2010A&A...514A..74J


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET11:00:45

2010A&A...514A..74J - Astronomy and Astrophysics, volume 514, A74-74 (2010/5-1)

Long-term timing of four millisecond pulsars.

JANSSEN G.H., STAPPERS B.W., BASSA C.G., COGNARD I., KRAMER M. and THEUREAU G.

Abstract (from CDS):

We have timed four millisecond pulses, PSRsJ1721-2457, J1745-0952, J1810-2005, and J1918-0642, for up to a total of 10.5 years each using multiple telescopes in the European Pulsar Timing Array network: the Westerbork Synthesis Radio Telescope in The Netherlands, the Nancay Radio Telescope in France and the Lovell telescope at Jodrell Bank in the UK. The long time span has enabled us to measure the proper motions of J1745-0952 and J1918-0642, indicating that they have transverse velocities of 200(50) and 54(7)km/s respectively. We have obtained upper limits on the proper motion of J1721-2457 and J1810-2005, which imply that they have transverse velocities less than 140 and 400km/s respectively. In all cases, the velocities lie in the range typical of millisecond pulsars. We present pulse profiles for each pulsar taken from observations at multiple frequencies in the range of 350 to 2600MHz, and show that J1810-2005 shows significant profile evolution in this range. Using our multi-frequency observations, we measured the spectral indices for all four pulsars, and for J1810-2005 it appears to be very flat. The flux density of J1918-0642 shows extensive modulation which we attribute to the combined effects of refractive and diffractive scintillation. We discuss the possible use of including J1721-2457 or J1918-0642 in a pulsar timing array, and find that J1918-0642 will be useful to include when the timing precision of this pulsar is improved over the next few years. We have searched archival optical observations to detect companions of the binary pulsars, but none were detected. However, we provide lower limits on the masses of the white dwarf companions of PSRs J1745-0952 and J1918-0642.

Abstract Copyright:

Journal keyword(s): stars: neutron - pulsars: general - pulsars: individual: J1721-2457 - pulsars: individual: J1745-0952 - pulsars: individual: J1810-2005 - pulsars: individual: J1918-0642

Simbad objects: 9

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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 - 2021
#notes
1 PSR J0218+42 Psr 02 18 06.3604 +42 32 17.365           ~ 299 2
2 PSR J0437-47 Psr 04 37 15.7976203608 -47 15 08.536908257           DC 762 0
3 PSR J0751+1807 Psr 07 51 09.1539 +18 07 38.335           ~ 257 1
4 PSR J1012+5307 Psr 10 12 33.4341531837 +53 07 02.564526788     19.5     DA 320 1
5 PG 1525-071 HS* 15 28 11.5771272664 -07 16 32.898620269 13.658 14.85 14.89 15.14 15.197 sdO 35 0
6 PSR J1721-2457 Psr 17 21 05.496 -24 57 06.10           ~ 23 0
7 PSR J1745-0952 Psr 17 45 09.1400 -09 52 39.670           ~ 20 0
8 PSR J1810-2005 Psr 18 10 58.988 -20 05 08.30           ~ 30 0
9 PSR J1918-0642 Psr 19 18 48.0363 -06 42 34.800           ~ 73 0

    Equat.    Gal    SGal    Ecl

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2020.11.25-11:00:45

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