133 citations · 939 across the 29 of their papers we have counts for
29 papers
Simultaneous Chandra and HST observations of the quiescent neutron-star low-mass X-ray binaries in 47 Tucanae
Maureen van den Berg, Liliana Rivera Sandoval, Craig O. Heinke +6
We present simultaneous Chandra X-ray Observatory and Hubble Space Telescope observations of three certain (X5, X7, W37) and two likely (X4, W17) quiescent neutron-star low-mass X-…
Discovery of a second eclipsing, bursting neutron-star low-mass X-ray binary in the globular cluster Terzan 6
Maureen van den Berg, Jeroen Homan, Craig O. Heinke +4
We have analyzed Chandra and Suzaku observations of the globular cluster Terzan 6, made when the recurrent transient GRS 1747-312 was in quiescence. Our analysis reveals the presen…
Long-term observations of pulsars in the globular clusters 47 Tucanae and M15
A. Ridolfi, P. C. C. Freire, M. Kramer +15
Multi-decade observing campaigns of the globular clusters 47 Tucanae and M15 have led to an outstanding number of discoveries. Here, we report on the latest results of the long-ter…
Mid-UV Studies of the Transitional Millisecond Pulsars XSS J12270-4859 and PSR J1023+0038 During Their Radio Pulsar States
L. E. Rivera Sandoval, J. V. Hernandez Santisteban, N. Degenaar +7
We report mid-UV (MUV) observations taken with HST/WFC3, Swift/UVOT and GALEX/NUV of the transitional millisecond pulsars XSS J12270-4859 and PSR J1023+0038 during their radio puls…
On the origin of the near-infrared emission from the neutron-star low-mass X-ray binary GX 9+1
Maureen van den Berg, Jeroen Homan
We have determined an improved position for the luminous persistent neutron-star low-mass X-ray binary and atoll source GX 9+1 from archival Chandra X-ray Observatory data. The new…
Long-term observations of the pulsars in 47 Tucanae. I. A study of four elusive binary systems
A. Ridolfi, P. Freire, P. Torne +11
For the past couple of decades, the Parkes radio telescope has been regularly observing the millisecond pulsars in 47 Tucanae (47 Tuc). This long-term timing program was designed t…
Deep radio imaging of 47 Tuc identifies the peculiar X-ray source X9 as a new black hole candidate
J. C. A. Miller-Jones, J. Strader, C. O. Heinke +8
We report the detection of steady radio emission from the known X-ray source X9 in the globular cluster 47 Tuc. With a double-peaked C IV emission line in its ultraviolet spectrum…
Discovery of near-ultraviolet counterparts to millisecond pulsars in the globular cluster 47 Tucanae
L. E. Rivera-Sandoval, M. van den Berg, C. O. Heinke +11
We report the discovery of the likely white dwarf companions to radio millisecond pulsars 47 Tuc Q and 47 Tuc S in the globular cluster 47 Tucanae. These blue stars were found in n…
Discovery of the near-infrared counterpart to the luminous neutron-star low-mass X-ray binary GX 3+1
Maureen van den Berg, Jeroen Homan, Joel K. Fridriksson +1
Using the High Resolution Camera onboard the Chandra X-ray Observatory, we have measured an accurate position for the bright persistent neutron-star X-ray binary and atoll source G…
M4 Core Project with HST - III. Search for variable stars in the primary field
V. Nascimbeni, L. R. Bedin, D. C. Heggie +14
We present the results of a photometric search for variable stars in the core of the Galactic globular cluster M4. The input data are a large and unprecedented set of deep Hubble S…
The M4 Core Project with HST -- II. Multiple Stellar Populations at the Bottom of the Main Sequence
A. P. Milone, A. F. Marino, L. R. Bedin +15
The M4 Core Project with HST is designed to exploit the Hubble Space Telescope to investigate the central regions of M4, the Globular Cluster closest to the Sun. In this paper we c…
The M4 Core Project with HST --- I. Overview and First-Epoch
L. R. Bedin, J. Anderson, D. C. Heggie +14
We present an overview of the ongoing Hubble Space Telescope large program GO-12911. The program is focused on the core of M4, the nearest Galactic globular cluster, and the observ…
