2020MNRAS.493.6033Z

Query : 2020MNRAS.493.6033Z

2020MNRAS.493.6033Z - Mon. Not. R. Astron. Soc., 493, 6033-6049 (2020/April-3)

The MAVERIC survey: a hidden pulsar and a black hole candidate in ATCA radio imaging of the globular cluster NGC 6397.

ZHAO Y., HEINKE C.O., TUDOR V., BAHRAMIAN A., MILLER-JONES J.C.A., SIVAKOFF G.R., STRADER J., CHOMIUK L., SHISHKOVSKY L., MACCARONE T.J., PICHARDO MARCANO M. and GELFAND J.D.

Abstract (from CDS):

Using a 16.2-h radio observation by the Australia Telescope Compact Array and archival Chandra data, we found >5σ radio counterparts to four known and three new X-ray sources within the half-light radius (rh) of the Galactic globular cluster NGC 6397. The previously suggested millisecond pulsar (MSP) candidate, U18, is a steep-spectrum (Sν ∝ να; α=-2.0+0.4–0.5) radio source with a 5.5-GHz flux density of 54.7 ± 4.3 µJy. We argue that U18 is most likely a 'hidden' MSP that is continuously hidden by plasma shocked at the collision between the winds from the pulsar and companion star. The non-detection of radio pulsations so far is probably the result of enhanced scattering in this shocked wind. On the other hand, we observed the 5.5-GHz flux of the known MSP PSR J1740-5340 (U12) to decrease by a factor of >2.8 during epochs of 1.4-GHz eclipse, indicating that the radio flux is absorbed in its shocked wind. If U18 is indeed a pulsar whose pulsations are scattered, we note the contrast with U12's flux decreases in eclipse, which argues for two different eclipse mechanisms at the same radio frequency. In addition to U12 and U18, we also found radio associations for five other Chandra X-ray sources, four of which are likely background galaxies. The last, U97, which shows strong H α variability, is mysterious; it may be either a quiescent black hole low-mass X-ray binary or something more unusual.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

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

Nomenclature: Fig. 1, Table A1: [ZHT2020] WNNN (Nos W124-W146).

