2014MNRAS.441..757F

Query : 2014MNRAS.441..757F

2014MNRAS.441..757F - Mon. Not. R. Astron. Soc., 441, 757-768 (2014/June-2)

A Chandra look at the X-ray faint millisecond pulsars in the globular cluster NGC 6752.

FORESTELL L.M., HEINKE C.O., COHN H.N., LUGGER P.M., SIVAKOFF G.R., BOGDANOV S., COOL A.M. and ANDERSON J.

Abstract (from CDS):

We combine new and archival Chandra observations of the globular cluster NGC 6752 to create a deeper X-ray source list, and study the faint radio millisecond pulsars (MSPs) of this cluster. We detect four of the five MSPs in NGC 6752, and present evidence for emission from the fifth. The X-rays from these MSPs are consistent with thermal emission from the neutron star surfaces, with significantly higher fitted blackbody temperatures than other globular cluster MSPs (though we cannot rule out contamination by non-thermal emission or other X-ray sources). NGC 6752 E is one of the lowest-LX MSPs known, with LX(0.3-8 keV) = 1.0^+0.9_-0.5×10^30erg/s. We check for optical counterparts of the three isolated MSPs in the core using new Hubble Space Telescope Advanced Camera for Surveys images, finding no plausible counterparts, which is consistent with their lack of binary companions. We compile measurements of LX and spin-down power for radio MSPs from the literature, including errors where feasible. We find no evidence that isolated MSPs have lower LX than MSPs in binary systems, omitting binary MSPs showing emission from intrabinary wind shocks. We find weak evidence for an inverse correlation between the estimated temperature of the MSP X-rays and the known MSP spin period, consistent with the predicted shrinking of the MSP polar cap size with increasing spin period.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): stars: neutron - pulsars: general - globular clusters: individual: NGC 6752 - X-rays: binaries

Nomenclature: Table 1: [PLH2002] CXNN (Nos CX20 to CX40) added.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 84

