Results 101 to 110 of about 24,425 (256)

Binary Pulsars: Observations and Implications [PDF]

Symposium - International Astronomical Union, 1987
The Galaxy contains a large number of neutron stars in gravitation-ally bound binary systems. Among the most fruitful of these to study have been the binary radio pulsars, of which seven are now known. Unlike the “accretion-powered” neutron stars located in mass-exchanging X-ray binary systems, the “rotation-powered” binary radio pulsars are found in ...
openaire   +1 more source

Spectral Studies of Super‐Eddington Accreting Neutron Stars in the Magellanic Clouds

Astronomische Nachrichten, Volume 346, Issue 1, January 2025.
ABSTRACT Major outbursts of BeXRBs offer a unique laboratory for studying accretion onto magnetized neutron stars (NSs) over a large dynamic range. The accreting material is entrained from the accretion disk by the strong magnetic field, and then channeled onto the NS, forming a so‐called accretion column (AC).
Georgios Vasilopoulos, Marios Kouzis, Brent F. West, Peter A. Becker   +3 more
wiley   +1 more source

An Alternative Explanation for the Helium Star Pulsar Binary J1928+1815: The Most Heavyweight Black Widow System to Date

The Astrophysical Journal
We present the results of deep near-infrared imaging of the recently discovered helium star pulsar binary J1928+1815 situated in the Galactic plane. Our observations did not achieve significant detections, providing limiting magnitudes of J = 23.7 and H =
Hang Gong, Alexey Bobrick, Francisco Garzón, Deven Bhakta, Thomas Maccarone, Sangita Kumari, Nieves Castro Rodríguez, Antonio Cabrera-Lavers, Arash Bahramian, Jifeng Liu   +9 more
doaj   +1 more source

Furnishing the Galaxy with Pulsars

, 2007
The majority of pulsar population synthesis studies performed to date have focused on isolated pulsar evolution. Those that have incorporated pulsar evolution within binary systems have tended to either treat binary evolution poorly of evolve the pulsar ...
A. Cumming, C. Bassa, James Murray, Jarrod Hurley, Matthew Bailes, Paul Kiel, V. M. Kaspi, Z. Wang   +7 more
core   +1 more source

The Anomalous Acceleration of PSR J2043+1711: Long-period Orbital Companion or Stellar Flyby?

The Astrophysical Journal
Based on the rate of change of its orbital period, PSR J2043+1711 has a substantial peculiar acceleration of 3.5 ± 0.8 mm s ^–1 yr ^–1 , which deviates from the acceleration predicted by equilibrium Milky Way (MW) models at a 4 σ level.
Thomas Donlon II, Sukanya Chakrabarti, Michael T. Lam, Daniel Huber, Daniel Hey, Enrico Ramirez-Ruiz, Benjamin Shappee, David L. Kaplan, Gabriella Agazie, Akash Anumarlapudi, Anne M. Archibald, Zaven Arzoumanian, Paul T. Baker, Paul R. Brook, H. Thankful Cromartie, Kathryn Crowter, Megan E. DeCesar, Paul B. Demorest, Timothy Dolch, Elizabeth C. Ferrara, William Fiore, Emmanuel Fonseca, Gabriel E. Freedman, Nate Garver-Daniels, Peter A. Gentile, Joseph Glaser, Deborah C. Good, Jeffrey S. Hazboun, Mark Huber, Ross J. Jennings, Megan L. Jones, Matthew Kerr, Duncan R. Lorimer, Jing Luo, Ryan S. Lynch, Alexander McEwen, Maura A. McLaughlin, Natasha McMann, Bradley W. Meyers, Cherry Ng, David J. Nice, Timothy T. Pennucci, Benetge B. P. Perera, Nihan S. Pol, Henri A. Radovan, Scott M. Ransom, Paul S. Ray, Ann Schmiedekamp, Carl Schmiedekamp, Brent J. Shapiro-Albert, Ingrid H. Stairs, Kevin Stovall, Abhimanyu Susobhanan, Joseph K. Swiggum, Michael A. Tucker, Haley M. Wahl   +55 more
doaj   +1 more source

Discovery of 10 pulsars in an Arecibo drift-scan survey

, 2005
We present the results of a 430-MHz survey for pulsars conducted during the upgrade to the 305-m Arecibo radio telescope. Our survey covered a total of 1147 square degrees of sky using a drift-scan technique.
A. M. Vazquez, A. S. Fruchter, Bhat, Camilo, Camilo, Camilo, Cordes, D. R. Lorimer, Damour, Davis, Dowd, Edwards, F. Camilo, Faulkner, Foster, Hansen, Hartman, I. H. Stairs, J. A. Eder, J. W. T. Hessels, Johnston, K. M. Xilouris, Kramer, Landolt, Lewandowski, Lommen, Lorimer, Lorimer, Lorimer, M. A. McLaughlin, M. S. E. Roberts, McLaughlin, McLaughlin, Morris, Nice, Nice, Nordtvedt, Nordtvedt, Phinney, Phinney, Radhakrishnan, Roberts, S. M. Ransom, Stairs, Stairs, Stairs, Taylor, van Kerkwijk, Wex, Wex, Wolszczan, Xilouris, Xilouris   +52 more
core   +1 more source

Exploring Unusual High-frequency Eclipses in MSP J1908+2105

The Astrophysical Journal
This paper presents a comprehensive study of the eclipse properties of the spider millisecond pulsar (MSP) J1908+2105, using wide-band observations from the uGMRT and Parkes UWL. For the first time, we observed that this pulsar exhibits extended eclipses
Ankita Ghosh, Bhaswati Bhattacharyya, Sangita Kumari, Simon Johnston, Patrick Weltevrede, Jayanta Roy   +5 more
doaj   +1 more source

Verification of f(R)-gravity in binary pulsars

EPJ Web of Conferences, 2016
We develop the parameterized post-Keplerian approach for class of analytic f (R)-gravity models. Using the double binary pulsar system PSR J0737-3039 data we obtain restrictions on the parameters of this class of f (R)-models and show that f (R)-gravity ...
Dyadina Polina, Alexeyev Stanislav, Capozziello Salvatore, De Laurentis Mariafelicia   +3 more
doaj   +1 more source

Bounding the mass of graviton in a dynamic regime with binary pulsars

, 2019
In Einstein's general relativity, gravity is mediated by a massless spin-2 metric field, and its extension to include a mass for the graviton has profound implication for gravitation and cosmology. In 2002, Finn and Sutton used the gravitational-wave (GW)
Ma, Bo-Qiang, Miao, Xueli, Shao, Lijing
core   +1 more source

First Systematic Study Reporting the Changes in Eclipse Cutoff Frequency for Pulsar J1544+4937

The Astrophysical Journal
We present results from long-term monitoring of frequency-dependent eclipses of the radio emission from PSR J1544+4937, which is a black widow spider millisecond pulsar (MSP) in a compact binary system.
Sangita Kumari, Bhaswati Bhattacharyya, Rahul Sharan, Devojyoti Kansabanik, Benjamin Stappers, Jayanta Roy   +5 more
doaj   +1 more source