2001A&A...371..198G


Query : 2001A&A...371..198G

2001A&A...371..198G - Astronomy and Astrophysics, volume 371, 198-204 (2001/5-3)

A search for the optical counterpart to PSR B1821-24 in M 28.

GOLDEN A., BUTLER R.F. and SHEARER A.

Abstract (from CDS):

We have analysed archival HST/WFPC2 images in both the F555W & F814W bands of the core field of the globular cluster M 28 in an attempt to identify the optical counterpart of the magnetospherically active millisecond pulsar PSR B1821-24. Examination of the radio derived error circle yielded several potential candidates, down to a magnitude of V∼24.5 (V0∼23.0). Each were further investigated, both in the context of the CMD of M 28, and also with regard to phenomenological models of pulsar magnetospheric emission. The latter was based on both luminosity-spindown correlations and known spectral flux density behaviour in this regime from the small population of optical pulsars observed to date. None of the potential candidates exhibited emission expected from a magnetospherically active pulsar. The fact that the magnetic field & spin coupling for PSR B1821-24 is of a similar magnitude to that of the Crab pulsar in the vicinity of the light cylinder has suggested that the millisecond pulsar may well be an efficient nonthermal emitter. ASCA's detection of a strong synchrotron-dominated X-ray pulse fraction encourages such a viewpoint. We argue that only future dedicated 2-d high speed photometry observations of the radio error-circle can finally resolve this matter.

Abstract Copyright:

Journal keyword(s): pulsars: general - pulsars: individual PSR B1821-24 - globular clusters: general - globular clusters: individual M 28/NGC 6626 - Techniques: image processing - Astrometry

Nomenclature: Table 1: [GBS2001] NN (Nos 1-39).

Simbad objects: 46

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Number of rows : 46
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 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           ~ 4907 1
2 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5763 4
3 PSR B0540-69 Psr 05 40 10.84 -69 19 54.2           ~ 815 3
4 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2119 1
5 PSR B1509-58 Psr 15 13 55.52 -59 08 08.8     13.06     ~ 806 1
6 [GBS2001] 39 * 18 24 31.9138 -24 52 10.670           ~ 1 0
7 [GBS2001] 29 * 18 24 31.9200 -24 52 10.872           ~ 1 0
8 [GBS2001] 32 * 18 24 31.9228 -24 52 10.663           ~ 1 0
9 [GBS2001] 23 * 18 24 31.9245 -24 52 10.896           ~ 1 0
10 [GBS2001] 34 * 18 24 31.9254 -24 52 10.575           ~ 1 0
11 [GBS2001] 15 * 18 24 31.9403 -24 52 11.287           ~ 1 0
12 [GBS2001] 13 * 18 24 31.9410 -24 52 10.954           ~ 1 0
13 [GBS2001] 8 * 18 24 31.9483 -24 52 10.935           ~ 1 0
14 [GBS2001] 9 * 18 24 31.9502 -24 52 11.385           ~ 1 0
15 [GBS2001] 10 * 18 24 31.9539 -24 52 10.707           ~ 1 0
16 [GBS2001] 16 * 18 24 31.9573 -24 52 10.570           ~ 1 0
17 [GBS2001] 11 * 18 24 31.9586 -24 52 11.525           ~ 1 0
18 [GBS2001] 38 * 18 24 31.9595 -24 52 10.135           ~ 1 0
19 [GBS2001] 12 * 18 24 31.9623 -24 52 11.591           ~ 1 0
20 [GBS2001] 1 * 18 24 31.9685 -24 52 11.204           ~ 1 0
21 [GBS2001] 25 * 18 24 31.9704 -24 52 10.236           ~ 1 0
22 [GBS2001] 21 * 18 24 31.9730 -24 52 11.821           ~ 1 0
23 [GBS2001] 27 * 18 24 31.9820 -24 52 10.214           ~ 1 0
24 [GBS2001] 4 * 18 24 31.9840 -24 52 10.677           ~ 1 0
25 [GBS2001] 20 * 18 24 31.9927 -24 52 11.812           ~ 1 0
26 [GBS2001] 5 * 18 24 31.9929 -24 52 11.475           ~ 1 0
27 [GBS2001] 19 * 18 24 31.9958 -24 52 11.766           ~ 1 0
28 [GBS2001] 36 * 18 24 31.9968 -24 52 12.048           ~ 1 0
29 [GBS2001] 2 * 18 24 31.9983 -24 52 11.340           ~ 1 0
30 [GBS2001] 22 * 18 24 31.9995 -24 52 10.298           ~ 1 0
31 [GBS2001] 6 * 18 24 32.0031 -24 52 10.741           ~ 1 0
32 [GBS2001] 18 * 18 24 32.0055 -24 52 11.698           ~ 1 0
33 [GBS2001] 3 * 18 24 32.0060 -24 52 10.893           ~ 1 0
34 PSR J1824-2452A Psr 18 24 32.009 -24 52 11.10           ~ 447 2
35 [GBS2001] 7 * 18 24 32.0119 -24 52 11.382           ~ 1 0
36 [GBS2001] 17 * 18 24 32.0155 -24 52 11.526           ~ 1 0
37 [GBS2001] 30 * 18 24 32.0165 -24 52 11.877           ~ 1 0
38 [GBS2001] 35 * 18 24 32.0218 -24 52 11.872           ~ 1 0
39 [GBS2001] 24 * 18 24 32.0244 -24 52 11.697           ~ 1 0
40 [GBS2001] 14 * 18 24 32.0265 -24 52 10.942           ~ 1 0
41 [GBS2001] 31 * 18 24 32.0349 -24 52 11.672           ~ 1 0
42 [GBS2001] 26 * 18 24 32.0402 -24 52 11.463           ~ 1 0
43 [GBS2001] 37 * 18 24 32.0440 -24 52 11.642           ~ 1 0
44 [GBS2001] 28 * 18 24 32.047 -24 52 11.16           ~ 1 0
45 [GBS2001] 33 * 18 24 32.0518 -24 52 11.033           ~ 1 0
46 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 692 0

    Equat.    Gal    SGal    Ecl

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2021.07.27-08:30:11

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