2011ApJ...738...31T


Query : 2011ApJ...738...31T

2011ApJ...738...31T - Astrophys. J., 738, 31 (2011/September-1)

Anomalous X-ray pulsars and soft gamma-ray repeaters in the outer gap model: confronting Fermi observations.

TONG H., SONG L.M. and XU R.X.

Abstract (from CDS):

Anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs) are magnetar candidates, i.e., neutron stars powered by a strong magnetic field. If they are indeed magnetars, they will emit high-energy gamma rays that are detectable by the Fermi Large Area Telescope (LAT), according to the outer gap model. However, no significant detection is reported in recent Fermi-LAT observations of all known AXPs and SGRs. Considering the discrepancy between theory and observations, we calculate the theoretical spectra for all AXPs and SGRs with sufficient observational parameters. Our results show that most AXPs and SGRs are high-energy gamma-ray emitters if they are really magnetars. The four AXPs 1E 1547.0-5408, XTE J1810-197, 1E 1048.1-5937, and 4U 0142+61 should have been detected by Fermi-LAT. There is therefore a conflict between the outer gap model in the case of magnetars and Fermi observations. Possible explanations in the magnetar model are discussed. On the other hand, if AXPs and SGRs are fallback disk systems, i.e., accretion-powered for the persistent emissions, most of them are not high-energy gamma-ray emitters. Future deep Fermi-LAT observations of AXPs and SGRs will help us make clear whether they are magnetars or fallback disk systems.

Abstract Copyright:

Journal keyword(s): gamma rays: stars - pulsars: general - radiation mechanisms: non-thermal - stars: magnetars - stars: neutron

Simbad objects: 15

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Number of rows : 15
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9857 1
2 PSR J0146+6145 Psr 01 46 22.21 +61 45 03.8   28.100 25.620     ~ 523 0
3 NAME Sgr J0418+5729 gam 04 18 33.867 +57 32 22.91           ~ 195 0
4 2XMM J050106.5+451634 X 05 01 08.0 +45 16 31           ~ 112 0
5 2E 2336 HXB 10 50 08.93 -59 53 19.9           Be 386 0
6 PSR J1550-5418 Psr 15 50 54.18 -54 18 23.9           ~ 356 1
7 PSR J1622-4950 Psr 16 22 44.80 -49 50 54.4           ~ 114 0
8 PSR J1647-4552 Psr 16 47 10.18 -45 52 16.7           ~ 182 1
9 PSR J1708-4008 Psr 17 08 49.0 -40 09 10           ~ 270 0
10 [AAB2008] 1 X 17 14 05.758 -38 10 31.32           ~ 52 1
11 PSR J1808-2024 Psr 18 08 39.32 -20 24 40.1           ~ 1141 2
12 AX J1809.8-1943 Psr 18 09 51.07 -19 43 51.8           ~ 389 0
13 PSR J1841-0456 Psr 18 41 19.29 -04 56 11.4           ~ 242 1
14 GBS 1900+14 gB 19 07 13 +09 19.6           ~ 803 0
15 2E 4673 HXB 23 01 08.14 +58 52 44.5           ~ 599 1

    Equat.    Gal    SGal    Ecl

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2021.07.27-19:31:46

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