In this work we report deep MUSE observations of a broad absorption line (BAL) quasar at z ~ 5, revealing a Lyα nebula with a maximum projected linear size of ~60 kpc around the quasar (down to our 2σ SB limit per layer of ~ 9 × 10-19 erg s-1 cm-2 arcsec-2 for a 1 arcsec2 aperture). After correcting for the cosmological surface brightness dimming, we find that our nebula, at z~5, has an intrinsically less extended Lyα 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 Lyα 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 (~10 kpc) of the circumgalactic medium of our source, the velocity dispersion of the Lyα emission is very high (FWHM > 1000 km s-1), suggesting that in our case we may be probing outflowing material associated with the quasar.

Extended and broad Lyα emission around a BAL quasar at z ~ 5 / Ginolfi M.; Maiolino R.; Carniani S.; Arrigoni Battaia F.; Cantalupo S.; Schneider R.. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - ELETTRONICO. - 476:(2018), pp. 0-0. [10.1093/MNRAS/STY364]

Extended and broad Lyα emission around a BAL quasar at z ~ 5

Ginolfi M.
;
2018

Abstract

In this work we report deep MUSE observations of a broad absorption line (BAL) quasar at z ~ 5, revealing a Lyα nebula with a maximum projected linear size of ~60 kpc around the quasar (down to our 2σ SB limit per layer of ~ 9 × 10-19 erg s-1 cm-2 arcsec-2 for a 1 arcsec2 aperture). After correcting for the cosmological surface brightness dimming, we find that our nebula, at z~5, has an intrinsically less extended Lyα 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 Lyα 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 (~10 kpc) of the circumgalactic medium of our source, the velocity dispersion of the Lyα emission is very high (FWHM > 1000 km s-1), suggesting that in our case we may be probing outflowing material associated with the quasar.
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Ginolfi M.; Maiolino R.; Carniani S.; Arrigoni Battaia F.; Cantalupo S.; Schneider R.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/1289274
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