Edward B. Jenkins, David V. Bowen, Kenneth R. Sembach
The UV spectrum of the bright quasar PHL 1811 at zem = 0.192 reveals a foreground gas system at z = 0.080923 with log N(H I) = 17.98 ± 0.05. We have determined the abundances of various atomic...
Tripp, Todd M., Sembach, Kenneth R., Bowen, David V., Savage, Blair D., Jenkins, Edward B., Lehner, Nicolas, ...
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} 30 mA, the number of...
Does the Milky Way Produce a Nuclear Galactic Wind? (2006)
Keeney, Brian A., Danforth, Charles W., Stocke, John T., Penton, Steven V., Shull, J. Michael, Sembach, Kenneth R.
We detect high-velocity absorbing gas using Hubble Space Telescope and Far Ultraviolet Spectroscopic Explorer medium resolution spectroscopy along two high-latitude AGN sight lines (Mrk 1383 and PKS...
Ganguly, Rajib, Sembach, Kenneth R., Tripp, Todd M., Savage, Blair D., Wakker, Bart P.
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 spectra cover the...
Howk, J. Christopher, Sembach, Kenneth R., Savage, Blair D.
We describe a new method for determining total gas-phase abundances for the Galactic ISM with minimal ionization uncertainties. For sight lines toward globular clusters containing both UV-bright...
Multi-phase High-Velocity Clouds toward HE 0226-4110 and PG 0953+414 (2005)
Fox, Andrew J., Wakker, Bart P., Savage, Blair D., Tripp, Todd M., Sembach, Kenneth R., Bland-Hawthorn, Joss
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 using Hubble Space...
Detection of Ne VIII in the Low-Redshift Warm-Hot IGM (2005)
Savage, Blair D., Lehner, Nicolas, Wakker, Bart P., Sembach, Kenneth R., Tripp, Todd M.
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 containing absorption from...
Jenkins, Edward B., Bowen, David V., Tripp, Todd M., Sembach, Kenneth R.
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 system at z = 0.0809...
Cannon, John M., Skillman, Evan D., Sembach, Kenneth R., Bomans, Dominik J.
We present new Far Ultraviolet Spectroscopic Explorer (FUSE) spectroscopy of the dwarf starburst galaxy NGC 625. These observations probe multiple phases of the interstellar medium (ISM), including...
Highly Ionized Gas in the Galactic Halo and the High Velocity Clouds Toward PG 1116+215 (2004)
Ganguly, Rajib, Sembach, Kenneth R., Tripp, Todd M., Savage, Blair D.
We have obtained high resolution FUSE and HST/STIS echelle observations of the quasar PG 1116+215. The semi-continuous coverage of the ultraviolet spectrum over the wavelength range 916-2800 provides...
Exploring Hot Gas in the Galactic Halo and High Velocity Clouds (2004)
Sembach, Kenneth R., Wakker, Bart P., Savage, Blair D., Richter, Philipp
In the five years since its launch, the Far Ultraviolet Spectroscopic Explorer has given the astronomical community a marvelous glimpse into the realm of previously unexplored regions of the Milky...
Missing Baryons in the Warm-Hot Intergalactic Medium (2004)
Tripp, Todd M., Bowen, David V., Sembach, Kenneth R., Jenkins, Edward B., Savage, Blair D., Richter, Philipp
We briefly review the use of UV absorption lines in the spectra of low-redshift QSOs for the study of the physical conditions, metallicity, and baryonic content of the low-z IGM, with emphasis on the...
High-velocity OVI in and near the Milky Way (2004)
Wakker, Bart P., Savage, Blair. D., Sembach, Kenneth R., Richter, Philipp, Fox, Andrew J.
The Far Ultraviolet Spectroscopic Explorer (FUSE) has observed over three hundred fifty sightlines to extragalactic targets. About one hundred fifty of these are of sufficient quality to measure OVI...
Cannon, John M., Skillman, Evan D., Sembach, Kenneth R., Bomans, Dominik J.
We present new FUSE spectroscopy of the dwarf starburst galaxy NGC 625. These observations probe multiple phases of the interstellar medium, including the coronal, ionized, neutral and molecular gas....
Sembach, Kenneth R., Tripp, Todd M., Savage, Blair D., Richter, Philipp
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 widths W_r > 30 mA,...
FUSE and STIS Observations of the Warm-Hot Intergalactic Medium towards PG1259+593 (2004)
Richter, Philipp, Savage, Blair D., Tripp, Todd M., Sembach, Kenneth R.
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, tracing 78...
Hot Gas in the Local Group and Low-Redshift Intergalactic Medium (2003)
There is increasing observational evidence that hot, highly ionized interstellar and intergalactic gas plays a significant role in the evolution of galaxies in the local universe. The primary...
