2004ApJ...604..328R


Query : 2004ApJ...604..328R

2004ApJ...604..328R - Astrophys. J., 604, 328-338 (2004/March-3)

Green Bank Telescope discovery of two binary millisecond pulsars in the globular cluster M30.

RANSOM S.M., STAIRS I.H., BACKER D.C., GREENHILL L.J., BASSA C.G., HESSELS J.W.T. and KASPI V.M.

Abstract (from CDS):

We report the discovery of two binary millisecond pulsars in the core-collapsed globular cluster M30 using the Green Bank Telescope (GBT) at 20 cm. PSR J2140-2310A (M30A) is an eclipsing 11 ms pulsar in a 4 hr circular orbit, and PSR J2140-23B (M30B) is a 13 ms pulsar in an as yet undetermined but most likely highly eccentric (e>0.5) and relativistic orbit. Timing observations of M30A with a 20 month baseline have provided precise determinations of the pulsar's position (within 4" of the optical centroid of the cluster) and spin and orbital parameters, which constrain the mass of the companion star to be m2≳0.1M. The position of M30A is coincident with a possible thermal X-ray point source found in archival Chandra data, which is most likely caused by emission from hot polar caps on the neutron star. In addition, there is a faint (V555∼23.8) star visible in archival Hubble Space Telescope (HST) F555W data that may be the companion to the pulsar. Eclipses of the pulsed radio emission from M30A by the ionized wind from the compact companion star show a frequency-dependent duration (∝ν–α with α∼0.4-0.5) and delay the pulse arrival times near eclipse ingress and egress by up to 2-3 ms. Future observations of M30 may allow both the measurement of post-Keplerian orbital parameters from M30B and the detection of new pulsars through the effects of strong diffractive scintillation.

Abstract Copyright:

Journal keyword(s): Galaxy: Globular Clusters: Individual: Messier Number: M30 - Stars: Pulsars: Individual: Alphanumeric: PSR J2140-2310A - Radio Continuum: Stars - Stars: Neutron

Nomenclature: Text: [RSB2004] M30A (Nos A-B).

CDS comments: Parag. 5.1 : PSR 2127-11C is a misprint for 2127+11C

Simbad objects: 33

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Number of rows : 33
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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3653 0
2 PSR B0021-72W Psr 00 24 06.0580 -72 04 49.088           ~ 69 1
3 PSR J0024-72H Psr 00 24 06.686 -72 04 06.74           ~ 55 1
4 Cl Pal 1 GlC 03 33 20.04 +79 34 51.8   17.2       ~ 210 1
5 M 79 GlC 05 24 10.59 -24 31 27.3   9.21 8.16     ~ 742 0
6 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2326 0
7 PSR J1518+0204B Psr 15 18 31.458 +02 05 15.47           ~ 38 1
8 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1829 0
9 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 648 0
10 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1724 0
11 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2061 0
12 M 62 GlC 17 01 12.60 -30 06 44.5   8.55 7.39     ~ 540 0
13 PSR J1701-3006B Psr 17 01 12.6704 -30 06 49.040           ~ 26 0
14 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1955 0
15 NGC 6342 GlC 17 21 10.14 -19 35 14.7   11.25 10.01     ~ 254 0
16 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1844 1
17 PSR J1740-5340 Psr 17 40 44.589 -53 40 40.90   17.43   16.25   ~ 135 2
18 NAME MSP 6397-A BY* 17 40 44.615 -53 40 41.59   17.36 16.65     ~ 21 1
19 PSR B1744-24A Psr 17 48 02.255 -24 46 36.90           ~ 189 0
20 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 730 1
21 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 797 0
22 PSR J1750-3703A Psr 17 50 13.8016 -37 03 10.950           ~ 13 1
23 NGC 6539 GlC 18 04 49.74 -07 35 09.1           ~ 203 0
24 PSR J1802-07 Psr 18 04 49.8954 -07 35 24.690     12.33     ~ 92 2
25 PSR J1959+2048 Psr 19 59 36.7480 +20 48 14.599   20.4       ~ 724 2
26 M 75 GlC 20 06 04.841 -21 55 20.14     8.26     ~ 326 0
27 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2969 0
28 PSR J2129+1209C Psr 21 30 01.2030 +12 10 38.159           ~ 175 2
29 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 936 1
30 PSR J2140-23B Psr 21 40 22.0 -23 10 47           ~ 6 0
31 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 952 0
32 Cl* NGC 7099 GWY 3611 * 21 40 22.314 -23 10 40.10   16.14 15.51     ~ 3 0
33 PSR J2140-2310A Psr 21 40 22.40610 -23 10 48.7936           ~ 20 0

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2021.07.31-19:07:24

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