Search Publications
Missions
Journals
Publication Years
The evolution of galaxy shapes in CANDELS: from prolate to discy
Faber, S. M.; Lin, Lin; Zhang, Haowen +9 more
We model the projected b/a-log a distributions of CANDELS star-forming main-sequence galaxies, where a (b) is the half-light semimajor (semiminor) axis of the galaxy images measured by GALFIT. We find that smaller a galaxies are rounder at all stellar masses M* and redshifts, so we include a when analysing b/a distributions. Approximati…
CLEAR. I. Ages and Metallicities of Quiescent Galaxies at 1.0 < z < 1.8 Derived from Deep Hubble Space Telescope Grism Data
Papovich, Casey; Dickinson, Mark; Giavalisco, Mauro +14 more
We use deep Hubble Space Telescope spectroscopy to constrain the metallicities and (light-weighted) ages of massive ({log}{M}* /{M}⊙ ≳ 10) galaxies selected to have quiescent stellar populations at 1.0 < z < 1.8. The data include twelve-orbit depth coverage with the WFC3/G102 grism covering ∼8000 < λ < 11,500 Å at…
SkyMapper stellar parameters for Galactic Archaeology on a grand-scale
Wolf, C.; Yong, D.; Casagrande, L. +3 more
The SkyMapper photometric surveys provides uvgriz photometry for several millions sources in the Southern sky. We use DR1.1 to explore the quality of its photometry, and develop a formalism to homogenize zero-points across the sky using stellar effective temperatures. Physical flux transformations, and zero-points appropriate for this release are …
The wide binary fraction of solar-type stars: emergence of metallicity dependence at a < 200 au
Rix, Hans-Walter; El-Badry, Kareem
We combine a catalogue of wide binaries constructed from Gaia DR2 with [Fe/H] abundances from wide-field spectroscopic surveys to quantify how the binary fraction varies with metallicity over separations 50 ≲ s/au ≲ 50 000. At a given distance, the completeness of the catalogue is independent of metallicity, making it straightforward to constrain …
A hypervelocity star with a Magellanic origin
Boubert, Douglas; Erkal, Denis; Evans, N. Wyn +2 more
Using proper motion measurements from Gaia Data Release 2, we probe the origin of 26 previously known hypervelocity stars (HVSs) around the Milky Way. We find that a significant fraction of these stars have a high probability of originating in the Milky Way Galaxy, but there is one obvious outlier. HVS3 is highly likely to be coming almost from th…
Recovering Thermodynamics from Spectral Profiles observed by IRIS: A Machine and Deep Learning Approach
De Pontieu, Bart; Gošić, Milan; Sainz Dalda, Alberto +1 more
Inversion codes allow the reconstruction of a model atmosphere from observations. With the inclusion of optically thick lines that form in the solar chromosphere, such modeling is computationally very expensive because a non-LTE evaluation of the radiation field is required. In this study, we combine the results provided by these traditional metho…
New Constraints From Dust Lines on the Surface Densities of Protoplanetary Disks
Murray-Clay, Ruth; Pérez, Laura M.; Powell, Diana +2 more
We present new determinations of disk surface density, independent of an assumed dust opacity, for a sample of seven bright, diverse, protoplanetary disks using measurements of disk dust lines. We develop a robust method for determining the location of dust lines by modeling disk interferometric visibilities at multiple wavelengths. The disks in o…
Revealing the Stellar Mass and Dust Distributions of Submillimeter Galaxies at Redshift 2
Thomson, A. P.; Magnelli, B.; Ivison, R. J. +35 more
We combine high-resolution ALMA and HST/CANDELS observations of 20 submillimeter galaxies (SMGs), predominantly from the AS2UDS survey at z ≃ 2, with bright rest-frame optical counterparts ({K}{{s}}≲ 22.9) to investigate the resolved structural properties of their dust and stellar components. We derive two-dimensional stellar-mass distr…
High-resolution ALMA Observations of HD 100546: Asymmetric Circumstellar Ring and Circumplanetary Disk Upper Limits
Pineda, Jaime E.; Testi, Leonardo; Garufi, Antonio +7 more
We present long-baseline Atacama Large Millimeter/submillimeter Array observations of the 870 µm dust continuum emission and CO (3-2) from the protoplanetary disk around the Herbig Ae/Be star HD 100546, which is one of the few systems claimed to have two young embedded planets. These observations achieve a resolution of 4 au (3.8 mas), an rm…
The remarkable X-ray variability of IRAS 13224-3809 - I. The variability process
Young, A. J.; Fabian, A. C.; Reynolds, C. S. +17 more
We present a detailed X-ray timing analysis of the highly variable narrow-line Seyfert 1 (NLS1) galaxy IRAS 13224-3809. The source was recently monitored for 1.5 Ms with XMM-Newton, which, combined with 500 ks archival data, makes this the best-studied NLS1 galaxy in X-rays to date. We apply standard time- and Fourier-domain techniques in order to…