2017MNRAS.468.1486D


Query : 2017MNRAS.468.1486D

2017MNRAS.468.1486D - Mon. Not. R. Astron. Soc., 468, 1486-1492 (2017/June-3)

A transient, flat spectrum radio pulsar near the Galactic Centre.

DEXTER J., DEGENAAR N., KERR M., DELLER A., DENEVA J., LAZARUS P., KRAMER M., CHAMPION D. and KARUPPUSAMY R.

Abstract (from CDS):

Recent studies have shown possible connections between highly magnetized neutron stars ('magnetars'), whose X-ray emission is too bright to be powered by rotational energy, and ordinary radio pulsars. In addition to the magnetar SGR J1745-2900, one of the radio pulsars in the Galactic Centre (GC) region, PSR J1746-2850, had timing properties implying a large magnetic field strength and young age, as well as a flat spectrum. All characteristics are similar to those of rare, transient, radio-loud magnetars. Using several deep non-detections from the literature and two new detections, we show that this pulsar is also transient in the radio. Both the flat spectrum and large amplitude variability are inconsistent with the light curves and spectral indices of three radio pulsars with high magnetic field strengths. We further use frequent, deep archival imaging observations of the GC in the past 15 yr to rule out a possible X-ray outburst with a luminosity exceeding the rotational spin-down rate. This source, either a transient magnetar without any detected X-ray counterpart or a young, strongly magnetized radio pulsar producing magnetar-like radio emission, further blurs the line between the two categories. We discuss the implications of this object for the radio emission mechanism in magnetars and for star and compact object formation in the GC.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: magnetars - pulsars: individual: PSR J1746-2850 - Galaxy: centre - Galaxy: centre

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 PSR J1550-5418 Psr 15 50 54.18 -54 18 23.9           ~ 410 1
2 PSR J1622-4950 Psr 16 22 44.80 -49 50 54.4           ~ 146 0
3 PSR J1718-3718 Psr 17 18 10.16 -37 18 53.8           ~ 72 0
4 PSR B1731-33.5 Psr 17 34 26.6 -33 33 22           ~ 100 1
5 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14443 0
6 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4397 3
7 PSR J1745-2900 Psr 17 45 40.1640 -29 00 29.818           ~ 315 0
8 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 738 0
9 PSR J1746-2850 Psr 17 46 06.6 -28 50 42           ~ 14 0
10 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 526 0
11 AX J1809.8-1943 Psr 18 09 51.07 -19 43 51.8           ~ 465 0
12 PSR B1811-17.7 Psr 18 14 43.10 -17 44 48.0           ~ 75 0
13 PSR J1832+0029 Psr 18 32 50.7 +00 29 27           ~ 55 0
14 PSR J1841-0500 Psr 18 41 18.14 -05 00 19.5           ~ 47 0

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