Search Publications
Wide-binary Stars Formed in the Turbulent Interstellar Medium
Hwang, Hsiang-Chih; Xu, Siyao; Hamilton, Chris +1 more
The ubiquitous interstellar turbulence regulates star formation and the scaling relations between the initial velocity differences and the initial separations of stars. We propose that the formation of wide binaries with initial separations r in the range ~103 au ≲ r ≲ 105 au is a natural consequence of star formation in the …
Redshift Evolution of the Feedback-Cooling Equilibrium in the Core of 48 SPT Galaxy Clusters: A Joint Chandra-SPT-ATCA Analysis
Filipović, M. D.; Hlavacek-Larrondo, J.; Bleem, L. E. +17 more
We analyze the cooling and feedback properties of 48 galaxy clusters at redshifts 0.4 < z < 1.3 selected from the South Pole Telescope (SPT) catalogs to evolve like the progenitors of massive and well-studied systems at z ~ 0. We estimate the radio power at the brightest cluster galaxy (BCG) location of each cluster from an analysis of Austr…
ALMA Gas-dynamical Mass Measurement of the Supermassive Black Hole in the Red Nugget Relic Galaxy PGC 11179
Ho, Luis C.; Gebhardt, Karl; Barth, Aaron J. +10 more
We present 0.″22-resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations of CO(2-1) emission from the circumnuclear gas disk in the red nugget relic galaxy PGC 11179. The disk shows regular rotation, with projected velocities near the center of 400 km s-1. We assume the CO emission originates from a dynamically cold,…
On the Connection between Rieger-type and Magneto-Rossby Waves Driving the Frequency of the Large Solar Eruptions during Solar Cycles 19-25
Korsós, Marianna B.; Liu, Jiajia; Erdélyi, Robertus +2 more
Global solar activity variation mainly occurs over about an 11 yr cycle. However, both longer and shorter periodicities than the solar cycle are also present in many different solar activity indices. The longer timescales may be up to hundreds of years, while the shorter timescales for global solar variability could be within 0.5-2 yr, which inclu…
Membership Analysis and 3D Kinematics of the Star-forming Complex around Trumpler 37 Using Gaia-DR3
Jose, Jessy; Das, Swagat R.; Gupta, Saumya +2 more
Identifying and characterizing young populations of star-forming regions are crucial to unraveling their properties. In this regard, Gaia-DR3 data and machine-learning tools are very useful for studying large star-forming complexes. In this work, we analyze the ~7.1 deg2 area of one of our Galaxy's dominant feedback-driven star-forming …
Varstrometry for Off-nucleus and Dual Subkiloparsec Active Galactic Nuclei (VODKA): Investigating the Nature of SDSS J0823+2418 at z = 1.81, A Likely Lensed Quasar
Shen, Yue; Oguri, Masamune; Zakamska, Nadia L. +8 more
Dual quasars at small physical separations are an important precursor phase of galaxy mergers, ultimately leading to the coalescence of the two supermassive black holes. Starting from a sample of dual and/or lensed quasar candidates discovered using astrometric jitter in Gaia data, we present a pilot case study of one of the most promising yet puz…
Modeling the Multiwavelength Evolution of the V960 Mon System
Sitko, Michael; Russell, Ray W.; Hillenbrand, Lynne A. +7 more
We study the evolution of the FU Ori object V960 Mon since its outburst, using available multiwavelength photometric time series over 8 yr, complemented by several epochs of moderate-dispersion spectrophotometry. We find that the source fading can be well-described by a decrease in the temperature of the inner disk, which results from a combinatio…
The Mid-infrared Molecular Inventory toward Orion IRc2
Drozdovskaya, Maria N.; Herbst, Eric; Acharyya, Kinsuk +8 more
We present the first high spectral resolution mid-infrared survey in the Orion BN/KL region, covering 7.2–28.3 µm. With SOFIA/EXES, we target the enigmatic source Orion IRc2. While this is in the most prolifically studied massive star-forming region, longer wavelengths and molecular emission lines dominated previous spectral surveys. The mid…
Parker Solar Probe Encounters the Leg of a Coronal Mass Ejection at 14 Solar Radii
Mitchell, D. G.; McComas, D. J.; Bale, S. D. +14 more
We use Parker Solar Probe (PSP) observations to report the first direct measurements of the particle and field environments while crossing the leg of a coronal mass ejection (CME) very close to the Sun (~14 Rs). An analysis that combines imaging from 1 au and PSP with a CME model, predicts an encounter time and duration that correspond to an unusu…
The Roles of Morphology and Environment on the Star Formation Rate-Stellar Mass Relation in COSMOS from 0 < z < 3.5
Kartaltepe, Jeyhan S.; Koekemoer, Anton M.; Peng, Ying-jie +6 more
We investigate the relationship between environment, morphology, and the star formation rate (SFR)-stellar mass relation derived from a sample of star-forming (SF) galaxies (commonly referred to as the "star formation main sequence", SFMS) in the COSMOS field from 0 < z < 3.5. We constructed and fit the far-UV-far-IR spectral energy distribu…