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DESI Early Data Release Milky Way Survey value-added catalogue
Moustakas, J.; Brooks, D.; Li, T. S. +40 more
We present the stellar value-added catalogue based on the Dark Energy Spectroscopic Instrument (DESI) Early Data Release. The catalogue contains radial velocity and stellar parameter measurements for $\simeq$ 400 000 unique stars observed during commissioning and survey validation by DESI. These observations were made under conditions similar to t…
Ly α emission in low-redshift most metal-deficient compact star-forming galaxies
Schaerer, D.; Thuan, T. X.; Izotov, Y. I. +3 more
We present observations with the Cosmic Origins Spectrograph onboard the Hubble Space Telescope of nine most metal-deficient compact star-forming galaxies with oxygen abundances 12 + log(O/H) = 6.97-7.23, redshifts z = 0.02811-0.13320, and stellar masses M⋆ ≤ 107 M⊙. We aim to study the properties of Ly α emission …
A critical review of recent Gaia wide binary gravity tests
Hernandez, X.; Chae, Kyu-Hyun; Aguayo-Ortiz, A.
Over the last couple of years, the appearance of the third data release from the Gaia satellite has triggered various wide binary low acceleration gravity tests. Wide binaries with typical total masses $\approx 1.0 - 1.6\,\mathrm{ M}_{\odot }$ and separations above a few thousand au probe the low acceleration $a \lesssim a_{0}$ regime, where at ga…
Cloud-by-cloud multiphase investigation of the circumgalactic medium of low-redshift galaxies
Richter, Philipp; Charlton, Jane C.; Kacprzak, Glenn G. +10 more
The pervasive presence of warm gas in galaxy haloes suggests that the circumgalactic medium (CGM) is multiphase in its ionization structure and complex in its kinematics. Some recent state-of-the-art cosmological galaxy simulations predict an azimuthal dependence of CGM metallicities. We investigate the presence of such a trend by analysing the di…
The Type I superluminous supernova catalogue I: light-curve properties, models, and catalogue description
Rest, Armin; Villar, V. Ashley; Eftekhari, Tarraneh +25 more
We present the most comprehensive catalogue to date of Type I superluminous supernovae (SLSNe), a class of stripped-envelope supernovae (SNe) characterized by exceptionally high luminosities. We have compiled a sample of 262 SLSNe reported through 2022 December 31. We verified the spectroscopic classification of each SLSN and collated an exhaustiv…
JWST observations of the Ring Nebula (NGC 6720): I. Imaging of the rings, globules, and arcs
Matsuura, Mikako; Volk, Kevin; Cami, Jan +18 more
We present JWST images of the well-known planetary nebula NGC 6720 (the Ring Nebula), covering wavelengths from 1.6 to 25 $\, \mu$m. The bright shell is strongly fragmented with some 20 000 dense globules, bright in H2, with a characteristic diameter of 0.2 arcsec and density nH ~ 105-106 cm-3…
Data reconstruction of the dynamical connection function in f(Q) cosmology
Ren, Xin; Wang, Bo; Cai, Yi-Fu +2 more
We employ Hubble data and Gaussian Processes in order to reconstruct the dynamical connection function in $f(Q)$ cosmology beyond the coincident gauge. In particular, there exist three branches of connections that satisfy the torsionless and curvatureless conditions, parametrized by a new dynamical function $\gamma$. We express the redshift depend…
Kinematics and dynamics of the Galactic bar revealed by Gaia long-period variables
Belokurov, Vasily; Zhang, Hanyuan; Evans, N. Wyn +2 more
We use low-amplitude long period variable (LA-LPV) candidates in Gaia DR3 to trace the kinematics and dynamics of the Milky Way bar. LA-LPVs, like other LPVs, are intrinsically bright and follow a tight period-luminosity relation, but unlike e.g. Mira variables, their radial velocity measurements are reliable due to their smaller pulsation amplitu…
Probing the early Milky Way with GHOST spectra of an extremely metal-poor star in the Galactic disc
Simpson, Chris; Placco, Vinicius M.; Hayes, Christian R. +31 more
Pristine_183.6849 + 04.8619 (P1836849) is an extremely metal-poor ([Fe/H] = -3.3 ± 0.1) star on a prograde orbit confined to the Galactic disc. Such stars are rare and may have their origins in protogalactic fragments that formed the early Milky Way, in low-mass satellites accreted later, or forming in situ in the Galactic plane. Here, we present …
JWST lensed quasar dark matter survey - I. Description and first results
Djorgovski, S. G.; Stern, D.; Treu, T. +18 more
The flux ratios of gravitationally lensed quasars provide a powerful probe of the nature of dark matter. Importantly, these ratios are sensitive to small-scale structure, irrespective of the presence of baryons. This sensitivity may allow us to study the halo mass function even below the scales where galaxies form observable stars. For accurate me…