The X-rays wind connection in PG 2112+059. Issue 1 (17th June 2021)

• Record Type: Journal Article
• Authors: Saez, C; Brandt, W N; Bauer, F E; Chartas, G; Misawa, T; Hamann, F; Gallagher, S C
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 506:Issue 1(2021)
• Page Start: 343
• Page End: 356
• Publication Date: 2021-06-17
• Subjects: techniques: spectroscopic -- galaxies: active -- galaxies: individual: PG 2112+059 -- quasars: absorption lines -- X-rays: galaxies; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stab1706
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We study the connection between the X-ray and ultraviolet (UV) properties of the broad absorption line (BAL) wind in the highly X-ray variable quasar PG 2112+059 by comparing Chandra -ACIS data with contemporaneous UV HST /STIS spectra in three different epochs. We observe a correlation whereby an increase in the equivalent widths (EWs) of the BALs is accompanied by a redder UV spectrum. The growth in the BAL EWs is also accompanied by a significant dimming in soft X-ray emission (${\lesssim}2 \, \text{keV}$ ), consistent with increased absorption. Variations in the hard X-ray emission (${\gtrsim}2\, \text{keV}$ ) are only accompanied by minor spectral variations of the UV-BALs and do not show significant changes in the EW of BALs. These trends suggest a wind-shield scenario where the outflow inclination with respect to the line of sight is decreasing and/or the wind mass is increasing. These changes elevate the covering fraction and/or column densities of the BALs and are likely accompanied by a nearly contemporaneous increase in the column density of the shield.