14.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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122 papers · 2 filters
Where Centaurus A gets its X-ray knottiness
D. M. Worrall, M. Birkinshaw, R. P. Kraft +15
We report an X-ray spectral study of the transverse structure of the Centaurus A jet using new data from the Chandra Cen A Very Large Project. We find that the spectrum steepens wi…
Variable Low-Mass X-ray Binaries in Early-Type Galaxies
Gregory R. Sivakoff, Andrés Jordán, Adrienne M. Juett +2
As the Chandra X-ray Observatory mission matures, increasing numbers of nearby galaxies are being observed multiple times, sampling the variability of extragalactic X-ray binaries…
The Optical-Radio Mapping: the kinetic efficiency of Radio-Loud AGNs
Francesco Shankar, Alfonso Cavaliere, Michele Cirasuolo +1
We constrain the mean kinetic efficiency of radio-loud active galactic nuclei by using an optically selected sample for which both the optical and the radio luminosity functions (L…
The pulsation modes of the pre-white dwarf PG 1159-035
J. E. S. Costa, S. O. Kepler, D. E. Winget +74
PG 1159-035, a pre-white dwarf with T_eff=140,000 K, is the prototype of both two classes: the PG1159 spectroscopic class and the DOV pulsating class. Previous studies of PG 1159-0…
The First Mid-Infrared Spectra of Cool White Dwarfs
Mukremin Kilic, Piotr M. Kowalski, Fergal Mullally +2
We present the first mid-infrared spectra of two cool white dwarfs obtained with the Spitzer Space Telescope. We also present 3.5-8 micron photometry for 19 cool white dwarfs with…
Missing Baryons and the Warm-Hot Intergalactic Medium
F. Nicastro, Smita Mathur, Martin Elvis
Stars and gas in galaxies, hot intracluster medium, and intergalactic photo-ionized gas make up at most half of the baryons that are expected to be present in the universe. The maj…
Masses of Nix and Hydra
David J. Tholen, Marc W. Buie, William M. Grundy +1
A four-body orbit solution for the Pluto system yields GM values of 870.3 +/- 3.7, 101.4 +/- 2.8, 0.039 +/- 0.034, and 0.021 +/- 0.042 km3 sec-2 for Pluto, Charon, Nix, and Hydra,…
Primordial Nucleosynthesis in the Precision Cosmology Era
Gary Steigman
Primordial nucleosynthesis provides a probe of the Universe during its early evolution. Given the progress exploring the constituents, structure, and recent evolution of the Univer…
Estimating the total infrared luminosity of galaxies up to z~2 from mid- and far-infrared observations
N. Bavouzet, H. Dole, E. Le Floc'h +3
We present the observed correlations between rest-frame 8, 24, 70 and 160 um monochromatic luminosities and measured total infrared luminosities L_IR of galaxies detected by Spitze…
Finding Planets Around White Dwarf Remnants of Massive Stars
Andrew Gould, Mukremin Kilic
Planet frequency shows a strong positive correlation with host mass from the hydrogen-burning limit to M ~ 2Msun. No search has yet been conducted for planets of higher-mass hosts…
Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei
The Pierre Auger Collaboration
Data collected by the Pierre Auger Observatory provide evidence for anisotropy in the arrival directions of the cosmic rays with the highest energies, which are correlated with the…
Go Long, Go Deep: Finding Optical Jet Breaks for Swift-Era GRBs with the LBT
X. Dai, P. M. Garnavich, J. L. Prieto +20
Using the 8.4m Large Binocular Telescope, we observed six GRB afterglows from 2.8 hours to 30.8 days after the burst triggers to systematically probe the late time behaviors of aft…
Extended-Source Effect and Chromaticity in Two-Point-Mass Microlensing
Ondrej Pejcha, David Heyrovsky
We explore the sensitivity of two-point-mass gravitational microlensing to the extended nature of the source star, as well as the related sensitivity to its limb darkening. We demo…
Upper limit on the diffuse flux of UHE tau neutrinos from the Pierre Auger Observatory
The Pierre Auger Collaboration
The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau-neutrinos that interact in the Earth's crust. Tau leptons from charged-cur…
Dynamical Evolution of Globular Clusters in Hierarchical Cosmology
Oleg Y. Gnedin, Jose L. Prieto
We probe the evolution of globular clusters that could form in giant molecular clouds within high-redshift galaxies. Numerical simulations demonstrate that the large and dense enou…
A New Ultracool White Dwarf Discovered in the SuperCOSMOS Sky Survey
N. Rowell, M. Kilic, N. C. Hambly
We present photographic B, R and I photometry, and optical and near-infrared spectroscopy, of a new ultracool white dwarf (UCWD) discovered in the SuperCOSMOS Sky Survey. The spect…
Low-Mass X-ray Binaries and Globular Clusters in Centaurus A
Andres Jordan, Gregory R. Sivakoff, Dean E. McLaughlin +19
We present results of Hubble Space Telescope and Chandra X-ray Observatory observations of globular clusters (GCs) and low-mass X-ray binaries (LMXBs) in the central regions of Cen…
Microlensing Searches for Planets: Results and Future Prospects
B. Scott Gaudi
Microlensing is potentially sensitive to multiple-planet systems containing analogs of all the solar system planets except Mercury, as well as to free floating planets. I review th…
Constraints on the correlation between QSO luminosity and host halo mass from high-redshift quasar clustering
Martin White, Paul Martini, J. D. Cohn
Recent measurements of high-redshift QSO clustering from the Sloan Digital Sky Survey indicate that QSOs at z~4 have a bias b~14. We find that this extremely high clustering amplit…
Circumscribing Late Dark Matter Decays Model Independently
Hasan Yuksel, Matthew D. Kistler
A number of theories, spanning a wide range of mass scales, predict dark matter candidates that have lifetimes much longer than the age of the universe, yet may produce a significa…
The SEGUE Stellar Parameter Pipeline. III. Comparison with High-Resolution Spectroscopy of SDSS/SEGUE Field Stars
C. Allende Prieto, T. Sivarani, T. C. Beers +14
We report high-resolution spectroscopy of 125 field stars previously observed as part of the Sloan Digital Sky Survey and its program for Galactic studies, the Sloan Extension for…
The SEGUE Stellar Parameter Pipeline. II. Validation with Galactic Globular and Open Clusters
Y. S. Lee, T. C. Beers, T. Sivarani +13
We validate the performance and accuracy of the current SEGUE (Sloan Extension for Galactic Understanding and Exploration) Stellar Parameter Pipeline (SSPP), which determines stell…
Big Bang Nucleosynthesis Constraints on the Self-Gravity of Pressure
Saul Rappaport, Josiah Schwab, Scott Burles +1
Using big bang nucleosynthesis and present, high-precision measurements of light element abundances, we constrain the self-gravity of radiation pressure in the early universe. The…
On the size of the Fe II emitting region in the AGN Akn 120
Charles A. Kuehn, Jack A. Baldwin, Bradley M. Peterson +1
We present a reverberation analysis of the strong, variable optical Fe II emission bands in the spectrum of Akn 120, a low-redshift AGN which is one of the best candidates for such…