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X-raying the Intergalactic OVI Absorbers
Y. Yao, T. M. Tripp, Q. D. Wang +5
The observed intergalactic OVI absorbers at z>0 have been regarded as a significant reservoir of the ``missing baryons''. However, to fully understand how these absorbers contribut…
Observations of the Gas Reservoir around a Star Forming Galaxy in the Early Universe
Brenda L. Frye, David. V. Bowen, Mairead Hurley +8
We present a high signal-to-noise spectrum of a bright galaxy at z = 4.9 in 14 h of integration on VLT FORS2. This galaxy is extremely bright, i_850 = 23.10 +/- 0.01, and is strong…
A High-Resolution Survey of Low-Redshift QSO Absorption Lines: Statistics and Physical Conditions of O VI Absorbers
Todd M. Tripp, Kenneth R. Sembach, David V. Bowen +5
Using high-resolution UV spectra of 16 low-z QSOs, we study the physical conditions and statistics of O VI absorption in the IGM at z < 0.5. We identify 51 intervening (z_{abs} <<…
Physical Properties, Baryon Content, and Evolution of the LyαForest: New Insights from High Resolution Observations at z < 0.4
N. Lehner, B. D. Savage, P. Richter +3
We present a study of the Lyαforest at z<0.4 from which we conclude that at least 20% of the total baryons in the universe are located in the highly-ionized gas traced by broad Lyα…
The O VI Absorbers Toward PG0953+415: High Metallicity, Cosmic-Web Gas Far From Luminous Galaxies
Todd M. Tripp, Bastien Aracil, David V. Bowen +1
The spectrum of the low-redshift QSO PG0953+415 shows two strong, intervening O VI absorption systems. To study the nature of these absorbers, we have used the Gemini Multiobject S…
The Nearby Damped Lyman-alpha Absorber SBS 1543+593: A Large HI Envelope in a Gas-Rich Galaxy Group
J. L. Rosenberg, D. V. Bowen, T. M. Tripp +1
We present a Very Large Array (VLA) HI 21cm map and optical observations of the region around one of the nearest damped Lyman-alpha absorbers beyond the local group, SBS 1543+593.…
High-Resolution Absorption Spectroscopy of Multi-phase, High-Metallicity Gas Associated with the Luminous Quasar HE 0226-4110
Rajib Ganguly, Kenneth R. Sembach, Todd M. Tripp +2
We present FUSE and HST/STIS observations of the absorption line system near the emission redshift of the radio-quiet, X-ray bright quasar HE0226-4110 (z = 0.495, V=15.2). The spec…
Low Redshift Intergalactic Absorption Lines in the Spectrum of HE0226-4110
N. Lehner, B. D. Savage, B. P. Wakker +2
We present an analysis of the FUSE and STIS E140M spectra of HE0226-4110 (z=0.495). We detect 56 Lyman absorbers and 5 O VI absorbers. The number of intervening O VI systems per un…
High Metallicity, Photoionised Gas in Intergalactic Large-Scale Filaments
Bastien Aracil, Todd M. Tripp, David V. Bowen +3
We present high-resolution UV spectra of absorption-line systems toward the low-z QSO HS0624+6907 (z=0.3700). Coupled with spectroscopic galaxy redshifts, we find that many of thes…
The Deuterium, Oxygen, and Nitrogen Abundance Toward LSE 44
S. D. Friedman, G. Hebrard, T. M. Tripp +2
We present measurements of the column densities of interstellar DI, OI, NI, and H2 made with FUSE, and of HI made with IUE toward the sdO star LSE 44, at a distance of 554+/-66 pc.…
The Connections between QSO Absorption Systems and Galaxies: Low-Redshift Observations
Todd M. Tripp, David V. Bowen
Quasar absorption lines have long been recognized to be a sensitive probe of the abundances, physical conditions, and kinematics of gas in a wide variety of environments including…
Measurements of the f-Values of the Resonance Transitions of Ni II at 1317.217A and 1370.132A
Edward B. Jenkins, Todd M. Tripp
We have retrieved high-resolution UV spectra of 69 hot stars from the HST archive and determined the strengths of the interstellar Ni II absorption features at 1317.217A. We then c…
