Results 21 to 30 of about 217,419 (251)
Strong evidence that the galactic bulge is shining in gamma rays [PDF]
Journal of Cosmology and Astroparticle Physics, 2019 There is growing evidence that the Galactic Center Excess identified in the Fermi-LAT gamma-ray data arises from a population of faint astrophysical sources.
O. Macias +5 more
semanticscholar +1 more source
Annual Review of Astronomy and Astrophysics, 1997 ▪ Abstract We discuss the present observational and theoretical understanding of the stellar populations of bulges and their implications for galaxy formation and evolution. The place of bulges as key to the Hubble Sequence remains secure, but some old paradigms are giving way to new ones as observations develop. Detailed studies of Local Group bulges
Wyse, Rosemary F. G. +2 more
openaire +4 more sources
Formation of Galactic Bulges [PDF]
The Astrophysical Journal, 1999 Revised version accepted for publication in ...
Gnedin, Nickolay Y. +2 more
openaire +2 more sources
NuSTAR tests of sterile-neutrino dark matter: New Galactic bulge observations and combined impact [PDF]
Physical Review D, 2019 We analyze two dedicated NuSTAR observations with exposure ${\sim}190$ ks located ${\sim}10^\circ$ from the Galactic plane, one above and the other below, to search for x-ray lines from the radiative decay of sterile-neutrino dark matter.
B. Roach +6 more
semanticscholar +1 more source
The Astrophysical Journal, 2023 We present wide-field, high resolution maps of the color excess for 14 globular clusters toward the Southern Galactic bulge. The maps were derived using Gaia EDR3 astrometry and stellar photometry from the Blanco DECam Bulge Survey, which is a deep, wide-
Justin A. Kader +11 more
doaj +1 more source
Tracking millisecond pulsars responsible for the Fermi GeV excess [PDF]
EPJ Web of Conferences, 2023 More than 10 years ago, an excess of γ-ray photons coming from the Galactic center was discovered in the Fermi-LAT data. First attributed to dark matter, it has since been shown that it should have at least a partial stellar origin. One hypothesis is the
Berteaud Joanna +2 more
doaj +1 more source
The origin of stellar populations in the Galactic bulge from chemical abundances [PDF]
Monthly notices of the Royal Astronomical Society, 2019 In this work, we study the formation and chemical evolution of the Galactic bulge with particular focus on the abundance pattern ([Mg/Fe] versus [Fe/H]), metallicity, and age distribution functions.
F. Matteucci +6 more
semanticscholar +1 more source
The Fermi-LAT GeV excess as a tracer of stellar mass in the Galactic bulge [PDF]
Nature Astronomy, 2017 An anomalous emission component at energies of a few gigaelectronvolts and located towards the inner Galaxy is present in the Fermi-LAT data. At present, the two most promising explanations are the annihilation of dark matter particles or the presence of
R. Bartels +3 more
semanticscholar +1 more source
The Gaia-ESO Survey: Exploring the complex nature and origins of the Galactic bulge populations [PDF]
, 2017 Context. As observational evidence steadily accumulates, the nature of the Galactic bulge has proven to be rather complex: the structural, kinematic, and chemical analyses often lead to contradictory conclusions.
Á. Rojas-Arriagada +38 more
semanticscholar +1 more source
Microlensing Towards the Galactic Bulge [PDF]
Symposium - International Astronomical Union, 1993 We describe an ongoing survey to search for dark matter via lensing events of stars in the Galactic Bulge. The principal properties of the survey are described, and some preliminary results are shown for newly-discovered variables. We discuss some of the projects related to the study of the Galactic Bulge that can be addressed using these data, and ...
Andrzej Udalski +7 more
openaire +1 more source