Observations of gamma-ray line emission from the Galactic Center region

1982 ◽  
Author(s):  
Allan S. Jacobson
Keyword(s):  
Gamma Ray ◽  
Galactic Center ◽  
Line Emission ◽  
Center Region

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 Nuclear interaction gamma-ray lines from the Galactic center region

2009 ◽  
Vol 508 (1) ◽  
pp. 1-7 ◽  
Author(s):  
V. A. Dogiel ◽  
V. Tatischeff ◽  
K. S. Cheng ◽  
D. O. Chernyshov ◽  
C. M. Ko ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Galactic Center ◽  
Nuclear Interaction ◽  
Center Region

scholarly journals LIGHT SUPERCONDUCTING STRINGS IN THE GALAXY

2007 ◽  
Vol 16 (12b) ◽  
pp. 2399-2405 ◽  
Author(s):  
FRANCESC FERRER ◽  
TANMAY VACHASPATI
Keyword(s):  
Magnetic Field ◽  
Spatial Distribution ◽  
Particle Physics ◽  
Milky Way ◽  
Gamma Ray ◽  
Galactic Center ◽  
Line Emission ◽  
Galactic Magnetic Field ◽  
The Galaxy ◽  
Intense Source

Observations of the Milky Way by the SPI/INTEGRAL satellite have confirmed the presence of a strong 511 keV gamma ray line emission from the bulge, which requires an intense source of positrons in the galactic center. These observations are hard to account for by conventional astrophysical scenarios, whereas other proposals, such as light DM, face stringent constraints from the diffuse gamma ray background. Here we suggest that light superconducting strings could be the source of the observed 511 keV emission. The associated particle physics, at the ~ 1 TeV scale, is within the reach of planned accelerator experiments, while the distinguishing spatial distribution, proportional to the galactic magnetic field, could be mapped by SPI or by future, more sensitive satellite missions.

scholarly journals De-Excitation Gamma-ray Line Emission from the Galactic Center

2010 ◽  
Author(s):  
Dmitry Chernyshov ◽  
V. A. Dogiel ◽  
V. Tatischeff ◽  
Kwong-Sang Cheng ◽  
Chung-Ming Ko ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Galactic Center ◽  
Line Emission

scholarly journals Observation of Diffuse CII Emission in the Galactic Center Region

1989 ◽  
Vol 136 ◽  
pp. 145-149
Author(s):  
H. Okuda ◽  
H. Shibai ◽  
T. Nakagawa ◽  
T. Matsuhara ◽  
T. Maihara ◽  
...  
Keyword(s):  
Galactic Center ◽  
Line Emission ◽  
Wide Area ◽  
Strong Emission ◽  
Spectroscopic Observations ◽  
Center Region ◽  
Fabry Perot ◽  
Galactic Longitude

Spectroscopic observations of CII line emission at 157.7 μm have been made of the Galactic Center region with a Fabry-Perot spectrometer onboard a balloon telescope. Strong emission has been detected ubiquitously in a wide area extending between ± 0.7° in galactic longitude. A ring-like structure is suggested from the double lobed distribution of the emission around the Galactic Center.

The gamma-ray spectrum of the Galactic center region

1985 ◽  
Vol 294 ◽  
pp. L13 ◽  
Author(s):  
G. R. Riegler ◽  
J. C. Ling ◽  
W. A. Mahoney ◽  
W. A. Wheaton ◽  
A. S. Jacobson
Keyword(s):  
Gamma Ray ◽  
Galactic Center ◽  
Center Region

scholarly journals A Survey of Radio Recombination Line Emission From the Galactic Center Region

1989 ◽  
Vol 136 ◽  
pp. 159-166 ◽  
Author(s):  
K. R. Anantharamaiah ◽  
Farhad Yusef-Zadeh
Keyword(s):  
Galactic Center ◽  
Line Emission ◽  
Radio Continuum ◽  
Strong Line ◽  
Line Profiles ◽  
Ionized Gas ◽  
Center Region ◽  
Radio Recombination Line ◽  
Nonthermal Emission ◽  
Sgr A

Preliminary results of a systematic survey of H78α, H91α and H98β emission from the inner 40′ of the Galactic center region are presented. This region consists of two prominent continuum features, the Sgr A complex and the radio continuum Arc. In spite of much nonthermal emission arising from these two features, we detected strong line emission with large line widths in more than half of the observed 130 positions. Many of the detections are new, in particular −50 km s−1 ionized gas linking the Sgr A complex and the Arc, β line emission from GO.1+0.08 (the arched filaments), and α line emission from the loop-like structures which surround the non-thermal filaments near G0.2−0.05. We find that much of the detected lines are probably associated with the −50 km s−1 and the 20 km s−1 molecular clouds, known to lie near the Galactic center. We present line profiles of a number of Galactic center sources including Sgr B1, Sgr C and Sgr D.

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