2010ApJ...709..241B

Query : 2010ApJ...709..241B

2010ApJ...709..241B - Astrophys. J., 709, 241-250 (2010/January-3)

A Chandra X-ray observatory study of PSR J1740-5340 and candidate millisecond pulsars in the globular cluster NGC 6397.

BOGDANOV S., VAN DEN BERG M., HEINKE C.O., COHN H.N., LUGGER P.M. and GRINDLAY J.E.

Abstract (from CDS):

We present a deep Chandra X-ray Observatory study of the peculiar binary radio millisecond pulsar (MSP) PSR J1740-5340 and candidate millisecond pulsars in the globular cluster NGC 6397. The X-rays from PSR J1740-5340 appear to be non-thermal and exhibit variability at the binary period. These properties suggest the presence of a relativistic intrabinary shock formed due to interaction of a relativistic rotation-powered pulsar wind and outflow from the unusual "red-straggler/sub-subgiant" companion. We find the X-ray source U18 to show similar X-ray and optical properties to those of PSR J1740-5340, making it a strong MSP candidate. It exhibits variability on timescales from hours to years, also consistent with an intrabinary shock origin of its X-ray emission. The unprecedented depth of the X-ray data allows us to conduct a complete census of MSPs in NGC 6397. Based on the properties of the present sample of X-ray-detected MSPs in the Galaxy, we find that NGC 6397 probably hosts no more than six MSPs.

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Journal keyword(s): globular clusters: general - globular clusters: individual: NGC 6397 - pulsars: general - pulsars: individual: PSR J1740-5340 - stars: neutron - X-rays: stars

VizieR on-line data: <Available at CDS (J/ApJ/709/241): table3.dat>

Nomenclature: Table 3: [GHE2001b] UNNN N=79 among (Nos U5-U123).

