84 citations · 544 across the 26 of their papers we have counts for
27 papers
XClass: An Automated Multiwavelength Machine-Learning Pipeline for Classification of Extragalactic X-ray Sources. I. Pipeline Description
Blagoy Rangelov, Nicholas Moore, Haley Dutton +1
Most X-ray sources detected in nearby galaxies by the Chandra X-ray Observatory lack astrophysical classifications. We present XClass (X-ray Classifier for extragalactic sources),…
Neutron star heating vs. HST observations
Luis E. Rodríguez, Andreas Reisenegger, Denis González-Caniulef +5
Passively cooling neutron stars (NSs) should reach undetectably low surface temperatures K in less than yr. However, HST observations have revealed likely thermal…
A VLITE Search for Millisecond Pulsars in Globular Clusters: Discovery of a Pulsar in GLIMPSE-C01
Amaris V. McCarver, Thomas J. Maccarone, Scott M. Ransom +8
We present results from a search for pulsars in globular clusters, including the discovery of a new millisecond pulsar in the stellar cluster GLIMPSE-C01. We searched for low frequ…
Chandra X-ray Observatory Observations of 13 Fermi LAT Sources
Blagoy Rangelov, Hui Yang, Brice Williams +3
In the latest data release from the Fermi -ray Space Telescope (the 4th Fermi LAT 14 yr Catalog, or 4FGL), more than 50% of the Galactic sources are yet to be identified. We obs…
Population of X-ray Sources in the Intermediate-Age Cluster NGC 3532: a Test Bed for Machine-Learning Classification
Steven Chen, Oleg Kargaltsev, Hui Yang +4
Open clusters are thought to be the birth place of most stars in the Galaxy. Thus, they are excellent laboratories for investigating stellar evolution, and X-ray properties of vari…
Classifying Unidentified X-ray Sources in the Chandra Source Catalog Using a Multiwavelength Machine-learning Approach
Hui Yang, Jeremy Hare, Oleg Kargaltsev +3
The rapid increase in serendipitous X-ray source detections requires the development of novel approaches to efficiently explore the nature of X-ray sources. If even a fraction of t…
X-ray binaries in M51 I: catalog and statistics
Jared R. Rice, Blagoy Rangelov, Andrea Prestwich +3
We used archival data from the \emph{Chandra X-ray Observatory} (\emph{Chandra}) and the \emph{Hubble Space Telescope}, to identify 334 candidate X-ray binary (XRB) systems and the…
Runaway O-star Bow Shocks as Particle Accelerators? The Case of AE Aur revisited
Blagoy Rangelov, Thierry Montmerle, S. R. Federman +2
We present results of our Chandra/ACIS observations of the field centered on the fast, runaway O star AE Aur and its bow shock. Previous XMM-Newton observations revealed an X-ray "…
XMM-Newton and Chandra observations of the unidentified Fermi-LAT source 3FGL J1016.5-6034: A Young Pulsar with a Nebula?
