Extended and broad Ly α emission around a BAL quasar at z ∼ 5

被引：27

作者：

Ginolfi, M. ^{[1
,2
]}

Maiolino, R. ^{[3
,4
]}

Carniani, S. ^{[3
,4
]}

Battaia, F. Arrigoni ^{[5
]}

Cantalupo, S. ^{[6
]}

Schneider, R. ^{[1
,2
]}

机构：

[1] Osserv Astron Roma, INAF, Via Frascati 33, I-00040 Monte Porzio Catone, Italy

[2] Sapienza Univ Roma, Dipartimento Fis, Piazzale Aldo Moro 5, I-00185 Rome, Italy

[3] Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England

[4] Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England

[5] European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[6] Swiss Fed Inst Technol, Dept Phys, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 476卷 / 02期

基金：

瑞士国家科学基金会; 英国科学技术设施理事会; 欧洲研究理事会;

关键词：

galaxies: haloes; intergalactic medium; quasars: emission lines; quasars: general; cosmology: observations; METAL-POOR GAS; CIRCUMGALACTIC MEDIUM; ABSORPTION-LINE; COSMIC WEB; SPECTROSCOPY; GALAXY; CONTINUUM; BLOBS; HALO; ABSORBERS;

D O I：

10.1093/mnras/sty364

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this work we report deep MUSE observations of a broad absorption line (BAL) quasar at z similar to 5, revealing a Ly alpha nebula with a maximum projected linear size of similar to 60 kpc around the quasar (down to our 2 sigma SB limit per layer of similar to 9 x 10(-19) erg s(-1) cm(-2) arcsec(-2) for a 1 arcsec(2) aperture). After correcting for the cosmological surface brightness dimming, we find that our nebula, at z similar to 5, has an intrinsically less extended Ly alpha emission than nebulae at lower redshift. However, such a discrepancy is greatly reduced when referring to comoving distances, which take into account the cosmological growth of dark matter (DM) haloes, suggesting a positive correlation between the size of Ly alpha nebulae and the sizes of DM haloes/structures around quasars. Differently from the typical nebulae around radio-quiet non-BAL quasars, in the inner regions (similar to 10 kpc) of the circumgalactic medium of our source, the velocity dispersion of the Ly alpha emission is very high (FWHM > 1000 km s(-1)), suggesting that in our case we may be probing outflowing material associated with the quasar.

引用

页码：2421 / 2431

页数：11

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