Search Publications
REQUIEM-2D Methodology: Spatially Resolved Stellar Populations of Massive Lensed Quiescent Galaxies from Hubble Space Telescope 2D Grism Spectroscopy
Mahler, Guillaume; Bezanson, Rachel; Brammer, Gabriel +13 more
We present a novel Bayesian methodology to jointly model photometry and deep Hubble Space Telescope 2D grism spectroscopy of high-redshift galaxies. Our requiem2d code measures both unresolved and resolved stellar populations, ages, and star formation histories (SFHs) for the ongoing REsolving QUIEscent Magnified (REQUIEM) Galaxies Survey, which t…
Interplanetary Protons versus Interacting Protons in the 2017 September 10 Solar Eruptive Event
Jin, Meng; Heber, Bernd; Vainio, Rami +11 more
We analyze the relativistic proton emission from the Sun during the eruptive event on 2017 September 10, which caused a ground-level enhancement (GLE 72) registered by the worldwide network of neutron monitors. Using the neutron monitor data and interplanetary transport modeling both along and across interplanetary magnetic field (IMF) lines, we d…
Supercatastrophic Disruption of Asteroids in the Context of SOHO Comet, Fireball, and Meteor Observations
Ye, Quanzhi; Brown, Peter; Clark, David +5 more
Granvik et al. reported an absence of asteroids on orbits with perihelia near the Sun that they attribute to the "supercatastrophic disruption" of these bodies. Here we investigate whether there is evidence for this process among other bodies with similarly low perihelia: near-Earth asteroids, Solar and Heliospheric Observatory (SOHO) comets, and …
Experimental Investigation of Oxidation of Pyroxene and Basalt: Implications for Spectroscopic Analyses of the Surface of Venus and the Ages of Lava Flows
Filiberto, J.; Cutler, K. S.; Treiman, A. H. +1 more
Alteration of basalt on the surface of Venus should be dominated by nanophase hematite and sulfate coatings, but the timescale of oxidation and how that affects spectroscopic measurements has not been extensively studied. The oxidation rate and the effect on reflectance spectroscopy are needed to constrain the age of lava flows with high emissivit…
Progenitor properties of type II supernovae: fitting to hydrodynamical models using Markov chain Monte Carlo methods
González-Gaitán, S.; Folatelli, G.; Anderson, J. P. +3 more
Context. The progenitor and explosion properties of type II supernovae (SNe II) are fundamental to understanding the evolution of massive stars. Particular attention has been paid to the initial masses of their progenitors, but despite the efforts made, the range of initial masses is still uncertain. Direct imaging of progenitors in pre-explosion …
Hard X-Ray Emission from an Activated Flux Rope and Subsequent Evolution of an Eruptive Long-duration Solar Flare
Joshi, Bhuwan; Veronig, Astrid M.; Yurchyshyn, V. +2 more
In this paper, we present a comprehensive study of the evolutionary phases of a major M6.6 long duration event with special emphasize on its pre-flare phase. The event occurred in NOAA 12371 on 2015 June 22. A remarkable aspect of the event was an active pre-flare phase lasting for about an hour during which a hot EUV coronal channel was in the bu…
Dippers from the TESS Full-frame Images. I. Results of the First One Year Data and Discovery of a Runaway Dipper
Takita, Satoshi; Hattori, Kohei; Muto, Takayuki +9 more
We present a comprehensive catalog of the dippers—young stellar objects that exhibit episodic dimming—derived from one year's worth of data of the Transiting Exoplanet Survey Satellite (TESS) full-frame images. In the survey, we found 35 dippers using the convolutional neural network, most of them newly discovered. Although these dippers are widel…
VERITAS Discovery of VHE Emission from the Radio Galaxy 3C 264: A Multiwavelength Study
Fortin, P.; Archer, A.; Benbow, W. +67 more
The radio source 3C 264, hosted by the giant elliptical galaxy NGC 3862, was observed with the Very Energetic Radiation Imaging Telescope Array System (VERITAS) between 2017 February and 2019 May. These deep observations resulted in the discovery of very high energy (VHE; E > 100 GeV) γ-ray emission from this active galaxy. An analysis of ∼57 h…
Photometric and kinematic study of the three intermediate age open clusters NGC 381, NGC 2360, and Berkeley 68
Joshi, Y. C.; Maurya, Jayanand
We present UBVRcIc photometric study of three intermediate age open star clusters NGC 381, NGC 2360, and Berkeley 68 (Be 68). We examine the cluster membership of stars using recently released Gaia DR2 proper motions and obtain a total of 116, 332, and 264 member stars in these three clusters. The mean reddening of E(B - V) =…
Multiwavelength Polarimetry of the Filamentary Cloud IC 5146. II. Magnetic Field Structures
Wang, Jia-Wei; Lai, Shih-Ping; Eswaraiah, Chakali +4 more
The IC 5146 cloud is a nearby star-forming region in Cygnus, consisting of molecular gas filaments in a variety of evolutionary stages. We used optical and near-infrared polarization data toward the IC 5146 cloud, reported in the first paper of this series, to reveal the magnetic fields in this cloud. Using the newly released Gaia data, we found t…