Simbad objects: 96

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Number of rows : 96
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 64 Sy2 00 17 30.3808604184 -06 49 28.599294972   13.56       ~ 27 0
2 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
3 PSR B0021-72W Psr 00 24 06.0580 -72 04 49.088           ~ 87 1
4 PSR J0030+0451 Psr 00 30 27.42348 +04 51 39.7144           ~ 596 1
5 PSR J0437-47 Psr 04 37 15.7994581776 -47 15 08.544351636           DC 1032 0
6 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
7 PSR J1023+0038 Psr 10 23 47.6841824712 +00 38 41.005893516     17.31     GV 470 0
8 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
9 [GHE2001b] U111 X 17 40 29.845 -53 40 26.99           ~ 3 0
10 [GHE2001b] U62 XB? 17 40 30.422 -53 39 17.47   23.33   20.90   ~ 3 0
11 [GHE2001b] U63 XB? 17 40 31.663 -53 38 46.36   20.39   18.15   ~ 3 0
12 [GHE2001b] U110 XB* 17 40 33.455 -53 39 16.83   22.04   19.92   ~ 3 0
13 [GHE2001b] U121 X 17 40 33.631 -53 39 34.96           ~ 3 0
14 [GHE2001b] U107 XB* 17 40 34.115 -53 40 17.01   21.63   19.61   ~ 3 0
15 [CGC95] 11 CV* 17 40 34.202 -53 41 15.28   23.93   23.32   ~ 5 0
16 [GHE2001b] U103 XB* 17 40 35.698 -53 40 12.56   21.05   19.26   ~ 3 0
17 [GHE2001b] U105 XB* 17 40 36.521 -53 41 07.85   21.84   19.78   ~ 3 0
18 [GHE2001b] U86 XB? 17 40 37.473 -53 41 47.24   24.06   21.16   ~ 3 0
19 [GHE2001b] U65 XB? 17 40 37.558 -53 39 17.85   21.27   18.72   ~ 3 0
20 [GHE2001b] U100 XB* 17 40 38.201 -53 40 46.55   23.14   20.81   ~ 3 0
21 [GHE2001b] U102 XB* 17 40 38.845 -53 39 43.12   23.80   21.27   ~ 3 0
22 CGKB A CV* 17 40 38.904 -53 39 51.09   24.73   22.72   ~ 9 0
23 [GHE2001b] U66 XB? 17 40 38.918 -53 38 49.80   24.56   21.93   ~ 3 0
24 Cl* NGC 6397 SAW V24 XB* 17 40 39.097 -53 40 23.09   17.07 16.45 18.40   ~ 6 0
25 [GHE2001b] U67 XB* 17 40 40.065 -53 40 16.59   21.17   19.34   ~ 4 0
26 [GHE2001b] U95 XB? 17 40 40.320 -53 40 44.58   23.02   20.81   ~ 3 0
27 Cl* NGC 6397 PCBY 4 BY* 17 40 40.543 -53 40 22.79   19.03   17.68   ~ 7 0
28 [GHE2001b] U68 X 17 40 40.730 -53 38 32.63           ~ 3 0
29 [GHE2001b] U69 XB* 17 40 40.867 -53 40 17.17   19.03   17.84   ~ 6 0
30 [GHE2001b] U98 XB* 17 40 40.994 -53 40 58.40   21.09   19.18   ~ 3 0
31 [CGC95] 13 CV? 17 40 41.237 -53 40 25.79   23.44   23.48   ~ 7 0
32 [GHE2001b] U119 X 17 40 41.261 -53 40 19.35           ~ 4 0
33 CGKB B LXB 17 40 41.468 -53 40 04.43           ~ 25 0
34 [GHE2001b] U118 X 17 40 41.576 -53 40 15.88   16.60   15.60   ~ 4 0
35 Cl* NGC 6397 SAW V12 CV* 17 40 41.597 -53 40 19.30   18.51 17.95 17.88   ~ 23 0
36 Cl* NGC 6397 LOAM 6 V* 17 40 41.6946306040 -53 40 33.309371811   16.28 15.82 15.50   ~ 10 0
37 [CGC95] 5 Em* 17 40 41.701 -53 40 29.00   21.50   20.15   ~ 13 0
38 Cl* NGC 6397 PCBY 6 XB* 17 40 41.779 -53 40 14.42   19.88   18.45   ~ 6 0
39 [CGC95] 4 Em* 17 40 41.830 -53 40 21.37   20.94   19.82   ~ 13 0
40 [GHE2001b] U20 BY* 17 40 41.98 -53 40 37.8           ~ 2 0
41 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
42 [GHE2001b] U117 XB* 17 40 42.153 -53 40 25.56   17.84   16.82   ~ 4 0
43 [GHE2001b] U116 XB* 17 40 42.236 -53 40 19.97   19.49   18.18   ~ 4 0
44 Cl* NGC 6397 SAW V34 CV* 17 40 42.306 -53 40 28.70   20.02   18.87   ~ 25 0
45 [GHE2001b] U93 X 17 40 42.393 -53 40 46.62           ~ 3 0
46 [GHE2001b] U91 * 17 40 42.430 -53 40 41.65   20.44   18.94   ~ 3 0
47 Cl* NGC 6397 SAW V31 El? 17 40 42.6230201282 -53 40 27.291274010   16.41 15.95 16.10   ~ 22 0
48 [GHE2001b] U16 X 17 40 42.636 -53 42 15.24           ~ 4 0
