Search Publications
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…
Empirical relations between the intensities of Lyman lines of H and He+
Vial, J. -C.; Auchère, F.; Bocchialini, K. +9 more
Context. Empirical relations between major UV and extreme UV spectral lines are one of the inputs for models of chromospheric and coronal spectral radiances and irradiances. They are also needed for the interpretation of some of the observations of the Solar Orbiter mission.
Aims: We aim to determine an empirical relation between the intensit…
Explanation of Heliospheric Energetic Neutral Atom Fluxes Observed by the Interstellar Boundary Explorer
McComas, D. J.; Rankin, J. S.; Dayeh, M. A. +3 more
Interstellar neutral atoms propagating into the heliosphere experience charge exchange with the supersonic solar wind (SW) plasma, generating ions that are picked up by the SW. These pickup ions (PUIs) constitute ~25% of the proton number density by the time they reach the heliospheric termination shock (HTS). Preferential acceleration of PUIs at …
1-DREAM: 1D Recovery, Extraction and Analysis of Manifolds in noisy environments
Smith, R.; Peletier, R.; Mastropietro, M. +7 more
Filamentary structures (one-dimensional manifolds) are ubiquitous in astronomical data sets. Be it in particle simulations or observations, filaments are always tracers of a perturbation in the equilibrium of the studied system and hold essential information on its history and future evolution. However, the recovery of such structures is often com…