Results 81 to 90 of about 6,438 (185)

Non-thermal pulsed X-ray emission from rotation-powered pulsars [PDF]

Astronomy & Astrophysics, 2006
We study the properties of the pulsed component of hard (> 2 keV) X-ray emission from pulsars based on the new version of the outer-gap model proposed by Zhang et al. (2004). In this outer-gap model, high-energy photons emitted by relativistic charged particles produce e(+/-) pairs through magnetic-pair production on their way from the outer gap to the
L. Zhang, Z. J. Jiang
openaire   +1 more source

An Algebraic Approach to Light–Matter Interactions

Advanced Physics Research, Volume 4, Issue 1, January 2025.
This is a review of an algebraic approach to light–matter interactions that is theoretically powerful and computationally friendly. Theoretical expressions can be developed and manipulated conveniently thanks to the generality of the basis on which the approach rests, and a compact notation.
Ivan Fernandez‐Corbaton
wiley   +1 more source

The Orbital Parameters of Gamma-Ray Binary PSR J2032+4127

The Astrophysical Journal
PSR J2032+4127 is the only gamma-ray binary that exhibits pulsations in gamma rays. Previous research has indicated that the pulsar and the Be star MT91 213 orbit each other in a highly eccentric orbit with an extremely long period, with the pulsar ...
Yu-Feng Luo, Shan-Shan Weng, Qing-Zhong Liu, Ming-Yu Ge, Han-Long Peng, Shi-Qi Zhou, Shi-Jie Gao, Yu-Jia Zheng, Yan Zhang   +8 more
doaj   +1 more source

XMM‐Newton Observations of the Peculiar Be X‐Ray Binary A0538‐66

Astronomische Nachrichten, Volume 346, Issue 1, January 2025.
ABSTRACT A0538‐66 is a neutron star/Be x‐ray binary located in the Large Magellanic Cloud and, since its discovery in the 70s, it showed a peculiar behavior that makes it a unique object in the high‐mass x‐ray binaries scene: the extremely eccentric orbit (e=0.72$$ e=0.72 $$), the short spin period of the neutron star (P=69$$ P=69 $$ ms), the episodes ...
Michela Rigoselli, Caterina Tresoldi, Lorenzo Ducci, Sandro Mereghetti   +3 more
wiley   +1 more source

Measuring Neutron Star Radii via Pulse Profile Modeling with NICER

, 2015
The Neutron-star Interior Composition Explorer (NICER) is an X-ray astrophysics payload that will be placed on the International Space Station. Its primary science goal is to measure with high accuracy the pulse profiles that arise from the non-uniform ...
Arzoumanian, Zaven, Baubock, Michi, Morsink, Sharon, Ozel, Feryal, Psaltis, Dimitrios   +4 more
core   +1 more source

Noisy Timing Behavior is a Feature of Central Compact Object Pulsars

The Astrophysical Journal
We present a timing study of the three known central compact object (CCO) pulsars, isolated cooling neutron stars in supernova remnants, using observations from Chandra, XMM-Newton, and NICER spanning two decades.
K. I. Perez, E. V. Gotthelf, J. P. Halpern   +2 more
doaj   +1 more source

Gamma Rays From Rotation-Powered Pulsars

, 2002
The seven known gamma-ray pulsars represent a very small fraction of the more than 1000 presently known radio pulsars, yet they can give us valuable information about pulsar particle acceleration and energetics. Although the theory of acceleration and high-energy emission in pulsars has been studied for over 25 years, the origin of the pulsed gamma ...
openaire   +2 more sources

NuSTAR observations of rotation-powered pulsars and magnetars [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractNASA's NuSTAR observatory is the first focusing hard X-ray telescope. Launched in June 2012, NuSTAR is sensitive in the 3–79 keV range with unprecedented ~17″ FWHM angular resolution above 12 keV, a result of its multilayer-coated optics and 10-m focal length.
V. M. Kaspi, H. An, M. Bachetti, E. Bellm, A. M. Beloborodov, S. Boggs, D. Chakrabarty, F. Christensen, B. Craig, F. Dufour, F. Harrison, E. V. Gotthelf, T. Kitaguchi, C. Kouveliotou, K. Mori, M. Pivovaroff, D. Stern, J. K. Vogel, W. Zhang   +18 more
openaire   +1 more source

The Role of XMM–Newton in the Investigation of Persistent BeXRBs

Astronomische Nachrichten, Volume 346, Issue 1, January 2025.
ABSTRACT The persistent BeXRBs are a class of high‐mass X‐ray binaries (HMXRBs), which are characterized by persistent low X‐ray luminosities (LX~1034$$ {L}_{\mathrm{X}}\sim {10}^{34} $$ erg s −1$$ {}^{-1} $$) and wide (Porb>$$ {P}_{\mathrm{orb}}> $$ 30 days), almost circular orbits. In these sources the NS is slowly rotating (with Pspin$$ {P}_{\mathrm{
Nicola La Palombara, Lara Sidoli, Sandro Mereghetti, Gian Luca Israel, Paolo Esposito   +4 more
wiley   +1 more source

More than meets the eye: magnetars in disguise

, 2012
It has recently been proposed that radio emission from magnetars can be evaluated using a "fundamental plane" in parameter space between pulsar voltage gap and ratio of X-ray luminosity Lx to rotational energy loss rate Edot.
Aguilera, Anderson, Arons, Becker, Beloborodov, Beloborodov, Bernardini, Colpi, Cooper, De Luca, De Luca, Durant, Esposito, Gelfand, Glampedakis, Goldreich, Gotthelf, Gunn, Halpern, Halpern, Halpern, Heyl, Ho, Ho, Kaminker, Kaminker, Kaplan, Kaspi, Kondratiev, Manchester, McLaughlin, Mereghetti, Muno, Ng, Perna, Pons, Pons, Pons, Price, Rea, Rea, Rea, Rea, Ruderman, Speagle, Spitkovsky, Thompson, Woods, Wynn C. G. Ho, Zhu, Zhu   +50 more
core   +1 more source