scholarly journals Large-scale extraplanar PAH emission in the Galactic center region found by AKARI mid-infrared all-sky survey

2014 ◽  
Author(s):  
Toru Kondo ◽  
Hidehiro Kaneda ◽  
Daisuke Ishihara ◽  
Shinki Oyabu ◽  
Mitsuyoshi Yamagishi ◽  
...  
Keyword(s):  
Large Scale ◽  
Galactic Center ◽  
Mid Infrared ◽  
Center Region ◽  
Sky Survey

scholarly journals A large scale CO survey of the Galactic center region

1997 ◽  
Vol 125 (1) ◽  
pp. 99-138 ◽  
Author(s):  
M. Bitran ◽  
H. Alvarez ◽  
L. Bronfman ◽  
J. May ◽  
P. Thaddeus
Keyword(s):  
Large Scale ◽  
Galactic Center ◽  
Center Region

scholarly journals Molecular Clouds in the Central 100-pc of the Galactic Center

1989 ◽  
Vol 136 ◽  
pp. 135-140 ◽  
Author(s):  
M. Tsuboi ◽  
T. Handa ◽  
M. Inoue ◽  
J. Inatani ◽  
N. Ukita
Keyword(s):  
Molecular Clouds ◽  
Large Scale ◽  
Galactic Center ◽  
Galactic Latitude ◽  
Center Region ◽  
Elliptical Shape ◽  
Latitude Region ◽  
Galactic Longitude

We have observed CS (J=1–0/2–1) lines in a 60′×30′(1×b) area of the Galactic center region. There are two large-scale features with elliptical shape in the position–velocity maps, which suggest shell–like structures in the region. One is the ring with a radius of ~40 pc in the positive galactic latitude region and another is the shell with a radius of ~20 pc in the negative galactic longitude region. These could be due to suggest star bursts occurred in the Galactic center region.

scholarly journals A STUDY OF THE GALACTIC CENTER REGIONS USING THE IMPROVED DATA OF THE MID-INFRARED ALL-SKY SURVEY

2012 ◽  
Vol 27 (4) ◽  
pp. 217-218
Author(s):  
A. Mouri ◽  
H. Kaneda ◽  
D. Ishihara ◽  
S. Oyabu ◽  
T. Kondo ◽  
...  
Keyword(s):  
Galactic Center ◽  
Mid Infrared ◽  
Sky Survey

scholarly journals A Large-Scale CO Imaging of the Galactic Center

1998 ◽  
Vol 179 ◽  
pp. 189-190
Author(s):  
T. Oka ◽  
T. Hasegawa ◽  
F. Sato ◽  
H. Yamasaki ◽  
M. Tsuboi ◽  
...  
Keyword(s):  
Star Formation ◽  
Large Scale ◽  
Galactic Center ◽  
Galactic Disk ◽  
Molecular Gas ◽  
Physical Conditions ◽  
Relative Paucity ◽  
Center Region ◽  
Star Formation Activity

Molecular gas in the Galactic center region is spatially and kinematically complex, and its physical conditions are distinctively different from those of molecular gas in the Galactic disk (e.g., Morris 1996). Relative paucity of current star formation activity, despite the abundance of dense molecular gas in this region, is one of the problem at issue.

scholarly journals Mass Spectrum of the Galactic Center Molecular Clouds

2001 ◽  
Vol 205 ◽  
pp. 356-357
Author(s):  
Atsushi Miyazaki ◽  
Masato Tsuboi
Keyword(s):  
Mass Spectrum ◽  
Molecular Clouds ◽  
Large Scale ◽  
Galactic Center ◽  
Molecular Line ◽  
Center Region ◽  
Cloud Cores

We have observed three molecular clumps in the Galactic center region in the CS J=2-1 line with the Nobeyama Millimeter Array. We have determined the mass spectrum and other statistical relations for the Galactic center cloud cores. The derived mass spectrum is somewhat steeper than for galactic cloud cores based on molecular line observations. In addition, the spectrum is steeper than that of the large scale Galactic center clumps.

