scholarly journals An Updated Galactic Double Neutron Star Merger Rate Based on Radio Pulsar Populations

2020 ◽  
Vol 4 (2) ◽  
pp. 22 ◽  
Author(s):  
Nihan Pol ◽  
Maura McLaughlin ◽  
Duncan R. Lorimer
Keyword(s):  
Neutron Star ◽  
Radio Pulsar ◽  
Pulsar Populations ◽  
Merger Rate

scholarly journals EARLY PHASES OF DIFFERENT TYPES OF ISOLATED NEUTRON STAR

2005 ◽  
Vol 14 (06) ◽  
pp. 1075-1082 ◽  
Author(s):  
AŞKIN ANKAY ◽  
SERKAN ŞAHIN ◽  
GÖKÇE KARANFIL ◽  
EFE YAZGAN
Keyword(s):  
Neutron Star ◽  
Thermal Neutron ◽  
Early Phase ◽  
Radio Pulsar ◽  
Radio Pulsars ◽  
X Ray ◽  
Soft Gamma Repeaters ◽  
Different Types ◽  
Early Phases

Two Galactic isolated strong X-ray pulsars seem to be in the densest environments compared to other types of Galactic pulsar. X-ray pulsar J1846-0258 can be in an early phase of anomalous X-ray pulsars and soft gamma repeaters if its average braking index is ~1.8–2.0. X-ray pulsar J1811-1925 must have a very large average braking index (~11) if this pulsar was formed by SN 386AD. This X-ray pulsar can be in an early phase of the evolution of the radio pulsars located in the region P ~ 50–150 ms and Ṗ ~ 10-14–10-16 ss -1 of the P–Ṗ diagram. X-ray/radio pulsar J0540-69 seems to be evolving in the direction to the dim isolated thermal neutron star region on the P–Ṗ diagram. Possible progenitors of different types of neutron star are also discussed.

scholarly journals Short GRBs: Opening Angles, Local Neutron Star Merger Rate, and Off-axis Events for GRB/GW Association

2018 ◽  
Vol 857 (2) ◽  
pp. 128 ◽  
Author(s):  
Zhi-Ping Jin ◽  
Xiang Li ◽  
Hao Wang ◽  
Yuan-Zhu Wang ◽  
Hao-Ning He ◽  
...  
Keyword(s):  
Neutron Star ◽  
Merger Rate ◽  
Short Grbs

scholarly journals NUCLEOSYNTHESIS CONSTRAINTS ON THE NEUTRON STAR-BLACK HOLE MERGER RATE

2014 ◽  
Vol 795 (1) ◽  
pp. L9 ◽  
Author(s):  
A. Bauswein ◽  
R. Ardevol Pulpillo ◽  
H.-T. Janka ◽  
S. Goriely
Keyword(s):  
Black Hole ◽  
Neutron Star ◽  
Merger Rate

scholarly journals Masses of double neutron star mergers

2020 ◽  
Vol 639 ◽  
pp. A123 ◽  
Author(s):  
Matthias U. Kruckow
Keyword(s):  
Neutron Star ◽  
Gravitational Wave ◽  
Milky Way ◽  
Radio Pulsar ◽  
Population Synthesis ◽  
Radio Pulsars ◽  
Wave Observation ◽  
Binary Evolution ◽  
Star Binary

Aims. I aim to explain the mass discrepancy between the observed double neutron-star binary population by radio pulsar observations and gravitational-wave observation. Methods. I performed binary population synthesis calculations and compared their results with the radio and the gravitational-wave observations simultaneously. Results. Simulations of binary evolution were used to link different observations of double neutron star binaries with each other. I investigated the progenitor of GW190425 in more detail. A distribution of masses and merger times of the possible progenitors is presented. Conclusions. A mass discrepancy between the radio pulsars in the Milky Way with another neutron star companion and the inferred masses from gravitational-wave observations of those kind of merging systems is naturally found in binary evolution.

scholarly journals Search for neutron star binaries in the Local Group galaxies using LISA

2019 ◽  
Vol 489 (4) ◽  
pp. 4513-4519 ◽  
Author(s):  
Naoki Seto
Keyword(s):  
Neutron Star ◽  
Local Group ◽  
Design Sensitivity ◽  
Signal To Noise ◽  
Frequency Distributions ◽  
Current Design ◽  
R Process ◽  
Merger Rate ◽  
Process Elements

