2022ApJ...941...76V

Query : 2022ApJ...941...76V

2022ApJ...941...76V - Astrophys. J., 941, 76 (2022/December-2)

The Neutron Star Population in M28: A Joint Chandra/GBT Look at Pulsar Paradise.

VURGUN E., LINARES M., RANSOM S., PAPITTO A., BOGDANOV S., BOZZO E., REA N., GARCIA-SENZ D., FREIRE P. and STAIRS I.

Abstract (from CDS):

We present the results of a deep study of the neutron star (NS) population in the globular cluster M28 (NGC 6626), using the full 330 ks 2002-2015 ACIS data set from the Chandra X-ray Observatory and coordinated radio observations taken with the Green Bank Telescope (GBT) in 2015. We investigate the X-ray luminosity (LX), spectrum, and orbital modulation of the seven known compact binary millisecond pulsars in the cluster. We report two simultaneous detections of the redback PSR J1824-2452I (M28I) and its X-ray counterpart at LX = [8.3 ± 0.9] × 1031 erg s–1. We discover a double-peaked X-ray orbital flux modulation in M28I during its pulsar state, centered around pulsar inferior conjunction. We analyze the spectrum of the quiescent NS low-mass X-ray binary to constrain its mass and radius. Using both hydrogen and helium NS atmosphere models, we find an NS radius of R = 9.2-11.5 km and R = 13.0-17.5 km, respectively, for an NS mass of 1.4 M⊙ (68% confidence ranges). We also search for long-term variability in the 46 brightest X-ray sources and report the discovery of six new variable low-luminosity X-ray sources in M28.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Neutron stars - Millisecond pulsars - Low-mass x-ray binary stars

