On the structure and energetics of quasar broad absorption-line outflows

TL;DR

This study uses composite spectra of quasar broad absorption lines to analyze their structure, ionization, and energetics, revealing insights into outflow properties and their potential role in galaxy evolution.

Contribution

It provides new insights into the structure, ionization, and energetics of quasar outflows using composite spectra, overcoming previous observational challenges.

Findings

Presence of PV absorption indicating high column densities and saturation.

Inhomogeneous partial covering on small spatial scales.

Outflows have sufficient kinetic energy for galaxy feedback.

Abstract

Quasar accretion-disk outflows might play an important role in galaxy evolution, but they are notoriously difficult to study due to line saturation and blending problems in the Ly-alpha forest. We circumvent these problems by constructing median composite spectra of diverse broad absorption lines (BALs) and `mini-BALs' in SDSS-III BOSS quasars at redshifts 2.3 < z < 3.5. Sorting by CIV 1549,1551 absorption-line strength with AlIII 1855,1863 as an additional indicator of low ionisations (LoBALs) we find the following: (1) Deeper and broader BALs are accompanied by weaker HeII 1640 emission lines, consistent with softer ionising spectra producing more effective radiative acceleration. (2) PV 1118,1128 absorption is present with resolved ~1:1 depth ratios in all composites from mini-BALs to strong BALs indicating that line saturation, large total column densities log N_H(cm^-2) > 22.7, and large ionisation parameters log U > -0.5 are common. (3) Different observed depths in saturated lines identify inhomogeneous partial covering on spatial scales <0.006 pc, where weak/low-abundance transitions like PV form in small high-column density clumps while stronger/broader lines like CIV form in larger volumes. (4) Excited-state SiIV* 1073 and CIII* 1176 lines in BAL outflows indicate typical densities n_e > 3 x 10^5 cm^-3 and maximum radial distances R < 23pc from the quasars. (5) For reasonable actual distances, the median BAL outflow has minimum kinetic energy L_K/L > 0.005(R/1.2pc) sufficient (by some estimates) for feedback to galaxy evolution. (6) LoBAL quasars have the largest median outflow column densities, highest velocities, and weakest HeII 1640 emission in our study; they appear to be at one extreme in a distribution of quasar properties where softer ionising spectra drive more powerful outflows.