Highly Ionized Gas Surrounding High Velocity Cloud Complex C (2003)
Fox, Andrew J., Savage, Blair D., Wakker, Bart P., Richter, Philipp, Sembach, Kenneth R., Tripp, Todd M.
We present Far Ultraviolet Spectroscopic Explorer and Hubble Space Telescope observations of high, intermediate, and low ion absorption in high-velocity cloud Complex C along the lines of sight...
Ganguly, Rajib, Masiero, Joseph, Charlton, Jane C., Sembach, Kenneth R.
We present HST/STIS and FUSE spectra of the quasar RXJ1230.8+0115 (V=14.4, z=0.117). In addition to Galactic, Virgo, and intervening absorption, this quasar is host to a remarkable intrinsic...
On the Origin of the High-Ionization Intermediate-Velocity Gas Toward HD 14434 (2003)
Knauth, David C., Howk, J. Christopher, Sembach, Kenneth R., Lauroesch, James T., Meyer, David M.
We present Far Ultraviolet Spectroscopic Explorer and Space Telescope Imaging Spectrograph observations of high-ionization interstellar absorption toward HD 14434 [(l, b) = (135.1, -3.8); d ~ 2.3...
Absorption-Line Systems and Galaxies in Front of the Second Brightest Quasar, PHL 1811 (2003)
Jenkins, Edward B., Bowen, David V., Tripp, Todd M., Sembach, Kenneth R., Leighly, Karen M., Halpern, Jules P., ...
The extraordinarily bright quasar PHL 1811 at a redshift z = 0.192 provides an attractive opportunity to use ultraviolet absorption-line spectroscopy to study the properties of gas systems in the...
Hoopes, Charles G., Sembach, Kenneth R., Hebrard, Guillaume, Moos, H. Warren, Knauth, David C.
We have carried out an investigation of the abundance of deuterium along two extended sight lines through the interstellar medium (ISM) of the Galactic disk. The data include Far Ultraviolet...
Ionized Gas in the First 10 kpc of the Interstellar Galactic Halo (2002)
Howk, J. Christopher, Sembach, Kenneth R., Savage, Blair D.
We present FUSE observations of the post-asymptotic giant branch star von Zeipel 1128 (l=42.5, b=+78.7; z=10.0 kpc), located in the globular cluster Messier 3. The FUSE observations cover the...
Origins of the Highly Ionized Gas along the Line of Sight towards HD 116852 (2002)
Fox, Andrew J., Savage, Blair D., Sembach, Kenneth R., Fabian, Dirk, Richter, Philipp, Meyer, David M., ...
We present Hubble Space Telescope Imaging Spectrograph (HST/STIS) and Far Ultraviolet Spectroscopic Explorer (FUSE) observations of high ion interstellar absorption along the sight line to HD 116852....
A Limit on the Metallicity of Compact High Velocity Clouds (2002)
Sembach, Kenneth R., Gibson, Brad K., Fenner, Yeshe, Putman, Mary E.
There is a fortuitous coincidence in the positions of the quasar TonS210 and the compact H I high velocity cloud CHVC224.0-83.4-197 on the sky. Using Far Ultraviolet Spectroscopic Explorer...
FUSE Observations of Degree-Scale Variations in Galactic Halo O VI (2002)
Howk, J. Christopher, Savage, Blair D., Sembach, Kenneth R., Hoopes, Charles G.
We report Far Ultraviolet Spectroscopic Explorer (FUSE) observations of interstellar O VI absorption in the halo of the Milky Way towards 12 early-type stars in the Large Magellanic Cloud (LMC) and...
A FUSE Survey of Interstellar O VI Absorption in the Small Magellanic Cloud (2002)
Hoopes, Charles G., Sembach, Kenneth R., Howk, J. Christopher, Savage, Blair D., Fullerton, Alex W.
We present the results of a FUSE survey of O VI 1031.93 Angstrom and 1037.62 Angstrom absorption toward 18 OB stars in the Small Magellanic Cloud (SMC). We detect O VI along every sight line. The...
A limit on the metallicity of compact high-velocity clouds (2002)
Sembach, Kenneth R., Gibson, Bradley K., Fenner, Yeshe, Putman, Mary E.
There is a fortuitous coincidence in the positions of the quasar Ton S210 and the compact H I high-velocity cloud CHVC 224.0-83.4-197 on the sky. Using Far Ultraviolet Spectroscopic Explorer...
A limit on the metallicity of compact high-velocity clouds (2002)
Sembach, Kenneth R., Gibson, Bradley K., Fenner, Yeshe, Putman, Mary E.
