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The Astronomical Journal

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CHANDRA ACIS SURVEY OF X-RAY POINT SOURCES IN 383 NEARBY GALAXIES. I. THE SOURCE CATALOG

The Chandra data archive is a treasure for various studies, and in this paper we exploit this valuable resource to study the X-ray point source populations in nearby galaxies. By 2007 December 14,…
IOP Publishing (opens in a new tab)

Puzzling accretion onto a black hole in the ultraluminous X-ray source M 101 ULX-1

Optical spectroscopic monitoring of M 101 ULX-1 confirms the previous suggestion that the system contains a Wolf-Rayet star, and reveals that the orbital period is 8.2 days, and argues that the black hole has a minimum mass of 5, and more probably a mass of 20−30, but is very unlikely to be an intermediate-mass black hole.
Nature (opens in a new tab)

A wide star–black-hole binary system from radial-velocity measurements

Radial-velocity measurements of a Galactic B-type star show a dark companion that seems to be a black hole of about 68 solar masses, in a widely spaced binary system.
Springer (opens in a new tab)

A DETERMINATION OF THE SPIN OF THE BLACK HOLE PRIMARY IN LMC X-1

The first extragalactic X-ray binary, LMC X-1, was discovered in 1969. In the 1980s, its compact primary was established as the fourth dynamical black hole candidate. Recently, we published accurate…
IOP Publishing (opens in a new tab)

The Flare Catalog and the Flare Activity in the Kepler Mission

We present a flare catalog of the Kepler mission using the long-cadence data of Data Release 25. This catalog comprises 3420 flare stars and 162,262 flare events. A comparison shows that the flare…
IOP Publishing (opens in a new tab)

CHANDRA ACIS SURVEY OF X-RAY POINT SOURCES: THE SOURCE CATALOG

The Chandra archival data is a valuable resource for various studies on different X-ray astronomy topics. In this paper, we utilize this wealth of information and present a uniformly processed data…
IOP Publishing (opens in a new tab)

Ultraluminous X-Ray Sources in Nearby Galaxies from ROSAT High Resolution Imager Observations I. Data Analysis

X-ray observations have revealed in other galaxies a class of extranuclear X-ray point sources with X-ray luminosities of 1039-1041 ergs s-1, exceeding the Eddington luminosity for stellar mass X-ray…
IOP Publishing (opens in a new tab)

A CENSUS OF X-RAY NUCLEAR ACTIVITY IN NEARBY GALAXIES

We have studied the X-ray nuclear activity of 187 nearby (distance less than 15 Mpc) galaxies observed with Chandra/ACIS. We found that 86 of them have a pointlike X-ray core, consistent with an…
IOP Publishing (opens in a new tab)

The Optical Counterpart of an Ultraluminous X-Ray Object in M81

Ultraluminous X-ray objects (ULXs) are off-nucleus point sources with LX = 1039-1041 ergs s-1; they are among the most poorly understood X-ray sources. To help understand their nature, we are trying…
IOP Publishing (opens in a new tab)
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