Results 111 to 120 of about 35,709 (214)

Discovery of two new millisecond pulsars toward the Galactic bulge

Astronomy & Astrophysics
Aims. The mysterious Galactic center (GC) gamma-ray (γ-ray) excess (GCE) could be explained by a large population of millisecond pulsars (MSPs) hiding in the Galactic bulge, too faint to be detected as individual high-energy point sources by the Fermi ...
Berteaud J., Calore F., Clavel M., Dai S., Deneva J. S., Hyman S., Schinzel F. K., Ridolfi A., Ransom S. M., Abbate F., Clark C. J., Kramer M., Thongmeearkom T., Stappers B. W., Barr E. D., Breton R. P.   +15 more
doaj   +1 more source

Positron Transport and Annihilation in the Galactic Bulge

Galaxies, 2018
The annihilation of positrons in the Milky Way Galaxy has been observed for ∼50 years; however, the production sites of these positrons remains hard to identify.
Fiona Helen Panther
doaj   +1 more source

3-Dimensional Kinematics in low foreground extinction windows of the Galactic Bulge: Radial Velocities for 6 bulge fields

, 2012
The detailed structure of the Galactic bulge still remain uncertain. The strong difficulties of obtaining observations of stars in the Galactic bulge have hindered the acquisition of a kinematic representation for the inner kpc of the Milky Way.
Anderson, Anderson, Athanassoula, Babusiaux, Benjamin, Binney, Cabrera-Lavers, Clarkson, Collinge, Cudworth, Dwek, Englmaier, Holtzman, Howard, K. Kuijken, Kozłowski, Kuijken, Kuijken, M. Soto, Martinez-Valpuesta, McWilliam, McWilliam, Minniti, Nataf, Peterson, Picaud, R. M. Rich, Rangwala, Rattenbury, Rattenbury, Rich, Rich, Rich, Sadler, Saito, Schwarzschild, Schwarzschild, Sharples, Shen, Soto, Spaenhauer, Terndrup, Tonry, Zhao, Zhao, Zhao, Zhao, Zoccali   +47 more
core   +1 more source

SPI observations of positron annihilation radiation from the 4th galactic quadrant: sky distribution

, 2004
During its first year in orbit the INTEGRAL observatory performed deep exposures of the Galactic Center region and scanning observations of the Galactic plane.
Allain, M., Chapuis, C., Cisana, E., Durouchoux, Ph., Gehrels, N., Guessoum, N., Harris, M. J., Jean, P., Knoedlseder, J., Lonjou, V., Schoenfelder, V., Skinner, G. K., Teegarden, B. J., Valsesia, M., Vedrenne, G., von Ballmoos, P., Weidenspointner, G.   +16 more
core   +1 more source

Inner galactic disc metallicity distributions and the bulge-disc relation

EPJ Web of Conferences, 2012
The intermediate-to-old population of the inner galactic disk remains a relatively uncharted territory. We present the results of a high resolution spectroscopic survey of over 200 red clump stars in the inner galactic disc (3–5 kpc from the galactic ...
Haywood M., Gómez A., Babusiaux C., Hill V., Katz D., Royer F.   +5 more
doaj   +1 more source

The WFC3 Galactic Bulge Treasury Program: Metallicity Estimates for the Stellar Population and Exoplanet Hosts

, 2010
We present new UV-to-IR stellar photometry of four low-extinction windows in the Galactic bulge, obtained with the Wide Field Camera 3 on the Hubble Space Telescope (HST).
Anderson, Jay, Bond, Howard E., Brown, Thomas M., Casertano, Stefano, Ferguson, Henry C., Jeffery, Elizabeth J., Livio, Mario, Minniti, Dante, Panagia, Nino, Renzini, Alvio, Sahu, Kailash, Smith, Ed, Tumlinson, Jason, Valenti, Elena, Valenti, Jeff A., VandenBerg, Don A., Zoccali, Manuela   +16 more
core   +1 more source

Nucleosynthesis of Cobalt and Copper

Galaxies
Chemical abundances of cobalt (Co; Z = 27) and copper (Cu; Z = 29) in bulge and halo stars are presented and compared with chemical evolution models.
Beatriz Barbuy, Amâncio C. S. Friaça, Heitor Ernandes   +2 more
doaj   +1 more source

Ancient Relic Moderately Metal-rich Bulge Cluster Tonantzintla 2

The Astrophysical Journal Letters
The assembly history of the Galactic bulge is intimately tied to the formation of the proto–Milky Way, yet reconstructing this early phase is difficult because mergers and secular evolution have erased most of its original structure.
Sergio Ortolani, Stefano O. Souza, Domenico Nardiello, Beatriz Barbuy, Eduardo Bica, Bernardo P.L. Ferreira, Cristina Chiappini, José G. Fernández-Trincado, Heitor Ernandes   +8 more
doaj   +1 more source

Dark Atoms and the Positron-Annihilation-Line Excess in the Galactic Bulge

Advances in High Energy Physics, 2014
It was recently proposed that stable particles of charge −2, O--, can exist and constitute dark matter after they bind with primordial helium in O-helium (OHe) atoms.
J.-R. Cudell, M. Yu. Khlopov, Q. Wallemacq   +2 more
doaj   +1 more source

RR Lyrae binary systems in the Galactic bulge

EPJ Web of Conferences, 2017
The possibility of a direct mass measurement of RR Lyrae variable stars in binary systems has remained elusive for many years, due to the apparent paucity of such systems.
Hajdu Gergely, Catelan Márcio
doaj   +1 more source