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The star formation rate history of the Milky Way is derived using the chromospheric age distribution for 552 stars in the solar neighborhood. The stars sample birthsites distributed over a very large range of distances because of orbital…

Astrophysics · Physics 2009-10-31 Helio J. Rocha-Pinto , John Scalo , Walter Maciel , Chris Flynn

A chromospheric age distribution of 552 late-type dwarfs is transformed into a star formation history by the application of scale height corrections, stellar evolutionary corrections and volume corrections. We show that the disk of our…

Astrophysics · Physics 2007-05-23 H. J. Rocha-Pinto , John Scalo , W. J. Maciel , Chris Flynn

[Abridged] We map the stellar age distribution ($\lesssim 1$ Gyr) across a 6kpc$\,\times\,$6kpc area of the Galactic disc to constrain our Galaxy's recent star-formation history. Our modelling draws on the sample of Zari et al. (2021) that…

Astrophysics of Galaxies · Physics 2022-12-21 E. Zari , N. Frankel , H. -W. Rix

The nuclear disc is a dense stellar structure at the centre of the Milky Way, with a radius of $\sim$150 pc. It has been a place of intense star formation in the past several tens of millions of years but its overall formation history has…

We use a new method to trace backwards the star formation history of the Milky Way disk, using a sample of M dwarfs in the solar neighbourhood which is representative for the entire solar circle. M stars are used because they show H_alpha…

Astrophysics · Physics 2009-11-13 B. Fuchs , H. Jahreiss , C. Flynn

Quantification of the Galaxy's star formation history involves both the duration and the rate of formation, with these parameters being known with different precision for different populations. The early rate of star formation is knowable…

Astrophysics · Physics 2007-05-23 Gerry Gilmore

We report the first robust measurement of the Milky Way star formation history using the imprint left on chemical abundances of long-lived stars. The formation of the Galactic thick disc occurs during an intense star formation phase between…

Astrophysics of Galaxies · Physics 2015-06-18 Owain N. Snaith , Misha Haywood , Paola Di Matteo , Matthew D. Lehnert , Francoise Combes , David Katz , Ana Gomez

The formation of our Milky Way can be parsed qualitatively into different phases that resulted in its structurally different stellar populations: the halo and the disk components. Revealing a quantitative overall picture of the Galactic…

Astrophysics of Galaxies · Physics 2022-03-24 Maosheng Xiang , Hans-Walter Rix

(abridged) We provide Ks photometry for roughly 39,000 stars and H-band photometry for about 11,000 stars within a field of about 40"x40", centred on Sgr A*. In addition, we provide Ks photometry of about 3,000 stars in a very deep central…

Astrophysics of Galaxies · Physics 2020-09-16 R. Schödel , F. Nogueras-Lara , E. Gallego-Cano , B. Shahzamanian , A. T. Gallego-Calvente , A. Gardini

Hierarchical star formation leads to a progressive decrease in the clustering of star clusters both in terms of spatial scale and age. Consistently, the statistical analysis of positions and ages of clusters in the Milky Way disk strongly…

Astrophysics of Galaxies · Physics 2009-07-22 R. de la Fuente Marcos , C. de la Fuente Marcos

We develop a chemical evolution model in order to study the star formation history of the Milky Way. Our model assumes that the Milky Way is formed from a closed box-like system in the inner regions, while the outer parts of the disc…

Astrophysics of Galaxies · Physics 2015-06-10 O. Snaith , M. Haywood , P. Di Matteo , M. D. Lehnert , F. Combes , D. Katz , A. Gómez

I review observational studies of the large-scale star formation process in nearby galaxies. A wealth of new multi-wavelength data provide an unprecedented view on the interplay of the interstellar medium and (young) stellar populations on…

Astrophysics of Galaxies · Physics 2015-06-11 Andreas Schruba

We investigate thin and thick stellar disc formation in Milky-Way-mass galaxies using twelve FIRE-2 cosmological zoom-in simulations. All simulated galaxies experience an early period of bursty star formation that transitions to a late-time…

We provide a detailed map of the ages and metallicities of turnoff stars in the Milky Way disc based on data from GALAH DR3 and Gaia EDR3. From this map, we identify previously undetected features in the age-metallicity distribution of disc…

Astrophysics of Galaxies · Physics 2022-01-05 Christian L. Sahlholdt , Sofia Feltzing , Diane K. Feuillet

We investigate the chemical evolution of the Milky Way disc exploring various schemes of recent (last several Gyr) star formation episodes, as reported in recent observational works. We use a semi-analytical model with parametrized radial…

Astrophysics of Galaxies · Physics 2025-02-12 Tianxiang Chen , Nikos Prantzos

We present spatially resolved imaging and integral field spectroscopy data for 450 cool giant stars within 1\,pc from Sgr\,A*. We use the prominent CO bandheads to derive effective temperatures of individual giants. Additionally we present…

Astrophysics of Galaxies · Physics 2015-05-30 O. Pfuhl , T. K. Fritz , M. Zilka , H. Maness , F. Eisenhauer , R. Genzel , S. Gillessen , T. Ott , K. Dodds-Eden , A. Sternberg

The prevailing model of galaxy formation proposes that galaxies like the Milky Way are built through a series of mergers with smaller galaxies over time. However, the exact details of the Milky Way's assembly history remain uncertain. In…

Astrophysics of Galaxies · Physics 2024-12-18 Lekshmi Thulasidharan , Elena D'Onghia , Robert Benjamin , Ronald Drimmel , Eloisa Poggio , Anna Queiroz

The age distribution of the open cluster system is a key piece of information to decipher the star formation history of the Milky Way disk. Recently, a remarkable earlier drop of its older end was found, which caught our attention.…

Astrophysics of Galaxies · Physics 2023-07-18 Andrés E. Piatti

The star formation history of the northern and southern M31 disk is measured using samples of BV photometry for 4' X 4' regions taken from the KPNO/CTIO Local Group Survey (Massey et al. 2001). The distances, mean reddening values, and age…

Astrophysics · Physics 2009-11-07 Benjamin F. Williams

We use 297 042 main sequence turn-off stars selected from the LSS-GAC to determine the radial and vertical gradients of stellar metallicity of the Galactic disk in the anti-center direction. We determine ages of those turn-off stars by…

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