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Number of rows : 84
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 PSR J0023+0923 Psr 00 23 16.890 +09 23 24.18           ~ 137 0
2 PSR J0024-7204C Psr 00 23 50.371 -72 04 31.44           ~ 65 1
3 PSR J0024-7204M Psr 00 23 54.489 -72 05 30.83           ~ 41 1
4 PSR J0023-7203J Psr 00 23 59.40735 -72 03 58.7914           ~ 91 1
5 PSR J0024-7204Y Psr 00 24 01.4016 -72 04 41.837           ~ 28 1
6 PSR J0024-72L Psr 00 24 03.754 -72 04 56.87           ~ 42 1
7 PSR J0024-72F Psr 00 24 03.907 -72 04 42.47           ~ 54 1
8 PSR J0023-72S Psr 00 24 03.9779 -72 04 42.342           ~ 37 1
9 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
10 PSR J0024-7204R Psr 00 24 05.670 -72 04 52.62           ~ 52 1
11 PSR B0021-72W Psr 00 24 06.0580 -72 04 49.088           ~ 87 1
12 PSR J0024-72H Psr 00 24 06.686 -72 04 06.74           ~ 64 1
13 PSR J0024-72G Psr 00 24 07.943 -72 04 39.65           ~ 47 1
14 PSR B0021-72T Psr 00 24 08.54 -72 04 38.9           ~ 48 1
15 PSR B0021-72N Psr 00 24 09.193 -72 04 28.83           ~ 40 1
16 PSR J0023-72U Psr 00 24 09.8325 -72 03 59.667           ~ 64 2
17 PSR J0024-7204E Psr 00 24 11.125 -72 05 20.14           ~ 66 1
18 PSR J0024-72D Psr 00 24 13.818 -72 04 43.83           ~ 62 1
19 PSR J0023-72Q Psr 00 24 16.482 -72 04 25.15           ~ 44 1
20 PSR J0030+0451 Psr 00 30 27.42348 +04 51 39.7144           ~ 596 1
21 PSR J0034-05 Psr 00 34 21.8281 -05 34 36.620           ~ 201 0
22 PSR J0218+42 Psr 02 18 06.3604 +42 32 17.365           ~ 365 2
23 PSR J0437-47 Psr 04 37 15.7994581776 -47 15 08.544351636           DC 1032 0
24 PSR J0751+1807 Psr 07 51 09.1539 +18 07 38.335           ~ 316 1
25 PSR J1012+5307 Psr 10 12 33.4345449600 +53 07 02.548542576     19.5     DA 419 1
26 PSR J1023+0038 Psr 10 23 47.6841824712 +00 38 41.005893516     17.31     GV 470 0
27 PSR J1025-07 Psr 10 24 38.6991893112 -07 19 19.045523388     19.81 18.78 18.00 ~ 286 1
28 PSR J1124-36 Psr 11 24 01.1169434 -36 53 19.108887           ~ 63 0
29 PSR B1257+12 Psr 13 00 03.1075 +12 40 55.155           ~ 546 1
30 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
31 PSR B1620-26 Psr 16 23 38.2218 -26 31 53.769     21.30     ~ 318 2
32 PSR J1723-2837 Psr 17 23 23.1937506912 -28 37 57.210408048   16.81 15.77 15.71   ~ 105 0
33 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
34 PSR J1740-5340 Psr 17 40 44.589 -53 40 40.90   17.43   16.25   ~ 157 2
35 PSR J1744-1134 Psr 17 44 29.4220844 -11 34 54.801320           ~ 323 1
36 PSR J1810+17 Psr 18 10 37.2791131488 +17 44 37.425884136           ~ 147 1
37 PSR J1824-2452A Psr 18 24 32.009 -24 52 11.10           ~ 529 2
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 J1824-2452B Psr 18 24 32.8 -24 52 11           ~ 9 0
42 PSR J1824-2452F Psr 18 24 32.8 -24 52 11           ~ 15 0
43 PSR J1824-2452J Psr 18 24 32.8 -24 52 11           ~ 16 0
44 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 821 0
45 PSR J1909-3744 Psr 19 09 47.42820 -37 44 14.7740           ~ 343 2
46 [G93] NGC 6752 A AGN 19 10 40.375 -59 58 41.47   21.76   20.97   ~ 11 0
47 [PLH2002] CX13 CV* 19 10 40.610 -60 00 05.91   24.60   24.32   ~ 9 0
48 [PLH2002] CX16 BY* 19 10 42.531 -59 58 43.03   19.39   18.33   ~ 5 0
49 [PLH2002] CX21 CV? 19 10 49.516 -59 59 43.16   19.06   18.53   ~ 5 0
50 [PLH2002] CX36 CV* 19 10 49.585 -59 58 26.41   24.93   24.85   ~ 5 0
51 Cl* NGC 6752 SAW V27 CV* 19 10 51.0764787837 -59 59 12.157923910           ~ 16 0
52 [PLH2002] CX5 CV* 19 10 51.414 -59 59 05.18   19.65   18.57   ~ 11 0
53 [JVH94] NGC 6752 22 CV* 19 10 51.505 -59 59 27.10   24.07   23.87   ~ 10 0
54 Cl* NGC 6752 BRS 2 CV* 19 10 51.511 -59 58 56.85           ~ 18 0
55 Cl* NGC 6752 SAW V25 CV* 19 10 51.586 -59 59 01.73   21.09   20.10   ~ 18 0
56 [PLH2002] CX9 CV? 19 10 51.766 -59 58 59.25   24.40   22.42   ~ 8 0
57 [PLH2002] CX25 CV? 19 10 51.957 -59 58 40.55   25.73   25.51   ~ 5 0
58 [PLH2002] CX18 X 19 10 52.006 -59 59 03.69           ~ 6 0
59 [PLH2002] CX14 X 19 10 52.039 -59 59 09.12           ~ 6 0
60 PSR J1910-5959B Psr 19 10 52.0556 -59 59 00.861           ~ 20 0
61 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
62 PSR J1910-5959E Psr 19 10 52.1572 -59 59 02.087           ~ 19 0
63 [PLH2002] CX35 CV? 19 10 52.165 -59 59 16.73   24.89   24.11   ~ 5 0
64 [PLH2002] CX11 CV* 19 10 52.376 -59 59 05.56           ~ 8 0
65 PSR J1910-5959D Psr 19 10 52.4163 -59 59 05.479           ~ 20 0
66 [PLH2002] CX23 CV? 19 10 52.546 -59 59 04.38   20.68   19.58   ~ 5 0
67 [PLH2002] CX24 CV? 19 10 52.670 -59 59 03.21   22.97   22.66   ~ 5 0
68 [PLH2002] CX12 X 19 10 52.694 -59 59 03.27           ~ 6 0
69 [PLH2002] CX32 CV? 19 10 54.137 -59 59 11.04   22.12   20.54   ~ 5 0
70 [PLH2002] CX10 AGN 19 10 54.754 -59 59 13.86   20.16   19.70   ~ 7 0
71 [PLH2002] CX19 ** 19 10 55.600 -59 59 17.33   18.35   17.58   ~ 8 0
72 [PLH2002] CX15 AGN 19 10 55.847 -59 57 45.78   23.05   22.66   ~ 7 0
73 [G93] NGC 6752 D CV* 19 10 56.005 -59 59 37.33           ~ 12 0
74 [PLH2002] CX8 CV? 19 11 02.944 -59 59 41.89           ~ 6 0
75 [PLH2002] CX17 G 19 11 05.258 -59 59 04.42           ~ 6 0
76 PSR B1907-60C Psr 19 11 05.5561 -60 00 59.680           ~ 33 0
77 PSR J1910-5959A Psr 19 11 42.7562 -59 58 26.900 22.02 22.13 22.03     DA5 99 1
78 PSR B1937+21.4 Psr 19 39 38.560096 +21 34 59.13552           ~ 1142 0
79 PSR J1953+1846A Psr 19 53 46.44 +18 47 04.7         19.96 ~ 32 0
80 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
81 PSR J1959+2048 Psr 19 59 36.7643141520 +20 48 14.896407996   21.08 20.16 19.53 18.79 G: 854 3
82 PSR J2124-3358 Psr 21 24 43.834930 -33 58 45.49195           ~ 337 1
83 PSR J2215+51 Psr 22 15 32.6869149432 +51 35 36.400854912           ~ 176 0
84 PSR J2256-1024 Psr 22 56 56.390 -10 24 34.37           ~ 88 0

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