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29 papers · 2 filters
Three Additional Quiescent Low-Mass X-ray Binary Candidates in 47 Tucanae
C. O. Heinke, J. E. Grindlay, P. D. Edmonds
We identify through their X-ray spectra one certain (W37) and two probable (W17 and X4) quiescent low-mass X-ray binaries (qLMXBs) containing neutron stars in a long Chandra X-ray…
The Disruption of Stellar Clusters Containing Massive Black Holes near the Galactic Center
M. Atakan Gürkan, Frederic A. Rasio
We present results from dynamical Monte Carlo simulations of dense star clusters near the Galactic center. These clusters sink toward the center of the Galaxy by dynamical friction…
Are Supernova Kicks Responsible for X-ray Binary Ejection from Young Clusters?
J. Sepinsky, V. Kalogera, K. Belczynski
Recent Chandra observations of interacting and starburst galaxies have led us to investigate the apparent correlation between the positions of young star clusters and Chandra point…
Understanding Compact Object Formation and Natal Kicks I. Calculation Methods and the case of GRO J1655-40
B. Willems, M. Henninger, T. Levin +5
In recent years proper motion measurements have been added to the set of observational constraints on the current properties of Galactic X-ray binaries. We develop an analysis that…
Collisions Between Single Stars in Dense Clusters: Runaway Formation of a Massive Object
Marc Freitag, M. Atakan Gürkan, Frederic A. Rasio
Using Monte Carlo codes, we follow the collisional evolution of clusters in a variety of scenarios. We consider the conditions under which a cluster of main sequence stars may unde…
A 20cm Survey of the Galactic Center Region I: Detection of Numerous Linear Filaments
F. Yusef-Zadeh, J. Hewitt, W. Cotton
We present a sensitive 20cm VLA continuum survey of the Galactic center region using new and archival data based on multi-configuration observations taken with relatively unifor…
Hubble Space Telescope Observations of Element Abundances in Low-redshift Damped Lyman-alpha Galaxies and Implications for the Global Metallicity-Redshift Relation
Varsha P. Kulkarni, S. Michael Fall, James T. Lauroesch +4
Most models of cosmic chemical evolution predict that the mass-weighted mean interstellar metallicity of galaxies should rise with time from a low value solar at $z \si…
The Complex Interstellar Na I Absorption toward h and Chi Persei
Sean D. Points, James T. Lauroesch, David M. Meyer
Recent high spatial and spectral resolution investigations of the diffuse interstellar medium (ISM) have found significant evidence for small-scale variations in the interstellar g…
Large scale diffuse light in the Coma cluster: a multi-scale approach
C. Adami, E. Slezak, F. Durret +7
We have obtained wide field images of the Coma cluster in the B, V, R and I bands with the CFH12K camera at CFHT. In order to search for large scale diffuse emission, we have appli…
Pulsar Wind Nebulae and the X-Ray Emission of Non-Accreting Neutron Stars
K. S. Cheng, Ronald E. Taam, W. Wang
The general properties of the non-thermal non-pulsed X-ray emission of rotation powered pulsars are investigated in the context of a pulsar wind nebula model. An examination of the…
Metals and Dust in Intermediate-redshift Damped Ly-alpha Galaxies
Pushpa Khare, Varsha P. Kulkarni, James T. Lauroesch +3
We report spectroscopic observations with the Multiple Mirror Telescope for 11 damped Lyman-alpha absorbers (DLAs) or strong DLA candidates at 0.1 < z < 1.5, including several abso…
Mapping inspiral rates on population synthesis parameters
R. O'Shaughnessy, V. Kalogera, K. Belczynski
Formation rates of compact-object binaries are often derived from population synthesis calculations. However, such calculations depend sensitively on a relatively large number of m…
The INTEGRAL View of the Galactic Nucleus
A. Goldwurm, G. Belanger, P. Goldoni +15
We present the preliminary results of the observational campaign performed in 2003 to study the Galactic Nucleus with INTEGRAL. The mosaicked images obtained with the IBIS/ISGRI co…
Tidal Interactions and Disruptions of Giant Planets on Highly Eccentric Orbits
Joshua A. Faber, Frederic A. Rasio, Bart Willems
We calculate the evolution of planets undergoing a strong tidal encounter using smoothed particle hydrodynamics (SPH), for a range of periastron separations. We find that outside t…
The Homogeneity of Interstellar Oxygen in the Galactic Disk
Stefan I. B. Cartledge, J. T. Lauroesch, David M. Meyer +1
We present an analysis of high resolution HST Space Telescope Imaging Spectrograph (STIS) observations of O I 1356 and H I Lyman-alpha absorption in 36 sight lines that probe a var…
Chandra observations of the accretion-driven millisecond X-ray pulsars XTE J0929-314 and XTE J1751-305 in quiescence
Rudy Wijnands, Jeroen Homan, Craig O. Heinke +2
(Abridge) We observed the accreting millisecond X-ray pulsars XTE J0929-314 and XTE J1751-305 in their quiescent states using Chandra. From XTE J0929-314 we detected 22 photons (0.…
Shocked molecular hydrogen towards the Tornado nebula
J. S. Lazendic, M. Wardle, M. G. Burton +3
We present near-infrared and millimetre-line observations of the Tornado nebula (G357.7-0.1). We detected 2.12 micron_m H2 1-0 S(1) line emission towards the suspected site of inte…
X-ray Observations of Stellar Clusters Near the Galactic Center
C. Law, F. Yusef-Zadeh
We report the first detection of X-ray emission from the Quintuplet star cluster and compare its X-ray emission to that of the Arches star cluster. Four point sources are significa…
Run-away formation of intermediate-mass black holes in dense star clusters
Marc Freitag, M. Atakan Gürkan, Frederic A. Rasio
We consider spherical stellar clusters with a broad mass function and a relaxation time short enough so that the segregation of massive stars toward the centre occurs before they h…
A Comprehensive Study of Young Black Hole Populations
Krzysztof Belczynski, Aleksander Sadowski, Frederic A. Rasio
We present theoretical models of black hole (BH) populations in young stellar environments, such as starbursts and young star clusters. Using a population synthesis approach we com…
Pulsar Kicks and Spin Tilts in the Close Double Neutron Stars PSR J0737-3039, PSR B1534+12 and PSR B1913+16
B. Willems, V. Kalogera, M. Henninger
In view of the recent measurement of the scintillation velocity for PSR J0737-3039, we examine the complete set of constraints imposed on the pulsar B natal kicks (magnitude and or…
First Stellar Binary Black Holes: Strongest Gravitational Wave Burst Sources
Krzysztof Belczynski, Tomasz Bulik, Bronislaw Rudak
Evolution of first population of massive metal-free binary stars is followed. Due to the low metallicity, the stars are allowed to form with large initial masses and to evolve with…
Detached white dwarf main-sequence star binaries
B. Willems, U. Kolb
We considered the formation of detached white dwarf main-sequence star (WDMS) binaries through seven evolutionary channels subdivided according to the evolutionary process that giv…
Relativistic Calculations of Coalescing Binary Neutron Stars
Joshua Faber, Philippe Grandclément, Frederic Rasio
We have designed and tested a new relativistic Lagrangian hydrodynamics code, which treats gravity in the conformally flat approximation to general relativity. We have tested the r…