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Data-driven Stellar Models
Rix, Hans-Walter; Fouesneau, Morgan; Zucker, Catherine +7 more
We developed a data-driven model to map stellar parameters (Teff, $\mathrm{log}g$ , and $\left[\mathrm{Fe}/{\rm{H}}\right]$ ) accurately and precisely to broadband stellar photometry. This model must, and does, simultaneously constrain the passband-specific dust reddening vector in the Milky Way, R. The model uses a neural network to le…
Ultracool Dwarfs Observed with the Spitzer Infrared Spectrograph. I. An Accurate Look at the L-to-T Transition at 300 Myr from Optical Through Mid-infrared Spectrophotometry
Metchev, Stanimir; Marley, Mark S.; Saumon, Didier +2 more
We present Spitzer IRS 5-14 µm spectra and 16 µm and 22 µm photometry of the T2.5 companion to the ~300 Myr old G0V star HN Peg. We incorporate previous 0.8-5 µm observations to obtain the most comprehensive spectral energy distribution (SED) of an intermediate-gravity L/T-transition dwarf that, together with an accurate Ga…
Super-Eddington accretion on to a stellar mass ultraluminous X-ray source NGC 4190 ULX1
Ghosh, T.; Rana, V.
We present the results of high-quality XMM-NEWTON observations of a ultraluminous X-ray source (ULX) in the galaxy NGC 4190. The detection of spectral cutoff in NGC 4190 ULX1 spectra rules out the interpretation of the ULX to be in a standard low/hard canonical accretion state. We report that the high quality EPIC spectra can be better described b…
Electron Energy Interplay in the Geomagnetic Trap Below the Auroral Acceleration Region
Khazanov, George V.; Glocer, Alex; Chu, Mike
This publication addresses the collisional superthermal electron dynamics below the auroral acceleration region (AAR). This region is the portion of an auroral field line with a field aligned electric field that leads to the formation of precipitating monoenergetic keV electron fluxes that produce the discrete auroral displays observable from the …
Solar Orbiter Radio and Plasma Waves - Time Domain Sampler: In-flight performance and first results
Maksimovic, M.; Bale, S. D.; Chust, T. +20 more
Context. The Radio and Plasma Waves (RPW) instrument on board Solar Orbiter has been operating nearly continuously since the launch in February 2020. The Time Domain Sampler (TDS) receiver of the RPW instrument is dedicated to waveform measurements of plasma waves and dust impact signatures in an intermediate frequency range from 0.2 to 200 kHz. <…
Hubble Frontier Field Clusters and Their Parallel Fields: Photometric and Photometric Redshift Catalogs
Mobasher, Bahram; Davidzon, I.; Sánchez, F. J. +1 more
We present a multiband analysis of the six Hubble Frontier Field clusters and their parallel fields, producing catalogs with measurements of source photometry and photometric redshifts. We release these catalogs to the public along with maps of intracluster light and models for the brightest galaxies in each field. This rich data set covers a wave…
Low star formation efficiency due to turbulent adiabatic compression in the Taffy bridge
Braine, J.; Schneider, B.; Vollmer, B. +1 more
The Taffy system (UGC 12914/15) consists of two massive spiral galaxies that had a head-on collision about 20 Myr ago. It represents an ideal laboratory for studying the reaction of the interstellar medium (ISM) to a high-speed (∼1000 km s−1) gas-gas collision. New sensitive, high-resolution (2.7″ or ∼800 pc) CO(1−0) observations of the…
The Eris/Dysnomia system I: The orbit of Dysnomia
Buie, M. W.; Grundy, W. M.; Holler, B. J. +1 more
We present new results on the Eris/Dysnomia system including analysis of new images from the WFC3 instrument on the Hubble Space Telescope (HST). Seven HST orbits were awarded to program 15171 in January and February 2018, with the intervals between observations selected to sample Dysnomia over a full orbital period. Using relative astrometry of E…
Peeking Between the Pulses: The Far-UV Spectrum of the Previously Unseen White Dwarf in AR Scorpii
Garnavich, Peter; Littlefield, Colin; Lyutikov, Maxim +1 more
The compact object in the interacting binary AR Sco has widely been presumed to be a rapidly rotating, magnetized white dwarf (WD), but it has never been detected directly. Isolating its spectrum has proven difficult because the spin-down of the WD generates pulsed synchrotron radiation that far outshines the WD's photosphere. As a result, a previ…
An XMM-Newton study of active-inactive galaxy pairs
Guainazzi, Matteo; Paragi, Zsolt; Bianchi, Stefano +8 more
While theory and simulations indicate that galaxy mergers play an important role in the cosmological evolution of accreting black holes and their host galaxies, samples of active galactic nuclei (AGNs) in galaxies at close separations are still small. In order to increase the sample of AGN pairs, we undertook an archival project to investigate the…