The $\textit{Nu}$STAR Serendipitous Survey: The 40-month Catalog and the Properties of the Distant High-energy X-Ray Source Population $\textit{text}$
| Autor: | Lansbury, GB, Stern, D, Aird, J, Alexander, DM, Fuentes, C, Harrison, FA, Treister, E, Bauer, FE, Tomsick, JA, Baloković, M, Moro, AD, Gandhi, P, Ajello, M, Annuar, A, Ballantyne, DR, Boggs, SE, Brandt, WN, Brightman, M, Chen, CTJ, Christensen, FE, Civano, F, Comastri, A, Craig, WW, Forster, K, Grefenstette, BW, Hailey, CJ, Hickox, RC, Jiang, B, Jun, HD, Koss, M, Marchesi, S, Melo, AD, Mullaney, Noirot, G, Schulze, S, Walton, DJ, Zappacosta, L, Zhang, WW |
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| Přispěvatelé: | Lansbury, George [0000-0002-5328-9827], Aird, James [0000-0003-1908-8463], Walton, Dominic [0000-0001-5819-3552], Apollo - University of Cambridge Repository |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
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| Popis: | We present the first full catalog and science results for the $\textit{Nuclear Spectroscopic Telescope Array}$ ($\textit{Nu}$STAR) serendipitous survey. The catalog incorporates data taken during the first 40 months of $\textit{Nu}$STAR operation, which provide ≈20 Ms of effective exposure time over 331 fields, with an areal coverage of 13 deg$^{2}$, and 497 sources detected in total over the 3-24 keV energy range. There are 276 sources with spectroscopic redshifts and classifications, largely resulting from our extensive campaign of ground-based spectroscopic follow-up. We characterize the overall sample in terms of the X-ray, optical, and infrared source properties. The sample is primarily composed of active galactic nuclei (AGNs), detected over a large range in redshift from $z$ = 0.002 to 3.4 (median of $\langle z\rangle =0.56$) = 0.56), but also includes 16 spectroscopically confirmed Galactic sources. There is a large range in X-ray flux, from log(f$_{3-24keV}$/erg s$^{-1}$ cm$^{-2}$) ≈ -14 to -11, and in rest-frame 10-40 keV luminosity, from (L$_{10-40keV}$/erg s$^{-1}$) ≈ 39 to 46, with a median of 44.1. Approximately 79% of the $\textit{Nu}$STAR sources have lower-energy ( 10$^{44}$ erg s$^{-1}$) to ≈80% at the lowest luminosities (LX < 10$^{43}$ erg s$^{-1}$). Our optical spectroscopic analysis finds that the observed fraction of optically obscured AGNs (i.e., the type 2 fraction) is F$_{Type 2}$ = 53$^{+15}_{−14}$%, for a well-defined subset of the 8-24 keV selected sample. This is higher, albeit at a low significance level, than the type 2 fraction measured for redshift- and luminosity-matched AGNs selected by Please visit the publisher's website. |
| Databáze: | OpenAIRE |
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