Simbad objects: 114

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Number of rows : 114
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 J0024-7204V Psr 00 24 05.359 -72 04 53.20           ~ 21 1
2 1A 0620-00 HXB 06 22 44.5423857312 -00 20 44.290460544           K3V-K7V 1144 0
3 V* KV UMa HXB 11 18 10.7930420496 +48 02 12.314730120           K5V-M1V 865 0
4 PSR J1311-3430 Psr 13 11 45.7292612136 -34 30 30.294149760   21.0   18.8   ~ 181 1
5 V* AR Sco EB* 16 21 47.2831986456 -22 53 10.385689092   14.94 14.75     M5+D? 141 0
6 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 857 0
7 [ZHT2020] W143 X 17 40 22.9940 -53 40 34.913           ~ 1 0
8 [ZHT2020] W141 X 17 40 26.6690 -53 41 18.152           ~ 1 0
9 [ZHT2020] W145 X 17 40 27.8890 -53 38 45.537           ~ 1 0
10 [ZHT2020] W125 X 17 40 27.9760 -53 42 00.059           ~ 1 0
11 [ZHT2020] W139 X 17 40 29.2960 -53 42 21.018           ~ 1 0
12 [GHE2001b] U111 X 17 40 29.845 -53 40 26.99           ~ 3 0
13 [GHE2001b] U62 XB? 17 40 30.422 -53 39 17.47   23.33   20.90   ~ 3 0
14 [ZHT2020] W124 X 17 40 30.5110 -53 42 34.201           ~ 1 0
15 [GHE2001b] U63 XB? 17 40 31.663 -53 38 46.36   20.39   18.15   ~ 3 0
16 [GHE2001b] U110 XB* 17 40 33.455 -53 39 16.83   22.04   19.92   ~ 3 0
17 [GHE2001b] U121 X 17 40 33.631 -53 39 34.96           ~ 3 0
18 [ZHT2020] W144 X 17 40 33.9920 -53 39 07.244           ~ 1 0
19 [GHE2001b] U107 XB* 17 40 34.115 -53 40 17.01   21.63   19.61   ~ 3 0
20 [CGC95] 11 CV* 17 40 34.202 -53 41 15.28   23.93   23.32   ~ 5 0
21 [GHE2001b] U103 XB* 17 40 35.698 -53 40 12.56   21.05   19.26   ~ 3 0
22 [ZHT2020] W132 X 17 40 36.5030 -53 42 41.158           ~ 1 0
23 [GHE2001b] U105 XB* 17 40 36.521 -53 41 07.85   21.84   19.78   ~ 3 0
24 [GHE2001b] U86 XB? 17 40 37.473 -53 41 47.24   24.06   21.16   ~ 3 0
25 [GHE2001b] U65 XB? 17 40 37.558 -53 39 17.85   21.27   18.72   ~ 3 0
26 [ZHT2020] W131 X 17 40 37.6900 -53 42 46.340           ~ 1 0
27 [GHE2001b] U100 XB* 17 40 38.201 -53 40 46.55   23.14   20.81   ~ 3 0
28 [GHE2001b] U102 XB* 17 40 38.845 -53 39 43.12   23.80   21.27   ~ 3 0
29 CGKB A CV* 17 40 38.904 -53 39 51.09   24.73   22.72   ~ 9 0
30 [GHE2001b] U66 XB? 17 40 38.918 -53 38 49.80   24.56   21.93   ~ 3 0
31 Cl* NGC 6397 SAW V24 XB* 17 40 39.097 -53 40 23.09   17.07 16.45 18.40   ~ 6 0
32 [GHE2001b] U67 XB* 17 40 40.065 -53 40 16.59   21.17   19.34   ~ 4 0
33 [GHE2001b] U95 XB? 17 40 40.320 -53 40 44.58   23.02   20.81   ~ 3 0
34 Cl* NGC 6397 PCBY 4 BY* 17 40 40.543 -53 40 22.79   19.03   17.68   ~ 7 0
35 [GHE2001b] U68 X 17 40 40.730 -53 38 32.63           ~ 3 0
36 [GHE2001b] U69 XB* 17 40 40.867 -53 40 17.17   19.03   17.84   ~ 6 0
37 [GHE2001b] U98 XB* 17 40 40.994 -53 40 58.40   21.09   19.18   ~ 3 0
38 [CGC95] 13 CV? 17 40 41.237 -53 40 25.79   23.44   23.48   ~ 7 0
