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Substructure and halo population of Double Cluster h and χ Persei
Chen, Li; Zhong, Jing; Li, Lu +3 more
Context. Gaia DR2 provides an ideal dataset to study the stellar populations of open clusters at larger spatial scales because the cluster member stars can be well identified by their location in the multidimensional observational parameter space with high precision parameter measurements.
Aims: In order to study the stellar population and po…
Imaging the Thermal and Kinematic Sunyaev-Zel'dovich Effect Signals in a Sample of 10 Massive Galaxy Clusters: Constraints on Internal Velocity Structures and Bulk Velocities
Mroczkowski, Tony; Cibirka, Nathália; Zitrin, Adi +10 more
We have imaged the Sunyaev-Zel'dovich (SZ) effect signals at 140 and 270 GHz toward 10 galaxy clusters with Bolocam and AzTEC/ASTE. We also used Planck data to constrain the signal at large angular scales, Herschel-SPIRE images to subtract the brightest galaxies that comprise the cosmic infrared background (CIB), Chandra imaging to map the electro…
Stellar Rotation and the Extended Main-sequence Turnoff in the Open Cluster NGC 5822
Albrow, Michael D.; Deng, Licai; de Grijs, Richard +1 more
The origin of extended main-sequence turnoffs (eMSTOs) in intermediate-age (1-3 Gyr) clusters is one of the most intriguing questions in current star cluster research. Unlike the split main sequences found in some globular clusters, which are caused by bimodal populations in age and/or chemical abundances, eMSTOs are believed to be due to stellar …
HATS-60b-HATS-69b: 10 Transiting Planets from HATSouth
Arriagada, P.; Butler, R. P.; Henning, Th. +27 more
We report the discovery of 10 transiting extrasolar planets by the HATSouth survey. The planets range in mass from the super-Neptune HATS-62b, with {M}p< 0.179 {M}{{J}}, to the super-Jupiter HATS-66b, with {M}p=5.33 {M}{{J}}, and in size from the Saturn HATS-69b, with {R}p=0.94 {R}{{J<…
Identifying Sagittarius Stream Stars by Their APOGEE Chemical Abundance Signatures
Bizyaev, Dmitry; Pan, Kaike; Cunha, Katia +17 more
The SDSS-IV Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey provides precise chemical abundances of 18 chemical elements for ∼176,000 red giant stars distributed over much of the Milky Way Galaxy (MW), and includes observations of the core of the Sagittarius dwarf spheroidal galaxy (Sgr). The APOGEE chemical abundance patter…
The HST Large Programme on NGC 6752 - II. Multiple populations at the bottom of the main sequence probed in NIR
Salaris, M.; Apai, D.; Anderson, J. +12 more
Historically, multiple populations in globular clusters (GCs) have been mostly studied from ultraviolet and optical filters down to stars that are more massive than ∼0.6 M_{\odot }. Here, we exploit deep near-infrared (NIR) photometry from the Hubble Space Telescope to investigate multiple populations among M-dwarfs in the GC NGC 6752. We discover…
Evolution of galactic planes of satellites in the EAGLE simulation
Frenk, Carlos S.; Cautun, Marius; Shao, Shi
We study the formation of planes of dwarf galaxies around Milky Way (MW)-mass haloes in the EAGLE galaxy formation simulation. We focus on satellite systems similar to the one in the MW: spatially thin or with a large fraction of members orbiting in the same plane. To characterize the latter, we introduce a robust method to identify the subsets of…
Space Telescope and Optical Reverberation Mapping Project. X. Understanding the Absorption-line Holiday in NGC 5548
Brandt, W. N.; Knigge, C.; Kriss, G. A. +27 more
The Space Telescope and Optical Reverberation Mapping Project (AGN STORM) on NGC 5548 in 2014 is one of the most intensive multiwavelength AGN monitoring campaigns ever. For most of the campaign, the emission-line variations followed changes in the continuum with a time lag, as expected. However, the lines varied independently of the observed UV-o…
The Relationship between Galaxy ISM and Circumgalactic Gas Metallicities
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +3 more
We present interstellar matter (ISM) and circumgalactic medium (CGM) metallicities for 25 absorption systems associated with isolated star-forming galaxies (≤ft< z\right> =0.28) with 9.4 ≤ log(M */M ⊙) ≤ 10.9 and with absorption detected within (200 kpc). Galaxy ISM metallicities were measured using Hα/[N II] emission l…
A survey of water production in 61 comets from SOHO/SWAN observations of hydrogen Lyman-alpha: Twenty-one years 1996-2016
Bertaux, J. -L.; Combi, M. R.; Quémerais, E. +2 more
The Solar Wind Anisotropies (SWAN) instrument on the SOlar and Heliospheric Observatory (SOHO) satellite has observed 44 long period and new Oort cloud comets and 36 apparitions of 17 short period comets since its launch in December 1995. Water production rates have been determined from the over 3700 images producing a consistent set of activity v…