Results 81 to 90 of about 92,502 (190)

The Milky Way and other spiral galaxies

EPJ Web of Conferences, 2012
Cosmologists have often considered the Milky Way as a typical spiral galaxy, and its properties have considerably influenced the current scheme of galaxy formation.
Wang J.L., Yang Y.B., Flores H., Puech M., Hammer F., Fouquet S.   +5 more
doaj   +1 more source

The Dichotomy of the Halo of the Milky Way

, 2008
We summarize evidence that the halo of the Milky Way comprises two different, and broadly overlapping, stellar components. The two structures exhibit different chemical compositions, spatial distributions, and kinematics.
Akira Ohnishi, Daniela Carollo, Kiyoshi Kato, Masayuki Y. Fujimoto, Shigeru Kubono, Takaya Nozawa, Takuma Suda, Timothy C. Beers, Toshitaka Kajino   +8 more
core   +1 more source

Structural Analogs of the Milky Way Galaxy: Stellar Populations in the Boxy Bulges of NGC 4565 and NGC 5746

, 2019
We present NGC 4565 and NGC 5746 as structural analogs of our Milky Way. All three are giant, SBb - SBbc galaxies with two pseudobulges, i. e., a compact, disky, star-forming pseudobulge embedded in a vertically thick, "red and dead", boxy pseudobulge ...
Bender, Ralf, Kormendy, John
core   +1 more source

The epoch of bar formation in the Milky Way

, 2023
A key event in the life of the Milky Way is the formation of the bar. The Milky Way bar has restructured the disc, been slowed by the dark matter halo and funnelled gas towards the Galactic Centre. It is then important to know the period of time over which these processes have been effective.
openaire   +2 more sources

The Extremely Metal-rich Knot of Stars at the Heart of the Galaxy

The Astrophysical Journal
We show with Gaia XP spectroscopy that extremely metal-rich (EMR) stars in the Milky Way ([M/H] _XP ≳ 0.5) are largely confined to a tight “knot” at the center of the Galaxy. This EMR knot is round in projection, has a fairly abrupt edge near R _GC,proj ∼
Hans-Walter Rix, Vedant Chandra, Gail Zasowski, Annalisa Pillepich, Sergey Khoperskov, Sofia Feltzing, Rosemary F. G. Wyse, Neige Frankel, Danny Horta, Juna Kollmeier, Keivan Stassun, Melissa K. Ness, Jonathan C. Bird, David Nidever, José G. Fernández-Trincado, João A. S. Amarante, Chervin F. P. Laporte, Jianhui Lian   +17 more
doaj   +1 more source

What Is Missing from the Local Stellar Halo?

The Astrophysical Journal
The Milky Way’s stellar halo, which extends to >100 kpc, encodes the evolutionary history of our Galaxy. However, most studies of the halo to date have been limited to within a few kiloparsecs of the Sun.
Katherine Sharpe, Rohan P. Naidu, Charlie Conroy   +2 more
doaj   +1 more source

Using frequency maps to constrain the distribution function of the Milky Way stellar halo

, 2011
Resolved surveys of the Milky Way's stellar halo can obtain all 6 phase space coordinates of tens of thousands of individual stars, making it possible to compute their 3-dimensional orbits. Spectral analysis of large numbers of halo orbits can be used to
Valluri, Monica
core   +2 more sources

Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VIII. Mapping the Kinematics of the Galactic Disk Using Mono-age and Mono-abundance Stellar Populations

The Astrophysical Journal
We present a comprehensive study of the kinematic properties of the different Galactic disk populations, as defined by the chemical abundance ratios and stellar ages, across a large disk volume (4.5 ≤ R ≤ 15.0 kpc and ∣ Z ∣ ≤ 3.0 kpc), by using the ...
Weixiang Sun, Yang Huang, Han Shen, Chun Wang, Huawei Zhang, Zhijia Tian, Xiaowei Liu, Biwei Jiang   +7 more
doaj   +1 more source

Accurate, Precise, and Physically Self-consistent Ages and Metallicities for 400,000 Solar Neighborhood Subgiant Branch Stars

The Astrophysical Journal
Age is the most difficult fundamental stellar parameter to infer for isolated stars. While isochrone-based ages are in general imprecise for both main-sequence dwarfs and red giants, precise isochrone-based ages can be obtained for stars on the subgiant ...
David M. Nataf, Kevin C. Schlaufman, Henrique Reggiani, Isabel Hahn   +3 more
doaj   +1 more source

Are dSph galaxies Galactic building blocks?

EPJ Web of Conferences, 2012
Dwarf spheroidal galaxies (dSph) are frequently assumed to represent surviving examples of a vast now destroyed population of small systems in which many of the stars now forming the Milky Way were formed. Ongoing accretion and considerable sub-structure
Gilmore G., Asiri H.M.
doaj   +1 more source