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The evolution of rest-frame UV properties, Ly α EWs, and the SFR-stellar mass relation at z ∼ 2-6 for SC4K LAEs
da Cunha, E.; Arrabal Haro, P.; Sobral, D. +6 more
We explore deep rest-frame UV to FIR data in the COSMOS field to measure the individual spectral energy distributions (SED) of the ∼4000 SC4K (Sobral et al.) Lyman α (Ly α) emitters (LAEs) at z ∼ 2-6. We find typical stellar masses of 109.3 ± 0.6 M⊙ and star formation rates (SFR) of SFR_SED=4.4^{+10.5}_{-2.4} M⊙ yr…
Superflares and variability in solar-type stars with TESS in the Southern hemisphere
Doyle, J. G.; Ramsay, G.; Doyle, L.
Superflares on solar-type stars have been a rapidly developing field ever since the launch of Kepler. Over the years, there have been several studies investigating the statistics of these explosive events. In this study, we present a statistical analysis of stellar flares on solar-type stars made using photometric data in 2-min cadence from Transi…
Multiple chemodynamic stellar populations of the Ursa Minor dwarf spheroidal galaxy
Djorgovski, S. G.; Geha, Marla; Simon, Joshua D. +6 more
We present a Bayesian method to identify multiple (chemodynamic) stellar populations in dwarf spheroidal galaxies (dSphs) using velocity, metallicity, and positional stellar data without the assumption of spherical symmetry. We apply this method to a new Keck/Deep Imaging Multi-Object Spectrograph (DEIMOS) spectroscopic survey of the Ursa Minor (U…
Stellar Feedback and Resolved Stellar IFU Spectroscopy in the Nearby Spiral Galaxy NGC 300
Kruijssen, J. M. Diederik; Longmore, Steven N.; Chevance, Mélanie +7 more
We present MUSE integral field unit (IFU) observations of five individual H II regions in two giant star-forming complexes in the low-metallicity, nearby dwarf spiral galaxy NGC 300. In combination with high spatial resolution Hubble Space Telescope photometry, we demonstrate the extraction of stellar spectra and classification of individual stars…
Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. I. Precise Distances, Masses, Ages, and 3D Velocities of ∼140,000 Red Clump Stars
Wu, Yaqian; Xiang, Maosheng; Huang, Yang +10 more
We present a sample of ∼140,000 primary red clump (RC) stars of spectral signal-to-noise ratios higher than 20 from the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) Galactic spectroscopic surveys, selected based on their positions in the metallicity-dependent effective temperature-surface gravity and color-metallicity diagram…
The growth of brightest cluster galaxies and intracluster light over the past 10 billion years
Donahue, Megan; Mulchaey, John S.; Connor, Thomas +9 more
We constrain the evolution of the brightest cluster galaxy plus intracluster light (BCG + ICL) using an ensemble of 42 galaxy groups and clusters that span redshifts of z = 0.05-1.75 and masses of M500,c= 2 × 1013-1015 M⊙. Specifically, we measure the relationship between the BCG + ICL stellar mass M
Candidate Population III stellar complex at z = 6.629 in the MUSE Deep Lensed Field
Treu, T.; Castellano, M.; Pentericci, L. +20 more
We discovered a strongly lensed (µ ≳ 40) Ly α emission at z = 6.629 (S/N ≃ 18) in the MUSE Deep Lensed Field (MDLF) targeting the Hubble Frontier Field (HFF) galaxy cluster MACS J0416. Dedicated lensing simulations imply that the Ly α emitting region necessarily crosses the caustic. The arc-like shape of the Ly α extends 3 arcsec on the obse…
Revisiting MOA 2013-BLG-220L: A Solar-type Star with a Cold Super-Jupiter Companion
Cole, Andrew A.; Beaulieu, Jean-Philippe; Bond, Ian A. +7 more
We present the analysis of high-resolution images of MOA-2013-BLG-220, taken with the Keck adaptive optics system six years after the initial observation, identifying the lens as a solar-type star hosting a super-Jupiter-mass planet. The masses of planets and host stars discovered by microlensing are often not determined from light-curve data, whi…
Age demographics of the Milky Way disc and bulge
Evans, N. W.; Belokurov, V.; Grady, J.
We exploit the extensive Gaia Data Release 2 set of long-period variables to select a sample of O-rich Miras throughout the Milky Way disc and bulge for study. Exploiting the relation between Mira pulsation period and stellar age/chemistry, we slice the stellar density of the Galactic disc and bulge as a function of period. We find that the morpho…
Gamma-Ray Urgent Archiver for Novel Opportunities (GUANO): Swift/BAT Event Data Dumps on Demand to Enable Sensitive Subthreshold GRB Searches
Cenko, S. Bradley; Palmer, David M.; Barthelmy, Scott +3 more
We introduce a new capability of the Neil Gehrels Swift Observatory to provide event-level data from the Burst Alert Telescope (BAT) on demand in response to transients detected by other instruments. We show that the availability of these data can effectively increase the rate of detections and arcminute localizations of gamma-ray bursts (GRB) lik…