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The Global Structure of the Milky Way's Stellar Halo Based on the Orbits of Local Metal-poor Stars
Chiba, Masashi; Sato, Genta
We analyze the global structure of the Milky Way (MW)'s stellar halo, including its dominant subcomponent, Gaia-Sausage-Enceladus (GSE). The method for reconstructing the global distribution of this old stellar component is to employ the superposition of the orbits covering the large MW's space, where each of the orbit-weighting factors is assigne…
The Physical Properties of Massive Green Valley Galaxies as a Function of Environments at 0.5 < z < 2.5 in 3D-HST/Candels Fields
Fang, Guanwen; Lin, Zesen; Kong, Xu +3 more
To investigate the effects of environment in the quenching phase, we study the empirical relations for green valley (GV) galaxies between overdensity and other physical properties (i.e., effective radius r e , Sérsic indices n, and specific star formation rate (sSFR)). Based on five 3D-HST/CANDELS fields, we construct a large sample of …
Data reduction and restoration of spectropolarimetric microlensed hyperspectral imager data
van Noort, M.; Doerr, H. -P.
Context. A microlensed hyperspectral imager (MiHI) is an integral field spectrograph based on a double-sided microlens array.
Aims: To convert the raw data frames of such an instrument to hyperspectral cubes, and restore them to high-resolution science-ready Stokes data, a new kind of data reduction procedure is required.
Methods: An opt…
Breaking the rules at z ≃ 0.45: The rebel case of RBS 1055
Stern, D.; Bianchi, S.; Guainazzi, M. +5 more
Context. Very luminous quasars are unique sources for studying the circumnuclear environment around supermassive black holes. Several components contribute to the overall X-ray spectral shape of active galactic nuclei (AGN). The hot (kTe = 50 − 100 keV) and warm (kTe = 0.1 − 1 keV) coronae are responsible for the hard and sof…
A Massive AGB Donor in Scutum X-1: Identification of the First Mira Variable in an X-Ray Binary
Soria, Roberto; Conroy, Charlie; Chakrabarty, Deepto +9 more
The symbiotic X-ray binary Sct X-1 was suggested to be the first known neutron star accreting from a red supergiant companion. Although known for nearly 50 yr, detailed characterization of the donor remains lacking, particularly due to the extremely high reddening toward the source (A V ≳ 25 mag). Here, we present (i) improved localiz…
ALMA Observations of CO Emission from Luminous Lyman-break Galaxies at z = 6.0293-6.2037
Ono, Yoshiaki; Ouchi, Masami; Fujimoto, Seiji +14 more
We present our new Atacama Large Millimeter/submillimeter Array (ALMA) observations targeting CO(6-5) emission from three luminous Lyman-break galaxies (LBGs) at z spec = 6.0293-6.2037 found in the Subaru/Hyper Suprime-Cam survey, whose [O III] 88 µm and [C II] 158 µm emissions have been detected with ALMA. We find a margina…
Supplement: "An Isolated Mass-gap Black Hole or Neutron Star Detected with Astrometric Microlensing" (2022, ApJL, 933, L23)
Lu, Jessica R.; Udalski, Andrzej; Mróz, Przemek +42 more
This supplement provides supporting material for Lam et al. We briefly summarize past gravitational microlensing searches for black holes (BHs) and present details of the observations, analysis, and modeling of five BH candidates observed with both ground-based photometric microlensing surveys and Hubble Space Telescope astrometry and photometry. …
H α-based star formation rates in and around z 0.5 EDisCS clusters
Weiner, Benjamin J.; Teplitz, Harry I.; Moustakas, John +14 more
We investigate the role of environment on star formation rates (SFRs) of galaxies at various cosmic densities in well-studied clusters. We present the star-forming main sequence for 163 galaxies in four EDisCS clusters in the range 0.4 < z < 0.7. We use Hubble Space Telescope/Wide Field Camera 3 observations of the H α emission line to span …
Using multiple instance learning for explainable solar flare prediction
Melchior, M.; Huwyler, C.
In this work we leverage a weakly-labeled dataset of spectral data from NASA's IRIS satellite for the prediction of solar flares using the Multiple Instance Learning (MIL) paradigm. While standard supervised learning models expect a label for every instance, MIL relaxes this and only considers bags of instances to be labeled. This is ideally suite…
White-Light Coronal Imaging at the 21 August 2017 Total Solar Eclipse
Pasachoff, Jay M.; Rušin, Vojtech
We describe the solar corona as imaged in the 21 August 2017 total solar eclipse from sites in Oregon and Illinois, USA separated by nearly one hour. Our composite images, each made from dozens of individual frames, show helmet streamers, nearly radially oriented narrow rays, and polar coronal holes filled with polar plumes. The Ludendorff flatten…