There is a fortuitous coincidence in the positions of the quasar Ton S210 and the compact H I high-velocity cloud CHVC 224.0-83.4-197 on the sky. Using Far Ultraviolet Spectroscopic Explorer...
A limit on the metallicity of compact high-velocity clouds (2002)
Sembach, Kenneth R., Gibson, Bradley K., Fenner, Yeshe, Putman, Mary E.
There is a fortuitous coincidence in the positions of the quasar Ton S210 and the compact H I high-velocity cloud CHVC 224.0-83.4-197 on the sky. Using Far Ultraviolet Spectroscopic Explorer...
A limit on the metallicity of compact high-velocity clouds (2002)
Sembach, Kenneth R., Gibson, Bradley K., Fenner, Yeshe, Putman, Mary E.
There is a fortuitous coincidence in the positions of the quasar Ton S210 and the compact H I high-velocity cloud CHVC 224.0-83.4-197 on the sky. Using Far Ultraviolet Spectroscopic Explorer...
A limit on the metallicity of compact high-velocity clouds (2002)
Sembach, Kenneth R., Gibson, Bradley K., Fenner, Yeshe, Putman, Mary E.
There is a fortuitous coincidence in the positions of the quasar Ton S210 and the compact H I high-velocity cloud CHVC 224.0-83.4-197 on the sky. Using Far Ultraviolet Spectroscopic Explorer...
Howk, J. Christopher, Sembach, Kenneth R., Savage, Blair D., Massa, Derck, Friedman, Scott D., Fullerton, Alex W.
We present FUSE observations of interstellar O VI absorption towards 12 early-type stars in the Large Magellanic Cloud (LMC). O VI 1031.926 Ang absorption at LMC velocities is seen towards all 12...
An Atlas of FUSE Sight Lines Toward the Magellanic Clouds (2001)
Danforth, Charles W., Howk, J. Christopher, Fullerton, Alex W., Blair, William P., Sembach, Kenneth R.
We present an atlas of 57 Large Magellanic Cloud (LMC) and 37 Small Magellanic Cloud (SMC) observations obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite. The atlas highlights...
Molecular Hydrogen in High-Velocity Clouds (2001)
Richter, Philipp, Sembach, Kenneth R., Wakker, Bart P., Savage, Blair D.
We present Far Ultraviolet Spectroscopic Explorer (FUSE) observations of interstellar molecular hydrogen (H_2) in two Galactic high-velocity clouds (HVCs). Molecular hydrogen absorption is detected...
A FUSE Survey of Interstellar Molecular Hydrogen in the Small and Large Magellanic Clouds (2001)
Tumlinson, Jason, Shull, J. Michael, Rachford, Brian L., Browning, Matthew K., Snow, Theodore P., Fullerton, Alex W., ...
We describe a moderate-resolution FUSE survey of H2 along 70 sight lines to the Small and Large Magellanic Clouds, using hot stars as background sources. FUSE spectra of 67% of observed Magellanic...
The Hot Phase in the Galactic Disk (2001)
Jenkins, Edward B., Bowen, David V., Sembach, Kenneth R., Team, The FUSE Science
Spectra of about 150 early-type stars in the disk of the Milky Way recorded by the Far Ultraviolet Spectroscopic Explorer (FUSE) reveal absorption features from interstellar O VI, a tracer of...
O VI High Velocity Clouds: Where and What are They? (2001)
Our view of the high velocity cloud (HVC) system is changing dramatically with new observations from the Far Ultraviolet Spectroscopic Explorer mission and the Space Telescope Imaging Spectrograph...
Hoopes, Charles G., Sembach, Kenneth R., Howk, J. Christopher, Blair, William P.
We report a detection of far ultraviolet absorption from the supernova remnant SNR 0057 - 7226 in the Small Magellanic Cloud (SMC). The absorption is seen in the Far Ultraviolet Spectroscopic...
Sembach, Kenneth. R., Howk, J. Christopher, Savage, Blair. D., Shull, J. Michael
We present Far Ultraviolet Spectroscopic Explorer observations of the atomic and molecular absorption in high velocity cloud HVC 287.5+22.5+240, which lies in front of the ultraviolet-bright nucleus...
Empirical Verification of the Fe II Oscillator Strengths in the FUSE Bandpass (2000)
Howk, J. Christopher, Sembach, Kenneth R., Roth, Katherine C., Kruk, Jeffrey W.
We report empirical determinations of atomic oscillator strengths, or f-values, for 11 ground-state transitions of Fe II in the wavelength range 1050 to 1150 Ang. We use ultraviolet absorption line...
The Abundance of Interstellar Boron (2000)
Howk, J. Christopher, Sembach, Kenneth R., Savage, Blair D.
