Galactic Winds across the Gas-Rich Merger Sequence II. Lyman Alpha Emission and Highly Ionized O VI and N V Outflows in Ultraluminous Infrared Galaxies

Abstract

This paper is the second in a series aimed at examining the gaseous environments of z$\le$0.3 quasars and ultraluminous infrared galaxies (ULIRGs) as a function of AGN/host galaxy properties across the merger sequence. This second paper focuses on the Ly$\alpha$ emission and O VI and N V absorption features, tracers of highly ionized gas outflows, in ULIRGs observed with HST/COS. Ly$\alpha$ emission is detected in 15 out of 19 ULIRGs, and 12 of the 14 clear Ly$\alpha$ detections show emission with blueshifted velocity centroids and/or wings. The equivalent widths of the Ly$\alpha$ emission increase with increasing AGN luminosities and AGN bolometric fractions. The blueshifts of the Ly$\alpha$ emission correlate positively with those of the [O III] emission, where the latter traces the ionized gas outflows. The Ly$\alpha$ escape fractions tend to be slightly larger in objects with stronger AGN and larger outflow velocities, but they do not correlate with nebular line reddening. Among the 12 ULIRGs with good continuum signal-to-noise ratios, O VI and/or N V absorption features are robustly detected in 6 of them, all of which are blueshifted, indicative of outflows. In the combined ULIRG $+$ quasar sample, the outflows are more frequently detected in the X-ray weak or absorbed sources. The absorption equivalent widths, velocities and velocity dispersions of the outflows are also higher in the X-ray weak sources. No other strong correlations are visible between the properties of the outflows and those of the AGN or host galaxies.

Accepted for publication in ApJ. 32 pages, 16 figures, and 9 tables. Comments are more than welcome!

References in corpus (30)

• Array Programming with NumPy
• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• Some Aspects of Measurement Error in Linear Regression of Astronomical Data
• Massive molecular outflows and negative feedback in ULIRGs observed by Herschel-PACS
• BAT AGN Spectroscopic Survey - V. X-ray properties of the Swift/BAT 70-month AGN catalog
• A Close Look at Star Formation around Active Galactic Nuclei
• A Catalog of Broad Absorption Line Quasars in Sloan Digital Sky Survey Data Release 5
• Wind from the black-hole accretion disk driving a molecular outflow in an active galaxy
• The Discovery of 1000 km/s Outflows in Massive Post-starburst Galaxies at z=0.6
• Spitzer Quasar and ULIRG Evolution Study (QUEST): II. The Spectral Energy Distributions of Palomar-Green Quasars
• A High-Resolution Survey of Low-Redshift QSO Absorption Lines: Statistics and Physical Conditions of O VI Absorbers
• The COS-Halos Survey: Origins of the Highly Ionized Circumgalactic Medium of Star-Forming Galaxies
• The Intrinsic Fraction of Broad Absorption Line Quasars
• X-ray Insights into the Nature of PHL 1811 Analogs and Weak Emission-Line Quasars: Unification with a Geometrically Thick Accretion Disk?
• Quasar-Mode Feedback in Nearby Type 1 Quasars: Ubiquitous Kiloparsec-Scale Outflows and Correlations with Black Hole Properties
• Molecular outflows in local galaxies: Method comparison and a role of intermittent AGN driving
• Mapping Large-Scale Gaseous Outflows in Ultraluminous Infrared Galaxies with Keck II ESI Spectra: Spatial Extent of the Outflow
• An optical spectroscopic survey of the 3CR sample of radio galaxies with z<0.3. I. Presentation of the data
• Quasar Feedback in the Ultraluminous Infrared Galaxy F11119+3257: Connecting the Accretion Disk Wind with the Large-Scale Molecular Outflow
• Weak Hard X-ray Emission from Broad Absorption Line Quasars: Evidence for Intrinsic X-ray Weakness
• The LyAlpha Line Profiles of Ultraluminous Infrared Galaxies: Fast Winds and Lyman Continuum Leakage
• A Hard X-ray Test of HCN Enhancements as a Tracer of Embedded Black Hole Growth
• The COS Absorption Survey of Baryon Harbors: Unveiling the Physical Conditions of Circumgalactic Gas through Multiphase Bayesian Ionization Modeling
• Evolution of Lyman Alpha Galaxies: Stellar Populations at z ~ 0.3
• Half-Megasecond Chandra Spectral Imaging of the Hot Circumgalactic Nebula around Quasar Mrk 231
• Elliptical Galaxy in the Making: The Dual Active Galactic Nuclei and Metal-enriched Halo of Mrk 273
• On the Emergence of Thousands of Absorption Lines in the Quasar PG1411+442: A Clumpy High-Column Density Outflow from the Broad Emission-Line Region?
• Galactic Winds across the Gas-Rich Merger Sequence: I. Highly Ionized N V and O VI Outflows in the QUEST Quasars
• Feeding and feedback in the powerful radio galaxy 3C 120
• Evidence for Late-Time Feedback from the Discovery of Multiphase Gas in a Massive Elliptical at $z=0.4$

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