2015MNRAS.453.3918M


Query : 2015MNRAS.453.3918M

2015MNRAS.453.3918M - Mon. Not. R. Astron. Soc., 453, 3918-3931 (2015/November-2)

Deep radio imaging of 47 Tuc identifies the peculiar X-ray source X9 as a new black hole candidate.

MILLER-JONES J.C.A., STRADER J., HEINKE C.O., MACCARONE T.J., VAN DEN BERG M., KNIGGE C., CHOMIUK L., NOYOLA E., RUSSELL T.D., SETH A.C. and SIVAKOFF G.R.

Abstract (from CDS):

We report the detection of steady radio emission from the known X-ray source X9 in the globular cluster 47 Tuc. With a double-peaked C iv emission line in its ultraviolet spectrum providing a clear signature of accretion, this source had been previously classified as a cataclysmic variable. In deep ATCA (Australia Telescope Compact Array) imaging from 2010 and 2013, we identified a steady radio source at both 5.5 and 9.0 GHz, with a radio spectral index (defined as Sν∝να) of α = -0.4±0.4. Our measured flux density of 42±4 µJy/beam at 5.5 GHz implies a radio luminosity (νLν) of 5.8x1027 erg/s, significantly higher than any previous radio detection of an accreting white dwarf. Transitional millisecond pulsars, which have the highest radio-to-X-ray flux ratios among accreting neutron stars (still a factor of a few below accreting black holes at the same LX), show distinctly different patterns of X-ray and radio variability than X9. When combined with archival X-ray measurements, our radio detection places 47 Tuc X9 very close to the radio/X-ray correlation for accreting black holes, and we explore the possibility that this source is instead a quiescent stellar-mass black hole X-ray binary. The nature of the donor star is uncertain; although the luminosity of the optical counterpart is consistent with a low-mass main-sequence donor star, the mass transfer rate required to produce the high quiescent X-ray luminosity of 1033 erg/s suggests the system may instead be ultracompact, with an orbital period of order 25 min. This is the fourth quiescent black hole candidate discovered to date in a Galactic globular cluster, and the only one with a confirmed accretion signature from its optical/ultraviolet spectrum.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): stars: black holes - globular clusters: individual: 47 Tuc - radio continuum: general - X-rays: binaries

Nomenclature: Table 2: [MSH2015] JHHMMSS.sss+DDMMSS.ss N=14.

