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Assessing the sources of reionization: a spectroscopic case study of a 30× lensed galaxy at z 5 with Lyα, C IV, Mg II, and [Ne III]
Richard, Johan; Maiolino, Roberto; Massey, Richard +5 more
We present a detailed spectroscopic analysis of a galaxy at z ≃ 4.88 that is, by chance, magnified ~30× by gravitational lensing. Only three sources at z ≳ 5 are known with such high magnification. This particular source has been shown to exhibit widespread, high equivalent width ${{\rm C\, \small {IV}}}\ \lambda 1549\, \mathring{\rm A}$ emission,…
Strong toroidal magnetic fields required by quiescent X-ray emission of magnetars
Igoshev, Andrei P.; Hollerbach, Rainer; Wood, Toby +1 more
Magnetars are neutron stars (NSs) with extreme magnetic fields1 of strength 5 × 1013-1015 G. These fields are generated by dynamo action during the proto-NS phase, and are expected to have both poloidal and toroidal components2-6, although the energy of the toroidal component could be ten times larger
A Massive Quiescent Galaxy Confirmed in a Protocluster at z = 3.09
Tamura, Yoichi; Kohno, Kotaro; Steidel, Charles C. +10 more
We report a massive quiescent galaxy at ${z}_{\mathrm{spec}}={3.0922}_{-0.004}^{+0.008}$ spectroscopically confirmed at a protocluster in the SSA22 field by detecting the Balmer and Ca II absorption features with the multi-object spectrometer for infrared exploration on the Keck I telescope. This is the most distant quiescent galaxy confirmed in a…
Chamaeleon DANCe. Revisiting the stellar populations of Chamaeleon I and Chamaeleon II with Gaia-DR2 data
Bertin, E.; Miret-Roig, N.; Bouy, H. +6 more
Context. Chamaeleon is the southernmost low-mass star-forming complex within 200 pc from the Sun. Its stellar population has been extensively studied in the past, but the current census of the stellar content is not complete yet and deserves further investigation.
Aims: We take advantage of the second data release of the Gaia space mission to…
Constraining the solar neighbourhood age-metallicity relation from white dwarf-main sequence binaries
Gänsicke, B. T.; Tremblay, P. -E.; Koester, D. +11 more
The age-metallicity relation (AMR) is a fundamental tool for constraining the chemical evolution of the Galactic disc. In this work, we analyse the observational properties of this relation using binary stars that have not interacted consisting of a white dwarf (WD) - from which we can derive the total age of the system - and a main sequence (MS) …
Dependence of dark matter - electron scattering on the galactic dark matter velocity distribution
Radick, Aria; Taki, Anna-Maria; Yu, Tien-Tien
The rate of dark matter-electron scattering depends on the underlying velocity distribution of the dark matter halo. Importantly, dark matter-electron scattering is particularly sensitive to the high-velocity tail, which differs significantly amongst the various dark matter halo models. In this work, we summarize the leading halo models and discus…
An ultra-short-period transiting super-Earth orbiting the M3 dwarf TOI-1685
Tamura, M.; Amado, P. J.; Caballero, J. A. +51 more
Dynamical histories of planetary systems, as well as the atmospheric evolution of highly irradiated planets, can be studied by characterizing the ultra-short-period planet population, which the TESS mission is particularly well suited to discover. Here, we report on the follow-up of a transit signal detected in the TESS sector 19 photometric time …
Classical Cepheids in the Milky Way
Soszyński, I.; Udalski, A.; Pietrukowicz, P.
We share the most up-to-date, carefully verified list of classical Cepheids residing in the Galaxy. Based on long-term OGLE experience in the field of variable stars, we have inspected candidates for Cepheids from surveys such as ASAS, ASAS-SN, ATLAS, Gaia, NSVS, VVV, WISE, ZTF, among others, and also known sources from the General Catalogue of Va…
An ALMA study of hub-filament systems - I. On the clump mass concentration within the most massive cores
Peretto, Nicolas; Ragan, Sarah E.; Traficante, Alessio +7 more
The physical processes behind the transfer of mass from parsec-scale clumps to massive star-forming cores remain elusive. We investigate the relation between the clump morphology and the mass fraction that ends up in its most massive core (MMC) as a function of infrared brightness, i.e. a clump evolutionary tracer. Using Atacama Large Millimeter/s…
A Duality in the Origin of Bulges and Spheroidal Galaxies
Pérez-González, Pablo G.; Costantin, Luca; Koekemoer, Anton M. +11 more
Studying the resolved stellar populations of the different structural components that build massive galaxies directly unveils their assembly history. We aim at characterizing the stellar population properties of a representative sample of bulges and pure spheroids in massive galaxies (M⋆ > 1010 M⊙) in the GOODS-…