2016A&A...593L...3C


Query : 2016A&A...593L...3C

2016A&A...593L...3C - Astronomy and Astrophysics, volume 593, L3-3 (2016/9-1)

High braking index pulsar PSR J1640-4631: low-mass neutron star with a large inclination angle?

CHEN W.-C.

Abstract (from CDS):

Recent timing observation constrained the braking index of the X-ray pulsar PSR J1640-4631 to be n=3.15±0.03, which is the highest value of all pulsars with measured braking indices so far. In this Letter, we investigate whether pulsar braking by combined between the magnetic dipole emission and the gravitational radiation might have a braking index greater than three. For conventional neutron star and low mass quark star candidates, the inferred ellipticities derived by the observed braking index are obviously much larger than the theoretical estimated maximum value. If PSR J1640-4631 is a low-mass neutron star with a mass of 0.1M, the inferred ellipticity can be approximately equal to the theoretical estimated maximum value. Because of the radio-quiet nature of this source, we employ the vacuum gap model developed by Ruderman and Sutherland to constrain the inclination angle to be 87.2-90°. Based on this, we propose that a low-mass neutron star with a large inclination angle can interpret the high braking index and the radio-quiet nature of this source. Future observations such as gravitational wave detection and long-term timing for this source are required to confirm or confute our scenario.

Abstract Copyright: © ESO, 2016

Journal keyword(s): pulsars: individual: PSR J1640-4631 - pulsars: general - stars: formation - gravitational waves

Simbad objects: 9

goto Full paper

goto View the references in ADS

Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5076 0
2 PSR B0943+10 Psr 09 46 07.31 +09 51 57.3           ~ 320 1
3 PSR J1119-6127 Psr 11 19 14.30 -61 27 49.5           ~ 371 1
4 PSR J1210-5226 Psr 12 10 00.88 -52 26 28.4           ~ 220 1
5 PSR J1518+4904 Psr 15 18 16.832 +49 04 34.19           ~ 165 1
6 PSR J1531-5610 Psr 15 31 27.91 -56 10 55.0           ~ 43 0
7 3EG J1639-4702 gam 16 40 30.0 -46 33 00           ~ 143 2
8 PSR J1640-4631 Psr 16 40 43.52 -46 31 35.4           ~ 47 0
9 4U 1746-371 LXB 17 50 12.66 -37 03 08.2     8.43     ~ 188 1

To bookmark this query, right click on this link: simbad:objects in 2016A&A...593L...3C and select 'bookmark this link' or equivalent in the popup menu


2022.10.02-02:38:40

© Université de Strasbourg/CNRS

    • Contact