KNOWN PULSARS IDENTIFIED IN THE GMRT 150 MHz ALL-SKY SURVEY

被引:30
作者
Frail, D. A. [1 ]
Jagannathan, P. [1 ,2 ]
Mooley, K. P. [3 ]
Intema, H. T. [1 ,4 ]
机构
[1] Natl Radio Astron Observ, 1003 Lopezville Rd, Socorro, NM 87801 USA
[2] Univ Cape Town, Dept Astron, Private Bag X3, ZA-7701 Rondebosch, South Africa
[3] Univ Oxford, Dept Phys, Astrophys, Keble Rd, Oxford OX1 3RH, England
[4] Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands
关键词
catalogs; gamma rays: general; pulsars: general; radio continuum: general surveys; FLUX-DENSITY MEASUREMENTS; I. SURVEY DESCRIPTION; GAMMA-RAY SOURCES; MILLISECOND PULSAR; SPECTRA; 1ST; EMISSION; CATALOG; DISCOVERY; ARRAY;
D O I
10.3847/0004-637X/829/2/119
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have used the 150 MHz radio continuum survey (TGSS ADR) from the Giant Metrewave Radio Telescope (GMRT) to search for phase-averaged emission toward all well-localized radio pulsars north of -53 degrees decl. We detect emission toward 200 pulsars with high confidence (>= 5 sigma) and another 88 pulsars at fainter levels. We show that most of our identifications are likely from pulsars, except for a small number where the measured flux density is confused by an associated supernova or pulsar-wind nebula, or a globular cluster. We investigate the radio properties of the 150 MHz sample and. find an unusually high number of gamma-ray binary millisecond pulsars with very steep spectral indices. We also note a discrepancy in the measured flux densities between GMRT and LOFAR pulsar samples, suggesting that the flux density scale for the LOFAR pulsar sample may be in error by approximately a factor of. two. We carry out a separate search of 30 well-localized gamma-ray, radio-quiet pulsars in an effort to detect a widening of the radio beam into the line of sight at lower frequencies. No steep-spectrum emission was detected either toward individual pulsars or in a weighted stack of all 30 images.
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页数:9
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