Search Publications
The 300 pc Resolution Imaging of a z = 8.31 Galaxy: Turbulent Ionized Gas and Potential Stellar Feedback 600 Million Years after the Big Bang
Inoue, Akio K.; Hashimoto, Takuya; Sugahara, Yuma +16 more
We present the results of 300 pc resolution Atacama Large Millimeter/submillimeter Array imaging of the [O III] 88 µm line and dust continuum emission from a z = 8.312 Lyman-break galaxy MACS0416_Y1. The velocity-integrated [O III] emission has three peaks that are likely associated with three young stellar clumps of MACS0416_Y1, while the c…
Ejecta, Rings, and Dust in SN 1987A with JWST MIRI/MRS
Fox, O. D.; Blommaert, J. A. D. L.; Larsson, J. +31 more
Supernova (SN) 1987A is the nearest supernova in ~400 yr. Using the JWST MIRI Medium Resolution Spectrograph, we spatially resolved the ejecta, equatorial ring (ER), and outer rings in the mid-infrared 12,927 days (35.4 yr) after the explosion. The spectra are rich in line and dust continuum emission, both in the ejecta and the ring. The broad emi…
Magnetic Activity-Rotation-Age-Mass Relations in Late-pre-main-sequence Stars
Garmire, Gordon P.; Feigelson, Eric D.; Getman, Konstantin V.
We study the four-dimensional relationships between magnetic activity, rotation, mass, and age for solar-type stars in the age range 5-25 Myr. This is the late-pre-main-sequence (l-PMS) evolutionary phase when rapid changes in a star's interior may lead to changes in the magnetic dynamo mechanisms. We carefully derive rotational periods and spot s…
Ejecta Evolution Following a Planned Impact into an Asteroid: The First Five Weeks
Bannister, Michele T.; Guillot, Tristan; Abe, Lyu +85 more
The impact of the Double Asteroid Redirection Test spacecraft into Dimorphos, moon of the asteroid Didymos, changed Dimorphos's orbit substantially, largely from the ejection of material. We present results from 12 Earth-based facilities involved in a world-wide campaign to monitor the brightness and morphology of the ejecta in the first 35 days a…
A 3D View of Orion. I. Barnard's Loop
Alves, João; Bally, John; Zucker, Catherine +11 more
Barnard's Loop is a famous arc of Hα emission located in the Orion star-forming region. Here, we provide evidence of a possible formation mechanism for Barnard's Loop and compare our results with recent work suggesting a major feedback event occurred in the region around 6 Myr ago. We present a 3D model of the large-scale Orion region, indicating …
Modeling a Coronal Mass Ejection from an Extended Filament Channel. II. Interplanetary Propagation to 1 au
Scolini, Camilla; Lynch, Benjamin J.; Palmerio, Erika +5 more
We present observations and modeling results of the propagation and impact at Earth of a high-latitude, extended filament channel eruption that commenced on 2015 July 9. The coronal mass ejection (CME) that resulted from the filament eruption was associated with a moderate disturbance at Earth. This event could be classified as a so-called "proble…
A Candidate Relativistic Tidal Disruption Event at 340 Mpc
Chandra, Poonam; Hallinan, Gregg; Laha, Sibasish +13 more
We present observations of an extreme radio flare, VT J024345.70-284040.08, hereafter VT J0243, from the nucleus of a galaxy with evidence for historic Seyfert activity at redshift z = 0.074. Between NRAO Very Large Array (VLA) Sky Survey observations in 1993 to VLA Sky Survey observations in 2018, VT J0243 rose from a ~ GHz radio luminosity of ν …
Reconstructing the XUV Spectra of Active Sun-like Stars Using Solar Scaling Relations with Magnetic Flux
Notsu, Yuta; Namekata, Kosuke; Toriumi, Shin +3 more
The Kepler space telescope and Transiting Exoplanet Survey Satellite unveiled that Sun-like stars frequently host exoplanets. These exoplanets are subject to fluxes of ionizing radiation in the form of X-ray and extreme-ultraviolet (EUV) radiation that may cause changes in their atmospheric dynamics and chemistry. While X-ray fluxes can be observe…
A Highly Magnified Gravitationally Lensed Red QSO at z = 2.5 with a Significant Flux Ratio Anomaly
Djorgovski, S. G.; Stern, Daniel; Lacy, Mark +12 more
We present the discovery of a gravitationally lensed dust-reddened QSO at z = 2.517, identified in a survey for QSOs by infrared selection. Hubble Space Telescope imaging reveals a quadruply lensed system in a cusp configuration, with a maximum image separation of ~1.″8. We find that, compared to the central image of the cusp, the neighboring brig…
Evidence of a Massive Stellar Disruption in the X-Ray Spectrum of ASASSN-14li
Ramirez-Ruiz, Enrico; Drake, Jeremy J.; Raymond, John +7 more
The proximity and duration of the tidal disruption event ASASSN-14li led to the discovery of narrow, blueshifted absorption lines in X-rays and UV. The gas seen in X-ray absorption is consistent with bound material close to the apocenter of elliptical orbital paths, or with a disk wind similar to those seen in Seyfert-1 active galactic nuclei. We …