Premium
Constraining the shielded wind scenario in PG 2112+059
Author(s) -
Saez C.,
Brandt W. N.,
Bauer F. E.,
Hamann F.,
Chartas G.,
Gallagher S. C.
Publication year - 2016
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.201612344
Subject(s) - physics , quasar , astrophysics , astronomy , absorption (acoustics) , ionization , emission spectrum , galaxy , spectral line , optics , ion , quantum mechanics
The physical scenario describing the origin of quasar winds remains largely unsettled due to our failure to account for X‐ray weak BAL quasars. We approach this problem by studying the relation between the inner part of the outflow which is likely to be shielding the X‐ray emission and the UV winds characterized by broad absorption lines (BALs). In particular, we aim to probe the wind‐shield connection in the highly X‐ray variable BAL quasar PG 2112+059, which has exhibited periods of X‐ray weakness and X‐ray normality in the past. A set of two 20 ks Chandra observations and two contemporaneous HST observations, separated by at least eight months, combined with a nearly simultaneous archival Chandra ‐HST observation from 2002, afford us a unique opportunity to study the connection between the shield (which is thought to be responsible for the X‐ray absorption) and the ionization state of the wind (observed as UV BAL features; e.g., Civ and Ovi lines) over various timescales. In this review, which was based on a presentation in the XMM‐Newton 2015 Science Workshop, we provide background relevant to our study and briefly analyze a recent Chandra observation of our new set of multiwavelength observations of PG 2112+059. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)