scholarly journals A novel analytical model of the magnetic field configuration in the Galactic center

2020 ◽  
Vol 644 ◽  
pp. A71
Author(s):  
M. Guenduez ◽  
J. Becker Tjus ◽  
K. Ferrière ◽  
R.-J. Dettmar
Keyword(s):  
Magnetic Field ◽  
Large Scale ◽  
Field Model ◽  
Galactic Center ◽  
Cosmic Ray ◽  
Field Structure ◽  
Magnetic Field Structure ◽  
Center Region ◽  
Magnetic Field Model ◽  
The Magnetic Field

Context. Cosmic-ray propagation is strongly dependent on the large-scale configuration of the Galactic magnetic field. In particular, the Galactic center region provides highly interesting cosmic-ray data from gamma-ray maps and it is clear that a large fraction of the cosmic rays detected at Earth originate in this region of the Galaxy. Yet because of confusion from line-of-sight integration, the magnetic field structure in the Galactic center is not well known and no large-scale magnetic field model exists at present. Aims. In this paper, we develop a magnetic field model, derived from observational data on the diffuse gas, nonthermal radio filaments, and molecular clouds. Methods. We derive an analytical description of the magnetic field structure in the central molecular zone by combining observational data with the theoretical modeling of the basic properties of magnetic fields. Results. We provide a first description of the large-scale magnetic field in the Galactic center region. We present first test simulations of cosmic-ray propagation and the impact of the magnetic field structure on the cosmic-ray distribution in the three dimensions. Conclusions. Our magnetic field model is able to describe the main features of polarization maps; it is particularly important to note that they are significantly better than standard global Galactic magnetic field models. It can also be used to model cosmic-ray propagation in the Galactic center region more accurately.

scholarly journals Modeling the Galactic ¾ keV X-ray Background

1997 ◽  
Vol 166 ◽  
pp. 309-320
Author(s):  
M.J. Freyberg ◽  
J.H.M.M. Schmitt
Keyword(s):  
Probability Distribution ◽  
Point Source ◽  
Large Scale ◽  
Galactic Halo ◽  
Galactic Center ◽  
Significant Excess ◽  
X Ray ◽  
Multipole Analysis ◽  
Sky Survey ◽  
X Ray Background

AbstractWe have analyzed the ROSAT PSPC all-sky survey maps of the soft X-ray background (SXRB) in the ¾ keV band. One approach was to study the large-scale distribution of the X-ray emission with a multipole analysis. Here a significant dipole toward the galactic center region was found. This is interpreted in terms of variation of distant X-ray emission, e.g. galactic halo. Also a smallscale structure analysis of the ¾ keV X-ray sky has been performed and a new analytic fluctuation probability distribution has been derived. No significant excess over the expected extragalactic point source contribution has been found. Finally, X-ray colours have been used to investigate spectral variations of the SXRB.

scholarly journals Gamma-Ray Imaging of the Galactic Center Region

1989 ◽  
Vol 136 ◽  
pp. 581-585
Author(s):  
W. R. Cook ◽  
D. M. Palmer ◽  
T. A. Prince ◽  
S. M. Schindler ◽  
C. H. Starr ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Galactic Center ◽  
Coded Aperture ◽  
Center Region ◽  
Gamma Ray Imaging ◽  
The Galaxy ◽  
Γ Ray ◽  
Luminous Objects

The Caltech imaging γ-ray telescope was launched by balloon from Alice Springs, NT, Australia and performed observations of the galactic center during the period 12.62 to 13.00 April 1988 UT. The first coded-aperture images of the galactic center region at energies above 30 keV show a single strong γ-ray source which is located 0.7±0.1° from the galactic nucleus and is tentatively identified as 1E1740.7-2942. If the source is at the distance of the galactic center, it is one of the most luminous objects in the galaxy at energies from 35 to 200 keV.

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