprache: | Englisch |
Datum der Erstveröffentlichung: | 07.01.2019 |
Erscheinungsjahr: | 2019 |
Datum der Freischaltung: | 19.04.2021 |
Freies Schlagwort / Tag: | galaxies: individual (B2 1215+30); galaxies:distances and redshifts; gamma rays: galaxies; ultraviolet: galaxies |
Band: | 157 |
Ausgabe: | 2 |
Seitenanzahl: | 4 |
Fördernde Institution: | Space Telescope Institute [HST-GO-13651]; Science and Technology Facilities CouncilScience & Technology Facilities Council (STFC) [ST/P000541/1]; European Research Council (ERC) under the European Council (ERC) [757535]; U.S. National Science FoundationNational Science Foundation (NSF) [PHY-1307311, PHY-1707432] |
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften |
Peer Review: | Referiert |
Publikationsweg: | Open Access / Hybrid Open-Access |
Lizenz (Englisch): | Creative Commons - Namensnennung 3.0 Unported |