Results 41 to 50 of about 44,865 (311)

The Flattening Metallicity Gradient in the Milky Way’s Thin Disk [PDF]

The Astrophysical Journal, 2021
Abstract We calculate the ages, orbits and phase-space coordinates for a sample of ∼4 million LAMOST and Gaia stars. The ages are cross-matched and compared with values from two other popular age catalogs, which derive the ages using different methods.
John J. Vickers, Juntai Shen, Zhao-Yu Li
openaire   +2 more sources

Clues to the formation of the Milky Way’s thick disk [PDF]

Astronomy & Astrophysics, 2015
We analyse the chemical properties of a set of solar vicinity stars, and show that the small dispersion in abundances of α-elements at all ages provides evidence that the SFH has been uniform throughout the thick disk. In the context of long time scale infall models, we suggest that this result points either to a limited dependence of the gas accretion
Haywood, M., Di Matteo, P., Snaith, O., Lehnert, M.   +3 more
openaire   +4 more sources

Substructure in CDM Halos and the Heating of Stellar Disks [PDF]

, 2001
Numerical simulations have revealed the presence of long-lived substructure in Cold Dark Matter (CDM) halos. These surviving cores of past merger and accretion events vastly outnumber the known satellites of the Milky Way.
Navarro, Julio F.
core   +3 more sources

RINGS AND RADIAL WAVES IN THE DISK OF THE MILKY WAY [PDF]

The Astrophysical Journal, 2015
19figures, 2tables, ApJ ...
Yan Xu, Heidi Jo Newberg, Jeffrey L. Carlin, Chao Liu, Licai Deng, Jing Li, Ralph Schönrich, Brian Yanny   +7 more
openaire   +2 more sources

All-sky Kinematics and Chemistry of Monoceros Stellar Overdensity

The Astrophysical Journal, 2023
We explore the kinematic and chemical properties of the Monoceros stellar overdensity by combining data from the Two Micron All Sky Survey, Wide-field Infrared Survey Explorer, APOGEE, and Gaia.
Lais Borbolato, Hélio D. Perottoni, Silvia Rossi, Guilherme Limberg, Angeles Pérez-Villegas, Friedrich Anders, Teresa Antoja, Chervin F. P. Laporte, Helio J. Rocha-Pinto, Rafael M. Santucci   +9 more
doaj   +1 more source

Modelling the HI halo of the Milky Way [PDF]

, 2010
Aims: we studied the global distribution and kinematics of the extra-planar neutral gas in the Milky Way. Methods: we built 3D models for a series of Galactic HI layers, projected them for an inside view, and compared them with the Leiden-Argentina-Bonn ...
A. Marasco, Bajaja, Binney, Boomsma, Boomsma, Bregman, Celnik, Collins, F. Fraternali, Ford, Fraternali, Fraternali, Fraternali, Fraternali, Fraternali, Fraternali, Habing, Heald, Heald, Kalberla, Kalberla, Kalberla, Kamphuis, Kamphuis, Kaufmann, Kerr, Kerr, Levine, Levine, Lockman, Lockman, Lockman, Malhotra, Marinacci, Marinacci, McClure-Griffiths, Münch, Oort, Oosterloo, Pidopryhora, Reid, Reynolds, Rossa, Sancisi, Sembach, Shane, Shapiro, Smith, Spitzer, Stil, Thilker, Thom, Tripp, Wakker, Wakker, Wakker, Wakker, Wakker, Wakker   +58 more
core   +2 more sources

Are disk galaxies the progenitors of giant ellipticals? [PDF]

, 2007
A popular formation scenario for giant elliptical galaxies proposes that they might have formed from binary mergers of disk galaxies. Difficulties with the scenario that emerged from earlier studies included providing the necessary stellar mass and ...
Barden, Bell, Bell, Bell, Bender, Bender, Bender, Bender, Binney, Brinchmann, Ciotti, Cox, Côté, Côté, Dasyra, Dasyra, Davies, de Jong, Dehnen, di Serego Alighieri, Ferrarese, Genzel, Gerhard, Gerhard, González-García, Hogg, Hogg, Hopkins, Hopkins, Hopkins, Hubble, Jeremiah P. Ostriker, Jesseit, Johansson, Khochfar, Khochfar, Kormendy, Kriek, Larson, Larson, Larson, Li, McIntosh, Naab, Naab, Naab, Naab, Nagamine, Nakamura, Negroponte, Ostriker, Rix, Robertson, Robertson, Rothberg, Rothberg, Springel, Surma, Thomas, Thorsten Naab, Toomre, Toomre, Treu, Trujillo, Trujillo, van der Wel, van Dokkum, van Dokkum, van Dokkum, White   +69 more
core   +4 more sources

The evolution of carbon and oxygen in the bulge and disk of the Milky Way [PDF]

Astronomy & Astrophysics, 2009
The evolution of C and O abundances in the Milky Way can impose strong constraints on stellar nucleosynthesis and help understanding the formation and evolution of our Galaxy. The aim is to review the measured C and O abundances in the disk and bulge of the Galaxy and compare them with model predictions.
CESCUTTI, GABRIELE, MATTEUCCI, MARIA FRANCESCA, McWilliam, A., Chiappini, C.   +3 more
openaire   +3 more sources

Disentangling Stellar Age Estimates from Galactic Chemodynamical Evolution

The Astrophysical Journal, 2023
Stellar ages are key for determining the formation history of the Milky Way, but are difficult to measure precisely. Furthermore, methods that use chemical abundances to infer ages may entangle the intrinsic evolution of stars with the chemodynamical ...
Jeff Shen, Joshua S. Speagle, J. Ted Mackereth, Yuan-Sen Ting, Jo Bovy   +4 more
doaj   +1 more source

Abundances of Disk Planetary Nebulae in M31 and the Radial Oxygen Gradient

, 2011
We have obtained spectra of 16 planetary nebulae in the disk of M31 and determined the abundances of He, N, O, Ne, S and Ar. Here we present the median abundances and compare them with previous M31 PN disk measurements and with PNe in the Milky Way.
Balick, B., Henry, R. B. C., Kwitter, K. B., Lehman, E. M. M.   +3 more
core   +1 more source