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  Chandra X-Rays from the Redshift 7.54 Quasar ULAS J1342+0928

Bañados, E., Connor, T., Stern, D., Mulchaey, J., Fan, X., Decarli, R., et al. (2018). Chandra X-Rays from the Redshift 7.54 Quasar ULAS J1342+0928. The Astrophysical Journal, 856.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CF18-8 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CF19-7
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018ApJ...856L..25B (Any fulltext)
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 Creators:
Bañados, Eduardo1, Author
Connor, Thomas1, Author
Stern, Daniel1, Author
Mulchaey, John1, Author
Fan, Xiaohui1, Author
Decarli, Roberto1, Author
Farina, Emanuele P.1, Author
Mazzucchelli, Chiara1, Author
Venemans, Bram P.1, Author
Walter, Fabian1, Author
Wang, Feige1, Author
Yang, Jinyi1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: cosmology: observations early universe quasars: individual: ULAS J134208.10+092838.61 Astrophysics - Astrophysics of Galaxies
 Abstract: We present a 45 ks Chandra observation of the quasar ULAS J1342+0928 at z = 7.54. We detect {14.0}-3.7+4.8 counts from the quasar in the observed-frame energy range 0.5-7.0 keV (6σ detection), representing the most distant non-transient astronomical source identified in X-rays to date. The present data are sufficient only to infer rough constraints on the spectral parameters. We find an X-ray hardness ratio of { \mathcal H }{ \mathcal R }=-{0.51}-0.28+0.26 between the 0.5-2.0 keV and 2.0-7.0 keV ranges and derive a power-law photon index of {{Γ }}={1.95}-0.53+0.55. Assuming a typical value for high-redshift quasars of Γ = 1.9, ULAS J1342+0928 has a 2-10 keV rest- frame X-ray luminosity of {L}2-10={11.6}-3.5+4.3× {10}44 {erg} {{{s}}}-1. Its X-ray-to-optical power-law slope is {α }OX}=-{1.67}-0.10+0.16, consistent with the general trend indicating that the X-ray emission in the most bolometrically powerful quasars is weaker relative to their optical emission.

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 Dates: 2018
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 856 Sequence Number: - Start / End Page: - Identifier: -