Results 71 to 80 of about 2,386 (209)
Advances in Astronomy, 2015 In recent years free-floating planets (FFPs) have drawn a great interest among astrophysicists. Gravitational microlensing is a unique and exclusive method for their investigation which may allow obtaining precious information about their mass and ...
Lindita Hamolli +3 more
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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
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The Galactic bulge exploration
Astronomy & AstrophysicsWe present a new set of period–absolute magnitude–metallicity (PMZ) relations for single-mode RR Lyrae stars calibrated for the optical GBP, V, G, GRP, near-infrared I, J, H, and Ks passbands. We compiled a large dataset (over 100 objects) of fundamental and first-overtone RR Lyrae pulsators consisting of mean intensity magnitudes, reddenings ...
Z. Prudil +3 more
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The Astrophysical JournalJWST/NIRCam observations reveal dense stellar cores in high-redshift galactic bulges, indicative of sustained star formation and potential stellar accretion.
Shuo Zhai +4 more
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The Astrophysical JournalWe present a suite of six high-resolution chemodynamical simulations of isolated galaxies, spanning observed disk-dominated environments on the star-forming main sequence, as well as quenched, bulge-dominated environments.
Sarah M. R. Jeffreson +7 more
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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. +5 more
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Dynamics of the galactic bulge-bar
AIP Conference Proceedings, 1992 The non‐circular velocities of gas in the inner few degrees of our Galaxy would arise naturally if the Milky Way had a small bar at its center. Recent studies suggest that this bar is more rapidly rotating than had been previously suggested; corotation probably lies near R=2.4 kpc. The circular speed associated with the Galaxy’s monopole component must
Binney, J, Gerhard, O
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Probing MACHOs toward the Galactic Bulge [PDF]
The Astrophysical Journal, 2005 If the massive compact halo object (MACHO) fraction of the Galactic dark halo is f ~ 20% as suggested by some microlensing experiments, then about 1.2% of lensing events toward the Galactic bulge are due to MACHOs. For the 40% of these that lie nearby (D_l < 4 kpc), measurement of their distance D_l would distinguish them from bulge lenses, while ...
openaire +3 more sources
Nucleosynthesis of Cobalt and Copper
GalaxiesChemical 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 +2 more
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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 +2 more
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