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13 papers · 2 filters
Differential abundances of open clusters and their tidal tails: chemical tagging and chemical homogeneity
L. Casamiquela, Y. Tarricq, C. Soubiran +4
Well studied Open Clusters (OCs) in the Solar neighbourhood are used as reference objects to test galactic and stellar theories. For that purpose their chemical composition needs t…
The GALAH Survey: Chemically tagging the Fimbulthul stream to the globular cluster Centauri
Jeffrey D. Simpson, Sarah L. Martell, Gary Da Costa +17
Using kinematics from Gaia and the large elemental abundance space of the second data release of the GALAH survey, we identify two new members of the Fimbulthul stellar stream, and…
Balmer breaks in simulated galaxies at z>6
C. Binggeli, E. Zackrisson, X. Ma +6
Photometric observations of the spectroscopically confirmed galaxy MACS1149-JD1 have indicated the presence of a prominent Balmer break in its spectral energy distri…
Spatial variations in the Milky Way disc metallicity-age relation
Diane K. Feuillet, Neige Frankel, Karin Lind +5
Stellar ages are a crucial component to studying the evolution of the Milky Way. Using Gaia DR2 distance estimates, it is now possible to estimate stellar ages for a larger volume…
The Gaia-ESO survey: Calibrating a relationship between Age and the [C/N] abundance ratio with open clusters
G. Casali, L. Magrini, E. Tognelli +51
In the era of large high-resolution spectroscopic surveys, high-quality spectra can contribute to our understanding of the Galactic chemical evolution, providing chemical abundance…
Magnification, dust and time-delay constraints from the first resolved strongly lensed Type Ia supernova
S. Dhawan, J. Johansson, A. Goobar +14
We report lensing magnifications, extinction, and time-delay estimates for the first resolved, multiply-imaged Type Ia supernova iPTF16geu, at , using $Hubble\,Space\,Te…
Bubble mapping with the Square Kilometer Array -- I. Detecting galaxies with Euclid, JWST, WFIRST and ELT within ionized bubbles in the intergalactic medium at z>6
Erik Zackrisson, Suman Majumdar, Rajesh Mondal +16
The Square Kilometer Array is expected to provide the first tomographic observations of the neutral intergalactic medium at redshifts z>6 and pinpoint the locations of individual i…
The K2-HERMES Survey: Age and Metallicity of the Thick Disc
Sanjib Sharma, Dennis Stello, Joss Bland-Hawthorn +34
Asteroseismology is a promising tool to study Galactic structure and evolution because it can probe the ages of stars. Earlier attempts comparing seismic data from the {\it Kepler}…
On the Detection of Supermassive Primordial Stars. II. Blue Supergiants
Marco Surace, Erik Zackrisson, Daniel J. Whalen +4
Supermassive primordial stars in hot, atomically-cooling haloes at 15 - 20 may have given birth to the first quasars in the universe. Most simulations of these rapidly acc…
4MOST Consortium Survey 4: Milky Way Disc and Bulge High-Resolution Survey (4MIDABLE-HR)
T. Bensby, M. Bergemann, J. Rybizki +21
The signatures of the formation and evolution of a galaxy are imprinted in its stars. Their velocities, ages, and chemical compositions present major constraints on models of galax…
Challenges in modelling the rest-frame ultraviolet/optical spectra of galaxies at the high-redshift frontier
Erik Zackrisson, Anton Vikaeus
New challenges in the modelling of galaxy spectra are bound to emerge as upcoming telescopes like the James Webb Space Telescope will allow us to detect galaxies at fainter flux le…
The impact of Stellar feedback from velocity-dependent ionised gas maps. -- A MUSE view of Haro 11
V. Menacho, G. Östlin, A. Bik +6
We have used the capability of the MUSE instrument to explore the impact of stellar feedback at large scales in Haro 11, a galaxy under extreme starburst condition and one of the f…
Identifying reionization-epoch galaxies with extreme levels of Lyman continuum leakage in James Webb Space Telescope surveys
Sambit K. Giri, Erik Zackrisson, Christian Binggeli +2
The James Webb Space Telescope (JWST) NIRSpec instrument will allow rest-frame ultraviolet/optical spectroscopy of galaxies in the epoch of reionization (EoR). Some galaxies may ex…