39 [GHE2001b] U119 X 17 40 41.261 -53 40 19.35           ~ 4 0
40 CGKB B LXB 17 40 41.468 -53 40 04.43           ~ 25 0
41 [GHE2001b] U118 X 17 40 41.576 -53 40 15.88   16.60   15.60   ~ 4 0
42 Cl* NGC 6397 SAW V12 CV* 17 40 41.597 -53 40 19.30   18.51 17.95 17.88   ~ 23 0
43 Cl* NGC 6397 LOAM 6 V* 17 40 41.6946306040 -53 40 33.309371811   16.28 15.82 15.50   ~ 10 0
44 [CGC95] 5 Em* 17 40 41.701 -53 40 29.00   21.50   20.15   ~ 13 0
45 Cl* NGC 6397 PCBY 6 XB* 17 40 41.779 -53 40 14.42   19.88   18.45   ~ 6 0
46 [CGC95] 4 Em* 17 40 41.830 -53 40 21.37   20.94   19.82   ~ 13 0
47 [ZHT2020] W134 X 17 40 42.0360 -53 40 37.877           ~ 1 0
48 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
49 [GHE2001b] U117 XB* 17 40 42.153 -53 40 25.56   17.84   16.82   ~ 4 0
50 [GHE2001b] U116 XB* 17 40 42.236 -53 40 19.97   19.49   18.18   ~ 4 0
51 Cl* NGC 6397 SAW V34 CV* 17 40 42.306 -53 40 28.70   20.02   18.87   ~ 25 0
52 [GHE2001b] U93 X 17 40 42.393 -53 40 46.62           ~ 3 0
53 [GHE2001b] U91 * 17 40 42.430 -53 40 41.65   20.44   18.94   ~ 3 0
54 Cl* NGC 6397 SAW V31 El? 17 40 42.6230201282 -53 40 27.291274010   16.41 15.95 16.10   ~ 22 0
55 [GHE2001b] U16 X 17 40 42.636 -53 42 15.24           ~ 4 0
56 V* V1139 Ara CV* 17 40 42.651 -53 40 19.30   19.10   18.52   ~ 22 0
57 [GHE2001b] U73 XB* 17 40 42.681 -53 39 28.73   19.47   18.19   ~ 4 0
58 [GHE2001b] U113 X 17 40 42.764 -53 40 20.76           ~ 4 0
59 [GHE2001b] U94 XB* 17 40 42.868 -53 40 49.07   20.58   18.88   ~ 3 0
60 Cl* NGC 6397 PCBY 2 BY* 17 40 42.873 -53 40 34.12   18.53   17.25   ~ 5 0
61 Cl* NGC 6397 PCBY 3 XB* 17 40 42.877 -53 40 26.45   18.69   17.46   ~ 5 0
62 Cl* NGC 6397 SAW V26 XB* 17 40 43.059 -53 38 31.29   17.40 16.19 15.52   ~ 6 0
63 [GHE2001b] U104 X 17 40 43.124 -53 39 29.04           ~ 3 0
64 Cl* NGC 6397 SAW V35 XB* 17 40 43.328 -53 41 55.46   19.59 18.70 18.31   ~ 6 0
65 [GHE2001b] U114 X 17 40 43.469 -53 40 34.34       19.49   ~ 3 0
66 [GHE2001b] U89 XB* 17 40 43.613 -53 40 24.60   21.82   19.76   ~ 3 0
67 [GHE2001b] U75 XB* 17 40 43.666 -53 40 30.61   21.78   19.71   ~ 4 0
68 [GHE2001b] U106 X 17 40 43.737 -53 39 17.52           ~ 3 0
69 Cl* NGC 6397 SAW V17 XB* 17 40 43.818 -53 41 16.32   16.81 16.17 15.81   ~ 8 0
70 [GHE2001b] U97 X 17 40 43.918 -53 40 05.90   22.88   20.90   ~ 4 0
71 Cl* NGC 6397 SAW V7 EB* 17 40 43.9199366001 -53 40 35.292617809   17.74 17.09 16.72   ~ 16 0
72 [CGC95] 8 CV* 17 40 44.084 -53 40 39.17   24.33   24.00   ~ 14 0
73 Cl* NGC 6397 SAW V36 XB? 17 40 44.12 -53 42 11.5   17.11 16.52     ~ 7 0
74 Cl* NGC 6397 PCWD 1 EB* 17 40 44.58 -53 40 25.3   17.75 17.09 16.73   ~ 8 0
75 PSR J1740-5340 Psr 17 40 44.589 -53 40 40.90   17.43   16.25   ~ 157 2
76 [GHE2001b] U41 * 17 40 45.008 -53 39 55.21   17.69   16.74   ~ 4 0
