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Tidal Effects on the Radial Velocities of V723 Mon: Additional Evidence for a Dark 3 M⊙ Companion
Hirano, Teruyuki; Masuda, Kento
Jayasinghe et al. identified a dark ≈3 M⊙ companion on a nearly edge-on ≈60 day orbit around the red giant star V723 Monoceros as a black hole candidate in the mass gap. This scenario was shown to explain most of the data presented by Jayasinghe et al., except for periodic radial velocity (RV) residuals from the circular Keplerian model…
Relation of Microstreams in the Polar Solar Wind to Switchbacks and Coronal X-Ray Jets
Neugebauer, Marcia; Sterling, Alphonse C.
Ulysses data obtained at high solar latitudes during periods of minimum solar activity in 1994 and 2007 are examined to determine the relation between velocity structures called microstreams and folds in the magnetic field called switchbacks. A high correlation is found. The possibility of velocity peaks in microstreams originating from coronal X-…
Quantitative inference of the H2 column densities from 3 mm molecular emission: case study towards Orion B
Peretto, Nicolas; Hughes, Annie; Kainulainen, Jouni +21 more
Context. Based on the finding that molecular hydrogen is unobservable in cold molecular clouds, the column density measurements of molecular gas currently rely either on dust emission observation in the far-infrared, which requires space telescopes, or on star counting, which is limited in angular resolution by the stellar density. The (sub)millim…
Optical photometry of two transitional millisecond pulsars in the radio pulsar state
Dhillon, V. S.; Marsh, T. R.; Clark, C. J. +7 more
We present ULTRACAM multiband optical photometry of two transitional millisecond pulsars (tMSPs), PSR J1023+0038 and PSR J1227-4853, taken while both were in their radio pulsar states. The light curves show significant asymmetry about the flux maxima in all observed bands, suggesting an asymmetric source of heating in the system. We model the ligh…
Kinematics and multiband period-luminosity-metallicity relation of RR Lyrae stars via statistical parallax
Dambis, A. K.; Berdnikov, L. N.; Grebel, E. K. +2 more
This paper presents results from photometric and statistical-parallax analysis of a sample of 850 field RR Lyrae (RRL) variables. The photometric and spectroscopic data for our sample of RRLs are obtained from (1) our new spectroscopic observations (for 448 RRLs) carried out with the Southern African Large Telescope; (2) our photometric observatio…
The Thermal Sunyaev-Zel'dovich Effect from Massive, Quiescent 0.5 ≤ z ≤ 1.5 Galaxies
Cohen, Seth; Scannapieco, Evan; Mauskopf, Philip +5 more
We use combined South Pole Telescope (SPT)+Planck temperature maps to analyze the circumgalactic medium (CGM) encompassing 138,235 massive, quiescent 0.5 ≤ z ≤ 1.5 galaxies selected from data from the Dark Energy Survey (DES) and Wide-Field Infrared Survey Explorer (WISE). Images centered on these galaxies were cut from the 1.85 arcmin resolution …
Cosmological Constraints from Galaxy Cluster Sparsity, Cluster Gas Mass Fraction, and Baryon Acoustic Oscillation Data
Sereno, Mauro; Ettori, Stefano; Corasaniti, Pier-Stefano
In recent years, the availability of large, complete cluster samples has enabled numerous cosmological parameter inference analyses using cluster number counts. These have provided constraints on the cosmic matter density Ωm and the amplitude of matter density fluctuations σ8 alternative to that obtained from other standard p…
Morphology, Morphometry and Distribution of Isolated Landforms in Southern Chryse Planitia, Mars
Fawdon, Peter; Balme, Matthew R.; McNeil, Joseph D. +1 more
The margin of Chryse Planitia, Mars, contains >105 kilometer scale mesas, buttes, and plateaus ("mounds"), many of which are found in and around Oxia Planum, the ExoMars 2022 Rover landing site. Despite this, their origins and evolution are unknown. We have analyzed the morphologies and morphometries of 14,386 individual mounds to: (…
Comparative high-resolution spectroscopy of M dwarfs: Exploring non-LTE effects
Heiter, U.; Kochukhov, O.; Olander, T.
Context. M dwarfs are key targets for high-resolution spectroscopy and model atmosphere analyses because of the high incidence of these stars in the solar neighbourhood and their importance as exoplanetary hosts. Several methodological challenges make such analyses difficult, leading to significant discrepancies in the published results.
Aims…
Black hole feeding and star formation in NGC 1808
Krips, M.; van der Werf, P.; Combes, F. +11 more
We report on Atacama Large Millimeter Array (ALMA) observations of CO(3−2) emission in the Seyfert2/starburst galaxy NGC 1808, at a spatial resolution of 4 pc. Our aim is to investigate the morphology and dynamics of the gas inside the central 0.5 kpc and to probe the nuclear feeding and feedback phenomena. We discovered a nuclear spiral of radius…