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Paper   IPM / Astronomy / 16829
School of Astronomy
  Title:   MusE GAs Flow and Wind (MEGAFLOW) VI. A study of CIV and MgII absorbing gas surrounding [OII] emitting galaxies
  Author(s): 
1.  Ilane . Schroetter
2.  Nicolas . F. Bouché
3.  Johannes. Zabl
4.  Hadi . Rahmani
5.  Martin . Wendt
6.  Sowgat . Muzahid
7.  Thierry . Contini
8.  Joop . Schaye
9.  Kasper . B. Schmidt
10.  Lutz . Wisotzki
  Status:   Published
  Journal: MNRAS
  Vol.:  506
  Year:  2021
  Supported by:            ipm IPM
  Abstract:
Using the MEGAFLOW survey, which consists of a combination of MUSE and UVES observations of 22 quasar fields selected to contain strong Mg II absorbers, we measure the covering fractions of C IV and Mg II as a function of impact parameter b using a novel Bayesian logistic regression method on unbinned data, appropriate for small samples. We also analyse how the C IV and Mg II covering fractions evolve with redshift. In the MUSE data, we found 215 z=1−1.5 [O II] emitters with fluxes >10−17 erg s−1 cm−2 and within 250 kpc of quasar sight-lines. Over this redshift path z=1−1.5⁠, we have 19 (32) C IV (Mg II) absorption systems with rest-frame equivalent width (REW) Wr> 0.05 Å associated with at least one [O II] emitter. The covering fractions of z≈1.2 C IV (Mg II) absorbers with mean Wr≈ 0.7 Å (1.0 Å), exceeds 50 per cent within 23+62−16 (46+18−13⁠) kpc. Together with published studies, our results suggest that the covering fraction of C IV (Mg II) becomes larger (smaller) with time, respectively. For absorption systems that have C IV but not Mg II, we find in 73 per cent of the cases no [O II] counterpart. This may indicate that C IV comes from the intergalactic medium (IGM), i.e. beyond 250 kpc, or that it is associated with lower mass or quiescent galaxies

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