Extensive population synthesis of isolated neutron stars with field decay

S. B. Popov, P. A. Boldin, J. A. Miralles, J. A. Pons, Bettina Posselt

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We perform population synthesis studies of different types of neutron stars (thermally emitting isolated neutron stars, normal radio pulsars, magnetars) taking into account the magnetic field decay and using results from the most recent advances in neutron star cooling theory. For the first time, we confront our results with observations using simultaneously the Log N - Log S distribution for nearby isolated neutron stars, the Log N - Log L distribution for magnetars, and the distribution of radio pulsars in the P - Ṗ diagram. For this purpose, we fix a baseline neutron star model (all microphysics input), and other relevant parameters to standard values (velocity distribution, mass spectrum, etc.), only allowing to vary the initial magnetic field strength. We find that our theoretical model is consistent with all sets of data if the initial magnetic field distribution function follows a log-normal law with <log(B0/[G])>∼13.25 and σ logB0∼0.6. The typical scenario includes about 10% of neutron stars born as magnetars, significant magnetic field decay during the first million years of a NS life (only about a factor of 2 for low field neutron stars but more than an order of magnitude for magnetars), and a mass distribution function dominated by low mass objects. This model explains satisfactorily all known populations. Evolutionary links between different subclasses may exist, although robust conclusions are not yet possible. We apply the obtained field distribution and the model of decay to study long-term evolution of neuton stars till the stage of accretion from the interstellar medium. It is shown that though the subsonic propeller stage can be relatively long, initially highly magnetized neutron stars (B0>∼10 13G) reach the accretion regime within the Galactic lifetime if their kick velocities are not too large. The fact that in previous studies made >10 years ago, such objects were not considered results in a slight increase of the Accretor fraction in comparison with earlier conclusions. Most of the neutron stars similar to the Magnificent seven are expected to become accreting from the interstellar medium after few billion years of their evolution. They are the main predecestors of accreting isolated neutron stars.

Original languageEnglish (US)
Title of host publicationAstrophysics of Neutron Stars 2010 - A Conference in Honor of M. Ali Alpar
Pages148-151
Number of pages4
DOIs
StatePublished - Oct 5 2011
EventAstrophysics of Neutron Stars 2010 - A Conference in Honor of M. Ali Alpar - Cesme, Izmir, Turkey
Duration: Aug 2 2010Aug 6 2010

Publication series

NameAIP Conference Proceedings
Volume1379
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherAstrophysics of Neutron Stars 2010 - A Conference in Honor of M. Ali Alpar
CountryTurkey
CityCesme, Izmir
Period8/2/108/6/10

Fingerprint

neutron stars
decay
synthesis
magnetars
magnetic fields
pulsars
distribution functions
propellers
mass distribution
fixing
mass spectra
field strength
velocity distribution
diagrams
cooling
stars
life (durability)

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Popov, S. B., Boldin, P. A., Miralles, J. A., Pons, J. A., & Posselt, B. (2011). Extensive population synthesis of isolated neutron stars with field decay. In Astrophysics of Neutron Stars 2010 - A Conference in Honor of M. Ali Alpar (pp. 148-151). (AIP Conference Proceedings; Vol. 1379). https://doi.org/10.1063/1.3629503
Popov, S. B. ; Boldin, P. A. ; Miralles, J. A. ; Pons, J. A. ; Posselt, Bettina. / Extensive population synthesis of isolated neutron stars with field decay. Astrophysics of Neutron Stars 2010 - A Conference in Honor of M. Ali Alpar. 2011. pp. 148-151 (AIP Conference Proceedings).
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Popov, SB, Boldin, PA, Miralles, JA, Pons, JA & Posselt, B 2011, Extensive population synthesis of isolated neutron stars with field decay. in Astrophysics of Neutron Stars 2010 - A Conference in Honor of M. Ali Alpar. AIP Conference Proceedings, vol. 1379, pp. 148-151, Astrophysics of Neutron Stars 2010 - A Conference in Honor of M. Ali Alpar, Cesme, Izmir, Turkey, 8/2/10. https://doi.org/10.1063/1.3629503

Extensive population synthesis of isolated neutron stars with field decay. / Popov, S. B.; Boldin, P. A.; Miralles, J. A.; Pons, J. A.; Posselt, Bettina.

Astrophysics of Neutron Stars 2010 - A Conference in Honor of M. Ali Alpar. 2011. p. 148-151 (AIP Conference Proceedings; Vol. 1379).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Popov SB, Boldin PA, Miralles JA, Pons JA, Posselt B. Extensive population synthesis of isolated neutron stars with field decay. In Astrophysics of Neutron Stars 2010 - A Conference in Honor of M. Ali Alpar. 2011. p. 148-151. (AIP Conference Proceedings). https://doi.org/10.1063/1.3629503