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296 papers · 1 filter
UV Imaging Polarimetry of the peculiar Seyfert 2 galaxy Mrk 477
Makoto Kishimoto, Laura E. Kay, Robert Antonucci +3
We present the results of UV imaging polarimetry of the Seyfert 2 galaxy Mrk 477 taken by the Faint Object Camera onboard the Hubble Space Telescope (HST). From a previous HST UV i…
Abundances of Deuterium, Oxygen, and Nitrogen in the Local Interstellar Medium: Overview of First Results from the Far Ultraviolet Spectroscopic Explorer Mission
H. W. Moos, K. R. Sembach, A. Vidal-Madjar +33
Observations obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) have been used to determine the column densities of D I, O I, and N I along seven sight lines that prob…
The Solar Neighborhood VI: New Southern Stars Identified by Optical Spectroscopy
Todd J. Henry, Lucianne M. Walkowicz, Todd C. Barto +1
Broadband optical spectra are presented for 34 known and candidate nearby stars in the southern sky. Spectral types are determined using a new method that compares the entire spect…
MSX Observations of Diffuse UV Emission in Orion
Jayant Murthy, R. C. Henry, L. J. Paxton +1
We have observed intense diffuse radiation in the UV (1400 A - 2600 A) from three fields around M42 in Orion. Intensities of 20000 photons cm-2 s-1 sr-1 A-1 were observed to the ea…
The contribution of Quasars to the Far Infrared Background
G. Risaliti, M. Elvis, R. Gilli
Recent observational results obtained with SCUBA, COBE and ISO have greatly improved our knowledge of the infrared and sub-mm background radiation. These limits become constraining…
LOTIS, Super-LOTIS, SDSS and Tautenburg Observations of GRB 010921
H. S. Park, G. G. Williams, D. H. Hartmann +36
We present multi-instrument optical observations of the High Energy Transient Explorer (HETE-2)/Interplanetary Network (IPN) error box of GRB 010921. This event was the first gamma…
Testing the Supernova, Cepheid, and Early-type Galaxy Distance Scales
John P. Blakeslee
I summarize recent work comparing relative distances measured to individual galaxies with independent methods. The comparisons include: ground-based surface brightness fluctuation…
Far-Infrared Galaxies in the Far-Ultraviolet
Jeffrey D. Goldader, Gerhardt Meurer, Timothy M. Heckman +4
In an effort to better understand the UV properties of ultraluminous infrared galaxies (ULIGs), and compare them to the rest-frame UV properties of high redshift sub-mm and Lyman-b…
The KPNO International Spectroscopic Survey. III. [O III]-selected Survey List
John J. Salzer, Caryl Gronwall, Vicki L. Sarajedini +8
The KPNO International Spectroscopic Survey (KISS) is an objective-prism survey for extragalactic emission-line objects. It combines many of the features of previous slitless spect…
The Effect of Changes in the ASCA Calibration on the Fe-Kalpha Lines in Active Galaxies
T. Yaqoob, U. Padmanabhan, T. Dotani +1
The ASCA calibration has evolved considerably since launch and indeed, is still evolving. There have been concerns in the literature that changes in the ASCA calibration have resul…
Deuterium Toward WD1634-573: Results from the Far Ultraviolet Spectroscopic Explorer (FUSE) Mission
B. E. Wood, J. L. Linsky, G. Hebrard +5
We use Far Ultraviolet Spectrocopic Explorer (FUSE) observations to study interstellar absorption along the line of sight to the white dwarf WD1634-573 (d=37.1+/-2.6 pc). Combining…
Chandra Observations of the Eastern Limb of the Vela Supernova Remnant
P. P. Plucinsky, R. K Smith, R. J. Edgar +5
We present results from two Chandra/ACIS observations of the so-called Vela ``Bullet D'' region on the eastern limb of the Vela supernova remnant. The Bullet D region is a bright X…
Constraints on the mass-profile of the lens galaxy G2237+0305
J. S. B. Wyithe, E. Agol, E. L. Turner +1
Published parametric models of the Einstein Cross gravitational lens demonstrate that the image geometry can be reproduced by families of models. In particular, the slope of the ma…
The size of a quasar's mid-IR emission region inferred from microlensed images of Q2237+0305
J. S. B. Wyithe, E. Agol, C. J. Fluke
We use published mid-IR and V-band flux ratios for images A and B of Q2237+0305 to demonstrate that the size of the mid-IR emission region has a scale comparable to or larger than…
Folding and Stretching in a Go-like Model of Titin
Marek Cieplak, Trinh Xuan Hoang, Mark O. Robbins
Mechanical stretching of the I27 domain of titin and of its double and triple repeats are studied through molecular dynamics simulations of a Go-like model with Lennard-Jones conta…
Thermal Folding and Mechanical Unfolding Pathways of Protein Secondary Structures
Marek Cieplak, Trinh Xuan Hoang, Mark O. Robbins
Mechanical stretching of secondary structures is studied through molecular dynamics simulations of a Go-like model. Force vs. displacement curves are studied as a function of the s…
Ultraviolet HST Snapshot Survey of 3CR Radio Source Counterparts at Low Redshift
Mark G. Allen, William B. Sparks, Anton Koekemoer +6
We present ultraviolet images of 27 3CR radio galaxies with redshifts z<0.1 that have been imaged with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Tel…
Deuterium Abundance Toward WD2211-495: Results from the Far Ultraviolet Spectroscopic Explorer (FUSE) Mission
G. Hebrard, M. Lemoine, A. Vidal-Madjar +15
We present a deuterium abundance analysis of the line of sight toward the white dwarf WD2211-495 observed with the Far Ultraviolet Spectroscopic Explorer (FUSE). Numerous interstel…
Deuterium abundance toward G191-B2B: Results from the Far Ultraviolet Spectroscopic Explorer (FUSE) Mission
M. Lemoine, A. Vidal-Madjar, G. Hebrard +19
High-resolution spectra of the hot white dwarf G191-B2B, covering the wavelength region 905-1187A, were obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE). This data w…
Hydrogen-bonded Silica Gels Dispersed in a Smectic Liquid Crystal: A Random Field XY System
S. Park, R. L. Leheny, R. J. Birgeneau +3
The effect on the nematic to smectic-A transition in octylcyanobiphenyl (8CB) due to dispersions of hydrogen-bonded silica (aerosil) particles is characterized with high-resolution…
The Global Content, Distribution, and Kinematics of Interstellar O VI in the Large Magellanic Cloud
J. Christopher Howk, Kenneth R. Sembach, Blair D. Savage +3
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…
Spectral Evidence for Widespread Galaxy Outflows at z>4
Brenda Frye, Tom Broadhurst, Narciso Benitez
We present discovery spectra of a sample of eight lensed galaxies at high redshift, 3.7<z<5.2, selected by their red colors in the fields of four massive clusters: A1689, A2219, A2…
Pseudorapidity distributions of charged particles from Au+Au collisions at the maximum RHIC energy, Sqrt(s_NN) = 200 GeV
BRAHMS Collaboration, I. G. Bearden
We present charged particle densities as a function of pseudorapidity and collision centrality for the 197Au+197Au reaction at Sqrt{s_NN}=200 GeV. For the 5% most central events we…
Cracks and Crazes: On calculating the macroscopic fracture energy of glassy polymers from molecular simulations
Jörg Rottler, Sandra Barsky, Mark O. Robbins
We combine molecular dynamics simulations of deformations at the submicron scale with a continuum fracture mechanics calculation for the onset of crack propagation to predict the m…