Results 91 to 100 of about 92,502 (190)

Fountain-driven gas accretion by the Milky Way

, 2011
Accretion of fresh gas at a rate of ~ 1 M_{sun} yr^{-1} is necessary in star-forming disc galaxies, such as the Milky Way, in order to sustain their star-formation rates. In this work we present the results of a new hydrodynamic simulation supporting the
Binney, J., Ciotti, L., Fraternali, F., Londrillo, P., Marinacci, F., Nipoti, C.   +5 more
core   +2 more sources

Mass Distribution and Bulge Formation in the Milky Way Galaxy [PDF]

EAS Publications Series, 2006
Eight pages, one figure. Invited Review, Proceedings of 21st IAP Colloquium, 'Mass Profiles and Shapes of Cosmological Structures', eds. G.
openaire   +3 more sources

Rising from the Ashes: A Metallicity-dependent Star Formation Gap Splits the Milky Way’s α Sequences

The Astrophysical Journal
The elemental abundance distribution of stars encodes the history of the gas-phase abundance in the Milky Way. Without a large, unbiased sample of highly precise stellar ages, the exact timing and nature of this history must be inferred from the ...
Angus Beane
doaj   +1 more source

Impact of the low solar abundance on the ages of globular clusters

, 2010
We present the result of our investigation on the impact of the low Solar abundance of Asplund and collaborators (2004) on the derived ages for the oldest star clusters based on isochrone fittings. We have constructed new stellar models and corresponding
Kim, Yong -Cheol, Yi, Sukyoung K.
core   +1 more source

True Pair-instability Supernova Descendant: Implications for the First Stars’ Mass Distribution

The Astrophysical Journal Letters
The initial mass function (IMF) of the first Population III (Pop III) stars remains a persistent mystery. Their predicted massive nature implies the existence of stars exploding as pair-instability supernovae (PISNe), but no observational evidence had ...
Ioanna Koutsouridou, Stefania Salvadori, Ása Skúladóttir   +2 more
doaj   +1 more source

Star formation history in the solar neighborhood: the link between stars and cosmology

, 2001
Using a cosmological galactic evolutionary approach to model the Milky Way, we calculate the star formation history (SFH) of the solar neighborhood. The good agreement we obtain with the observational inferences suggests that our physical model describes
C Chiosi, C Firmani, C Firmani, C Firmani, CM Baugh, E Tolstoy, G Bertelli, G Kauffmann, J Navarro, JDW Binney, S Boissier, S Kent, SDM White, V Avila-Reese, V Avila-Reese, V Avila-Reese, V Avila-Reese, X Hernández, X Hernández   +18 more
core   +2 more sources

Precise Asteroseismic Ages for the Helmi Streams

The Astrophysical Journal
The Helmi streams are remnants of a dwarf galaxy that was accreted by the Milky Way and whose stars now form a distinct kinematic and chemical substructure in the Galactic halo. Precisely age-dating these typically faint stars of extragalactic origin has
Christopher J. Lindsay, Marc Hon, J. M. Joel Ong, Rafael A. García, Dinil B. Palakkatharappil, Jie Yu, Tanda Li, Tomás Ruiz-Lara, Amina Helmi   +8 more
doaj   +1 more source

The Formation of the Milky Way Nuclear Cluster

, 2011
4 pages, 4 figures, To appear in "Advances in Computational Astrophysics: methods, tools and outcomes", ASP Conference Series, R. Capuzzo-Dolcetta, M. Limongi and A.
A. Mastrobuono Battisti, CAPUZZO DOLCETTA, Roberto Angelo   +1 more
openaire   +3 more sources

Subhaloes in Self-Interacting Galactic Dark Matter Haloes

, 2012
We present N-body simulations of a new class of self-interacting dark matter models, which do not violate any astrophysical constraints due to a non-power-law velocity dependence of the transfer cross section which is motivated by a Yukawa-like new gauge
Abraham Loeb, Arkani-Hamed, Bode, Boyarsky, Boylan-Kolchin, Boylan-Kolchin, Buckley, Burkert, Carlson, Colín, Colín, Craig, Davé, de Blok, de Laix, Diemand, D’Onghia, D’Onghia, Feng, Feng, Finkbeiner, Firmani, Gao, Gilmore, Gnedin, Goerdt, Guo, Hernquist, Jardel, Jesus Zavala, Kleyna, Klypin, Kochanek, Koda, Koposov, Kuzio de Naray, Loeb, Lovell, Macciò, Machacek, Mark Vogelsberger, Miralda Escudé, Moore, Moore, Navarro, Navarro, Neto, Papastergis, Peñarrubia, Pontzen, Randall, Spergel, Springel, Springel, Springel, Strigari, Villaescusa-Navarro, Walker, Walker, Wang, Wolf, Yoshida, Yoshida, Zavala   +63 more
core   +1 more source

Milky Way’s Metal-poor Stars Display Chemical Transition near the Solar Radius

The Astrophysical Journal Letters
The metal-poor stars of a galaxy offer insights into that galaxy’s early formation processes and accretion history. Here, we investigate whether the metal-poor stars of our Milky Way Galaxy exhibit any characteristic trends in Galactocentric distance ...
Khyati Malhan
doaj   +1 more source