Back to Search
Start Over
An Associated Absorption System in Front of a Peculiar QSO with z abs ~ z em ~ 2.7
- Source :
- QSO Absorption Lines ISBN: 9783662223734
- Publication Year :
- 1995
- Publisher :
- Springer Berlin Heidelberg, 1995.
-
Abstract
- We report the discovery of Q1044+0546 (M V > −27), whose optical spectrum is dominated by one very strong (W(rest)~110 A) and extraordinarily broad (FWZI(rest)~270A) emission line. We argue that this line is Ly-α at z=2.688, imparting a unique character to this object because the CIV λ1549A emission line which would be around λ5700A, is weak or absent. We present a preliminary interpretation of this QSO discovered as part of our redshift program in the ESO/SERC field no. 927. The rest-frame Ly-α FWHM and FWZI are ≈ 23.000 and ≈ 67.000 km s−1, respectively; these values are among the largest found to date. A heavy element absorption line system is present too, with z=2.654, implying a relative velocity with respect to the QSO of ~ 2700 km s−1. There are also several weaker absorption lines in the blueward region of the Ly-α emission, which are presumably from the Ly-α forest. The emission spectrum of Q1044+0546 may be indicative of very special physical conditions and/or rather high metal abundances in its broad line formation region(BLR). It is of great interest to determine if the physical conditions in the clouds of its associated absorption system are also peculiar, because similarities with the BLR would favour the intrinsic hypothesis for the origin of the z abs ≈ z em systems (see Petitjean et al. 1994).
Details
- ISBN :
- 978-3-662-22373-4
- ISBNs :
- 9783662223734
- Database :
- OpenAIRE
- Journal :
- QSO Absorption Lines ISBN: 9783662223734
- Accession number :
- edsair.doi...........7c95a2fa4fe71a060579ad101b3e3e62
- Full Text :
- https://doi.org/10.1007/978-3-540-49458-4_51