Simbad objects: 56

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Number of rows : 56
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [MSH2015] J002328.608-720353.62 Rad 00 23 28.608 -72 03 53.62           ~ 1 0
2 [MA2000] 2 Psr 00 23 35.60 -72 01 25.9           ~ 3 0
3 [MA2000] 3 Rad 00 23 40.78 -72 05 11.7           ~ 3 0
4 [MSH2015] J002346.130-720715.21 Rad 00 23 46.130 -72 07 15.21           ~ 1 0
5 [MSH2015] J002352.358-720356.36 Rad 00 23 52.358 -72 03 56.36           ~ 1 0
6 PSR J0023-7203J Psr 00 23 59.40735 -72 03 58.7914           ~ 73 1
7 CXOGlb J002400.9-720453 LXB 00 24 00.968 -72 04 53.18     21.7     ~ 53 0
8 CXOGlb J002403.7-720423 CV* 00 24 03.776 -72 04 22.96           ~ 8 0
9 RX J0021.8-7221 CV* 00 24 04.263 -72 04 57.97 18.868   19.772   19.316 ~ 55 0
10 PSR J0023-72O Psr 00 24 04.637 -72 04 53.71           ~ 50 1
11 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3653 0
12 CXOGlb J002406.3-720443 CV* 00 24 06.397 -72 04 42.97           ~ 26 0
13 PSR J0024-72H Psr 00 24 06.686 -72 04 06.74           ~ 55 1
14 PSR J0024-72G Psr 00 24 07.943 -72 04 39.65           ~ 41 1
15 PSR B0021-72T Psr 00 24 08.54 -72 04 38.9           ~ 39 1
16 [GHE2001] W186 X 00 24 08.549 -72 07 08.13           ~ 2 0
17 [MA2000] 6 Rad 00 24 10.28 -72 07 41.1           ~ 2 0
18 [MA2000] 7 Rad 00 24 13.22 -72 03 32.4           ~ 3 0
19 PSR J0024-72D Psr 00 24 13.818 -72 04 43.83           ~ 54 1
20 PSR J0023-72Q Psr 00 24 16.482 -72 04 25.15           ~ 35 1
21 [GHE2001] W231 X 00 24 18.068 -72 06 18.92           ~ 2 0
22 [MSH2015] J002427.990-720603.82 Rad 00 24 27.990 -72 06 03.82           ~ 1 0
23 [GHE2001] W132 X 00 24 34.989 -72 05 01.72           ~ 2 0
24 [MSH2015] J002447.350-720753.63 Rad 00 24 47.350 -72 07 53.63           ~ 1 0
25 [MSH2015] J002455.057-720528.50 Rad 00 24 55.057 -72 05 28.50           ~ 1 0
26 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11380 1
27 V* TT Ari No* 02 06 53.0797667881 +15 17 41.849759579   10.73 10.20     Bep: 423 0
28 V* V1055 Ori LXB 06 17 07.3 +09 08 13   18.80 18.5     ~ 528 1
29 1A 0620-00 HXB 06 22 44.5420315454 -00 20 44.289428950 10.60 11.40 11.2     K3V-K7V 1055 0
30 V* BG CMi CV* 07 31 29.0080158733 +09 56 23.029183793   14.5       ~ 211 0
31 V* SU UMa CV* 08 12 28.2694633475 +62 36 22.428029272           B2 480 0
32 V* RW Sex No* 10 19 56.6224113828 -08 41 56.104268706   10.65 10.7 10.633 10.598 DAe 185 1
33 PSR J1023+0038 LXB 10 23 47.6840307966 +00 38 41.006983532     17.31     GV 332 0
34 V* AR UMa CV* 11 15 44.5894046553 +42 58 22.427873664     16.4     D+M 130 0
35 V* KV UMa HXB 11 18 10.7922353051 +48 02 12.319175505     12.25     K5V-M1V 740 0
36 XSS J12270-4859 LXB 12 27 58.7475950389 -48 53 42.826034125           ~ 218 0
37 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1993 2
38 CRTS J135716.8-093238 HXB 13 57 16.8357614768 -09 32 38.793867836           M4.5V 125 0
39 V* V834 Cen CV* 14 09 07.2853539143 -45 17 16.015131476   16.0       M6.5 303 0
40 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1724 0
41 MAXI J1659-152 LXB 16 59 01.680 -15 15 28.73           ~ 202 0
42 M 62 GlC 17 01 12.60 -30 06 44.5   8.55 7.39     ~ 540 0
43 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 328 1
44 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1844 1
45 V* DQ Her No* 18 07 30.2510755201 +45 51 32.564649735   14.605 14.443 14.800   M3+Ve 974 1
46 V* AM Her CV* 18 16 13.2546541781 +49 52 04.759861155     12.30     M4.5 922 0
47 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1262 0
48 V* V603 Aql No* 18 48 54.6369118792 +00 35 02.855110952 10.73 11.65 11.64     OB+e: 520 0
49 V* EM Cyg CV* 19 38 40.1105232999 +30 30 28.313972620     11.90     ~ 243 0
50 ICRF J193925.0-634245 Sy2 19 39 25.02671 -63 42 45.6255   18.87 18.37 17.64   ~ 1030 1
51 CD-42 14462 CV* 19 47 40.5289527355 -42 00 26.397656394 9.65 10.40 10.33     sdB 217 0
52 V* V404 Cyg HXB 20 24 03.820 +33 52 01.90 14.50 14.20 12.7     K0IV 1137 0
53 V* AE Aqr CV* 20 40 09.1598509019 -00 52 15.057042857   12.46 10.40   10.191 K3-5IV/V 627 0
54 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2969 0
55 V* SS Cyg CV* 21 42 42.8034554117 +43 35 09.863763484 11.07 8.2 7.70     K5V 1235 1
56 QSO B2353-686 QSO 23 56 00.6812809892 -68 20 03.471135697   17.61 17.00 16.97   ~ 79 1

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2021.08.03-23:11:16

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