Search Publications
The COS-legacy survey of C IV absorbers: properties and origins of the intervening systems
Charlton, Jane C.; Savage, Blair D.; Misawa, Toru +4 more
We present here results from a survey of intervening C IV absorbers at z < 0.16 conducted using 223 sightlines from the Hubble Spectroscopic Legacy Archive. Most systems (83%) out of the total sample of 69 have simple kinematics with 1 or 2 C IV components. In the 22 C IV systems with well constrained H I column densities, the temperatures from…
Acceleration of Ring Current Protons Driven by Magnetosonic Waves: Comparisons of Test Particle Simulations with Quasilinear Calculations
Fu, Song; Ge, Yasong
Wave-particle interactions play important roles in local acceleration and pitch angle scattering loss of charged particle dynamics in astrophysics and space physics, and energy transfer between plasma waves and particles is a key problem in plasma physics. Using full relativistic test particle simulations, we quantitatively evaluate the magnetoson…
Statistical study of electron density turbulence and ion-cyclotron waves in the inner heliosphere: Solar Orbiter observations
Maksimovic, M.; Bale, S. D.; Chust, T. +27 more
Context. The recently released spacecraft potential measured by the RPW instrument on board Solar Orbiter has been used to estimate the solar wind electron density in the inner heliosphere.
Aims: The measurement of the solar wind's electron density, taken in June 2020, has been analysed to obtain a thorough characterization of the turbulence …
Star Formation Histories from Spectral Energy Distributions and Color-magnitude Diagrams Agree: Evidence for Synchronized Star Formation in Local Volume Dwarf Galaxies over the Past 3 Gyr
McQuinn, Kristen B. W.; Johnson, Benjamin D.; Gawiser, Eric +6 more
Star formation histories (SFHs) reveal physical processes that influence how galaxies form their stellar mass. We compare the SFHs of a sample of 36 nearby (D ⪅ 4 Mpc) dwarf galaxies from the ACS Nearby Galaxy Survey Treasury (ANGST), inferred from the color-magnitude diagrams (CMDs) of individually resolved stars in these galaxies, with those rec…
The Deeper, Wider, Faster programme: exploring stellar flare activity with deep, fast cadenced DECam imaging via machine learning
Abbott, T. M. C.; Zhang, J.; Flynn, C. +9 more
We present our 500 pc distance-limited study of stellar flares using the Dark Energy Camera as part of the Deeper, Wider, Faster programme. The data were collected via continuous 20-s cadence g-band imaging and we identify 19 914 sources with precise distances from Gaia DR2 within 12, ~3 deg2, fields over a range of Galactic latitudes. …
Long-term X-ray variability of the symbiotic system RT Cru based on Chandra spectroscopy
Drake, J. J.; Karovska, M.; Danehkar, A. +1 more
RT Cru belongs to the rare class of hard X-ray emitting symbiotics, whose origin is not yet fully understood. In this work, we have conducted a detailed spectroscopic analysis of X-ray emission from RT Cru based on observations taken by the Chandra Observatory using the Low Energy Transmission Grating (LETG) on the High-Resolution Camera Spectrome…
Outbursting Young Stellar Object PGIR 20dci in the Perseus Arm
De, Kishalay; Kasliwal, Mansi M.; Hillenbrand, Lynne A. +9 more
We report the discovery of a likely outbursting Class I young stellar object, associated with the star-forming region NGC 281-W (distance ∼2.8 kpc). The source is currently seen only at infrared wavelengths, appearing in both the Palomar Gattini InfraRed (1.2 µm) and the Near-Earth Object Wide-field Infrared Survey Explorer (3.4 and 4.6 &mic…
Blow-away in the Extreme Low-mass Starburst Galaxy Pox 186
Scarlata, Claudia; Jaskot, Anne; Skillman, Evan +1 more
Pox 186 is an exceptionally small dwarf starburst galaxy hosting a stellar mass of ∼105 M⊙. Undetected in H I (M < 106 M⊙) from deep 21 cm observations and with an [O III]/[O II] (5007/3727) ratio of 18.3 ± 0.11, Pox 186 is a promising candidate Lyman continuum emitter. It may be a possible analog of …
Metal-poor stars observed with the automated planet finder telescope. III. CEMP-no stars are the descendant of population III stars
Zhao, Gang; Mardini, Mohammad K.; Al-Wardat, Mashhoor A. +4 more
This study reports a probabilistic insight into the stellar-mass and supernovae (SNe) explosion energy of five CEMP-no stars' possible progenitors. As such, a direct comparison between the abundance ratios [X/Fe] of the light-elements and the predicted nucleosynthetic yields of SN of high-mass metal-free stars has been performed. This comparison s…
Early science with the Large Millimeter Telescope: a 1.1 mm AzTEC survey of red-Herschel dusty star-forming galaxies
Ivison, R. J.; Omont, A.; Pope, A. +32 more
We present Large Millimeter Telescope (LMT)/AzTEC 1.1 mm observations of ~100 luminous high-redshift dusty star-forming galaxy candidates from the $\sim 600\,$ sq.deg Herschel-ATLAS survey, selected on the basis of their SPIRE red far-infrared colours and with $S_{500\, \mu \rm m}=35-80$ mJy. With an effective $\theta _{\rm FWHM}\approx 9.5\,$arcs…