Search Publications
APOGEE Net: An Expanded Spectral Model of Both Low-mass and High-mass Stars
Stassun, Keivan G.; Kounkel, Marina; Beaton, Rachael L. +17 more
We train a convolutional neural network, APOGEE Net, to predict T eff, $\mathrm{log}g$ , and, for some stars, [Fe/H], based on the APOGEE spectra. This is the first pipeline adapted for these data that is capable of estimating these parameters in a self-consistent manner not only for low-mass stars, (such as main-sequence dwarfs, pre-ma…
Non-LTE abundance corrections for late-type stars from 2000 Å to 3 µm. I. Na, Mg, and Al
Sneden, C.; Lind, K.; Barklem, P. S. +6 more
Context. It is well known that cool star atmospheres depart from local thermodynamic equilibrium (LTE). Making an accurate abundance determination requires taking those effects into account, but the necessary non-LTE (hereafter NLTE) calculations are often lacking.
Aims: Our goal is to provide detailed estimates of NLTE effects for FGK type s…
Statistics of galaxy mergers: bridging the gap between theory and observation
Baugh, Carlton M.; Lacey, Cedric G.; Huško, Filip
We present a study of galaxy mergers up to z = 10 using the Planck Millennium cosmological dark matter simulation and the GALFORM semi-analytical model of galaxy formation. Utilizing the full 800 Mpc3 volume of the simulation, we studied the statistics of galaxy mergers in terms of merger rates and close pair fractions. We predict that …
A Uniform Type Ia Supernova Distance Ladder with the Zwicky Transient Facility: Absolute Calibration Based on the Tip of the Red Giant Branch Method
Riddle, Reed; Madore, Barry F.; Freedman, Wendy L. +21 more
The current Cepheid-calibrated distance ladder measurement of H 0 is reported to be in tension with the values inferred from the cosmic microwave background (CMB), assuming standard cosmology. However, some tip of the red giant branch (TRGB) estimates report H 0 in better agreement with the CMB. Hence, it is critical to reduc…
Planetary nebula luminosity function distances for 19 galaxies observed by PHANGS-MUSE
Van Dyk, Schuyler D.; Kruijssen, J. M. Diederik; Rosolowsky, Erik +15 more
We provide new planetary nebula luminosity function (PNLF) distances to 19 nearby spiral galaxies that were observed with VLT/MUSE by the PHANGS collaboration. Emission line ratios are used to separate planetary nebulae (PNe) from other bright $[\mathrm{O}\, {\small III}]$ emitting sources like compact supernovae remnants (SNRs) or H II regions. W…
GASKAP-HI pilot survey science I: ASKAP zoom observations of HI emission in the Small Magellanic Cloud
van Loon, J. Th.; Lee, M. -Y.; Joncas, G. +53 more
We present the most sensitive and detailed view of the neutral hydrogen ( ${H\small I}$ ) emission associated with the Small Magellanic Cloud (SMC), through the combination of data from the Australian Square Kilometre Array Pathfinder (ASKAP) and Parkes (Murriyang), as part of the Galactic Australian Square Kilometre Array Pathfinder (GASKAP) pilo…
Reconstructing the Pleiades with Gaia EDR3
Caiazzo, Ilaria; Richer, Harvey B.; Heyl, Jeremy
We search through an eight million cubic parsec volume surrounding the Pleiades star cluster and the Sun to identify both the current and past members of the Pleiades cluster within the Gaia EDR3 data set. We find nearly 1300 current cluster members and 289 former cluster candidates. Many of these candidates lie well in front of or behind the clus…
Three-dimensional Shape Explains Star Formation Mystery of California and Orion A
Kainulainen, Jouni; Rezaei Kh., Sara
The new Gaia data release (EDR3) with improved astrometry has opened a new era in studying our Milky Way in fine detail. We use Gaia EDR3 astrometry together with 2MASS and WISE photometry to study two of the most massive molecular clouds in the solar vicinity: Orion A and California. Despite having remarkable similarities in the plane of the sky …
PetroFit: A Python Package for Computing Petrosian Radii and Fitting Galaxy Light Profiles
Crawford, Steven M.; Hunt, Lucas; Tollerud, Erik +3 more
PetroFit is an open-source Python package based on Astropy and Photutils that can calculate Petrosian profiles and fit galaxy images. It offers end-to-end tools for making accurate photometric measurements, estimating morphological properties, and fitting 2D models to galaxy images. Petrosian metric radii can be used for model parameter estimation…
The bright extragalactic ALMA redshift survey (BEARS) I: redshifts of bright gravitationally lensed galaxies from the Herschel ATLAS
Berta, S.; Andreani, P.; Omont, A. +53 more
We present spectroscopic measurements for 71 galaxies associated with 62 of the brightest high-redshift submillimetre sources from the Southern fields of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS), while targeting 85 sources which resolved into 142. We have obtained robust redshift measurements for all sources using the 12-m …