2007ApJ...670..655K


Query : 2007ApJ...670..655K

2007ApJ...670..655K - Astrophys. J., 670, 655-667 (2007/November-3)

X-ray emission from PSR J1809-1917 and its pulsar wind nebula, possibly associated with the TeV gamma-ray source HESS J1809-193.

KARGALTSEV O. and PAVLOV G.G.

Abstract (from CDS):

We detected the 50 kyr old pulsar J1809-1917, and resolved its pulsar wind nebula (PWN) with the Chandra X-Ray Observatory. The pulsar spectrum fits a power-law+blackbody (PL+BB) model, with a photon index Γpsr=1.2±0.6 and T~2 MK for nH=0.7x1022/cm2. At a distance of 3.5 kpc, the luminosities of the PL and BB components are (4±1)x1031 ergs/s (in 0.5-8 keV) and ∼1x1032 ergs/s (bolometric), respectively. The bright inner PWN component of a 3"x12" size is elongated in the north-south direction (with the pulsar close to its south end) and immersed in a larger (20"x40"), similarly elongated outer PWN component. The PWN shape can be explained by the ram pressure confinement of the pulsar wind due to the supersonic motion of the pulsar. The PWN spectrum fits an absorbed PL model with nH~0.7x1022/cm2, Γpwn=1.4±0.1, and a 0.5-8 keV luminosity of ~4x1032 ergs/s. The compact PWN is surrounded by a large-scale (~4'x4') emission, more extended southward of the pulsar, i.e., in the direction of the alleged pulsar motion. To explain the extended X-ray emission ahead of the moving pulsar, one has to invoke strong intrinsic anisotropy of the pulsar wind, or assume that this emission comes from a relic PWN swept by the reverse SNR shock. The extension of the large-scale X-ray emission toward the center of the unidentified TeV source HESS J1809-193 suggests an association between this source and J1809-1917. An alternative source of relativistic electrons powering HESS J1809-193 might be the serendipitously discovered X-ray source CXOU J180940.7-192544. In addition to the cosmic microwave background radiation or starlight background, the seed photons for Compton up-scattering to TeV energies might be supplied by bright infrared emission from molecular/dust clouds seen within HESS J1809-193.

Abstract Copyright:

Journal keyword(s): ISM: individual (IRAS 18067-1927) - ISM: individual (IRAS 18067-1921) - ISM: individual (HESS J1809-193) - pulsars: individual (PSR J1809-1917) - X-rays: individual (CXOU J180940.7-192544) - X-rays: individual (CXOU 180933.3-192959 (read: CXOU J180933.3-192959))

Simbad objects: 30

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Number of rows : 30
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 PSR B0355+54 Psr 03 58 53.7165 +54 13 13.727           ~ 401 1
2 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           ~ 4908 1
3 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5766 4
4 NAME Geminga Psr 06 33 54.153 +17 46 12.91           ~ 1114 0
5 PSR B0656+14 Psr 06 59 48.1960 +14 14 19.400   24.85 24.90     ~ 785 1
6 NAME Vela X Psr 08 33 08.880 -45 11 24.36           ~ 253 1
7 NAME Vela XYZ Rad 08 34.0 -45 50           ~ 1145 2
8 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2120 1
9 PSR J1509-5850 Psr 15 09 27.153 -58 50 56.05           ~ 101 0
10 PSR J1740+1000 Psr 17 40 25.91 +10 00 06.0           ~ 58 0
11 NAME Mouse Rad 17 47 15.78 -29 58 01.0           ~ 94 1
12 PSR J1747-2958 Psr 17 47 15.869 -29 58 00.93           ~ 110 1
13 PSR B1757-24 Psr 18 01 00.016 -24 51 27.50           ~ 224 1
14 PSR B1800-21 Psr 18 03 51.45 -21 37 08.1           ~ 240 1
15 CXOU J180933.3-192959 X 18 09 33.3 -19 29 59           ~ 1 0
16 UCAC2 24414947 * 18 09 33.3486750893 -19 29 58.997213448   14.960 14.660 14.190   ~ 1 0
17 IRAS 18067-1921 IR 18 09 39.3 -19 21 19           ~ 10 0
18 MSX6C G010.9592+00.0217 Y*O 18 09 39.40 -19 26 27.0           ~ 20 1
19 CXOU J180940.7-192544 X 18 09 40.7 -19 25 44           ~ 1 0
20 PSR B1806-19.3 Psr 18 09 43.147 -19 17 38.10           ~ 77 1
21 GAL 010.96+00.01 HII 18 09 43.2 -19 26 27           ~ 7 0
22 SNR G011.1+00.1 SNR 18 09.8 -19 12           ~ 21 0
23 GRS G011.00 +00.00 HII 18 09.8 -19 25           ~ 2 0
24 AX J1809.8-1943 Psr 18 09 51.07 -19 43 51.8           ~ 390 0
25 SNR G011.0+00.0 SNR 18 10.1 -19 25           ~ 28 1
26 HESS J1809-193 gam 18 10 31 -19 18.0           ~ 44 1
27 SNR G011.2-00.3 SNR 18 11 28.9 -19 25 29           ~ 263 1
28 PSR J1811-1926 Psr 18 11 29.15 -19 25 25.4           ~ 114 1
29 PSR B1823-13 Psr 18 26 13.06 -13 34 48.1           ~ 372 1
30 MAGPIS SNR? G10.8750+0.0875 SR? ~ ~           ~ 3 0

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2021.08.05-15:40:23

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