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The GALAH Survey: dependence of elemental abundances on age and metallicity for stars in the Galactic disc
Lewis, Geraint F.; Buder, Sven; Lind, Karin +25 more
Using data from the GALAH survey, we explore the dependence of elemental abundances on stellar age and metallicity among Galactic disc stars. We find that the abundance of most elements can be predicted from age and [Fe/H] with an intrinsic scatter of about 0.03 dex. We discuss the possible causes for the existence of the abundance-age-metallicity…
Reconstructing the Assembly of Massive Galaxies. I. The Importance of the Progenitor Effect in the Observed Properties of Quiescent Galaxies at z ≈ 2
Giavalisco, Mauro; Ji, Zhiyuan
We study the relationship between the morphology and star formation history (SFH) of 361 quiescent galaxies (QGs) at redshift <z obs> ≈ 2, with stellar mass $\mathrm{log}{M}_{* }\geqslant 10.3$ , selected with the UVJ technique. Taking advantage of panchromatic photometry covering the rest-frame UV-to-NIR spectral range ( ≈40 band…
The Villafranca catalog of Galactic OB groups. II. From Gaia DR2 to EDR3 and ten new systems with O stars
Maíz Apellániz, J.; Alfaro, E. J.; Barbá, R. H. +4 more
Context. This is the second paper of a series on Galactic OB groups that uses astrometric and photometric data from Gaia and spectral classifications from the Galactic O-Star Spectroscopic Survey (GOSSS) and the Library of Libraries of Massive-star high-Resolution spectra (LiLiMaRlin). The previous paper was based on the second Gaia data release (…
Estimate of the carbon footprint of astronomical research infrastructures
Hughes, Annie; Martin, Pierrick; Knödlseder, Jürgen +4 more
The carbon footprint of astronomical research is an increasingly topical issue with first estimates of research institute and national community footprints having recently been published. As these assessments have typically excluded the contribution of astronomical research infrastructures, we complement these studies by providing an estimate of t…
Intracluster Magnetic Filaments and an Encounter with a Radio Jet
Brunetti, G.; Forman, W.; Jones, T. W. +6 more
Thin synchrotron-emitting filaments are increasingly seen in the intracluster medium (ICM). We present the first example of a direct interaction between a magnetic filament, a radio jet, and a dense ICM clump in the poor cluster A194. This enables the first exploration of the dynamics and possible histories of magnetic fields and cosmic rays in su…
BASS XXXII: Studying the Nuclear Millimeter-wave Continuum Emission of AGNs with ALMA at Scales ≲100-200 pc
Baba, Shunsuke; Imanishi, Masatoshi; Ueda, Yoshihiro +25 more
To understand the origin of nuclear (≲100 pc) millimeter-wave (mm-wave) continuum emission in active galactic nuclei (AGNs), we systematically analyzed subarcsecond resolution Band-6 (211-275 GHz) Atacama Large Millimeter/submillimeter Array data of 98 nearby AGNs (z < 0.05) from the 70 month Swift/BAT catalog. The sample, almost unbiased for o…
VIA MACHINAE: Searching for stellar streams using unsupervised machine learning
Buckley, Matthew R.; Shih, David; Necib, Lina +1 more
We develop a new machine learning algorithm, VIA MACHINAE, to identify cold stellar streams in data from the Gaia telescope. VIA MACHINAE is based on ANODE, a general method that uses conditional density estimation and sideband interpolation to detect local overdensities in the data in a model agnostic way. By applying ANODE to the positions, prop…
ALMA Observations of NGC 6334S. II. Subsonic and Transonic Narrow Filaments in a High-mass Star Formation Cloud
Sanhueza, Patricio; Smith, Howard A.; Qiu, Keping +21 more
We present a study of narrow filaments toward a massive infrared dark cloud, NGC 6334S, using the Atacama Large Millimeter/submillimeter Array. Thirteen gas filaments are identified using the H13CO+ line, while a single continuum filament is revealed by the continuum emission. The filaments present a compact radial distributi…
Chemo-kinematics of the Milky Way spiral arms and bar resonances: Connection to ridges and moving groups in the solar vicinity
Gerhard, Ortwin; Khoperskov, Sergey
Making use of a new high-resolution spiral galaxy simulation as well as Gaia DR2 and EDR3 data complemented by chemical abundances from the Galah DR3, APOGEE DR16, and LAMOST DR5 surveys, we explore the possible link between the Milky Way (MW) spiral arms, (R, vϕ) ridges, and moving groups in local vR-vϕ space. We …
Close detached white dwarf + brown dwarf binaries: further evidence for low values of the common envelope efficiency
Zorotovic, Monica; Schreiber, MatthiasR
Common envelope evolution is a fundamental ingredient in our understanding of the formation of close binary stars containing compact objects that include the progenitors of type Ia supernovae, short gamma-ray bursts, and most stellar gravitational wave sources. To predict the outcome of common envelope evolution, we still rely to a large degree on…