Search Publications
The Core Starbursts of the Galaxy NGC 3628: Radio Very Long Baseline Interferometry and X-Ray Studies
Yang, Xiaolong; Ou, Ziwei
We present radio very long baseline interferometry (VLBI) and X-ray studies of the starburst galaxy NGC 3628. The VLBI observation at 1.5 GHz reveals seven compact (0.7-7 pc) radio sources in the central ~250 pc region of NGC 3628. Based on their morphology, high radio-brightness temperatures (105-107 K), and steep radio spec…
A Statistical Analysis of Deflection of Coronal Mass Ejections in the Field of View of LASCO Coronagraphs
Gopalswamy, Nat; Yashiro, Seiji; Michalek, Grzegorz +1 more
Coronal mass ejections (CMEs) can generate the most severe geomagnetic disturbances. One of the most critical factors affecting a CME's geoeffectiveness is its trajectory. It is crucial to determine whether and when CME will hit Earth. It is commonly assumed that CMEs experience a deflection of propagation in the corona and in interplanetary space…
A Search for Stellar Siblings of the 200 Myr TOI-251 b Planetary System
Kraus, Adam L.; Barber, Madyson G.; Mann, Andrew W. +4 more
Young planets (<1 Gyr) are helpful for studying the physical processes occurring at the early stage of planet evolution. TOI-251 b is a recently discovered sub-Neptune orbiting a young G dwarf, which has an imprecise age estimation of 40-320 Myr. We select TOI-251 sibling candidates based on kinematics and spatial proximity to TOI-251 and furth…
Fast Outflowing Warm Absorbers in Narrow-line Seyfert 1 Galaxy PG 1001+054 Revealed by HST/COS Spectra
Wang, Junfeng; Zhang, Zhi-Xiang; Fu, Xiao-Dan +1 more
Narrow-line Seyfert 1 (NLS1) galaxies are an important type of active galactic nucleus (AGN), generally expected to be accreting at a high Eddington rate. The properties of their outflows and importance of AGN feedback remain intriguing. We report on the discovery of fast outflowing warm absorbers (WAs) in the NLS1 PG 1001+054 with velocities in t…
Drop in the Hard Pulsed Fraction and a Candidate Cyclotron Line in IGR J16320-4751 Seen by NuSTAR
Rahoui, F.; Tomsick, J. A.; Rodriguez, J. +10 more
We report on a timing and spectral analysis of a 50 ks NuSTAR observation of IGR J16320-4751 (= AX J1631.9-4752), a high-mass X-ray binary hosting a slowly rotating neutron star. In this observation from 2015, the spin period was 1308.8 ± 0.4 s giving a period derivative $\dot{P}\sim 2\times {10}^{-8}$ s s-1 when compared with the perio…
X-Rays Trace the Volatile Content of Interstellar Objects
Wang, Q. Daniel; Cabot, Samuel H. C.; Seligman, Darryl Z.
The nondetection of a coma surrounding 1I/'Oumuamua, the first discovered interstellar object (ISO), has prompted a variety of hypotheses to explain its nongravitational acceleration. Given that forthcoming surveys are poised to identify analogs of this enigmatic object, it is prudent to devise alternative approaches to characterization. In this s…
A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km s-1 Mpc-1 Uncertainty from the Hubble Space Telescope and the SH0ES Team
Casertano, Stefano; Filippenko, Alexei V.; Jones, David O. +15 more
We report observations from the Hubble Space Telescope (HST) of Cepheid variables in the host galaxies of 42 Type Ia supernovae (SNe Ia) used to calibrate the Hubble constant (H 0). These include the complete sample of all suitable SNe Ia discovered in the last four decades at redshift z ≤ 0.01, collected and calibrated from ≥1000 HST o…
The Pantheon+ Analysis: Cosmological Constraints
Filippenko, Alexei V.; Coulter, David A.; Foley, Ryan J. +45 more
We present constraints on cosmological parameters from the Pantheon+ analysis of 1701 light curves of 1550 distinct Type Ia supernovae (SNe Ia) ranging in redshift from z = 0.001 to 2.26. This work features an increased sample size from the addition of multiple cross-calibrated photometric systems of SNe covering an increased redshift span, and im…
The Pantheon+ Analysis: The Full Data Set and Light-curve Release
Filippenko, Alexei V.; Kilpatrick, Charles D.; Coulter, David A. +27 more
Here we present 1701 light curves of 1550 unique, spectroscopically confirmed Type Ia supernovae (SNe Ia) that will be used to infer cosmological parameters as part of the Pantheon+ SN analysis and the Supernovae and H 0 for the Equation of State of dark energy distance-ladder analysis. This effort is one part of a series of works that …
Two Remarkably Luminous Galaxy Candidates at z ≈ 10-12 Revealed by JWST
Strait, Victoria; van Dokkum, Pieter; Conroy, Charlie +22 more
The first few 100 Myr at z > 10 mark the last major uncharted epoch in the history of the universe, where only a single galaxy (GN-z11 at z ≈ 11) is currently spectroscopically confirmed. Here we present a search for luminous z > 10 galaxies with JWST/NIRCam photometry spanning ≈1-5 µm and covering 49 arcmin2 from the public…