Skip navigation
  • INAF logo
  • Home
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects
  • Explore by
    • Research outputs
    • Researchers
    • Organization units
    • Projects
  • Login:
    • My DSpace
    • Receive email
      updates
    • Edit Account details
  • Italian
  • English

  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/20.500.12386/29182
Title: Solving the conundrum of intervening strong Mg II absorbers towards gamma-ray bursts and quasars
Authors: Christensen, L.
Vergani, S. D.
Schulze, S.
Annau, N.
Selsing, J.
Fynbo, J. P. U.
de Ugarte Postigo, A.
Cañameras, R.
Lopez, S.
Passi, D.
Cortés-Zuleta, P.
Ellison, S. L.
D'ODORICO, Valentina 
Becker, G.
Berg, T. A. M.
Cano, Z.
COVINO, Stefano 
CUPANI, Guido 
D'Elia, V.
Goldoni, P.
Gomboc, A.
Hammer, F.
Heintz, K. E.
Jakobsson, P.
Japelj, J.
Kaper, L.
Malesani, D.
Møller, P.
Petitjean, P.
Pugliese, V.
Sánchez-Ramírez, R.
Tanvir, N. R.
Thöne, C. C.
Vestergaard, M.
Wiersema, K.
Worseck, G.
Issue Date: 2017
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 608
First Page: A84
Abstract: Previous studies have shown that the incidence rate of intervening strong Mg II absorbers towards gamma-ray bursts (GRBs) were a factor of 2-4 higher than towards quasars. Exploring the similar sized and uniformly selected legacy data sets XQ-100 and XSGRB, each consisting of 100 quasar and 81 GRB afterglow spectra obtained with a single instrument (VLT/X-shooter), we demonstrate that there is no disagreement in the number density of strong Mg II absorbers with rest-frame equivalent widths W_r<SUP>λ2796>1</SUP> Å towardsGRBs and quasars in the redshift range 0.1 ≲ z ≲ 5. With large and similar sample sizes, and path length coverages of ∆z = 57.8 and 254.4 for GRBs and quasars, respectively, the incidences of intervening absorbers are consistent within 1σ uncertainty levels at all redshifts. For absorbers at z < 2.3, the incidence towards GRBs is a factor of 1.5 ± 0.4 higher than the expected number of strong Mg II absorbers in Sloan Digital Sky Survey (SDSS) quasar spectra, while for quasar absorbers observed with X-shooter we find an excess factor of 1.4 ± 0.2 relative to SDSS quasars. Conversely, the incidence rates agree at all redshifts with reported high-spectral-resolution quasar data, and no excess is found. The only remaining discrepancy in incidences is between SDSS Mg II catalogues and high-spectral-resolution studies. The rest-frame equivalent-width distribution also agrees to within 1σ uncertainty levels between the GRB and quasar samples. Intervening strong Mg II absorbers towards GRBs are therefore neither unusually frequent, nor unusually strong. <P />Based on observations collected at the European Southern Observatory, Paranal, Chile, Program ID: 098.A-0055, 097.A-0036, 096.A-0079, 095.B-0811(B), 095.A-0045, 094.A-0134, 093.A-0069, 092.A-0124, 0091.C-0934, 090.A-0088, 089.A-0067, 088.A-0051, 087.A-0055, 086.A-0073, 085.A-0009 and 084.A-0260. XQ-100: 189.A-0424.
URI: http://hdl.handle.net/20.500.12386/29182
URL: https://www.aanda.org/articles/aa/abs/2017/12/aa31382-17/aa31382-17.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201731382
Bibcode ADS: 2017A&A...608A..84C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

Files in This Item:
File Description SizeFormat 
aa31382-17.pdfpdf editoriale391.52 kBAdobe PDFView/Open
Show full item record

Page view(s)

3
checked on Jan 16, 2021

Download(s)

2
checked on Jan 16, 2021

Google ScholarTM

Check

Altmetric


Items in DSpace are published in Open Access, unless otherwise indicated.


Explore by
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects

Informazioni e guide per autori

https://openaccess-info.inaf.it: tutte le informazioni sull'accesso aperto in INAF

Come si inserisce un prodotto: le guide a OA@INAF

La Policy INAF sull'accesso aperto

Documenti e modelli scaricabili

Feedback
Built with DSpace-CRIS - Extension maintained and optimized by Logo 4SCIENCE