Jeremy Hare, Igor Volkov, Oleg Kargaltsev +2
We report the discovery of a bright X-ray source in the XMM-Newton and Chandra X-ray Observatory (CXO) images of the unidentified Fermi-LAT source 3FGL J1016.5-6034. The XMM-Newton…
Hubble Space Telescope non-detection of PSR J2144-3933: the coldest known neutron star
S. Guillot, G. G. Pavlov, C. Reyes +4
We report non-detections of the yr old, slow, isolated, rotation-powered pulsar PSR J21443933 in observations with the Hubble Space Telescope in one optical…
A long hard-X-ray look at the dual active galactic nuclei of M51 with NuSTAR
M. Brightman, M. Baloković, M. Koss +14
We present a broadband X-ray spectral analysis of the M51 system, including the dual active galactic nuclei (AGN) and several off-nuclear point sources. Using a deep observation by…
Old but still warm: Far-UV detection of PSR B0950+08
G. G. Pavlov, B. Rangelov, O. Kargaltsev +3
We report on a Hubble Space Telescope detection of the nearby, old pulsar B0950+08 ( pc, spin-down age 17.5 Myr) in two far-ultraviolet (FUV) bands. We measured the me…
Pulsar Wind Nebulae Created by Fast-Moving Pulsars
Oleg Kargaltsev, George G. Pavlov, Noel Klingler +1
We review multiwavelength properties of pulsar wind nebulae (PWNe) created by supersonically moving pulsars and the effects of pulsar motion on the PWN morphologies and the ambient…
Chandra Observations of the field containing HESS J1616-508
Jeremy Hare, Oleg Kargaltsev, George G. Pavlov +2
We report the results of three Chandra observations covering most of the extent of the TeV gamma-ray source HESS J1616-508 and a search for a lower energy counterpart to this sourc…
CTIO, ROSAT HRI and Chandra ACIS Observations of the Archetypical Mixed-Morphology Supernova Remnant W28 (G6.4-0.1)
Thomas G. Pannuti, Jeonghee Rho, Oleg Kargaltsev +6
We present a joint analysis of optical emission-line and X-ray observations of the archetypical Galactic mixed-morphology supernova remnant (MMSNR) W28 (G6.4-0.1). MMSNRs comprise…
Hubble Space Telescope detection of the millisecond pulsar J2124-3358 and its far-ultraviolet bow shock nebula
B. Rangelov, G. G. Pavlov, O. Kargaltsev +4
We observed a nearby millisecond pulsar J2124-3358 with the Hubble Space Telescope in broad far-UV (FUV) and optical filters. The pulsar is detected in both bands with fluxes F(125…
Deep Chandra Observations of the Pulsar Wind Nebula Created by PSR B0355+54
Noel Klingler, Blagoy Rangelov, Oleg Kargaltsev +10
We report on Chandra X-ray Observatory (CXO) observations of the pulsar wind nebula (PWN) associated with PSR B0355+54 (eight observations with a 395 ks total exposure, performed o…
First Detection of a Pulsar Bow Shock Nebula in Far-UV: PSR J0437-4715
Blagoy Rangelov, George G. Pavlov, Oleg Kargaltsev +3
Pulsars traveling at supersonic speeds are often accompanied by cometary bow shocks seen in Halpha. We report on the first detection of a pulsar bow shock in the far-ultraviolet (F…
Chandra Observations of Outflows from PSR J1509-5850
Noel Klingler, Oleg Kargaltsev, Blagoy Rangelov +3
PSR J1509-5850 is a middle-aged pulsar with the period P ~ 89 ms, spin-down power Edot = 5.1 x 10^35 erg/s, at a distance of about 3.8 kpc. We report on deep Chandra X-ray Observat…
Magnesium-rich Ejecta in the SNR G284.31.8 Around the High-Mass Gamma-Ray Binary 1FGL J1018.65856
Brian J. Williams, Blagoy Rangelov, Oleg Kargaltsev +1
We present results from two {\it Chandra} observations of the 16.6 d X-ray/-ray high-mass binary 1FGL J1018.65856 located at the center of the supernova remnant G284.31.8.…
Multi-wavelength study of HESS J1741-302
Jeremy Hare, Blagoy Rangelov, Eda Sonbas +1
We present the results of two Chandra X-ray Observatory ( CXO) observations of TeV gamma-ray source HESS J1741-302A/B. Our analysis also includes GeV gamma-ray and radio data. We i…
An extended X-ray object ejected from the PSR B1259-63/LS 2883 binary
George G. Pavlov, Jeremy Hare, Oleg Kargaltsev +2
We present the analysis of the Chandra X-ray Observatory observations of the eccentric gamma-ray binary PSR B1259-63/LS 2883. The analysis shows that the extended X-ray feature see…
Multiwavelength study of the northeastern outskirts of the extended TeV source HESS J1809-193
Blagoy Rangelov, Bettina Posselt, Oleg Kargaltsev +3
HESS J1809-193 is an extended TeV gamma-ray source in the Galactic Plane. Multiwavelength observations of the HESS J1809-193 field reveal a complex picture. We present results from…
Chandra Imaging of Gamma-Ray Binaries
Oleg Kargaltsev, Blagoy Rangelov, Jeremy Hare +1
We review the multiwavelength properties of the few known gamma-ray binaries, focusing on extended emission recently resolved with Chandra. We discuss the implications of these fin…