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31 papers · 2 filters
Excess mid-IR emission in Cataclysmic Variables
G. Dubus, R. Campbell, B. Kern +2
We present a search for excess mid-IR emission due to circumbinary material in the orbital plane of cataclysmic variables (CVs). Our motivation stems from the fact that the strong…
An increased estimate of the merger rate of double neutron stars from observations of a highly relativistic system
M. Burgay, N. D'Amico, A. Possenti +10
The merger of close binary systems containing two neutron stars should produce a burst of gravitational waves, as predicted by the theory of general relativity. A reliable estimate…
Constraints on the Formation of PSR J0737-3039: the most probable isotropic kick magnitude
B. Willems, V. Kalogera
A strongly relativistic binary pulsar has been recently discovered with the 64m Parkes telescope (Burgay et al. 2003). Here we use the measured properties of this binary (masses an…
The Mouse That Soared: High Resolution X-ray Imaging of the Pulsar-Powered Bow Shock G359.23-0.82
B. M. Gaensler, E. van der Swaluw, F. Camilo +4
We present an observation with the Chandra X-ray Observatory of the unusual radio source G359.23-0.82 ("the Mouse"), along with updated radio timing data from the Parkes radio tele…
On the Chandra X-ray Sources in the Galactic Center
Krzysztof Belczynski, Ronald E. Taam
Recent deep Chandra surveys of the Galactic center region have revealed the existence of a faint, hard X-ray source population. While the nature of this population is unknown, it i…
First results from a Chandra survey of the 'Bar' region of the SMC
A. Zezas, J. C. McDowell, D. Hadzidimitriou +3
We present the first results from a Chandra survey of the central region of the Small Magellanic Cloud. We detect a total of 122 sources down to a limiting luminosity of ~4.3x10^{3…
Thermal Timescale Mass Transfer and the Evolution of White Dwarf Binaries
Natalia Ivanova, Ronald E. Taam
The evolution of binaries consisting of evolved main sequence stars (1 < M_d/Msun < 3.5) with white dwarf companions (0.7 < M_wd/Msun < 1.2) is investigated through the thermal mas…
X-Ray Binary Populations: The Luminosity Function of NGC1569
K. Belczynski, V. Kalogera, A. Zezas +1
Using the population synthesis code StarTrack we construct the first synthetic X-ray binary populations for direct comparison with the X-ray luminosity function (XLF) of NGC 1569 o…
An Observational Diagnostic for Ultraluminous X-Ray Sources
V. Kalogera, M. Henninger, N. Ivanova +1
We consider observational tests for the nature of Ultraluminous X-ray sources (ULXs). These must distinguish between thermal-timescale mass transfer on to stellar-mass black holes…
Magnetic Braking Revisited
Natalia Ivanova, Ronald E. Taam
We present a description for the angular momentum loss rate due to magnetic braking for late type stars taking into account recent observational data on the relationship between st…
On the Origin of X-ray Emission From Millisecond Pulsars in 47 Tuc
K. S. Cheng, Ronald E. Taam
The observed spectra and X-ray luminosities of millisecond pulsars in 47 Tuc can be interpreted in the context of theoretical models based on strong, small scale multipole fields o…
Could Black-Hole X-Ray Binaries Be Detected in Globular Clusters?
Vassiliki Kalogera, Andrew King, Frederic A. Rasio
We consider the implications of the presence of ~1 stellar-mass black hole (BH) at the center of a dense globular cluster. We show that BH X-ray binaries formed through exchange in…
Formation of Massive Black Holes in Dense Star Clusters. I. Mass Segregation and Core Collapse
M. Atakan Gürkan, Marc Freitag, Frederic A. Rasio
We study the early dynamical evolution of young, dense star clusters using Monte Carlo simulations for systems with up to N~10^7 stars. Rapid mass segregation of massive main-seque…
The Eye of the Tornado - an isolated, high mass young stellar object near the Galactic centre
M. G. Burton, J. S. Lazendic, F. Yusef-Zadeh +1
We present infrared (AAT, UKIRT) and radio (VLA, SEST) observations of the Eye of the Tornado, a compact source apparently near the head of the Tornado Nebula. The near-infrared Br…
The Origin of the Galactic Center Nonthermal Radio Filaments: Young Stellar Clusters
F. Yusef-Zadeh
The unusual class of magnetized nonthermal radio filaments (NTF), threads and streaks with their unique physical characteristics are found only within the inner couple of degrees o…
Astrophysical significance of detection of coalescing binaries with gravitational waves
T. Bulik, K. Belczynski, B. Rudak
We use the StarTrack stellar population synthesis code to analyze properties of double compact object binaries as sources of gravitational waves. Since the distribution of lifetime…
The Homogeneity of Interstellar Krypton in the Galactic Disk
Stefan I. B. Cartledge, David M. Meyer, J. T. Lauroesch
We present an analysis of high resolution HST Space Telescope Imaging Spectrograph (STIS) observations of Kr I 1236 Angstrom absorption in seven sight lines that probe a variety of…
Galactic Populations of Ultracompact Binaries
Krzysztof Belczynski, Ronald E. Taam
Recent RXTE and Chandra discoveries of low mass X-ray binaries with ultra-short orbital periods have initiated theoretical work on the origins of these peculiar systems. Using the…
Variable NaI Absorption toward rho Leo : Biased Neutral Formation in the Diffuse Interstellar Medium?
J. T. Lauroesch, David M. Meyer
We present multi-epoch KPNO Coude Feed observations of interstellar NaI and CaII absorption toward the bright star rho Leo. Comparisons of the NaI profiles observed over a period o…
HST Paschen alpha and 1.9 micron imaging of Sgr A West
N. Z. Scoville, S. R. Stolovy, M. Rieke +2
We present HST/NICMOS images at 0.2" resolution of the HI Paschen Alpha (PaA) emission line in a 70" x 90" region of the Galactic center centered on the non-thermal radio source Sg…
Nonthermal Emission from the Arches Cluster (G0.121+0.017) and the Origin of -ray Emission from 3EG J1746-2851
F. Yusef-Zadeh, M. Nord, M. Wardle +3
High resolution VLA observations of the Arches cluster near the Galactic center show evidence of continuum emission at 3.6, 6, 20 and 90cm. The continuum emission at 90cm is…
Molecular Line Observations of the Tornado Nebula and its Eye
J. Lazendic, M. Burton, F. Yusef-Zadeh +3
We present millimetre and NIR molecular-line observations of the Tornado nebula and its Eye. The observations were motivated by the presence of OH(1720 MHz) maser emission towards…
On the Origin of the High-Ionization Intermediate-Velocity Gas Toward HD 14434
David C. Knauth, J. Christopher Howk, Kenneth R. Sembach +2
We present Far Ultraviolet Spectroscopic Explorer and Space Telescope Imaging Spectrograph observations of high-ionization interstellar absorption toward HD 14434 [(l, b) = (135.1,…
Formation of Massive Black Holes in Dense Star Clusters
Frederic A. Rasio, Marc Freitag, M. Atakan Gürkan
We review possible dynamical formation processes for central massive black holes in dense star clusters. We focus on the early dynamical evolution of young clusters containing a fe…