Simbad objects: 74

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Number of rows : 74
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 PSR J1023+0038 Psr 10 23 47.6841824712 +00 38 41.005893516     17.31     GV 470 0
3 PSR J1124-36 Psr 11 24 01.1169434 -36 53 19.108887           ~ 63 0
4 XSS J12270-4859 Psr 12 27 58.7476831464 -48 53 42.824592960           ~ 321 0
5 PSR J1306-4035 Psr 13 06 56.2808156568 -40 35 23.465480784   18.73   17.99 17.22 ~ 25 0
6 PSR J1311-3430 Psr 13 11 45.7292612136 -34 30 30.294149760   21.0   18.8   ~ 181 1
7 PSR J1446-4701 Psr 14 46 35.709721 -47 01 26.79678           ~ 82 1
8 PSR J1628-3205 Psr 16 28 07.0056152 -32 05 48.966980           ~ 66 0
9 PSR J1723-2837 Psr 17 23 23.1937506912 -28 37 57.210408048   16.81 15.77 15.71   ~ 105 0
10 PSR J1748-2446O Psr 17 48 04.682 -24 46 51.27           ~ 25 0
11 PSR J1748-2446ad Psr 17 48 04.9 -24 46 04           ~ 141 1
12 PSR J1748-2446P Psr 17 48 05.034 -24 46 41.29           ~ 26 0
13 [BSP2003] 1 X 18 24 20.531 -24 51 33.04           ~ 2 0
14 [BSP2003] 2 X 18 24 20.619 -24 51 27.17           ~ 3 0
15 [BSP2003] 3 X 18 24 22.57 -24 52 05.0           ~ 2 0
16 [BSP2003] 4 X 18 24 22.684 -24 51 02.65           ~ 4 0
17 [BSP2003] 5 X 18 24 22.831 -24 52 46.06           ~ 3 0
18 [BSP2003] 6 * 18 24 24.237 -24 51 04.14           ~ 3 0
19 VVV J182424.61-245301.67 EB* 18 24 24.6082497180 -24 53 01.688399643           ~ 5 0
20 [BSP2003] 8 * 18 24 25.175 -24 54 06.67           ~ 3 0
21 [BSP2003] 9 X 18 24 25.189 -24 52 13.60           ~ 2 0
22 [BSP2003] 10 X 18 24 25.658 -24 50 34.14           ~ 2 0
23 [BSP2003] 11 X 18 24 28.449 -24 50 33.59           ~ 2 0
24 [BSP2003] 12 X 18 24 28.580 -24 53 09.77           ~ 2 0
25 [BSP2003] 13 X 18 24 28.727 -24 51 24.56           ~ 2 0
26 [BSP2003] 14 X 18 24 30.155 -24 51 49.81           ~ 2 0
27 [BSP2003] 15 X 18 24 30.770 -24 52 33.19           ~ 2 0
28 [BSP2003] 17 X 18 24 31.063 -24 52 45.20           ~ 4 0
29 2MASS J18243107-2452137 X 18 24 31.07 -24 52 13.7           ~ 2 0
30 [BSP2003] 18 X 18 24 31.591 -24 52 17.49           ~ 2 0
31 PSR J1824-2452A Psr 18 24 32.009 -24 52 11.10           ~ 529 2
32 [BSP2003] 20 * 18 24 32.213 -24 53 51.58           ~ 3 0
33 [BSP2003] 21 X 18 24 32.272 -24 52 09.46           ~ 3 0
34 [BSP2003] 22 X 18 24 32.345 -24 52 08.02           ~ 3 0
35 IGR J18245-2452 LXB 18 24 32.50 -24 52 07.8           ~ 253 0
36 [BSP2003] 24 LXB 18 24 32.63 -24 52 21.7           ~ 5 0
37 [BSP2003] 25 X 18 24 32.689 -24 52 23.54           ~ 2 0
38 PSR J1824-2452H Psr 18 24 32.8 -24 52 11           ~ 29 0
39 PSR J1824-2452E Psr 18 24 32.8 -24 52 11           ~ 11 0
40 PSR J1824-2452C Psr 18 24 32.8 -24 52 11           ~ 23 1
41 PSR J1824-2452F Psr 18 24 32.8 -24 52 11           ~ 15 0
42 PSR J1824-2452J Psr 18 24 32.8 -24 52 11           ~ 16 0
43 PSR J1824-2452G Psr 18 24 32.8 -24 52 11           ~ 14 0
44 PSR J1824-2452D Psr 18 24 32.810 -24 52 11.20           ~ 8 0
45 PSR J1824-2452L Psr 18 24 32.810 -24 52 11.20           ~ 7 0
46 PSR J1824-2452K Psr 18 24 32.810 -24 52 11.20           ~ 5 0
47 [BSP2003] 26 LXB 18 24 32.821 -24 52 08.26           ~ 14 0
48 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 821 0
49 [BSP2003] 27 X 18 24 33.026 -24 52 01.72           ~ 2 0
50 [BSP2003] 28 X 18 24 33.026 -24 50 52.86           ~ 2 0
51 2CXO J182433.0-245210 X 18 24 33.070 -24 52 10.45           ~ 4 0
52 PSR J1824-2452M Psr 18 24 33.1835 -24 52 08.200           ~ 6 0
53 [BSP2003] 30 X 18 24 33.429 -24 52 15.49           ~ 2 0
54 [BSP2003] 31 X 18 24 33.539 -24 52 33.16           ~ 2 0
55 [BSP2003] 32 * 18 24 33.634 -24 52 12.12           ~ 3 0
56 [BSP2003] 33 X 18 24 33.759 -24 52 11.08           ~ 2 0
57 2MASS J18243396-2451130 * 18 24 33.9670348800 -24 51 13.047447672           ~ 2 0
58 [BSP2003] 35 X 18 24 34.469 -24 53 12.99           ~ 2 0
59 [BSP2003] 36 X 18 24 34.974 -24 54 57.88           ~ 2 0
60 [BSP2003] 37 X 18 24 35.524 -24 52 18.34           ~ 2 0
61 [BSP2003] 38 * 18 24 36.578 -24 50 16.04           ~ 3 0
62 [BSP2003] 39 * 18 24 37.326 -24 51 57.50           ~ 3 0
63 [BSP2003] 40 * 18 24 37.831 -24 51 44.58           ~ 3 0
64 [BSP2003] 41 X 18 24 37.897 -24 49 28.45           ~ 2 0
65 [BSP2003] 42 X 18 24 39.061 -24 51 08.26           ~ 2 0
66 [BSP2003] 43 * 18 24 39.567 -24 50 30.18           ~ 3 0
67 [BSP2003] 44 * 18 24 40.336 -24 50 35.31           ~ 3 0
68 [BSP2003] 45 X 18 24 41.303 -24 54 16.97           ~ 2 0
69 [BSP2003] 46 * 18 24 42.694 -24 52 47.48           ~ 3 0
70 PSR J1959+2048 Psr 19 59 36.7643141520 +20 48 14.896407996   21.08 20.16 19.53 18.79 G: 854 3
71 PSR J2039-5617 Psr 20 39 34.9609502672 -56 17 09.033104197           ~ 84 0
72 PSR J2129-04 Psr 21 29 45.0469239408 -04 29 06.973600236     16.68     ~ 100 0
73 PSR J2241-5236 Psr 22 41 42.03161 -52 36 36.2492           ~ 143 1
74 PSR J2256-1024 Psr 22 56 56.390 -10 24 34.37           ~ 88 0

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