Tracing baryons in the warm-hot intergalactic medium with broad Ly alpha absorption
Philipp Richter, Blair Savage, Ken Sembach +1
We discuss physical properties and baryonic content of broad Ly alpha absorbers (BLAs) at low redshift. These absorption systems, recently discovered in high-resolution, high-signa…
A Comparison of Absorption and Emission Line Abundances in the Nearby Damped Lyman-alpha Galaxy SBS 1543+593
David V. Bowen, Edward B. Jenkins, Max Pettini +1
We have used the Space Telescope Imaging Spectrograph (STIS) aboard HST to measure a sulfur abundance of [S/H] = -0.41 +/-0.06 in the interstellar medium (ISM) of the nearby damped…
FUSE determination of a low deuterium abundance along an extended sight line in the Galactic disk
G. Hebrard, T. M. Tripp, P. Chayer +5
We present a study of the deuterium abundance along the extended sight line (2.7kpc) toward HD 90087 with FUSE. Both in terms of distance and column densities, HD 90087 has the lon…
Multi-phase High-Velocity Clouds toward HE 0226-4110 and PG 0953+414
Andrew J. Fox, Bart P. Wakker, Blair D. Savage +3
We study the physical conditions, elemental abundances, and kinematics of the high-velocity clouds (HVCs) along the sight lines toward active galaxies HE0226-4110 and PG0953+414 us…
Detection of Ne VIII in the Low-Redshift Warm-Hot IGM
Blair D. Savage, Nicolas Lehner, Bart P. Wakker +2
High resolution FUSE and STIS observations of the bright QSO HE 0226-4110 (zem = 0.495) reveal the presence of a multi-phase absorption line system at zabs(O VI) = 0.20701 containi…
A Near-Solar Metallicity, Nitrogen-Deficient Lyman Limit Absorber Associated with two S0 Galaxies
Edward B. Jenkins, David V. Bowen, Todd M. Tripp +1
From UV spectra of the bright quasar PHL 1811 recorded by FUSE and the E140M configuration on STIS, we have determined the abundances of various atomic species in a Lyman limit sys…
Evidence for Correlated Titanium and Deuterium Depletion in the Galactic ISM
Jason X. Prochaska, Todd M. Tripp, J. Christopher Howk
Current measurements indicate that the deuterium abundance in diffuse interstellar gas varies spatially by a factor of ~4 among sightlines extending beyond the Local Bubble. One pl…
Searching for the Missing Baryons in the Warm-hot Intergalactic Medium
P. Richter, B. D. Savage, T. M. Tripp +1
We discuss physical properties and the baryonic content of the Warm-hot Intergalactic Medium (WHIM) at low redshifts. Cosmological simulations predict that the WHIM contains a larg…
The FUSE Survey of OVI Absorption in the Galactic Disk
D. V. Bowen, E. B. Jenkins, T. M. Tripp +2
We outline the results from a FUSE Team program designed to characterize OVI absorption in the disk of the Milky Way. We find that OVI absorption occurs throughout most of the Gala…
Physical Properties and Baryonic Content of Low-Redshift Intergalactic Ly-alpha and O VI Absorption Systems: The PG1116+215 Sight Line
Kenneth R. Sembach, Todd M. Tripp, Blair D. Savage +1
We present HST and FUSE observations of the intergalactic absorption toward PG1116+215 in the 900-3000 A spectral region. We detect 25 Ly-alpha absorbers at rest-frame equivalent w…
FUSE and STIS Observations of the Warm-Hot Intergalactic Medium towards PG1259+593
Philipp Richter, Blair D. Savage, Todd M. Tripp +1
We use FUSE and STIS spectra to study intergalactic absorption towards the quasar PG1259+593 (z=0.478). We identify 135 intergalactic absorption lines with equivalent widths >10mA,…
The Deuterium-to-Hydrogen Ratio in a Low-Metallicity Cloud Falling onto the Milky Way
K. R. Sembach, B. P. Wakker, T. M. Tripp +13
Using Far Ultraviolet Spectroscopic Explorer and Hubble Space Telescope observations of the QSO PG1259+593, we detect D I Lyman-series absorption in high velocity cloud Complex C,…