Results 71 to 80 of about 605 (176)

In-field Phasing at the Upgraded GMRT

The Astrophysical Journal
In time-domain radio astronomy with arrays, voltages from individual antennas are added together with proper delay and fringe correction to form the beam in real time.
Sanjay Kudale, Jayanta Roy, Jayaram N. Chengalur, Shyam Sharma, Sangita Kumari   +4 more
doaj   +1 more source

NICER Timing of the X-Ray Thermal Isolated Neutron Star RX J0806.4–4123

The Astrophysical Journal
The X-ray thermal isolated neutron star (XTINS) RX J0806.4–4123 shows interesting multiwavelength properties that seemingly deviate from those of similar neutron stars.
B. Posselt, G. G. Pavlov, W. C. G. Ho, F. Haberl   +3 more
doaj   +1 more source

Probing the Universe using Pulsar Timing Arrays [PDF]

EPJ Web of Conferences
Supermassive black holes (SMBH), found at the centers of galaxies, have been observed in the early Universe, yet their rapid growth remains an open question.
Falxa Mikel
doaj   +1 more source

Reprocessing of the Parkes 70 cm Survey and Discovery of a New Radio Pulsar in the Large Magellanic Cloud

The Astrophysical Journal
We have reprocessed the data archived from the Parkes 70 cm (PKS70) pulsar survey with an expanded dispersion measure (DM) search range and an acceleration search.
Wenke Xia, Fronefield Crawford, Shinnosuke Hisano, Tai Jespersen, Melanie Ficarra, Mckenzie Golden, Mia Gironda   +6 more
doaj   +1 more source

The NANOGrav 12.5-Year Data Set: Dispersion Measure Misestimations with Varying Bandwidths

The Astrophysical Journal
Noise characterization for pulsar-timing applications accounts for interstellar dispersion by assuming a known frequency dependence of the delay it introduces in the times of arrival (TOAs).
Sophia Valentina Sosa Fiscella, Michael T. Lam, Zaven Arzoumanian, Harsha Blumer, Paul R. Brook, H. Thankful Cromartie, Megan E. DeCesar, Paul B. Demorest, Timothy Dolch, Justin A. Ellis, Robert D. Ferdman, Elizabeth C. Ferrara, Emmanuel Fonseca, Nate Garver-Daniels, Peter A. Gentile, Deborah C. Good, Megan L. Jones, Duncan R. Lorimer, Jing Luo, Ryan S. Lynch, Maura A. McLaughlin, Cherry Ng, David J. Nice, Timothy T. Pennucci, Nihan S. Pol, Scott M. Ransom, Renée Spiewak, Ingrid H. Stairs, Kevin Stovall, Joseph K. Swiggum, Sarah J. Vigeland   +30 more
doaj   +1 more source

Identifying Pulsar Candidates in Interferometric Radio Images Using Scintillation

The Astrophysical Journal
Pulsars have been primarily detected by their narrow pulses or periodicity in time domain data. Interferometric surveys for pulsars are challenging due to the trade-off between beam sensitivity and beam size and the corresponding tradeoff between survey ...
Jitendra Salal, Shriharsh P. Tendulkar, Visweshwar Ram Marthi   +2 more
doaj   +1 more source

A Multifrequency Census of 100 Pulsars below 100 MHz with LWA: A Systematic Study of Flux Density, Spectra, Timing, Dispersion, Polarization, and Its Variation from a Decade of Observations

The Astrophysical Journal
We present a census of 100 pulsars, the largest below 100 MHz, including 94 normal pulsars and six millisecond pulsars, with the Long Wavelength Array (LWA).
P. Kumar, G. B. Taylor, K. Stovall, J. Dowell, S. M. White   +4 more
doaj   +1 more source

The Stack Search Tests on FAST Data: Discovery of Six Faint Isolated Millisecond Pulsars in NGC 6517 and NGC 7078 (M15)

The Astrophysical Journal Letters
We report the discovery of six faint millisecond pulsars (MSPs) in the globular clusters (GCs) NGC 6517 and NGC 7078 (M15) using the Five-hundred-meter Aperture Spherical radio Telescope.
Yinfeng Dai, Xing-Jiang Zhu, Zhichen Pan, Lei Qian, Li-yun Zhang, Dejiang Yin, Yu Pan, Bo Peng, Baoda Li, Yujie Lian, Yaowei Li, Yuxiao Wu, Menglin Huang, Qiaoli Hao, Xingyi Wang, Xianghua Niu, Jinyou Song, Minglei Guo, Shuangyuan Chen   +18 more
doaj   +1 more source

A 34 yr Timing Solution of the Redback Millisecond Pulsar Terzan 5A

The Astrophysical Journal
We present a 34 yr timing solution of the redback pulsar system Terzan 5A (Ter5A). Ter5A, also known as B1744−24A or J1748−2446A, has a 11.56 ms pulse period, a ~0.1 M _⊙ dwarf companion star, and an orbital period of 1.82 hr.
Alexandra C. Rosenthal, Scott M. Ransom, Kyle A. Corcoran, Megan E. DeCesar, Paulo C. C. Freire, Jason W. T. Hessels, Michael J. Keith, Ryan S. Lynch, Andrew Lyne, David J. Nice, Ingrid H. Stairs, Ben Stappers, Jay Strader, Stephen E. Thorsett, Ryan Urquhart   +14 more
doaj   +1 more source

Bounding the Photon Mass with Ultrawide Bandwidth Pulsar Timing Data and Dedispersed Pulses of Fast Radio Bursts

The Astrophysical Journal
Exploring the concept of a massive photon has been an important area in astronomy and physics. If photons have mass, their propagation in nonvacuum space would be affected by both the nonzero mass m _γ and the presence of a plasma medium. This would lead
Yu-Bin Wang, Xia Zhou, Abdusattar Kurban, Fa-Yin Wang   +3 more
doaj   +1 more source