Results 61 to 70 of about 441,685 (256)

JWST Imaging of the Closest Globular Clusters—V. The White Dwarfs Cooling Sequence of M4

Astronomische Nachrichten, Volume 346, Issue 2, February 2025.
ABSTRACT We combine infrared (IR) observations collected by the James Webb Space Telescope with optical deep images by the Hubble Space Telescope taken ~20 years earlier to compute proper‐motion membership for the globular cluster (GC) M4 (NGC 6121) along its entire white dwarf (WD) cooling sequence (CS).
Luigi R. Bedin, Mattia Libralato, Maurizio Salaris, Domenico Nardiello, Michele Scalco, Massimo Griggio, Jay Anderson, Pierre Bergeron, Andrea Bellini, Roman Gerasimov, Adam J. Burgasser, Daniel Apai   +11 more
wiley   +1 more source

Amateur Astronomers and the Hubble Space Telescope [PDF]

International Astronomical Union Colloquium, 1988
In December 1985 the leaders of major amateur astronomy organizations in the U.S. met with the director and staff of the Space Telescope Science Institute (STScI) at their invitation to discuss the possibility of organizing a program for U.S. citizens who don’t work professionally in astronomy to make use of the Hubble Space Telescope.
openaire   +2 more sources

Krylov Subspace Based FISTA‐Type Methods for Linear Discrete Ill‐Posed Problems

Numerical Linear Algebra with Applications, Volume 32, Issue 1, February 2025.
ABSTRACT Several iterative soft‐thresholding algorithms, such as FISTA, have been proposed in the literature for solving regularized linear discrete inverse problems that arise in various applications in science and engineering. These algorithms are easy to implement, but their rates of convergence may be slow.
Alessandro Buccini, Fei Chen, Mirjeta Pasha, Lothar Reichel   +3 more
wiley   +1 more source

JWST's PEARLS: Transients in the MACS J0416.1−2403 Field

The Astrophysical Journal Supplement Series, 2023
With its unprecedented sensitivity and spatial resolution, the James Webb Space Telescope (JWST) has opened a new window for time-domain discoveries in the infrared.
Haojing Yan, Zhiyuan Ma, Bangzheng Sun, Lifan Wang, Patrick Kelly, José M. Diego, Seth H. Cohen, Rogier A. Windhorst, Rolf A. Jansen, Norman A. Grogin, John F. Beacom, Christopher J. Conselice, Simon P. Driver, Brenda Frye, Dan Coe, Madeline A. Marshall, Anton Koekemoer, Christopher N. A. Willmer, Aaron Robotham, Jordan C. J. D’Silva, Jake Summers, Mario Nonino, Nor Pirzkal, Russell E. Ryan Jr., Rafael Ortiz III, Scott Tompkins, Rachana A. Bhatawdekar, Cheng Cheng, Adi Zitrin, S. P. Willner   +29 more
doaj   +1 more source

The Plasma Proton Environment Within Saturn's F‐G Ring Gap as Observed by the Cassini Plasma Spectrometer Ion Mass Spectrometer During Saturn Orbit Insertion

Journal of Geophysical Research: Space Physics, Volume 130, Issue 2, February 2025.
Abstract We report on the detection of protons and the potential detection of H2+ between Saturn's F and G rings based on Cassini Plasma Spectrometer (CAPS) Ion Mass Spectrometer (IMS) time‐of‐flight (TOF) composition measurements acquired during Saturn Orbit Insertion (SOI) outbound pass. The range in dipole L shell is 2.3 < L < 2.8.
E. C. Sittler Jr., A. K. Woodson, R. E. Johnson, J. F. Cooper, W.‐L. Tseng, S. J. Sturner, D. J. Chornay, H. T. Smith, D. G. Simpson, D. B. Reisenfeld   +9 more
wiley   +1 more source

The Importance of Optical Wavelength Data on Atmospheric Retrievals of Exoplanet Transmission Spectra

The Astronomical Journal
Exoplanet transmission spectra provide rich information about the chemical composition, clouds, and temperature structure of exoplanet atmospheres. Most exoplanet transmission spectra only span infrared wavelengths (≳1 μ m), which can preclude crucial ...
Charlotte Fairman, Hannah R. Wakeford, Ryan J. MacDonald   +2 more
doaj   +1 more source

Simulations of Optical Emissions in Io's Plasma Torus

Journal of Geophysical Research: Space Physics, Volume 130, Issue 1, January 2025.
Abstract The Io plasma torus in Jupiter's magnetosphere, dominated by sulfur and oxygen ions from Io's volcanism, exhibits complex radial and azimuthal structures and significant temporal variability. This study analyzes ground‐based optical emission data from the Dual Imaging Spectrograph on the 3.5 m telescope at Apache Point Observatory (APO).
Edward G. Nerney, Fran Bagenal, Carl Schmidt   +2 more
wiley   +1 more source

The UNCOVER Survey: A First-look HST+JWST Catalog of Galaxy Redshifts and Stellar Population Properties Spanning 0.2 ≲ z ≲ 15

The Astrophysical Journal Supplement Series, 2023
The recent UNCOVER survey with the James Webb Space Telescope (JWST) exploits the nearby cluster A2744 to create the deepest view of our Universe to date by leveraging strong gravitational lensing.
Bingjie Wang, Joel Leja, Ivo Labbé, Rachel Bezanson, Katherine E. Whitaker, Gabriel Brammer, Lukas J. Furtak, John R. Weaver, Sedona H. Price, Adi Zitrin, Hakim Atek, Dan Coe, Sam E. Cutler, Pratika Dayal, Pieter van Dokkum, Robert Feldmann, Danilo Marchesini, Marijn Franx, Natascha Förster Schreiber, Seiji Fujimoto, Marla Geha, Karl Glazebrook, Anna de Graaff, Jenny E. Greene, Stéphanie Juneau, Susan Kassin, Mariska Kriek, Gourav Khullar, Michael Maseda, Lamiya A. Mowla, Adam Muzzin, Themiya Nanayakkara, Erica J. Nelson, Pascal A. Oesch, Camilla Pacifici, Richard Pan, Casey Papovich, David J. Setton, Alice E. Shapley, Renske Smit, Mauro Stefanon, Katherine A. Suess, Edward N. Taylor, Christina C. Williams   +43 more
doaj   +1 more source

Constraints on the Observability of Energetic Neutral Atoms From the Magnetosphere‐Atmosphere Interactions at Callisto and Europa

Journal of Geophysical Research: Space Physics, Volume 130, Issue 1, January 2025.
Abstract We investigate the emission of energetic neutral atoms (ENAs) from the magnetosphere‐atmosphere interactions at Europa and Callisto that may be observed by an ENA imaging instrument. To do so, we combine the draped electromagnetic fields from the AIKEF hybrid model with a tracing tool for the energetic magnetospheric parent ions.
C. Michael Haynes, Tyler Tippens, Sven Simon, Lucas Liuzzo   +3 more
wiley   +1 more source

Zonal and Regional Jupiter Brightness Trends from the Hubble Outer Planet Atmospheres Legacy Program

The Planetary Science Journal
The Hubble Outer Planet Atmospheres Legacy program began in 2014 and has observed Jupiter yearly from 2015 to 2024. Using high spatial resolution imaging from the Hubble Wide Field Camera 3, brightness trends were investigated focusing on the unique UV ...
Amy A. Simon, Michael H. Wong
doaj   +1 more source