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  Large-scale Environment of a z = 6.61 Luminous Quasar Probed by Lyα Emitters and Lyman Break Galaxies

Ota, K., Venemans, B. P., Taniguchi, Y., Kashikawa, N., Nakata, F., Harikane, Y., et al. (2018). Large-scale Environment of a z = 6.61 Luminous Quasar Probed by Lyα Emitters and Lyman Break Galaxies. The Astrophysical Journal, 856.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CBE0-9 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CBE1-8
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018ApJ...856..109O (Any fulltext)
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 Creators:
Ota, Kazuaki1, Author
Venemans, Bram P.1, Author
Taniguchi, Yoshiaki1, Author
Kashikawa, Nobunari1, Author
Nakata, Fumiaki1, Author
Harikane, Yuichi1, Author
Bañados, Eduardo1, Author
Overzier, Roderik1, Author
Riechers, Dominik A.1, Author
Walter, Fabian1, Author
Toshikawa, Jun1, Author
Shibuya, Takatoshi1, Author
Jiang, Linhua1, 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 galaxies: evolution galaxies: formation quasars: individual: VIKING J030516.92─315056.0 Astrophysics - Astrophysics of Galaxies
 Abstract: Quasars (QSOs) hosting supermassive black holes are believed to reside in massive halos harboring galaxy overdensities. However, many observations revealed average or low galaxy densities around z ≳ 6 QSOs. This could be partly because they measured galaxy densities in only tens of arcmin2 around QSOs and might have overlooked potential larger-scale galaxy overdensities. Some previous studies also observed only Lyman break galaxies (LBGs; massive older galaxies) and missed low- mass young galaxies, like Lyα emitters (LAEs), around QSOs. Here we present observations of LAE and LBG candidates in ̃700 arcmin2 around a z = 6.61 luminous QSO using the Subaru Telescope Suprime-Cam with narrowband/broadband. We compare their sky distributions, number densities, and angular correlation functions with those of LAEs/LBGs detected in the same manner and comparable data quality in our control blank field. In the QSO field, LAEs and LBGs are clustering in 4-20 comoving Mpc angular scales, but LAEs show mostly underdensity over the field while LBGs are forming 30 × 60 comoving Mpc2 large-scale structure containing 3σ-7σ high-density clumps. The highest-density clump includes a bright (23.78 mag in the narrowband) extended (≳16 kpc) Lyα blob candidate, indicative of a dense environment. The QSO could be part of the structure but is not located exactly at any of the high-density peaks. Near the QSO, LAEs show underdensity while LBGs average to 4σ excess densities compared to the control field. If these environments reflect halo mass, the QSO may not be in the most massive halo but still in a moderately massive one. Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.

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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: -