Search Publications
The Proper-motion Field along the Magellanic Bridge: A New Probe of the LMC-SMC Interaction
van der Marel, Roeland P.; Anderson, J.; Besla, Gurtina +6 more
We present the first detailed kinematic analysis of the proper motions (PMs) of stars in the Magellanic Bridge, from both the Gaia Data Release 2 catalog and from Hubble Space Telescope (HST) Advanced Camera for Surveys data. For the Gaia data, we identify and select two populations of stars in the Bridge region, young main-sequence (MS) and red g…
Fast Outflows Identified in Early Star-forming Galaxies at z = 5-6
Ouchi, Masami; Blaizot, Jérémy; Bouché, Nicolas +3 more
We present velocities of galactic outflows in seven star-forming galaxies at z = 5-6 with stellar masses of M * ∼ 1010.1 {M}⊙ . Although it is challenging to observationally determine the outflow velocities, we overcome this by using ALMA [C II] 158 µm emission lines for systemic velocities and deep Keck spec…
Galaxy structure with strong gravitational lensing: decomposing the internal mass distribution of massive elliptical galaxies
Tam, Sut-Ieng; Nightingale, James W.; Cooper, Andrew P. +4 more
We investigate how strong gravitational lensing can test contemporary models of massive elliptical (ME) galaxy formation, by combining a traditional decomposition of their visible stellar distribution with a lensing analysis of their mass distribution. As a proof of concept, we study a sample of three ME lenses, observing that all are composed of …
The Largest M Dwarf Flares from ASAS-SN
Drout, Maria R.; Kochanek, C. S.; Madore, Barry F. +13 more
The All-sky Automated Survey for Supernovae (ASAS-SN) is the only project in existence to scan the entire sky in optical light approximately every day, reaching a depth of g ∼ 18 mag. Over the course of its first 4 yr of transient alerts (2013-2016), ASAS-SN observed 53 events classified as likely M dwarf flares. We present follow-up photometry an…
The Relationship between Globular Cluster Mass, Metallicity, and Light-element Abundance Variations
Cohen, Roger E.; Ting, Yuan-Sen; Wyse, Rosemary F. G. +7 more
We investigate aluminum abundance variations in the stellar populations of globular clusters using both literature measurements of sodium and aluminum and APOGEE measurements of nitrogen and aluminum abundances. For the latter, we show that the Payne is the most suitable of the five available abundance pipelines for our purposes. Our combined samp…
Rotation rate of the solar core as a key constraint to magnetic angular momentum transport in stellar interiors
Buldgen, G.; Eggenberger, P.; Salmon, S. J. A. J.
Context. The internal rotation of the Sun constitutes a fundamental constraint when modelling angular momentum transport in stellar interiors. In addition to the more external regions of the solar radiative zone probed by pressure modes, measurements of rotational splittings of gravity modes would offer an invaluable constraint on the rotation of …
On the lack of correlation between [O III]/[O II] and Lyman continuum escape fraction
Ryan-Weber, E. V.; Nanayakkara, T.; Sawicki, M. +9 more
We present the first results of our pilot study of eight photometrically selected Lyman-continuum (LyC) emitting galaxy candidates from the COSMOS field and focus on their optical emission line ratios. Observations were performed in the H and K bands using the Multi-Object Spectrometer for Infra-Red Exploration (MOSFIRE) instrument at the Keck Obs…
On the Gas Content, Star Formation Efficiency, and Environmental Quenching of Massive Galaxies in Protoclusters at z ≈ 2.0-2.5
Treister, E.; Toft, S.; Scoville, N. +10 more
We present ALMA Band 6 (ν = 233 GHz, λ = 1.3 mm) continuum observations toward 68 “normal” star-forming galaxies within two Coma-like progenitor structures at z = 2.10 and 2.47, from which ISM masses are derived, providing the largest census of molecular gas mass in overdense environments at these redshifts. Our sample comprises galaxies with a st…
An alternative interpretation of the exomoon candidate signal in the combined Kepler and Hubble data of Kepler-1625
Heller, René; Rodenbeck, Kai; Bruno, Giovanni
Context. Kepler and Hubble photometry of a total of four transits by the Jupiter-sized exoplanet Kepler-1625 b have recently been interpreted to show evidence of a Neptune-sized exomoon. The key arguments were an apparent drop in stellar brightness after the planet's October 2017 transit seen with Hubble and its 77.8 min early arrival compared to …
The search for multiple populations in Magellanic Clouds clusters - V. Correlation between cluster age and abundance spreads
Martocchia, S.; Dalessandro, E.; Salaris, M. +13 more
In our HST photometric survey, we have been searching for multiple stellar populations (MPs) in Magellanic Clouds (MCs) massive star clusters which span a significant range of ages (∼1.5-11 Gyr). In the previous papers of the series, we have shown that the age of the cluster represents one of the key factors in shaping the origin of the chemical a…