2007ApJ...656..847Y


Query : 2007ApJ...656..847Y

2007ApJ...656..847Y - Astrophys. J., 656, 847-869 (2007/February-3)

The origin of diffuse X-ray and γ-ray emission from the Galactic Center region: cosmic-ray particles.

YUSEF-ZADEH F., MUNO M., WARDLE M. and LIS D.C.

Abstract (from CDS):

The inner couple of hundred parsecs of our Galaxy are characterized by a significant amount of synchrotron-emitting gas. Many of the best studied sources in this region exhibit a mixture of 6.4 keV Fe Kα emission, molecular line emission, and nonthermal radio continuum radiation. The spatial correlation between fluorescent Fe Kα line emission at 6.4 keV and molecular line emission from Galactic center molecular clouds has been explained as reflected X-rays from a past outburst of Sgr A*. Here we present a multiwavelength study of this region and find a correlation between the nonthermal radio filaments and the X-ray features. This correlation, when combined with the distribution of molecular gas, suggests against the irradiation model. Instead, we account for this distribution in terms of the impact of the relativistic particles from local (nonthermal filaments) and extended sources with diffuse neutral gas producing both nonthermal bremsstrahlung X-ray continuum emission and diffuse 6.4 keV line emission. The production rate of Fe Kα photons associated with the injection of electrons into a cloud as a function of column density is calculated. The required energy density of low-energy cosmic rays associated with the synchrotron-emitting radio filaments or extended features is estimated to be in the range between 20 and ∼103 eV/cm3 for Sgr C, Sgr B1, Sgr B2, and ``the 45 and -30 km/s'' clouds. We also generalize this idea to explain the cosmic-ray heating of molecular gas, the interstellar cosmic-ray ionization, the pervasive production of the diffuse Kα line, and TeV emission from the Galactic center molecular clouds. In particular, we suggest that inverse Compton scattering of the submillimeter radiation from dust by relativistic electrons may contribute substantially to the large-scale diffuse TeV emission observed toward the central regions of the Galaxy.

Abstract Copyright:

Journal keyword(s): ISM: Cosmic Rays - Galaxy: Center - ISM: H II Regions - ISM: General - X-Rays: ISM

Nomenclature: Fig. 1: [YMW2007] GLLL.ll+B.bb N=5.

Simbad objects: 25

goto Full paper

goto View the references in ADS

Number of rows : 25
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 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3892 2
2 QSO B1730-130 QSO 17 33 02.70578476 -13 04 49.5481484   18 18.5 18.78 17.39 ~ 1025 1
3 NAME Sgr C MoC 17 44 36.3 -29 28 13           ~ 325 0
4 GAL 359.5-00.15 Cld 17 45 -29.4           ~ 3 0
5 [LKL2000] 26 Rad 17 45 01 -29 28.6           ~ 3 0
6 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 925 0
7 SNR G359.1-00.5 Rad 17 45 30 -29 57.0           ~ 162 1
8 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12322 0
9 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3687 3
10 GCM -0.02 -0.07 MoC 17 45 50.4 -28 59 06           ~ 151 0
11 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 667 0
12 GCM +0.06 -0.04 MoC 17 45.9 -28 54           ~ 5 0
13 GCM +0.10 -0.01 MoC 17 45.9 -28 51           ~ 5 0
14 GCM +0.07 -0.08 MoC 17 46 06.2 -28 55 22           ~ 18 0
15 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 475 0
16 SNR G000.3+00.0 Rad 17 46 15 -28 38.0           ~ 33 1
17 GAL 000.11-00.11 MoC 17 46 18 -28 54.0           ~ 57 0
18 2E 3944 LXB 17 46 21.09 -28 43 42.3     12.50     ~ 106 0
19 GAL 000.6-00.0 Rad 17 47 -28.4           ~ 10 0
20 NAME Sgr B1 MoC 17 47 02.0 -28 31 57           ~ 137 0
21 NAME Sgr B MoC 17 47 02 -28 25.4           ~ 201 0
22 SNR G000.9+00.1 SNR 17 47.3 -28 09           ~ 175 1
23 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2023 1
24 SNR G001.0-00.1 SNR 17 48.5 -28 09           ~ 24 0
25 NAME Sgr D MoC 17 48 41.75 -28 01 45.0           ~ 125 1

To bookmark this query, right click on this link: simbad:objects in 2007ApJ...656..847Y and select 'bookmark this link' or equivalent in the popup menu


2021.08.06-05:28:05

© Université de Strasbourg/CNRS

    • Contact