Results 41 to 50 of about 83,866 (252)
The Stellar Ages of Elliptical Galaxies [PDF]
Astrophysics and Space Science, 1995 Integrated broad-band colors and metallic lines cannot discriminate clearly between the effects of age and Z in old stellar populations. Such data are more sensitive to Z than to age. The Hβ feature provides a way to break this degeneracy. New measurements indicate that the mean stellar ages of typical E galaxy nuclei are fairly young, ranging from 2 ...
Faber, S. M. +3 more
openaire +3 more sources
A Dynamic Galaxy: Stellar Age Patterns across the Disk of M101
The Astrophysical JournalUsing deep, narrowband imaging of the nearby spiral galaxy M101, we present stellar age information across the full extent of the disk of M101. Our narrowband filters measure age-sensitive absorption features such as the Balmer lines and the slope of the
Ray Garner III +3 more
doaj +1 more source
Stellar Archeology: What White Dwarf Stars Tell Us About the History of the Galaxy [PDF]
Journal of Astronomy and Space Sciences, 2012 White dwarf stars have played important roles in rather diverse areas of astrophysics. This paper outlines how these stellar remnants, especially those in widely separated “fragile” binaries, have provided unique leverage on difficult astrophysical ...
Terry D. Oswalt
doaj +1 more source
Filamentary Star Formation in NGC 1275 [PDF]
, 2014 We examine the star formation in the outer halo of NGC~1275, the central galaxy in the Perseus cluster (Abell 426), using far ultraviolet and optical images obtained with the Hubble Space Telescope.
Canning, R. E. A +10 more
core +2 more sources
Globular clusters, Hipparcos, and the age of the galaxy [PDF]
Proceedings of the National Academy of Sciences, 1998 We discuss the impact of the results from the recent Hipparcos astrometric satellite on distance estimates of galactic globular clusters. Recalibrating the clusters not only implies a relatively small change in the distance to the Large Magellanic Cloud, and hence a rescaling of several estimates of the Hubble constant, but also leads to ...
openaire +3 more sources
A relationship between stellar metallicity gradients and galaxy age in dwarf galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT We explore the origin of stellar metallicity gradients in simulated and observed dwarf galaxies. We use FIRE-2 cosmological baryonic zoom-in simulations of 26 isolated galaxies as well as existing observational data for 10 Local Group dwarf galaxies. Our simulated galaxies have stellar masses between 105.5 and 108.6 M⊙.
Francisco J Mercado +10 more
openaire +4 more sources
Advanced Science, EarlyView.Producing MSCs on rigid culture substrates induces a scar‐making phenotype, jeapordizing therapeutic success. ‘Tissue‐soft’ surfaces prevent MSC fibrogenesis and preserve regenerative traits. An epigenetic network, driven by HOXA11 and SALL1, maintains ‘soft memory’ by keeping chromatin open in relaxed MSCs, promoting anti‐fibrotic programs.
Fereshteh Sadat Younesi +7 more
wiley +1 more source
The Astrophysical JournalReconstructing the mass assembly history of the Milky Way relies on obtaining detailed measurements of the properties of many stars in the galaxy, especially in the stellar halo.
Danny Horta +4 more
doaj +1 more source
Inferring More from Less: Prospector as a Photometric Redshift Engine in the Era of JWST
The Astrophysical Journal Letters, 2023 The advent of the James Webb Space Telescope (JWST) signals a new era in exploring galaxies in the high- z universe. Current and upcoming JWST imaging will potentially detect galaxies at z ∼ 20, creating a new urgency in the quest to infer accurate ...
Bingjie Wang +8 more
doaj +1 more source
The oldest stars of the bulge: new information on the ancient Galaxy
, 2017 Recently the search for the oldest stars have started to focus on the Bulge region. The Galactic bulge hosts extremely old stars, with ages compatible with the ages of the oldest halo stars.
Cescutti, Gabriele +2 more
core +1 more source