-
ACS Virgo Cluster Survey. III. M87
The ACIS instrument on board the Chandra X-Ray Observatory has been used to carry out the first systematic study of low-mass X-ray binaries (LMXBs) in M87, the giant elliptical... -
XMM-Newton LMXB in NGC4649
We present an XMM-Newton X-ray observation of the X-ray bright E2 elliptical galaxy NGC 4649. In addition to bright diffuse emission, we resolve 158 discrete sources, ~50 of... -
LS I +65 010 radial velocities and Halpha EW
We report on a 3yr spectroscopic monitoring program of the Halpha emission in the massive X-ray binary LS I +65 010 = 2S 0114+650, which consists of a B supergiant and a slowly... -
LS I +61 303 radial velocities and Halpha EW
We present the results of an Halpha monitoring campaign on the BeXRB and microquasar system LS I +61 303. We use radial velocity measurements of HeI lines in our spectra to... -
K-band light curve of GRS 1915+105
We present the results of 7 years of K-band monitoring of the low-mass X-ray binary GRS 1915+105. Positive correlations between the infrared flux and the X-ray flux and X-ray... -
Spectro. monitoring of HDE 245770 and X Per
We present results from an H{alpha} monitoring campaign of the Be X-ray binary systems HDE 245770 = A0535+26 and X Per. We use the H{alpha} equivalent widths together with... -
X-ray variability in 4U 1636-53
We have studied the rapid X-ray time variability in 149 pointed observations with the Rossi X-Ray Timing Explorer (RXTE)'s Proportional Counter Array of the atoll source 4U... -
SFXTs observed by Swift. I. Outside outbursts
Supergiant fast X-ray transients (SFXTs) are a new class of high-mass X-ray binaries (HMXBs) discovered thanks to the monitoring of the Galactic plane performed with the... -
LMXBs in early-type galaxies. I. Chandra
We present a Chandra survey of LMXBs in 24 early-type galaxies. Correcting for detection incompleteness, the X-ray luminosity function (XLF) of each galaxy is consistent with a... -
Modulation in the X-ray binary SAX J1808.4-3658
We report on optical imaging of the X-ray binary SAX J1808.4-3658 with the 8m Gemini South Telescope. The binary, containing an accretion-powered millisecond pulsar, appears to... -
Chandra observations of NGC 4636
We present the X-ray point-source population in the nearby Virgo elliptical galaxy NGC 4636 from three Chandra X-ray observations. These observations, totaling ~193ks after time... -
The Chandra survey of the SMC "Bar". II.
We present the most likely optical counterparts of 113 X-ray sources detected in our Chandra survey of the central region of the Small Magellanic Cloud (SMC) based on the... -
Radial velocities of LSI+61 303 and LS 5039
LS I +61 303 and LS 5039 are two of only a handful of known high-mass X-ray binaries (HMXBs) that exhibit very high energy emission in the MeV-TeV range, and these "{gamma}-ray... -
Determination of black hole masses
We present a study of correlations between X-ray spectral and timing properties observed from a number of Galactic black hole (BH) binaries during hard-soft state spectral... -
The Fermi LAT sky as seen by INTEGRAL/IBIS
In this Letter we present the result of the cross correlation between the fourth INTEGRAL/IBIS soft gamma-ray catalog, in the range 20-100keV, and the Fermi LAT bright source... -
Radio and X-ray observations of Aql X-1
The 2009 November outburst of the neutron star X-ray binary Aquila X-1 (Aql X-1) was observed with unprecedented radio coverage and simultaneous pointed X-ray observations,... -
BH spin-orbit misalignment in Galactic XRBs
In black hole (BH) X-ray binaries (XRBs), a misalignment between the spin axis of the BH and the orbital angular momentum can occur during the supernova explosion that forms the... -
Chandra X-ray sources of NGC 1399
We present a wide-field study of the globular cluster (GC)/low-mass X-ray binary (LMXB) connection in the giant elliptical NGC 1399. The large field of view of the Advanced... -
XMM-Newton X-ray sources in NGC 6553
This paper reports the search for quiescent low-mass X-ray binaries (qLMXBs) in the globular cluster (GC) NGC 6553 using an XMM-Newton observation designed specifically for that... -
RXTE observations of 4U 1728-34
We present an analysis of the spectral properties observed in X-rays from neutron star X-ray binary 4U 1728-34 during transitions between the low- and high-luminosity states...
