Search Publications
Final Targeting Strategy for the SDSS-IV APOGEE-2S Survey
Monachesi, Antonela; Drout, Maria R.; Kollmeier, Juna A. +43 more
APOGEE is a high-resolution (R ~ 22,000), near-infrared, multi-epoch, spectroscopic survey of the Milky Way. The second generation of the APOGEE project, APOGEE-2, includes an expansion of the survey to the Southern Hemisphere called APOGEE-2S. This expansion enabled APOGEE to perform a fully panoramic mapping of all of the main regions of the Mil…
The mass of the Milky Way out to 100 kpc using halo stars
Zhao, Gang; Grand, Robert J. J.; Gómez, Facundo A. +9 more
We use a distribution function analysis to estimate the mass of the Milky Way (MW) out to 100 kpc using a large sample of halo stars. These stars are compiled from the literature, and the vast majority ( ${\sim } 98{{\ \rm per\ cent}}$ ) have 6D phase-space information. We pay particular attention to systematic effects, such as the dynamical influ…
Exploiting the Gaia EDR3 photometry to derive stellar temperatures
Massari, D.; Bellazzini, M.; Mucciarelli, A.
We present new colour-effective temperature (Teff) transformations based on the photometry of the early third data release (EDR3) of the ESA/Gaia mission. These relations are calibrated on a sample of about 600 dwarf and giant stars for which Teff has previously been determined with the infrared flux method from dereddened co…
The MUSE Extremely Deep Field: The cosmic web in emission at high redshift
Feltre, A.; Roth, M.; Steinmetz, M. +29 more
We report the discovery of diffuse extended Lyα emission from redshift 3.1 to 4.5, tracing cosmic web filaments on scales of 2.5−4 cMpc. These structures have been observed in overdensities of Lyα emitters in the MUSE Extremely Deep Field, a 140 h deep MUSE observation located in the Hubble Ultra-Deep Field. Among the 22 overdense regions identifi…
MMT spectroscopy of Lyman-alpha at z ≃ 7: evidence for accelerated reionization around massive galaxies
Charlot, Stéphane; Chevallard, Jacopo; Bouwens, Rychard J. +4 more
Reionization-era galaxies tend to exhibit weak Ly α emission, likely reflecting attenuation from an increasingly neutral IGM. Recent observations have begun to reveal exceptions to this picture, with strong Ly α emission now known in four of the most massive z = 7-9 galaxies in the CANDELS fields, all of which also exhibit intense [O III]+H β emis…
Dynamical dark energy after Planck CMB final release and H0 tension
Di Valentino, Eleonora; Yang, Weiqiang; Wu, Yabo +2 more
In this article we compare a variety of well-known dynamical dark energy models using the cosmic microwave background measurements from the 2018 Planck legacy and 2015 Planck data releases, the baryon acoustic oscillations measurements and the local measurements of H0 obtained by the SH0ES (Supernovae, H0, for the Equation of…
Weighing stars from birth to death: mass determination methods across the HRD
Feuillet, Diane K.; Girardi, Léo; Stassun, Keivan G. +31 more
The mass of a star is the most fundamental parameter for its structure, evolution, and final fate. It is particularly important for any kind of stellar archaeology and characterization of exoplanets. There exist a variety of methods in astronomy to estimate or determine it. In this review we present a significant number of such methods, beginning …
Time-resolved spectroscopy and photometry of M dwarf flare star YZ Canis Minoris with OISTER and TESS: Blue asymmetry in the Hα line during the non-white light flare
Notsu, Yuta; Kowalski, Adam F.; Maehara, Hiroyuki +15 more
In this paper, we present the results from spectroscopic and photometric observations of the M-type flare star YZ CMi in the framework of the Optical and Infrared Synergetic Telescopes for Education and Research (OISTER) collaborations during the Transiting Exoplanet Survey Satellite (TESS) observation period. We detected 145 white-light flares fr…
Infrared observations of the flaring maser source G358.93-0.03. SOFIA confirms an accretion burst from a massive young stellar object
Menten, K. M.; Eislöffel, J.; Klose, S. +24 more
Context. Class II methanol masers are signposts of massive young stellar objects (MYSOs). Recent evidence shows that flares of these masers are driven by MYSO accretion bursts. Thus, maser monitoring can be used to identify such bursts which are hard to discover otherwise. Infrared observations reveal burst-induced changes in the spectral energy d…
Stellar migration and chemical enrichment in the milky way disc: a hybrid model
Quinn, Thomas R.; Weinberg, David H.; Christensen, Charlotte R. +6 more
We develop a hybrid model of galactic chemical evolution that combines a multiring computation of chemical enrichment with a prescription for stellar migration and the vertical distribution of stellar populations informed by a cosmological hydrodynamic disc galaxy simulation. Our fiducial model adopts empirically motivated forms of the star format…