Results 51 to 60 of about 12,989 (225)

The early evolution of magnetar rotation – I. Slowly rotating ‘normal’ magnetars

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT In the seconds following their formation in core-collapse supernovae, ‘proto’-magnetars drive neutrino-heated magnetocentrifugal winds. Using a suite of two-dimensional axisymmetric magnetohydrodynamic simulations, we show that relatively slowly rotating magnetars with initial spin periods of P⋆0 = 50–500 ms spin down rapidly ...
Tejas Prasanna, Matthew S B Coleman, Matthias J Raives, Todd A Thompson   +3 more
openaire   +2 more sources

On the initial spin periods of magnetars born in weak supernova explosions and their gravitational wave radiation

European Physical Journal C: Particles and Fields
The initial spin periods of newborn magnetars are strongly associated with the origin of their strong magnetic fields, both of which can affect the electromagnetic radiation and gravitational waves (GWs) emitted at their birth. Combining the upper limit $
Yu-Long Yan, Quan Cheng, Xiao-Ping Zheng, Xia-Xia Ouyang   +3 more
doaj   +1 more source

High energy neutrinos from magnetars

, 2003
Magnetars can accelerate cosmic rays to high energies through the unipolar effect, and are also copious soft photon emitters. We show that young, fast-rotating magnetars whose spin and magnetic moment point in opposite directions emit high energy ...
A. K. Harding, Bing Zhang, Dai Z. G., E. Waxman, P. Meszaros, Paczynski B., Thompson C., Z. G. Dai, Zavlin V. E.   +8 more
core   +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

Upper Limits on the Radio Pulses from Magnetars and a Central Compact Object with FAST

The Astrophysical Journal
Magnetars and central compact objects (CCOs) are subgroups of neutron stars that show a number of properties distinguished from canonical radio pulsars. We performed radio observations of three magnetars, SGR 0418+5729, 1E 2259+586, and 4U 0142+61, and a
Wan-Jin Lu, Ping Zhou, Pei Wang, Yi-Xuan Shao, Xiang-dong Li, Jacco Vink, Di Li, Yang Chen   +7 more
doaj   +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

Estimation of the detected background by the future gamma ray transient mission CAMELOT

Astronomische Nachrichten, Volume 340, Issue 7, Page 666-673, August 2019., 2019
Abstract This study presents a background estimation for the CubeSats Applied for MEasuring and LOcalising Transients (CAMELOT), which is a proposed fleet of nanosatellites for the all‐sky monitoring and timing‐based localization of gamma ray transients with precise localization capability at low Earth orbits.
Jakub Řípa, Gábor Galgóczi, Norbert Werner, András Pál, Masanori Ohno, László Mészáros, Tsunefumi Mizuno, Norbert Tarcai, Kento Torigoe, Nagomi Uchida, Yasushi Fukazawa, Hiromitsu Takahashi, Kazuhiro Nakazawa, Naoyoshi Hirade, Kengo Hirose, Syohei Hisadomi, Teruaki Enoto, Hirokazu Odaka, Yuto Ichinohe, Zsolt Frei, László Kiss   +20 more
wiley   +1 more source

Magnetars

Magnetars are the most magnetic objects in the Universe, serving as unique laboratories to test physics under extreme magnetic conditions that cannot be replicated on Earth. They were discovered in the late 1970s through their powerful X-ray flares, and were subsequently identified as neutron stars characterized by steady and transient emission across ...
Rea, Nanda, De Grandis, Davide
openaire   +3 more sources

Pulsed γ-ray emission from magnetar 1E 2259+586 [PDF]

Journal of Astronomy and Space Sciences, 2013
Anomalous X-ray pulsars (AXPs) are thought to be magnetars which are young isolated neutron stars with extremely strong magnetic fields of >1014 Gauss.
Jason Hung Kit Wu, Chung Yue Hui, Regina Hsiu Hui Huang, Albert Kwok Hing Kong, Kwong Sang Cheng, Jumpei Takata, Pak Hin Thomas Tam, Eric Man Ho Wu, Joe Liu   +8 more
doaj   +1 more source

Beyond Accretion Limits: The Rise of Pulsating Gems

Astronomische Nachrichten, Volume 346, Issue 1, January 2025.
ABSTRACT The discovery of several ultraluminous X‐ray sources exhibiting fast and rapidly evolving X‐ray pulsations unequivocally associates these sources with accreting neutron stars orbiting relatively massive companion stars (> 8M ⊙$$ {}_{\odot } $$).
Gian Luca Israel, Roberta Amato, Matteo Imbrogno, Nicoló Oreste Pinciroli Vago, on behalf of a Larger Team, Guillermo Andres Rodríguez Castillo, Andrea Belfiore, Luigi Stella, Matteo Bachetti, Felix Fürst, Dom Walton, Matthew Middleton, Murray Brightman, Fabio Pintore, Ciro Pinto, Silvia Conforti, Luca Zampieri, Chiara Salvaggio, Anna Wolter, Andrea Tiengo, Andrea De Luca, Paolo Esposito, Ruben Salvaterra, Hannah Earnshaw, Tim Roberts, Andres Gúrpide, Sara Motta   +26 more
wiley   +1 more source