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Single-lens mass measurement in the high-magnification microlensing event Gaia19bld located in the Galactic disc
Harrison, D. L.; Bryden, G.; Soszyński, I. +66 more
Context. Microlensing provides a unique opportunity to detect non-luminous objects. In the rare cases that the Einstein radius θE and microlensing parallax πE can be measured, it is possible to determine the mass of the lens. With technological advances in both ground- and space-based observatories, astrometric and interferom…
Interstellar Neutrals, Pickup Ions, and Energetic Neutral Atoms Throughout the Heliosphere: Present Theory and Modeling Overview
Zank, Gary P.; Zhang, Ming; Mostafavi, Parisa +11 more
Interstellar neutrals (ISNs), pick-up ions (PUIs), and energetic neutral atoms (ENAs) are fundamental constituents of the heliosphere and its interaction with the neighboring interstellar medium. Here, we focus on selected aspects of present-day theory and modeling of these particles. In the last decades, progress in the understanding of the role …
Finding Quasars behind the Galactic Plane. II. Spectroscopic Identifications of 204 Quasars at ∣b∣ < 20°
Zheng, Jie; Jiang, Linhua; Feng, Xiaotong +21 more
Quasars behind the Galactic plane (GPQs) are important astrometric references and valuable probes of Galactic gas, yet the search for GPQs is difficult due to severe extinction and source crowding in the Galactic plane. In this paper, we present a sample of 204 spectroscopically confirmed GPQs at ∣b∣ < 20°, 191 of which are new discoveries. Thi…
ALMA Observations of Molecular Complexity in the Large Magellanic Cloud: The N 105 Star-forming Region
Tokuda, Kazuki; Onishi, Toshikazu; Kurtz, Stan E. +18 more
The Large Magellanic Cloud (LMC) is the nearest laboratory for detailed studies on the formation and survival of complex organic molecules (COMs), including biologically important ones, in low-metallicity environments-typical of earlier cosmological epochs. We report the results of 1.2 mm continuum and molecular line observations of three fields i…
Multiply eclipsing candidates from the TESS satellite
Mašek, M.; Zasche, P.; Henzl, Z.
We present a catalogue of the Transiting Exoplanet Survey Satellite (TESS) targets that show multiple eclipses. In all of these stars, we detected two sets of eclipses, for which their two distinctive periods can be derived. These multiple stellar systems could either be doubly eclipsing quadruples or triple-star coplanar systems showing eclipses …
Transient obscuration event captured in NGC 3227. II. Warm absorbers and obscuration events in archival XMM-Newton and NuSTAR observations
Kaspi, Shai; Kriss, Gerard A.; Mehdipour, Missagh +18 more
The relationship between warm absorber (WA) outflows of active galactic nuclei and nuclear obscuration activities caused by optically thick clouds (obscurers) crossing the line of sight is still unclear. NGC 3227 is a suitable target for studying the properties of both WAs and obscurers because it matches the following selection criteria: WAs in b…
Detectability of Black Hole Binaries with Gaia: Dependence on Binary Evolution Models
Shikauchi, Minori; Tanikawa, Ataru; Kawanaka, Norita
The astrometric satellite Gaia is expected to observe noninteracting black hole (BH) binaries with luminous companions (LCs; hereafter BH-LC binaries), a different population from BH X-ray binaries previously discovered. The detectability of BH-LC binaries with Gaia might be dependent on binary evolution models. We investigated the Gaia's detectab…
A WISE view on extreme AGB stars
Groenewegen, M. A. T.
Context. Variability is a key property of stars on the asymptotic giant branch (AGB). Their pulsation period is related to the luminosity and mass-loss rate (MLR) of the star. Long-period variables (LPVs) and Mira variables are the most prominent of all types of variability of evolved stars. However, the reddest, most obscured AGB stars are too fa…
Identification and Spectroscopic Characterization of 128 New Herbig Stars
Panić, Olja; Pérez-Martínez, Ricardo; Oudmaijer, René D. +6 more
We present optical spectroscopy observations of 145 high-mass pre-main-sequence candidates from the catalog of Vioque et al. 2020 From these, we provide evidence for the Herbig nature of 128 sources. This increases the number of known objects of the class by ~50%. We determine the stellar parameters of these sources using the spectra and Gaia EDR3…
The average dust attenuation curve at z 1.3 based on HST grism surveys
Malkan, M. A.; Calzetti, D.; Scarlata, C. +12 more
We present the first characterization of the average dust attenuation curve at z ~ 1.3 by combining rest-frame ultraviolet through near-IR photometry with Balmer decrement (H α/H β) constraints for ~900 galaxies with 8 ≲ log (M⋆/M⊙) < 10.2 at 0.75 < z < 1.5 in the HST WFC3 IR Spectroscopic Parallel and 3D-HST grism s…