Results 31 to 40 of about 153,252 (195)

Improved Galactic diffuse emission model strengthens the case for a Millisecond Pulsar explanation of the Fermi GeV excess

SciPost Physics Proceedings, 2023
After more than a decade since its discovery, the Galactic center gamma-ray excess - discovered with the Fermi Large Area Telescope - remains puzzling. While the spectrum of the signal can be explained by either dark matter or an unresolved population of
Oscar Macias, Martin Pohl, Chris Gordon, Phaedra Coleman
doaj   +1 more source

TROJAN STARS IN THE GALACTIC CENTER [PDF]

The Astrophysical Journal, 2009
17 pages, 9 figures, accepted for publication in ...
Fujii, Michiko, Iwasawa, Masaki, Funato, Yoko, Makino, Junichiro   +3 more
openaire   +2 more sources

Sources and Radiations of the Fermi Bubbles

Universe
Two enigmatic gamma-ray features in the galactic central region, known as Fermi Bubbles (FBs), were found from Fermi-LAT data. An energy release, (e.g., by tidal disruption events in the Galactic Center, GC), generates a cavity with a shock that expands ...
Vladimir A. Dogiel, Chung-Ming Ko
doaj   +1 more source

Discovery of an Unbound Hyper-Velocity Star in the Milky Way Halo [PDF]

, 2005
We have discovered a star, SDSS J090745.0+024507, leaving the Galaxy with a heliocentric radial velocity of +853+-12 km/s, the largest velocity ever observed in the Milky Way halo.
Blaauw A., Conlon E. S., Holmgren D. E., Margaret J. Geller, Michael J. Kurtz, Perryman M. A. C., Poveda A., Rolleston W. R. J., Schaller G., Scott J. Kenyon, Warren R. Brown   +10 more
core   +1 more source

Constraining the Stellar Mass Function in the Galactic Center via Mass Loss from Stellar Collisions

Advances in Astronomy, 2011
The dense concentration of stars and high-velocity dispersions in the Galactic center imply that stellar collisions frequently occur. Stellar collisions could therefore result in significant mass loss rates.
Douglas Rubin, Abraham Loeb
doaj   +1 more source

Metal-poor hypervelocity star candidates from the Sloan Digital Sky Survey

, 2011
Hypervelocity stars are believed to be ejected out from the Galactic center through dynamical interactions of (binary) stars with the central massive black hole(s).
Abadi, Bartko, Blaauw, Bromley, Brown, Brown, Dong, Edelmann, Gnedin, Gould, Ivezić, Kenyon, Kiziltan, Kollmeier, Kollmeier, Koposov, Lee, Lu, Lu, Merritt, Munn, Perets, Perets, Poveda, Rastegaev, Sesana, Teyssier, Williams, Xue, York, Yu, Zhang   +31 more
core   +1 more source

Evidence for GeV emission from the Galactic Center Fountain [PDF]

, 1997
The region near the Galactic center may have experienced recurrent episodes of injection of energy in excess of $\sim$ 10$^{55}$ ergs due to repeated starbursts involving more than $\sim$ 10$^4$ supernovae.
Dixon, D. D., Hartmann, D. H., Kolaczyk, E. D., Samimi, J.   +3 more
core   +3 more sources

The Galactic Center in Color: Measuring Extinction with High-proper-motion Stars

The Astronomical Journal
The Milky Way’s central parsec is a highly extinguished region with a population of high-proper-motion stars. We have tracked 145 stars for ∼10 yr at wavelengths between 1 and 4 μ m to analyze extinction effects in color–magnitude space. Approximately 30%
Zoë Haggard, Andrea M. Ghez, Shoko Sakai, Abhimat K. Gautam, Tuan Do, Jessica R. Lu, Matthew Hosek, Mark R. Morris, Sean Granados   +8 more
doaj   +1 more source

Toward Measuring the Microlensing Event Rate in the Galactic Center. I. Event Detection from the UKIRT Microlensing Survey Data

The Astrophysical Journal Supplement Series, 2023
To overcome the high optical extinction, near-infrared (NIR) observations are needed for probing the microlensing events toward the Galactic center. The 2015–2019 UKIRT microlensing survey toward the Galactic center is the first dedicated precursor NIR ...
Yongxin Wen, Weicheng Zang, Bo Ma
doaj   +1 more source

Improving the Angular Resolution of EGRET and New Limits on Supersymmetric Dark Matter Near the Galactic Center

, 2002
Using the EGRET data and an improved point source analysis, including an energy dependent point spread function and an unbinned maximum likelihood technique, we have been able to place considerably lower limits on the gamma ray flux from the galactic ...
Allanach, B. Dingus, Bergstrom, Bergstrom, Bergstrom, D. Hooper, Edsjo, Ellis, Goldberg, Gondolo, Gondolo, Hall, Moore, Navarro, Navarro, Pohl, Ullio, Weinberg   +17 more
core   +1 more source