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 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 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 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.

scholarly journals Discovery of K-Shell Emission Lines of Neutral Atoms in the Galactic Center Region

2010 ◽  
Vol 62 (2) ◽  
pp. 423-429 ◽  
Author(s):  
Masayoshi Nobukawa ◽  
Katsuji Koyama ◽  
Takeshi Go Tsuru ◽  
Syukyo G. Ryu ◽  
Vincent Tatischeff
Keyword(s):  
Galactic Center ◽  
Emission Lines ◽  
Neutral Atoms ◽  
Center Region

scholarly journals Remarkable Symmetries in the Milky Way Disc's Magnetic Field

2011 ◽  
Vol 28 (2) ◽  
pp. 171-176 ◽  
Author(s):  
P. P. Kronberg ◽  
K. J. Newton-McGee
Keyword(s):  
Magnetic Structure ◽  
Large Scale ◽  
Milky Way ◽  
Galactic Center ◽  
Galactic Plane ◽  
Galactic Disk ◽  
Field Structure ◽  
Field Pattern ◽  
Close Coupling ◽  
Sign Change

AbstractWe apply a new, expanded compilation of extragalactic source Faraday rotation measures (RM) to investigate the broad underlying magnetic structure of the Galactic disk at latitudes ∣b∣ ≲15° over all longitudes l, where our total number of RMs is comparable to those in the combined Canadian Galactic Plane Survey (CGPS) at ∣b∣ < 4° and the Southern Galactic Plane (SGPS) ∣b∣<1.5°. We report newly revealed, remarkably coherent patterns of RM at ∣b∣≲15° from l∼270° to ∼90° and RM(l) features of unprecedented clarity that replicate in l with opposite sign on opposite sides of the Galactic center. They confirm a highly patterned bisymmetric field structure toward the inner disc, an axisymmetic pattern toward the outer disc, and a very close coupling between the CGPS/SGPS RMs at ∣b∣≲3° (‘mid-plane’) and our new RMs up to ∣b∣∼15° (‘near-plane’). Our analysis also shows the vertical height of the coherent component of the disc field above the Galactic disc's mid-plane—to be ∼1.5 kpc out to ∼6 kpc from the Sun. This identifies the approximate height of a transition layer to the halo field structure. We find no RM sign change across the plane within ∣b∣∼15° in any longitude range. The prevailing disc field pattern and its striking degree of large-scale ordering confirm that our side of the Milky Way has a very organized underlying magnetic structure, for which the inward spiral pitch angle is 5.5°±1° at all ∣b∣ up to ∼12° in the inner semicircle of Galactic longitudes. It decreases to ∼0° toward the anticentre.

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