Blair D. Savage
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A Classification Scheme for Quasar Absorption Lines Open
We present a method to classify intergalactic absorption lines and apply it to 10,772 low-redshift systems. The classification gives the number of components (reflecting the kinematics) in four different ionization phases, using detections…
View article: A Search for 3-mm Molecular Absorption Line Transitions in the Magellanic Stream
A Search for 3-mm Molecular Absorption Line Transitions in the Magellanic Stream Open
The Magellanic Stream, a tidal tail of diffuse gas falling onto the Milky Way, formed by interactions between the Small and Large Magellanic Clouds, is primarily composed of neutral atomic hydrogen (HI). The deficiency of dust and the diff…
View article: A search for 3-mm molecular absorption line transitions in the magellanic stream
A search for 3-mm molecular absorption line transitions in the magellanic stream Open
The Magellanic Stream (MS), a tail of diffuse gas formed from tidal and ram pressure interactions between the Small and Large Magellanic Clouds (SMC and LMC) and the Halo of the Milky Way, is primarily composed of neutral atomic hydrogen (…
View article: The Distribution of Metallicities in the Local Galactic Interstellar Medium*
The Distribution of Metallicities in the Local Galactic Interstellar Medium* Open
In this investigation, we present an analysis of the metallicity distribution that pertains to neutral gas in the local Galactic interstellar medium (ISM). We derive relative ISM metallicities for a sample of 84 sight lines probing diffuse…
View article: The Distribution of Metallicities in the Local Galactic Interstellar Medium
The Distribution of Metallicities in the Local Galactic Interstellar Medium Open
In this investigation, we present an analysis of the metallicity distribution that pertains to neutral gas in the local Galactic interstellar medium (ISM). We derive relative ISM metallicities for a sample of 84 sight lines probing diffuse…
View article: Molecular Gas within the Milky Way's Nuclear Wind
Molecular Gas within the Milky Way's Nuclear Wind Open
We report the first direct detection of molecular hydrogen associated with the Galactic nuclear wind. The Far-Ultraviolet Spectroscopic Explorer spectrum of LS 4825, a B1 Ib-II star at $l,b$ = 1.67$^{\circ}$,$-$6.63$^{\circ}$ lying $d$ = 9…
The H i Column Density Distribution of the Galactic Disk and Halo Open
We present a census of neutral gas in the Milky Way disk and halo down to limiting column densities of N (H i ) ∼ 10 14 cm −2 using measurements of H i Lyman series absorption from the Far Ultraviolet Spectroscopic Explorer. Our results ar…
The COS-legacy survey of C <span>iv</span> absorbers: properties and origins of the intervening systems Open
We present here results from a survey of intervening C iv absorbers at z 0.01L⋆), the Sloan Digital Sky Survey provides a tentative evidence of declining covering fraction for strong C iv (N > 1013.5 cm−2) with ρ (impact parameter) and ρ/R…
The evolution of the low-density H <span>i</span> intergalactic medium from <i>z</i> = 3.6 to 0: data, transmitted flux, and H <span>i</span> column density,, Open
We present a new, uniform analysis of the H i transmitted flux (F) and H i column density ($N_{\mathrm{H\,{\small I}}}$) distribution in the low-density IGM as a function of redshift z for 0 < z < 3.6 using 55 HST/COS FUV (Δz = 7.2 at z < …
Physical conditions of five O <span>vi</span> absorption systems towards PG 1522+101 Open
We present the analysis of five O vi absorbers identified across a redshift path of z ∼ (0.6−1.3) towards the background quasar PG 1522+101 with information on five consecutive ionization stages of oxygen from O ii to O vi. The combined HS…
View article: A Galaxy Redshift Survey Near HST/COS AGN Sight Lines
A Galaxy Redshift Survey Near HST/COS AGN Sight Lines Open
To establish the connection between galaxies and UV-detected absorption systems in the local universe, a deep ( g ≤ 20) and wide (∼20′ radius) galaxy redshift survey is presented around 47 sight lines to UV-bright AGNs observed by the Cosm…
View article: Probing the Southern Fermi Bubble in Ultraviolet Absorption Using Distant AGNs
Probing the Southern Fermi Bubble in Ultraviolet Absorption Using Distant AGNs Open
The Fermi Bubbles are two giant gamma-ray emitting lobes extending 55° above and below the Galactic center. While the Northern Bubble has been extensively studied in ultraviolet (UV) absorption, little is known about the gas kinematics of …
Detection of low-metallicity warm plasma in a galaxy overdensity environment at z ∼ 0.2 Open
We present results from the analysis of a multiphase O VI - broad Ly-alpha absorber at z = 0.19236 in the HST/COS spectrum of PG 1121+422. The low and intermediate ionization metal lines in this absorber have a single narrow component, whe…
Probing the Outflowing Multiphase Gas ∼1 kpc below the Galactic Center Open
Comparison of interstellar medium (ISM) absorption in the UV spectrum of LS 4825, a B1 Ib−II star d = 21 ± 5 kpc from the Sun toward l = 1.°67 and b = −6.°63, with ISM absorption toward an aligned foreground star at d 7 kpc, ∼1 kpc below t…
Probing the Outflowing Multiphase Gas ~1 kpc Below the Galactic Center Open
Comparison of ISM absorption in the UV spectrum of LS 4825, a B1 Ib-II star d=21+/-5 kpc from the Sun toward l = 1.67 deg and b = -6.63 deg, with ISM absorption toward an aligned foreground star at d 7 kpc, ~1 kpc below the galactic plane,…
Detection of two intervening Ne viii absorbers probing warm gas at z ∼ 0.6 Open
We report on the detection of two Ne VIII absorbers, at z = 0.61907 and z =\n0.57052 in the HST/COS spectrum of background quasars SDSS J 080908.13+461925.6\nand SBS 1122+594 respectively. The Ne VIII 770 line is at $\\sim 3\\sigma$\nsigni…
MAPPING THE NUCLEAR OUTFLOW OF THE MILKY WAY: STUDYING THE KINEMATICS AND SPATIAL EXTENT OF THE NORTHERN FERMI BUBBLE Open
We report new observations from a systematic, spectroscopic, ultraviolet absorption-line survey that maps the spatial and kinematic properties of the high-velocity gas in the Galactic Center region. We examine the hypothesis that this gas …
View article: Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-line Spectroscopy. II. Methods and Models<sup>∗</sup>
Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-line Spectroscopy. II. Methods and Models<sup>∗</sup> Open
We present basic data and modeling for a survey of the cool, photoionized circumgalactic medium (CGM) of low-redshift galaxies using far-UV QSO absorption-line probes. This survey consists of “targeted” and “serendipitous” CGM subsamples, …
A pair of O vi and broad Ly α absorbers probing warm gas in a galaxy group environment at<i>z</i>∼ 0.4 Open
We report the detection of two O vi absorbers at z = 0.416 14 and 0.419 50 (|Δv| = 710 km s−1), towards SBS 0957+599. Both absorbers are multiphase systems tracing substantial reservoirs of warm baryons. The low- and intermediate-ionizatio…