Results 301 to 310 of about 247,055 (324)

The Formation and Early Evolution of the Milky Way Galaxy

Science, 2000
Recent observations indicate that the Milky Way may have formed by aggregation of gas and stars from a reservoir of preexisting small galaxies in the local universe. The process probably began more than 12 billion years ago with material of different original angular momentum following two separate evolutionary lines, one into the slowly rotating halo ...
exaly   +4 more sources

EVOLUTION OF THE MILKY WAY DISK

2006
The Solar neighbourhood is where the physical basis for models of the evolu- tion of spiral galaxy disks can be tested most stringently. A new survey has provided full space motions, metallicities, ages, and duplicity information for over 14,000 nearby F and G dwarfs.
Nordström, Birgitta, Andersen, Johannes
openaire   +1 more source

The Evolution of the Milky Way Disk

2000
The Milky Way is a heterogeneous system, with at least three components (halo, bulge, disk) having very different chemical, photometric and kinematical properties. A reliable model for the evolution of the Milky Way accounting for those properties does not exist at present.
N. Prantzos, S. Boissier
openaire   +1 more source

The formation and survival of the Milky Way’s oldest stellar disk

Nature Astronomy
It remains a mystery when our Milky Way first formed a stellar disk component that survived and maintained its disk structure from subsequent galaxy mergers.
Maosheng Xiang, H. Rix, Hang Yang, Jifeng Liu, Yang Huang, N. Frankel   +5 more
semanticscholar   +1 more source

No certainty of a Milky Way–Andromeda collision

Nature Astronomy
It is commonly believed that our own Milky Way is on a collision course with the neighbouring Andromeda galaxy. As a result of their merger, predicted in around 5 billion years, the two large spiral galaxies that define the present Local Group would form
T. Sawala, Jehanne Delhomelle, A. Deason, C. Frenk, J. Häkkinen, P. H. Johansson, A. Keitaanranta, A. Rawlings, R. Wright   +8 more
semanticscholar   +1 more source

CNO Evolution: Milky Way, Dwarf Galaxies and DLAs

Astrophysics and Space Science, 2003
We compute the evolution of the C, N, O and Fe abundances as a function of time and galactocentric distance in the Milky Way (MW) for different sets of stellar yields. We then apply the ‘best’ nucleosynthesis prescriptions found for the MW to other galaxies.
Cristina Chiappini, Donatella Romano, Francesca Matteucci   +2 more
openaire   +1 more source

Formation and Evolution of the Milky Way

2003
The problem of understanding the formation of the Galaxy is part of the problem of explaining galaxy formation in general. In particular, we should try to understand the relative importance of mergers and dissipative collapse in the formation of all galaxies, and whether the observational information about our Galaxy is enough to explain the timescales
openaire   +1 more source

Chemical evolution in the Milky Way Disk

AIP Conference Proceedings, 2006
Classical models of galactic evolution predict a smooth rise in heavy‐element abundance (metallicity) with time. We test this prediction with a new, large and unbiased sample of long‐lived stars in the solar neighbourhood and find that several of the key tests fail to support the classical predictions.
openaire   +2 more sources

Milky Way evolution on a human timescale

How do galaxies form and evolve? This is one of the most puzzling questions in astronomy. Galaxy assembly takes place throughout the entire history of the Universe, but our understanding of it is hampered by the unfortunate fact that we can only observe galaxies at a single moment in time.
Eugene, Neige
openaire   +1 more source

Unveiling the time evolution of chemical abundances across the Milky Way disc with APOGEE

Monthly Notices of the Royal Astronomical Society, 2023
B Ratcliffe, Ivan Minchev, Tobias Buck   +2 more
exaly