NuSTAR observations of heavily obscured quasars at z ~ 0.5
| Autor: | Roberto J. Assef, Franz E. Bauer, Michael Koss, C. J. Hailey, Stephanie M. LaMassa, William W. Craig, Fiona A. Harrison, David M. Alexander, C. M. Urry, Brian W. Grefenstette, Finn Erland Christensen, Daniel Stern, Mislav Baloković, Stacy H. Teng, George B. Lansbury, S. E. Boggs, A. Del Moro, Poshak Gandhi, Ryan C. Hickox, William W. Zhang, Martin Elvis, James Mullaney, W. N. Brandt, James Aird, Birong Luo, David R. Ballantyne |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
High energy
010504 meteorology & atmospheric sciences active [Galaxies] media_common.quotation_subject Astrophysics::High Energy Astrophysical Phenomena galaxies. [X-rays] FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Lower energy Luminosity 0103 physical sciences Absorption (electromagnetic radiation) 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences media_common Physics High Energy Astrophysical Phenomena (astro-ph.HE) Astrophysics::Instrumentation and Methods for Astrophysics Astronomy and Astrophysics Quasar Astrophysics - Astrophysics of Galaxies Black hole 13. Climate action Space and Planetary Science Sky Astrophysics of Galaxies (astro-ph.GA) Spectral energy distribution Astrophysics - High Energy Astrophysical Phenomena |
| Zdroj: | Lansbury, G B, Alexander, D M, Del Moro, A, Gandhi, P, Assef, R J, Stern, D, Aird, J, Ballantyne, D R, Balokovic´, M, Bauer, F E, Boggs, S E, Brandt, W N, Christensen, F E, Craig, W W, Elvis, M, Grefenstette, B W, Hailey, C J, Harrison, F A, Hickox, R C, Koss, M, LaMassa, S M, Luo, B, Mullaney, J R, Teng, S H, Urry, C M & Zhang, W W 2014, ' NuSTAR observations of heavily obscured quasars at z ~ 0.5 ', Astrophysical Journal, vol. 785, no. 1, 17 . https://doi.org/10.1088/0004-637X/785/1/17 Astrophysical journal, 2014, Vol.785(1), pp.17 [Peer Reviewed Journal] |
| Popis: | We present NuSTAR hard X-ray (3-79 keV) observations of three Type 2 quasars at z ~ 0.4-0.5, optically selected from the Sloan Digital Sky Survey (SDSS). Although the quasars show evidence for being heavily obscured Compton-thick systems on the basis of the 2-10 keV to [OIII] luminosity ratio and multiwavelength diagnostics, their X-ray absorbing column densities (N_H) are poorly known. In this analysis: (1) we study X-ray emission at >10 keV, where X-rays from the central black hole are relatively unabsorbed, in order to better constrain N_H; (2) we further characterize the physical properties of the sources through broad-band near-UV to mid-IR spectral energy distribution (SED) analyses. One of the quasars is detected with NuSTAR at >8 keV with a no-source probability of 10 pages, 6 figures, 3 tables. Accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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