A Chandra X-ray study of the interacting binaries in the old open cluster NGC6791
Maureen van den Berg, Frank Verbunt, Gianpiero Tagliaferri +3
We present the first X-ray study of NGC6791, one of the oldest open clusters known (8 Gyr). Our Chandra observation is aimed at uncovering the population of close interacting binar…
Neutron star atmosphere composition: the quiescent, low-mass X-ray binary in the globular cluster M28
Mathieu Servillat, C. O. Heinke, W. C. G. Ho +4
Using deep Chandra observations of the globular cluster M28, we study the quiescent X-ray emission of a neutron star in a low-mass X-ray binary in order to constrain the chemical c…
The ChaMPlane bright X-ray sources - Galactic longitudes l = 2-358 deg
Maureen van den Berg, Kyle Penner, JaeSub Hong +4
The Chandra Multiwavelength Plane (ChaMPlane) Survey aims to constrain the Galactic population of mainly accretion-powered, but also coronal, low-luminosity X-ray sources (Lx <~ 1e…
Spectroscopic Follow-up of X-ray Sources in the ChaMPlane Survey: Identification of a New Cataclysmic Variable
Mathieu Servillat, J. Grindlay, M. van den Berg +3
We present a multi-object optical spectroscopy follow-up study of X-ray sources in a field along the Galactic Plane (l=327.42 deg, b=2.26 deg) which is part of the Chandra Multi-wa…
A dwarf nova in the globular cluster M13
Mathieu Servillat, N. A. Webb, F. Lewis +4
Dwarf novae in globular clusters seem to be rare with only 13 detections in the 157 known Galactic globular clusters. We report the identification of a new dwarf nova in M13, the 1…
Discovery of a Significant Magnetic CV Population in the Limiting Window
JaeSub Hong, Maureen van den Berg, Jonathan E. Grindlay +2
[Abridged] We have discovered 10 periodic X-ray sources from the 1 Ms Chandra ACIS observation of the Limiting Window (LW), a low extinction region (A_V~3.9) at 1.4 Deg south of th…
Chandra X-ray Observations of 12 Millisecond Pulsars in the Globular Cluster M28
Slavko Bogdanov, Maureen van den Berg, Mathieu Servillat +7
We present a Chandra X-ray Observatory investigation of the millisecond pulsars (MSPs) in the globular cluster M28 (NGC 6626). In what is one of the deepest X-ray observations of a…
Interstellar extinction and the distribution of stellar populations in the direction of the ultra-deep Chandra Galactic field
M. Revnivtsev, M. van den Berg, R. Burenin +3
We studied the stellar population in the central 6.6x6.6arcmin,region of the ultra-deep (1Msec) Chandra Galactic field - the "Chandra bulge field" (CBF) approximately 1.5 degrees a…
A Chandra X-ray Observatory Study of PSR J1740--5340 and Candidate Millisecond Pulsars in the Globular Cluster NGC 6397
Slavko Bogdanov, Maureen van den Berg, Craig O. Heinke +3
We present a deep Chandra X-ray Observatory study of the peculiar binary radio millisecond pulsar PSR J1740--5340 and candidate millisecond pulsars (MSPs) in the globular cluster N…
Radial Distribution of X-ray Point Sources near the Galactic Center
Jaesub Hong, Maureen van den Berg, Jonathan E. Grindlay +1
(Abridged) We present the LogN-LogS and spatial distributions of X-ray point sources in seven Galactic Bulge (GB) fields within 4 deg from the Galactic Center (GC). We compare the…
Chandra Discovery of an Intermediate Polar in Baade's Window
JaeSub Hong, Maureen van den Berg, Silas Laycock +2
(Abridged) We have discovered an intermediate polar (IP) in the 100 ks Chandra observation of Baade's Window (BW), a low extinction region at ~ 4 deg south of the Galactic Center.…
A variable near-infrared counterpart to the neutron-star low-mass X-ray binary 4U 1705-440
Jeroen Homan, David L. Kaplan, Maureen van den Berg +1
We report the discovery of a near-infrared (nIR) counterpart to the persistent neutron-star low-mass X-ray binary 4U 1705-440, at a location consistent with its recently determined…