2020ApJ...904L..29Z

Query : 2020ApJ...904L..29Z

2020ApJ...904L..29Z - Astrophys. J., 904, L29-L29 (2020/December-1)

A gamma-ray periodic modulation in globular cluster 47 Tucanae.

ZHANG P.-F., ZHOU J.-N., YAN D.-H., YAN J.-Z., FAN Y.-Z., FANG J. and ZHANG L.

Abstract (from CDS):

The globular cluster 47 Tucanae was first detected in gamma rays by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope, and the gamma-ray emission has been widely attributed to the millisecond pulsars. In this work, we analyze the Fermi-LAT pass 8 data ranging from 2008 August to 2017 May and report the detection of a modulation with a period of 18.416 ± 0.008 hr at a significance level of ∼4.8σ. This is the first time detecting a significant modulation with a period much longer than that of millisecond pulsars in gamma rays from globular clusters. The periodic modulation signal appears in the Swift Burst Alert Telescope (BAT) data as well. The phase-folded Chandra X-ray light curve of a point source may have provided an additional clue.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Globular star clusters - Gamma-rays - Binary pulsars - Periodic orbit

Simbad objects: 14

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Number of rows : 14
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 RX J0021.8-7221 LXB 00 24 04.263 -72 04 57.97 18.868   19.772   19.316 ~ 78 0
2 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
3 Cl* NGC 104 SBG V3 CV* 00 24 06.2943986812 -72 04 45.361338815   13.429 10.622   9.316 ~ 34 0
4 LS I +61 303 HXB 02 40 31.6644419688 +61 13 45.593918580 11.27 11.61 10.75 10.19 9.55 B0Ve 903 2
5 4FGL J0535.2-6736 HXB 05 36 00.01 -67 35 07.5           ~ 49 0
6 1FGL J1018.6-5856 HXB 10 18 55.5875706288 -58 56 45.975246900   13.638 12.683     O6V((f)) 156 0
7 PSR J1311-3430 Psr 13 11 45.7292612136 -34 30 30.294149760   21.0   18.8   ~ 181 1
8 PSR J1820-30A Psr 18 23 40.4842 -30 21 39.920           ~ 168 1
9 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 939 1
10 PSR J1824-2452A Psr 18 24 32.009 -24 52 11.10           ~ 529 2
11 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 821 0
12 V* V479 Sct HXB 18 26 15.0561548880 -14 50 54.247274304 12.02 12.23 11.27 11.04   ON6V((f))z 613 2
13 PSR J1959+2048 Psr 19 59 36.7643141520 +20 48 14.896407996   21.08 20.16 19.53 18.79 G: 854 3
14 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 2035 2

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