Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
A search for the optical counterpart to PSR B1821-24 in M 28
Autore:
Golden, A; Butler, RF; Shearer, A;
Indirizzi:
Natl Univ Ireland, Galway, Ireland Natl Univ Ireland Galway IrelandNatl Univ Ireland, Galway, Ireland
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 1, volume: 371, anno: 2001,
pagine: 198 - 204
SICI:
1432-0746(200105)371:1<198:ASFTOC>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY LUMINOSITY; IMAGE-RECONSTRUCTION; GLOBULAR-CLUSTERS; CRAB PULSAR; RADIATION; WFPC2; EMISSION; M28;
Keywords:
pulsars : general; pulsars : individual PSR B1821-24 globular clusters : general; globular clusters : individual M 28/NGC 6626; Techniques : image processing Astrometry;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Golden, A Natl Univ Ireland, Galway, Ireland Natl Univ Ireland Galway Ireland niv Ireland, Galway, Ireland
Citazione:
A. Golden et al., "A search for the optical counterpart to PSR B1821-24 in M 28", ASTRON ASTR, 371(1), 2001, pp. 198-204

Abstract

We have analysed archival HST/WFPC2 images in both the F555W & F814W bandsof 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 severalpotential candidates, down to a magnitude of V similar to 24.5 (V-0 similar to 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 smallpopulation 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 canfinally resolve this matter.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/20 alle ore 10:41:03