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Low Star Formation Activity and Low Gas Content of Quiescent Galaxies at z = 3.5-4.0 Constrained with ALMA
Papovich, Casey; Kacprzak, Glenn G.; Glazebrook, Karl +10 more
The discovery in deep near-infrared surveys of a population of massive quiescent galaxies at z > 3 has given rise to the question of how they came to be quenched so early in the history of the universe. Measuring their molecular gas properties can distinguish between physical processes where they stop forming stars due to a lack of fuel versus …
The Active Chromospheres of Lithium-rich Red Giant Stars
Dupree, Andrea K.; Mahadevan, Suvrath; Terrien, Ryan +17 more
We have gathered near-infrared zyJ-band high-resolution spectra of nearly 300 field red giant stars with known lithium abundances in order to survey their He I λ10830 absorption strengths. This transition is an indicator of chromospheric activity and/or mass loss in red giants. The majority of stars in our sample reside in the red clump or red hor…
Do radio active galactic nuclei reflect X-ray binary spectral states?
Guainazzi, Matteo; Moravec, Emily; Panessa, Francesca +5 more
Context. Over recent years there has been mounting evidence that accreting supermassive black holes in active galactic nuclei (AGNs) and stellar mass black holes have similar observational signatures: thermal emission from the accretion disk, X-ray coronas, and relativistic jets. Further, there have been investigations into whether or not AGNs hav…
Constraining quasar structure using high-frequency microlensing variations and continuum reverberation
Courbin, F.; Sluse, D.; Millon, M. +4 more
Gravitational microlensing is a powerful tool for probing the inner structure of strongly lensed quasars and for constraining parameters of the stellar mass function of lens galaxies. This is achieved by analysing microlensing light curves between the multiple images of strongly lensed quasars and accounting for the effects of three main variable …
H2CS deuteration maps towards the pre-stellar core L1544
Eisenhauer, F.; Fuente, A.; Caselli, P. +7 more
Context. Deuteration is a crucial tool for understanding the complexity of interstellar chemical processes, especially when they involve the interplay of gas-phase and grain-surface chemistry. In the case of multiple deuteration, comparing observation with the results of chemical modelling is particularly effective to study how molecules are inher…
CoBiToM Project - II. Evolution of contact binary systems close to the orbital period cut-off
Hatzidimitriou, D.; Hakala, P.; Liakos, A. +7 more
Ultra-short orbital period contact binaries (Porb < 0.26 d) host some of the smallest and least massive stars. These systems are faint and rare, and it is believed that they have reached a contact configuration after several Gyrs of evolution via angular momentum loss, mass transfer, and mass loss through stellar wind processes. This…
Validation and Improvement of the Pan-STARRS Photometric Calibration with the Stellar Color Regression Method
Yuan, Haibo; Xiao, Kai
As one of the best ground-based photometric data set, Pan-STARRS1 (PS1) has been widely used as the reference to calibrate other surveys. In this work, we present an independent validation and recalibration of the PS1 photometry using spectroscopic data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR7, and photometri…
Compact object candidates with K/M-dwarf companions from LAMOST low-resolution survey
Gu, Wei-Min; Sou, Hao; Yi, Tuan +6 more
Searching for compact objects (black holes, neutron stars, or white dwarfs) in the Milky Way is essential for understanding the stellar evolution history, the physics of compact objects, and the structure of our Galaxy. Compact objects in binaries with a luminous stellar companion are perfect targets for optical observations. Candidate compact obj…
Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves. II. Period-Fourier-Metallicity Relations for First Overtone RR Lyrae
Dall'Ora, Massimo; Bono, Giuseppe; Fiorentino, Giuliana +11 more
We present new period-ϕ 31-[Fe/H] relations for first-overtone RRL stars (RRc), calibrated over a broad range of metallicities (-2.5 ≲ [Fe/H] ≲ 0.0) using the largest currently available set of Galactic halo field RRL with homogeneous spectroscopic metallicities. Our relations are defined in the optical (ASAS-SN V band) and, inaugurally…
The dawn of a new era for dustless HdC stars with Gaia eDR3
Kasliwal, M. M.; Karambelkar, V.; Tisserand, P. +7 more
Context. Decades after their discovery, only four hydrogen-deficient carbon (HdC) stars were known to have no circumstellar dust shell. This is in complete contrast to the ∼130 known Galactic HdC stars that are notorious for being heavy dust producers, that is the R Coronae Borealis (RCB) stars. Together, they form a rare class of supergiant stars…