49 V* V1139 Ara CV* 17 40 42.651 -53 40 19.30   19.10   18.52   ~ 22 0
50 [GHE2001b] U73 XB* 17 40 42.681 -53 39 28.73   19.47   18.19   ~ 4 0
51 [GHE2001b] U113 X 17 40 42.764 -53 40 20.76           ~ 4 0
52 [GHE2001b] U94 XB* 17 40 42.868 -53 40 49.07   20.58   18.88   ~ 3 0
53 Cl* NGC 6397 PCBY 2 BY* 17 40 42.873 -53 40 34.12   18.53   17.25   ~ 5 0
54 Cl* NGC 6397 PCBY 3 XB* 17 40 42.877 -53 40 26.45   18.69   17.46   ~ 5 0
55 Cl* NGC 6397 SAW V26 XB* 17 40 43.059 -53 38 31.29   17.40 16.19 15.52   ~ 6 0
56 [GHE2001b] U104 X 17 40 43.124 -53 39 29.04           ~ 3 0
57 Cl* NGC 6397 SAW V35 XB* 17 40 43.328 -53 41 55.46   19.59 18.70 18.31   ~ 6 0
58 [GHE2001b] U114 X 17 40 43.469 -53 40 34.34       19.49   ~ 3 0
59 [GHE2001b] U89 XB* 17 40 43.613 -53 40 24.60   21.82   19.76   ~ 3 0
60 [GHE2001b] U75 XB* 17 40 43.666 -53 40 30.61   21.78   19.71   ~ 4 0
61 [GHE2001b] U106 X 17 40 43.737 -53 39 17.52           ~ 3 0
62 Cl* NGC 6397 SAW V17 XB* 17 40 43.818 -53 41 16.32   16.81 16.17 15.81   ~ 8 0
63 [GHE2001b] U97 X 17 40 43.918 -53 40 05.90   22.88   20.90   ~ 4 0
64 Cl* NGC 6397 SAW V7 EB* 17 40 43.9199366001 -53 40 35.292617809   17.74 17.09 16.72   ~ 16 0
65 [CGC95] 8 CV* 17 40 44.084 -53 40 39.17   24.33   24.00   ~ 14 0
66 Cl* NGC 6397 SAW V36 XB? 17 40 44.12 -53 42 11.5   17.11 16.52     ~ 7 0
67 Cl* NGC 6397 PCWD 1 EB* 17 40 44.58 -53 40 25.3   17.75 17.09 16.73   ~ 8 0
68 PSR J1740-5340 Psr 17 40 44.589 -53 40 40.90   17.43   16.25   ~ 157 2
69 [GHE2001b] U41 * 17 40 45.008 -53 39 55.21   17.69   16.74   ~ 4 0
70 [CGC95] 12 CV? 17 40 45.223 -53 40 28.60   23.19   22.08   ~ 6 0
71 [GHE2001b] U101 XB? 17 40 45.399 -53 41 01.40   19.94   18.48   ~ 3 0
72 [GHE2001b] U11 CV* 17 40 45.781 -53 40 41.52   24.26   23.65   ~ 11 0
73 [GHE2001b] U79 XB* 17 40 46.409 -53 40 04.05   21.98   19.82   ~ 3 0
74 [GHE2001b] U99 XB* 17 40 46.431 -53 40 30.40   19.96   18.49   ~ 3 0
75 [CGC95] 14 CV? 17 40 46.455 -53 41 56.50   25.84   25.40   ~ 5 0
76 Cl* NGC 6397 SAW V14 XB* 17 40 46.481 -53 41 15.44   20.21 19.19 18.62   ~ 7 0
77 [GHE2001b] U120 XB? 17 40 46.517 -53 40 15.64   23.70   21.09   ~ 3 0
78 [CGC95] 9 CV* 17 40 47.807 -53 41 28.40   23.63   23.38   ~ 13 0
79 [GHE2001b] U122 X 17 40 47.903 -53 39 24.83           ~ 3 0
80 Cl* NGC 6397 WFBY 2-1 XB* 17 40 48.537 -53 39 39.53   20.29   18.72   ~ 4 0
81 Cl* NGC 6397 SAW V13 EB* 17 40 48.978 -53 39 48.62   20.14 19.43 19.14   ~ 11 0
82 [CGC95] 15 CV? 17 40 49.615 -53 40 43.02   27.18   26.22   ~ 5 0
83 [GHE2001b] U123 X 17 40 49.621 -53 38 45.93           ~ 3 0
84 [GHE2001b] U112 * 17 40 50.374 -53 39 06.00   21.25   19.60   ~ 3 0
85 [GHE2001b] U108 X 17 40 52.099 -53 39 48.25           ~ 4 0
86 [GHE2001b] U109 XB? 17 40 52.728 -53 40 52.88   21.83   19.77   ~ 3 0
87 [CGC95] 10 CV* 17 40 52.807 -53 41 21.89   23.44   22.58   ~ 6 0
88 Cl* NGC 6397 SAW V30 EB* 17 40 54.531 -53 40 44.57   18.64 17.36     ~ 6 0
89 [GHE2001b] U84 XB? 17 40 54.807 -53 40 19.79   17.27       ~ 3 0
90 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 948 1
91 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 821 0
92 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
93 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
94 PSR J1959+2048 Psr 19 59 36.7643141520 +20 48 14.896407996   21.08 20.16 19.53 18.79 G: 854 3
95 V* LY Aqr Psr 20 51 07.52058 -08 27 37.6100           ~ 236 2
96 PSR J2124-3358 Psr 21 24 43.834930 -33 58 45.49195           ~ 337 1

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