We use new Space Telescope Imaging Spectrograph (STIS) and archival Goddard High Resolution Spectrograph (GHRS) observations to study interstellar B II 1362 and O I 1355 absorption along seven...
Blair, William P., Sankrit, Ravi, Shelton, Robin, Sembach, Kenneth R., Moos, H. Warren, Raymond, John C., ...
We report a Far Ultraviolet Spectroscopic Explorer satellite observation of the supernova remnant N49 in the Large Magellanic Cloud, covering the 905 -- 1187 A spectral region. A 30'' square aperture...
Howk, J. Christopher, Sembach, Kenneth R.
We present a simple, effective approach for estimating the on-order backgrounds of spectra taken with the highest-resolution modes of the Space Telescope Imaging Spectrograph (STIS) on-board the...
Cha, Alexandra N., Sembach, Kenneth R.
We present high resolution (R~75,000), high signal-to-noise (S/N~100) Ca II $\lambda$3933.663 and Na I $\lambda\lambda$5889.951, 5895.924 spectra of 68 stars in the direction of the Vela supernova...
Modeling the Warm Ionized Interstellar Medium and Its Impact on Elemental Abundance Studies (1999)
Sembach, Kenneth R., Howk, J. Christopher, Ryans, Robert S. I., Keenan, Francis P.
We present model calculations of ionization fractions for elements in the warm (log T = 4), low-density photoionized interstellar medium (WIM) of the Milky Way. We model the WIM as a combination of...
Ionized Gas in Damped Lyman-alpha Systems and Its Effects on Elemental Abundance Studies (1999)
Howk, J. Christopher, Sembach, Kenneth R.
Recent high-resolution observations of metal absorption lines in high-redshift damped Ly-alpha systems have shown that Al III, a tracer of moderately-ionized gas, very often has a velocity structure...
HST-FOS Observations of M87: Ly-a Emission from the Active Galactic Nucleus (1999)
Sankrit, Ravi, Sembach, Kenneth R., Canizares, Claude R.
The Faint Object Spectrograph on the Hubble Space Telescope was used to obtain spectra of the central region of M87. These spectra cover the wavelength range 1140 - 1606 Angstrom and have a...
GHRS and ORFEUS-II Observations of the Highly Ionized Interstellar Medium Toward ESO141-055 (1999)
Sembach, Kenneth R., Savage, Blair D., Hurwitz, Mark
We present Goddard High Resolution Spectrograph and ORFEUS-II measurements of Si IV, CIV, N V, and O VI absorption in the interstellar medium of the Galactic disk and halo toward the nucleus of the...
The Distance to the Vela Supernova Remnant (1999)
Cha, Alexandra N., Sembach, Kenneth R., Danks, Anthony C.
We have obtained high resolution Ca II and Na I absorption line spectra toward 68 OB stars in the direction of the Vela Supernova Remnant. The stars lie at distances of 190 -- 2800 pc as determined...
J. Christopher, Kenneth R. Sembach
We present a simple, e†ective approach for estimating the on-order backgrounds of spectra taken with the highest resolution modes of the Space Telescope Imaging Spectrograph (STIS) on board the...
The Far Ultraviolet Spectroscopic Explorer (FUSE) is a NASA astronomy mission that will explore the 905-1187 A wavelength region at high spectral resolution. Funded by NASA's Explorer Program, this...
Highly Ionized High Velocity Clouds (1998)
Sembach, Kenneth R., Savage, Blair D., Lu, Limin, Murphy, Edward M.
We have recently used the Hubble Space Telescope to study a pair of high velocity clouds in the direction of Mrk 509 that have unusual ionization properties. They exhibit strong CIV absorption with...
Evolutionary Status of Dwarf ``Transition'' Galaxies (1998)
Knezek, Patricia M., Sembach, Kenneth R., Gallagher, John S.
We present deep B, R and Halpha imaging of 3 dwarf galaxies: NGC3377A, NGC4286, and IC3475. Based on previous broadband imaging and HI studies, these mixed-morphology galaxies were proposed by...
Sembach, Kenneth R., Savage, Blair D., Lu, Limin, Murphy, Edward M.
We have recently identified several high velocity (V < -100 km/s) clouds in the directions of Mrk 509 and PKS 2155-304 that have unusual ionization properties. The clouds exhibit strong C IV...
Lu, Limin, Savage, Blair D., Sembach, Kenneth R., Wakker, Bart P., Sargent, Wallace L. W., Oosterloo, Tom A.
We estimate the abundances of S and Fe in the high velocity cloud HVC 287.5+22.5+240, which has a velocity of +240 km/s with respect to the local standard of rest and is in the Galactic direction...