77 [CGC95] 12 CV? 17 40 45.223 -53 40 28.60   23.19   22.08   ~ 6 0
78 [GHE2001b] U101 XB? 17 40 45.399 -53 41 01.40   19.94   18.48   ~ 3 0
79 [GHE2001b] U11 CV* 17 40 45.781 -53 40 41.52   24.26   23.65   ~ 11 0
80 [GHE2001b] U79 XB* 17 40 46.409 -53 40 04.05   21.98   19.82   ~ 3 0
81 [GHE2001b] U99 XB* 17 40 46.431 -53 40 30.40   19.96   18.49   ~ 3 0
82 [CGC95] 14 CV? 17 40 46.455 -53 41 56.50   25.84   25.40   ~ 5 0
83 Cl* NGC 6397 SAW V14 XB* 17 40 46.481 -53 41 15.44   20.21 19.19 18.62   ~ 7 0
84 [GHE2001b] U120 XB? 17 40 46.517 -53 40 15.64   23.70   21.09   ~ 3 0
85 [CGC95] 9 CV* 17 40 47.807 -53 41 28.40   23.63   23.38   ~ 13 0
86 [GHE2001b] U122 X 17 40 47.903 -53 39 24.83           ~ 3 0
87 Cl* NGC 6397 WFBY 2-1 XB* 17 40 48.537 -53 39 39.53   20.29   18.72   ~ 4 0
88 [ZHT2020] W135 X 17 40 48.7540 -53 43 04.444           ~ 2 0
89 Cl* NGC 6397 SAW V13 EB* 17 40 48.978 -53 39 48.62   20.14 19.43 19.14   ~ 11 0
90 [CGC95] 15 CV? 17 40 49.615 -53 40 43.02   27.18   26.22   ~ 5 0
91 [GHE2001b] U123 X 17 40 49.621 -53 38 45.93           ~ 3 0
92 [GHE2001b] U112 * 17 40 50.374 -53 39 06.00   21.25   19.60   ~ 3 0
93 [ZHT2020] W130 X 17 40 50.5970 -53 38 25.760           ~ 1 0
94 [ZHT2020] W138 X 17 40 50.7100 -53 43 02.721           ~ 1 0
95 [GHE2001b] U108 X 17 40 52.099 -53 39 48.25           ~ 4 0
96 [GHE2001b] U109 XB? 17 40 52.728 -53 40 52.88   21.83   19.77   ~ 3 0
97 [CGC95] 10 CV* 17 40 52.807 -53 41 21.89   23.44   22.58   ~ 6 0
98 [HKD2016] 3556 * 17 40 53.1715063725 -53 40 58.360258557           ~ 2 0
99 [ZHT2020] W140 X 17 40 53.8680 -53 41 30.826           ~ 1 0
100 Cl* NGC 6397 SAW V30 EB* 17 40 54.531 -53 40 44.57   18.64 17.36     ~ 6 0
101 [GHE2001b] U84 XB? 17 40 54.807 -53 40 19.79   17.27       ~ 3 0
102 [ZHT2020] W129 X 17 40 56.2040 -53 39 11.229           ~ 2 0
103 [ZHT2020] W128 X 17 40 56.7360 -53 39 39.863           ~ 1 0
104 [ZHT2020] W146 X 17 40 57.3860 -53 38 40.507           ~ 1 0
105 [ZHT2020] W133 X 17 40 58.3370 -53 41 53.413           ~ 1 0
106 [ZHT2020] W137 X 17 40 58.5480 -53 39 17.142           ~ 1 0
107 [ZHT2020] W127 X 17 40 58.5590 -53 40 14.878           ~ 2 0
108 [ZHT2020] W126 X 17 40 59.6720 -53 40 39.095           ~ 1 0
109 [ZHT2020] W142 X 17 41 00.8960 -53 40 52.215           ~ 1 0
110 V* BY Dra BY* 18 33 55.7720712062 +51 43 08.897780286 10.22 9.23   8.733   K4Ve+K7.5Ve 639 0
111 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2
112 PSR J1959+2048 Psr 19 59 36.7643141520 +20 48 14.896407996   21.08 20.16 19.53 18.79 G: 854 3
113 V* AE Aqr CV* 20 40 09.1598959176 -00 52 15.055595220   12.46 10.40   10.191 K3-5IV/V 705 0
114 V* SS Cyg CV* 21 42 42.8034497592 +43 35 09.867842484 11.07 12.651 12.032 9.326   K5V 1324 1

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