2025ApJ...981..173A

Query : 2025ApJ...981..173A

2025ApJ...981..173A - Astrophys. J., 981, 173 (2025/March-2)

Anticorrelation Between Flux and Photon Index of Hard-X-Ray Emission from the Crab.

AUGUSTINE K.A. and CHANG H.-K.

Abstract (from CDS):

Using Swift Burst Alert Telescope event-mode data during gamma-ray burst occurrences, we conduct spectral analysis for the Crab system. From 38 good observations, which span a period of 18 yr from 2006 to 2023, we find that the Crab's X-ray flux not only flickers but also significantly anticorrelates to its spectral power-law photon index. Since the emission contribution of the Crab pulsar in this energy range is small, this anticorrelation is mainly about the emission of the Crab nebula. We suggest that this anticorrelation provides observational supporting evidence for the long-standing notion that the nebula emission is due to synchrotron radiation of shocked pulsar winds in the nebula.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Millisecond pulsars - Pulsar wind nebulae - Pulsars

Simbad objects: 27

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Number of rows : 27
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 GRB 060210 gB 03 50 57.370 +27 01 34.40   20.27       ~ 275 0
2 GRB 070714B G 03 51 22.2720 +28 17 50.943           ~ 248 0
3 GRB 060211A gB 03 53 32.600 +21 29 19.20           ~ 53 0
4 GRB 080822B gB 04 14 14.5 +25 45 36           ~ 18 0
5 GRB 220930A gB 04 18 52.11 +13 20 56.8           ~ 16 0
6 GRB 210308A gB 04 28 17.83 +37 26 02.1           ~ 12 0
7 GRB 131227A gB 04 29 30.78 +28 52 59.2           ~ 35 0
8 GRB 150911A gB 04 29 44.15 +05 44 07.6           ~ 29 0
9 Fermi bn130216927 gB 04 31 36.0 +14 39 53           ~ 36 0
10 GRB 060211B gB 05 00 17.110 +14 56 57.30           ~ 41 0
11 Fermi bn160104475 gB 05 07 11.04 +11 19 26.6           ~ 30 0
12 GRB 211221A gB 05 15 35.39 +00 54 52.4           ~ 20 0
13 GRB 210919A gB 05 21 01.05 +01 18 42.1           ~ 41 0
14 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
15 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
16 GRB 080409 gB 05 37 19.20 +05 05 05.1           ~ 38 0
17 GRB 141015A gB 05 50 04.43 +18 19 47.6           ~ 26 0
18 GRB 200907B G 05 56 06.9510 +06 54 22.637           ~ 24 0
19 GRB 151215A gB 06 14 20.20 +35 30 58.3           ~ 47 0
20 GRB 220430A gB 06 30 26.90 +09 32 51.1           ~ 19 0
21 GRB 110414A gB 06 31 29.43 +24 21 44.7           ~ 40 0
22 Fermi bn150203173 gB 06 33 35.80 +06 57 13.5           ~ 31 0
23 GRB 160321A gB 06 37 40.77 +05 44 52.0           ~ 17 0
24 GRB 080319D gB 06 37 53.47 +23 56 33.7           ~ 35 0
25 GRB 140430A gB 06 51 44.58 +23 01 25.5           ~ 81 0
26 GRB 161007A gB 06 53 38.17 +23 18 24.2           ~ 21 0
27 Fermi bn110412315 gB 08 53 58 +13 29.3           ~ 25 0

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