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Primeval very low-mass stars and brown dwarfs - VI. Population properties of metal-poor degenerate brown dwarfs
Zapatero Osorio, M. R.; Pinfield, D. J.; Burgasser, A. J. +4 more
We presented 15 new T dwarfs that were selected from UKIRT Infrared Deep Sky Survey, Visible and Infrared Survey Telescope for Astronomy , and Wide-field Infrared Survey Explorer surveys, and confirmed with optical to near-infrared spectra obtained with the Very Large Telescope and the Gran Telescopio Canarias. One of these new T dwarfs is mildly …
The Second LBA Calibrator Survey of southern compact extragalactic radio sources - LCS2
Horiuchi, Shinji; Petrov, Leonid; de Witt, Alet +2 more
We present the second catalogue of accurate positions and correlated flux densities for 1100 compact extragalactic radio sources that were not observed before 2008 at high angular resolution. The catalogue spans the declination range [ -90°, -30°] and was constructed from 19 24-h VLBI observing sessions with the Australian Long Baseline Array at 8…
On a New Method to Estimate the Distance, Reddening, and Metallicity of RR Lyrae Stars Using Optical/Near-infrared (B, V, I, J, H, K) Mean Magnitudes: ω Centauri as a First Test Case
Walker, A. R.; Mateo, M.; Valenti, E. +26 more
We developed a new approach to provide accurate estimates of the metal content, reddening, and true distance modulus of RR Lyrae stars (RRLs). The method is based on homogeneous optical (BVI) and near-infrared (JHK) mean magnitudes and on predicted period-luminosity-metallicity relations (IJHK) and absolute mean magnitude-metallicity relations (BV…
Anchor Point of Electron Acceleration around Dipolarization Fronts in Space Plasmas
Fu, H. S.; Liu, C. M.
An anchor point, which is an energy threshold above which electrons are accelerated and below which electrons are decelerated, has recently been reported within the dipolarizing flux bundles behind dipolarization fronts (DFs) both in observations and simulations. However, what determines this point and how it is formed remain unclear. In this stud…
Galaxy Merger Fractions in Two Clusters at z\sim 2 Using the Hubble Space Telescope
Papovich, Casey; van Dokkum, Pieter; Momcheva, Ivelina +9 more
We measure the fraction of galaxy-galaxy mergers in two clusters at z ∼ 2 using imaging and grism observations from the Hubble Space Telescope. The two galaxy cluster candidates were originally identified as overdensities of objects using deep mid-infrared imaging and observations from the Spitzer Space Telescope, and were subsequently followed up…
An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS). V. The Period-Luminosity Relation for Dusty Metal-poor AGB Stars
van Loon, J. Th.; Gehrz, R. D.; Skillman, E. D. +10 more
The survey for DUST in Nearby Galaxies with Spitzer (DUSTiNGS) has identified hundreds of candidate dust-producing asymptotic giant branch (AGB) stars in several nearby metal-poor galaxies. We have obtained multi-epoch follow-up observations for these candidates with the Spitzer Space Telescope and measured their infrared (IR) light curves. This h…
Testing Feedback-regulated Star Formation in Gas-rich, Turbulent Disk Galaxies
Bolatto, A. D.; Fisher, D. B.; Glazebrook, K. +3 more
In this paper we compare the molecular gas depletion times and midplane hydrostatic pressure in turbulent, star-forming disk galaxies to internal properties of these galaxies. For this analysis we use 17 galaxies from the DYNAMO sample of nearby (z ∼ 0.1) turbulent disks. We find a strong correlation, such that galaxies with lower molecular gas de…
H 0 Tension and the Phantom Regime: A Case Study in Terms of an Infrared f(T) Gravity
El-Zant, Amr; El Hanafy, Waleed; Elgammal, Sherif
We propose an f(T) teleparallel gravity theory including a torsional infrared (IR) correction. We show that the governing Friedmann’s equations of a spatially flat universe include a phantom-like effective dark energy term sourced by the torsion IR correction. As has been suggested, this phantom phase does indeed act to reconcile the tension betwe…
Simultaneous Kepler/K2 and XMM-Newton observations of superflares in the Pleiades
Antoniou, V.; Micela, G.; Stauffer, J. +10 more
Context. Flares are powerful events ignited by a sudden release of magnetic energy which triggers a cascade of interconnected phenomena, each resulting in emission in different electromagnetic bands. In fact, in the Sun flares are observed across the whole electromagnetic spectrum. Multi-band observations of stellar flares are instead rare. This l…
The ASAS-SN catalogue of variable stars - IV. Periodic variables in the APOGEE survey
Kochanek, C. S.; Stanek, K. Z.; Thompson, Todd A. +12 more
We explore the synergy between photometric and spectroscopic surveys by searching for periodic variable stars among the targets observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) using photometry from the All-Sky Automated Survey for Supernovae (ASAS-SN). We identified 1924 periodic variables among more than 258 000 AP…