Search Publications
Characterizing and correcting the proper motion bias of the bright Gaia EDR3 sources
Cantat-Gaudin, Tristan; Brandt, Timothy D.
In this paper, we characterize magnitude-dependent systematics in the proper motions of the Gaia EDR3 catalog and provide a prescription for their removal. The reference frame of bright stars (G ≲ 13) in EDR3 is known to rotate with respect to extragalactic objects, but this rotation has proven difficult to characterize and correct. We employ a sa…
Unveiling the distinct formation pathways of the inner and outer discs of the Milky Way with Bayesian Machine Learning
Davies, Guy R.; Grand, Robert J. J.; Ciucă, Ioana +2 more
We develop a Bayesian Machine Learning framework called BINGO (Bayesian INference for Galactic archaeOlogy) centred around a Bayesian neural network. After being trained on the Apache Point Observatory Galactic Evolution Experiment (APOGEE) and Kepler asteroseismic age data, BINGO is used to obtain precise relative stellar age estimates with uncer…
Homogeneous study of Herbig Ae/Be stars from spectral energy distributions and Gaia EDR3
Montesinos, B.; Mendigutía, I.; Solano, E. +6 more
Context. Herbig Ae/Be stars (HAeBes) have so far been studied based on relatively small samples that are scattered throughout the sky. Their fundamental stellar and circumstellar parameters and statistical properties were derived with heterogeneous approaches before Gaia.
Aims: Our main goal is to contribute to the study of HAeBes from the la…
The ALPINE-ALMA [C II] survey. Luminosity function of serendipitous [C II] line emitters at z ∼ 5
Hathi, Nimish P.; Koekemoer, Anton M.; Jones, Gareth C. +33 more
We present the first [C II] 158 µm luminosity function (LF) at z ∼ 5 from a sample of serendipitous lines detected in the ALMA Large Program to INvestigate [C II] at Early times (ALPINE). A study of the 118 ALPINE pointings revealed several serendipitous lines. Based on their fidelity, we selected 14 lines for the final catalog. According to…
CLEAR: The Gas-phase Metallicity Gradients of Star-forming Galaxies at 0.6 < z < 2.6
Papovich, Casey; Finkelstein, Steven L.; Cleri, Nikko J. +11 more
We report on the gas-phase metallicity gradients of a sample of 238 star-forming galaxies at 0.6 < z < 2.6, measured through deep near-infrared Hubble Space Telescope slitless spectroscopy. The observations include 12 orbit depth Hubble/WFC3 G102 grism spectra taken as a part of the CANDELS Lyα Emission at Reionization (CLEAR) survey, and ar…
Unexpected circular radio objects at high Galactic latitude
Koribalski, Bärbel S.; Norris, Ray P.; Hopkins, Andrew M. +28 more
We have found a class of circular radio objects in the Evolutionary Map of the Universe Pilot Survey, using the Australian Square Kilometre Array Pathfinder telescope. The objects appear in radio images as circular edge-brightened discs, about one arcmin diameter, that are unlike other objects previously reported in the literature. We explore seve…
The Alma catalogue of OB stars - II. A cross-match with Gaia DR2 and an updated map of the solar neighbourhood
Maíz Apellániz, J.; Barbá, R. H.; Pantaleoni González, M. +1 more
We cross-match the Alma catalogue of OB stars with Gaia DR2 astrometry and photometry as a first step towards producing a clean sample of massive stars in the solar neighbourhood with a high degree of completeness. We analyse the resulting colour-absolute magnitude diagram to divide our sample into categories and compare extinction estimates from …
Diving Beneath the Sea of Stellar Activity: Chromatic Radial Velocities of the Young AU Mic Planetary System
Barclay, Thomas; Latham, David W.; Quinn, Samuel N. +52 more
We present updated radial-velocity (RV) analyses of the AU Mic system. AU Mic is a young (22 Myr) early-M dwarf known to host two transiting planets-P b ~ 8.46 days, ${R}_{b}={4.38}_{-0.18}^{+0.18}\ {R}_{\oplus }$ , P c ~ 18.86 days, ${R}_{c}={3.51}_{-0.16}^{+0.16}\ {R}_{\oplus }$ . With visible RVs from Calar Alto high-R…
Evolution of Stellar Feedback in H II Regions
Bolatto, Alberto D.; Reiter, Megan; Lopez, Laura A. +4 more
Stellar feedback is needed to produce realistic giant molecular clouds and galaxies in simulations, but due to limited numerical resolution, feedback must be implemented using sub-grid models. Observational work is an important means to test and anchor these models, but limited studies have assessed the relative dynamical role of multiple feedback…
Improving Damped Random Walk Parameters for SDSS Stripe 82 Quasars with Pan-STARRS1
Ivezić, Željko; MacLeod, Chelsea; Suberlak, Krzysztof L.
We use the Panoramic Survey Telescope and Rapid Response System 1 Survey (Pan-STARRS1, PS1) data to extend the Sloan Digital Sky Survey (SDSS) Stripe 82 quasar light curves. Combining PS1 and SDSS light curves provides a 15 yr baseline for 9248 quasars—5 yr longer than prior studies that used only SDSS. We fit the light curves with the damped rand…