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The Archetypal Ultra-diffuse Galaxy, Dragonfly 44, Is not a Dark Milky Way
Bogdán, Ákos
Due to the peculiar properties of ultra-diffuse galaxies (UDGs), understanding their origin presents a major challenge. Previous X-ray studies demonstrated that the bulk of UDGs lack substantial X-ray emission, implying that they reside in low-mass dark matter halos. This result, in concert with other observational and theoretical studies, pointed…
Deuterated Polycyclic Aromatic Hydrocarbons in the Interstellar Medium: The C-D Band Strengths of Monodeuterated Species
Li, Aigen; Yang, X. J.; Glaser, R.
Deuterium (D) is one of the light elements created in the Big Bang. As the Galaxy evolves, the D/H abundance in the interstellar medium (ISM) decreases from its primordial value due to astration. However, the observed gas-phase D/H abundances of some sightlines in the local Galactic ISM are substantially lower than the expected reduction by astrat…
Study of the low-order Δν-ρ¯ relation for moderately rotating δ Scuti stars and its impact on their characterization
Suárez, J. C.; García Hernández, A.; Rodón, J. R. +1 more
The large separation in the low-radial order regime is considered as a highly valuable observable to derive mean densities of δ Scuti stars, due to its independence with rotation. Up to now, theoretical studies of this Δν- ${\bar{\rho}}$ relation have been limited to 1D non-rotating models and 2D pseudo-evolutionary models. The present work aims a…
Two new double-lined spectroscopic binary white dwarfs
Bergeron, P.; Kilic, Mukremin; Bédard, A. +1 more
We present radial velocity observations of four binary white dwarf candidates identified through their overluminosity. We identify two new double-lined spectroscopic binary systems, WD 0311-649 and WD 1606+422, and constrain their orbital parameters. WD 0311-649 is a 17.7 h period system with a mass ratio of 1.44 ± 0.06 and WD 1606+422 is a 20.1 h…
Orbital Motion, Variability, and Masses in the T Tauri Triple System
Prato, L.; Schaefer, G. H.; Beck, Tracy L. +1 more
We present results from adaptive optics imaging of the T Tauri triple system obtained at the Keck and Gemini Observatories in 2015-2019. We fit the orbital motion of T Tau Sb relative to Sa and model the astrometric motion of their center of mass relative to T Tau N. Using the distance measured by Gaia, we derived dynamical masses of ${M}_{\mathrm…
Multiband Probabilistic Cataloging: A Joint Fitting Approach to Point-source Detection and Deblending
Finkbeiner, Douglas; Daylan, Tansu; Portillo, Stephen K. N. +1 more
Probabilistic cataloging (PCAT) outperforms traditional cataloging methods on single-band optical data in crowded fields. We extend our work to multiple bands, achieving greater sensitivity (∼0.4 mag) and greater speed (500×) compared to previous single-band results. We demonstrate the effectiveness of multiband PCAT on mock data, in terms of both…
PKS 2250-351: A giant radio galaxy in Abell 3936
Seymour, N.; Leahy, D. A.; Norris, R. P. +27 more
We present a detailed analysis of the radio galaxy PKS $2250{-}351$ , a giant of 1.2 Mpc projected size, its host galaxy, and its environment. We use radio data from the Murchison Widefield Array, the upgraded Giant Metre-wavelength Radio Telescope, the Australian Square Kilometre Array Pathfinder, and the Australia Telescope Compact Array to mode…
Three-dimensional reconstruction of multiple particle acceleration regions during a coronal mass ejection
Palmerio, E.; Vainio, R.; Kilpua, E. K. J. +3 more
Context. Some of the most prominent sources for particle acceleration in our Solar System are large eruptions of magnetised plasma from the Sun called coronal mass ejections (CMEs). These accelerated particles can generate radio emission through various mechanisms.
Aims: CMEs are often accompanied by a variety of solar radio bursts with diffe…
The various accretion modes of AM Herculis: Clues from multi-wavelength observations in high accretion states
Sablowski, D.; Schwope, A. D.; Traulsen, I. +1 more
We report on XMM-Newton and NuSTAR X-ray observations of the prototypical polar, AM Herculis, supported by ground-based photometry and spectroscopy, all obtained in high accretion states. In 2005, AM Herculis was in its regular mode of accretion, showing a self-eclipse of the main accreting pole. X-ray emission during the self-eclipse was assigned…
Photometric rotation periods for 107 M dwarfs from the APACHE survey
Sozzetti, A.; Giacobbe, P.; Lattanzi, M. G. +13 more
We present rotation period measurements for 107 M dwarfs in the mass range 0.15-0.70 M_⊙ observed within the context of the APACHE photometric survey. We measure rotation periods in the range 0.5-190 d, with the distribution peaking at ∼30 d. We revise the stellar masses and radii for our sample of rotators by exploiting the Gaia DR2 data. For ∼20…