165 citations · 743 across the 17 of their papers we have counts for
17 papers
Rapid dimming followed by a state transition: a study of the highly variable nuclear transient AT 2019avd over 1000+ days
Yanan Wang, Dheeraj R. Pasham, Diego Altamirano +16
The tidal disruption of a star around a supermassive black hole (SMBH) offers a unique opportunity to study accretion onto a SMBH on a human-timescale. We present results from our…
NICER observations of the black hole candidate MAXI J0637430 during the 2019-2020 Outburst
Arghajit Jana, Gaurava K. Jaisawal, Sachindra Naik +5
We present detailed timing and spectral studies of the black hole candidate MAXI J0637430 during its 2019-2020 outburst using observations with the {\em Neutron Star Interior Co…
A NICER View of a Highly-Absorbed Flare in GRS 1915+105
J. Neilsen, J. Homan, J. F. Steiner +4
After 26 years in outburst, the black hole X-ray binary GRS 1915+105 dimmed considerably in early 2018; its flux dropped sharply in mid-2019, and it has remained faint ever since.…
The SUrvey for Pulsars and Extragalactic Radio Bursts IV: Discovery and polarimetry of a 12.1-second radio pulsar
V. Morello, E. F. Keane, T. Enoto +19
We report the discovery of PSR~J22513711, a radio pulsar with a spin period of 12.1 seconds, the second longest currently known. Its timing parameters imply a characteristic age…
A NICER Spectrum of MAXI J1535-571: Near-Maximal Black Hole Spin and Potential Disk Warping
J. M. Miller, K. Gendreau, R. M. Ludlam +10
We report on a NICER observation of the Galactic X-ray binary and stellar-mass black hole candidate, MAXI J1535-571. The source was likely observed in an "intermediate" or "very hi…
A Persistent Disk Wind in GRS 1915+105 with NICER
Joey Neilsen, E. Cackett, R. A. Remillard +13
The bright, erratic black hole X-ray binary GRS 1915+105 has long been a target for studies of disk instabilities, radio/infrared jets, and accretion disk winds, with implications…
A Digital-Receiver for the Murchison Widefield Array
Thiagaraj Prabu, K. S. Srivani, D. Anish Roshi +55
An FPGA-based digital-receiver has been developed for a low-frequency imaging radio interferometer, the Murchison Widefield Array (MWA). The MWA, located at the Murchison Radio-ast…
A survey for transients and variables with the Murchison Widefield Array 32-tile prototype at 154 MHz
M. E. Bell, T. Murphy, D. L. Kaplan +55
We present a search for transient and variable radio sources at 154 MHz with the Murchison Widefield Array 32-tile prototype. Fifty-one images were obtained that cover a field of v…
A study of fundamental limitations to statistical detection of redshifted HI from the epoch of reionization
Nithyanandan Thyagarajan, N. Udaya Shankar, Ravi Subrahmanyan +46
In this paper we explore for the first time the relative magnitudes of three fundamental sources of uncertainty, namely, foreground contamination, thermal noise and sample variance…
The giant lobes of Centaurus A observed at 118 MHz with the Murchison Widefield Array
B. McKinley, F. Briggs, B. M. Gaensler +50
We present new wide-field observations of Centaurus A (Cen A) and the surrounding region at 118 MHz with the Murchison Widefield Array (MWA) 32-tile prototype, with which we invest…
Low Frequency Observations of the Moon with the Murchison Widefield Array
B. McKinley, F. Briggs, D. L. Kaplan +49
A new generation of low frequency radio telescopes is seeking to observe the redshifted 21 cm signal from the Epoch of Reionization (EoR), requiring innovative methods of calibrati…
The EoR Sensitivity of the Murchison Widefield Array
A. P. Beardsley, B. J. Hazelton, M. F. Morales +48
Using the final 128 antenna locations of the Murchison Widefield Array (MWA), we calculate its sensitivity to the Epoch of Reionization (EoR) power spectrum of red- shifted 21 cm e…
A new layout optimization technique for interferometric arrays, applied to the MWA
A. P. Beardsley, B. J. Hazelton, M. F. Morales +46
Antenna layout is an important design consideration for radio interferometers because it determines the quality of the snapshot point spread function (PSF, or array beam). This is…
X1908+075: A Pulsar Orbiting in the Stellar Wind of a Massive Companion
A. M. Levine, S. Rappaport, R. Remillard +1
We have observed the persistent but optically unidentified X-ray source X1908+075 with the PCA and HEXTE instruments on RXTE. The binary nature of this source was established by We…
Faint Infrared Flares from the Microquasar GRS 1915+105
S. Eikenberry, K. Matthews, M. Muno +3
We present simultaneous infrared and X-ray observations of the Galactic microquasar GRS 1915+105 using the Palomar 5-m telescope and Rossi X-ray Timing Explorer on July 10, 1998 UT…
Rxte Observations of a New X-Ray Transient: GRS 1737-31
Wei Cui, W. A. Heindl, J. H. Swank +4
We present the results from RXTE observations of a new X-ray transient, GRS 1737-31, near the Galactic center during an outburst. Over a span of two weeks, the source was seen to v…
Anticorrelated Hard/Soft X-Ray Emission from the X-Ray Burster 4U 0614+091
E. Ford, P. Kaaret, M. Tavani +6
We have detected transient X-ray activity from the X-ray burster 4U~0614+091 simultaneously with BATSE/CGRO (20-100 keV) and ASM/RXTE (1-12 keV). The peak fluxes reach approximatel…