ABSTRACT We discuss the prospects of LISA for detecting neutron star binaries (NSBs) in the Local Group galaxies such as LMC and M31. Using the recently estimated merger rate ${\rm 1540 \, Gpc^{-3}\, yr^{-1}}$ and inversely applying the conventional arguments based on the B-band galaxy luminosities, we estimate the frequency distributions of NSBs in the local galaxies. We find that, after 10 yr observation with its current design sensitivity, LISA might detect ∼5 NSBs both in LMC and M31 with signal-to-noise ratios larger than 10. Some of the NSBs might be three-dimensionally localized well within LMC. These binaries will be useful for studying various topics including the origin of r-process elements.

scholarly journals Recycling in progress: RXTE discovery of the first accretion-powered millisecond pulsar

2000 ◽  
Vol 177 ◽  
pp. 643-648
Author(s):  
M. van der Klis
Keyword(s):  
Magnetic Field ◽  
Neutron Star ◽  
Binary System ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Radio Pulsar ◽  
Millisecond Pulsar ◽  
X Ray ◽  
Millisecond Radio

AbstractThe discovery is reported of the first accretion-powered millisecond pulsar, SAX J 1808.4–3658. This 2.5 millisecond pulsar has a magnetic field strength of 1–10108Gauss and has all the characteristics of the long-predicted millisecond radio pulsar progenitor, a neutron star in an X-ray binary system where the process of recycling is taking place at this time.

scholarly journals What will eROSITA reveal among X-ray faint isolated neutron stars?

2017 ◽  
Vol 13 (S337) ◽  
pp. 112-115
Author(s):  
Adriana M. Pires
Keyword(s):  
Neutron Star ◽  
Neutron Stars ◽  
Radio Pulsar ◽  
X Rays ◽  
Evolutionary Models ◽  
X Ray ◽  
Sky Survey ◽  
Γ Ray ◽  
Unique Potential

AbstractSince the discovery of the first radio pulsar fifty years ago, the population of neutron stars in our Galaxy has grown to over 2,600. A handful of these sources, exclusively seen in X-rays, show properties that are not observed in normal pulsars. Despite their scarcity, they are key to understanding aspects of the neutron star phenomenology and evolution. The forthcoming all-sky survey of eROSITA will unveil the X-ray faint end of the neutron star population at unprecedented sensitivity; therefore, it has the unique potential to constrain evolutionary models and advance our understanding of the sources that are especially silent in the radio and γ-ray regimes. In this contribution I discuss the expected role of eROSITA, and the challenges it will face, at probing the galactic neutron star population.

scholarly journals Cosmic neutron-star merger rate and gravitational waves constrained by the r-process nucleosynthesis

2015 ◽  
Vol 455 (1) ◽  
pp. 17-34 ◽  
Author(s):  
Elisabeth Vangioni ◽  
Stéphane Goriely ◽  
Frédéric Daigne ◽  
Patrick François ◽  
Krzysztof Belczynski
Keyword(s):  
Neutron Star ◽  
Gravitational Waves ◽  
R Process ◽  
Merger Rate

scholarly journals Probing X-ray emission in different modes of PSR J1023+0038 with a radio pulsar scenario

2019 ◽  
Vol 629 ◽  
pp. L8 ◽  
Author(s):  
S. Campana ◽  
A. Miraval Zanon ◽  
F. Coti Zelati ◽  
D. F. Torres ◽  
M. C. Baglio ◽  
...  
Keyword(s):  
Neutron Star ◽  
Spectral Properties ◽  
Source Parameters ◽  
High Mode ◽  
Radio Pulsar ◽  
Emission Model ◽  
Emission Mechanism ◽  
Pulsar Emission ◽  
X Ray ◽  
Pulsar Wind

Transitional pulsars provide us with a unique laboratory to study the physics of accretion onto a magnetic neutron star. PSR J1023+0038 (J1023) is the best studied of this class. We investigate the X-ray spectral properties of J1023 in the framework of a working radio pulsar during the active state. We modelled the X-ray spectra in three modes (low, high, and flare) as well as in quiescence, to constrain the emission mechanism and source parameters. The emission model, formed by an assumed pulsar emission (thermal and magnetospheric) plus a shock component, can account for the data only adding a hot dense absorber covering ∼30% of the emitting source in high mode. The covering fraction is similar in flaring mode, thus excluding total enshrouding, and decreases in the low mode despite large uncertainties. This provides support to the recently advanced idea of a mini-pulsar wind nebula (PWN), where X-ray and optical pulsations arise via synchrotron shock emission in a very close (∼100 km, comparable to a light cylinder), PWN-like region that is associated with this hot absorber. In low mode, this region may expand, pulsations become undetectable, and the covering fraction decreases.

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