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The Carnegie-Chicago Hubble Program. IX. Calibration of the Tip of the Red Giant Branch Method in the Megamaser Host Galaxy, NGC 4258 (M106)
Madore, Barry F.; Freedman, Wendy L.; Beaton, Rachael L. +7 more
In the nearby galaxy NGC 4258, the well-modeled orbital motion of H2O masers about its supermassive black hole provides the means to measure a precise geometric distance. As a result, NGC 4258 is one of a few "geometric anchors" available to calibrate the true luminosities of stellar distance indicators such as the Tip of the Red Giant …
The growth of intracluster light in XCS-HSC galaxy clusters from 0.1 < z < 0.5
Baldry, Ivan K.; Kelvin, Lee S.; Stott, John P. +14 more
We estimate the intracluster light (ICL) component within a sample of 18 clusters detected in the XMM Cluster Survey (XCS) data using the deep (~26.8 mag) Hyper Suprime-Cam Subaru Strategic Programme data release 1 i-band data. We apply a rest-frame µB = 25 mag arcsec-2 isophotal threshold to our clusters, below which w…
Evaluating Rotation Periods of M Dwarfs across the Ages
Angus, Ruth; Kiman, Rocio; Faherty, Jacqueline K. +5 more
In this work we examine M dwarf rotation rates at a range of ages to establish benchmarks for M dwarf gyrochronology. This work includes a sample of 713 spectroscopically classified M0-M8 dwarfs with new rotation rates measured from K2 light curves. We analyze data and recover rotation rates for 179 of these objects. We add these to rotation rates…
Resolving local and global kinematic signatures of satellite mergers with billion particle simulations
Laporte, Chervin F. P.; Johnston, Kathryn V.; Hunt, Jason A. S. +3 more
In this work, we present two new ~109 particle self-consistent simulations of the merger of a Sagittarius-like dwarf galaxy with a Milky Way (MW)-like disc galaxy. One model is a violent merger creating a thick disc, and a Gaia-Enceladus/Sausage-like remnant. The other is a highly stable disc which we use to illustrate how the improved …
A Dynamical Measurement of the Disk Mass in Elias 227
Testi, Leonardo; Lodato, Giuseppe; Pérez, Laura M. +4 more
Recent multi-wavelength Atacama Large Millimeter/submillimeter Array (ALMA) observations of the protoplanetary disk orbiting around Elias 227 revealed a two-armed spiral structure. The observed morphology, together with the young age of the star and the disk-to-star mass ratio estimated from dust-continuum emission, make this system a perfect labo…
The Hubble PanCET Program: Transit and Eclipse Spectroscopy of the Strongly Irradiated Giant Exoplanet WASP-76b
Deming, Drake; Nikolov, Nikolay; Sing, David K. +22 more
Ultra-hot Jupiters with equilibrium temperatures greater than 2000 K are uniquely interesting targets as they provide us crucial insights into how atmospheres behave under extreme conditions. This class of giant planets receives intense radiation from their host star and usually has strongly irradiated and highly inflated atmospheres. At such a hi…
On the multiwavelength variability of Mrk 110: two components acting at different time-scales
McHardy, I.; Breedt, E.; Peterson, B. M. +17 more
We present the first intensive continuum reverberation mapping study of the high accretion-rate Seyfert galaxy Mrk 110. The source was monitored almost daily for more than 200 d with the Swift X-ray and ultraviolet (UV)/optical telescopes, supported by ground-based observations from Las Cumbres Observatory, the Liverpool Telescope, and the Zowada …
A tale of two mergers: constraints on kilonova detection in two short GRBs at z ∼ 0.5
Troja, E.; Wollaeger, R. T.; Cenko, S. B. +15 more
We present a detailed multiwavelength analysis of two short gamma-ray bursts (sGRBs) detected by the Neil Gehrels Swift Observatory: GRB 160624A at $z$ = 0.483 and GRB 200522A at $z$ = 0.554. These sGRBs demonstrate very different properties in their observed emission and environment. GRB 160624A is associated with a late-type galaxy with an old s…
A catalogue of 74 new open clusters found in Gaia Data-Release 2
Xu, Ye; Li, Jing-Jing; Wu, Zhen-Yu +2 more
Based on astrometric data from Gaia Data-Release 2 (DR2), we employ an unsupervised machine learning method to blindly search for open star clusters in the Milky Way within the Galactic latitude range of |b| < 20°. In addition to 2080 known clusters, 74 new open cluster candidates are found. In this work, we present the positions, apparent radi…
Abundance-age relations with red clump stars in open clusters
Jordi, C.; Casamiquela, L.; Balaguer-Núñez, L. +8 more
Context. Precise chemical abundances coupled with reliable ages are key ingredients to understanding the chemical history of our Galaxy. Open clusters (OCs) are useful for this purpose because they provide ages with good precision.
Aims: The aim of this work is to investigate the relation between different chemical abundance ratios and age tr…