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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29185
Title: Hunting for metals using XQ-100 Legacy Survey composite spectra
Authors: Perrotta, S.
D'ODORICO, Valentina 
Hamann, F.
CRISTIANI, Stefano 
Prochaska, J. X.
Ellison, S. L.
Lopez, S.
CUPANI, Guido 
Becker, G.
Berg, T. A. M.
Christensen, L.
Denney, K. D.
Worseck, G.
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 481
Issue: 1
First Page: 105
Abstract: We investigate the N V absorption signal along the line of sight of background quasars, in order to test the robustness of the use of this ion as the criterion to select intrinsic (i.e. physically related to the quasar host galaxy) narrow absorption lines (NALs). We build composite spectra from a sample of ∼ 1000 C IV absorbers, covering the redshift range 2.55 < z < 4.73, identified in 100 individual sight lines from the XQ-100 Legacy Survey. We detect a statistically significant N V absorption signal only within 5000 km s<SUP>-1</SUP> of the systemic redshift, z_em. This absorption trough is ∼ 15σ when only C IV systems with N(C IV) > 10<SUP>14</SUP> cm<SUP>-2</SUP> are included in the composite spectrum. This result confirms that N V offers an excellent statistical tool to identify intrinsic systems. We exploit stacks of 11 different ions to show that the gas in proximity to a quasar exhibits a considerably different ionization state with respect to gas in the transverse direction and intervening gas at large velocity separations from the continuum source. Indeed, we find a dearth of cool gas, as traced by low-ionization species and in particular by Mg II, in the proximity of the quasar. We compare our findings with the predictions given by a range of CLOUDY ionization models and find that they can be naturally explained by ionization effects of the quasar.
URI: http://hdl.handle.net/20.500.12386/29185
URL: https://academic.oup.com/mnras/article/481/1/105/5090323
ISSN: 0035-8711
DOI: 10.1093/mnras/sty2205
Bibcode ADS: 2018MNRAS.481..105P
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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