Results 61 to 70 of about 472 (148)

JWST imaging of the closest globular clusters—I. Possible infrared excess among white dwarfs in NGC 6397

open access: yesAstronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We present James Webb Space Telescope observations of the globular cluster NGC 6397 and use them to extend to infrared wavelengths the characterization of the cluster's entire white dwarf (WD) cooling sequence (CS). The data allows us to probe fundamental astrophysical WD properties and to search for evidence in their colors for (or against ...
L. R. Bedin   +11 more
wiley   +1 more source

Active Galactic Nuclei: Jets as the Source of Hadrons and Neutrinos

open access: yesActa Polytechnica CTU Proceedings, 2014
Active galactic nuclei are extragalactic sources, and their relativistic hot-plasma jets are believed to be the main candidates of the cosmic-ray origin, above the so-called knee region of the cosmic-ray spectrum.
Athina Meli, Paolo Ciarcelluti
doaj   +1 more source

Virgo Filaments. IV. Using WISE to Measure the Modification of Star-forming Disks in the Extended Regions Around the Virgo Cluster

open access: yesThe Astrophysical Journal
Recent theoretical work and targeted observational studies suggest that filaments are sites of galaxy preprocessing. The aim of the WISESize project is to directly probe galaxies over the full range of environments to quantify and characterize extrinsic ...
Kim Conger   +16 more
doaj   +1 more source

JWST Discovery of a Very Fast Biconical Outflow of Warm Molecular Gas in the Nearby Ultraluminous Infrared Galaxy F08572+3915 NW

open access: yesThe Astrophysical Journal
We present new James Webb Space Telescope (JWST) Mid-Infrared Instrument Medium-Resolution Spectrometer observations of the nearby ultraluminous infrared galaxy (ULIRG) F08572+3915 NW. These integral field spectroscopic (IFS) data reveal a kpc-scale warm-
Kylie Yui Dan   +11 more
doaj   +1 more source

LHAASO Observations of Mrk 421 during 2021 March–2024 March: A Comprehensive Very-high-energy Catalog of Multitimescale Outbursts and Its Time-averaged Behavior

open access: yesThe Astrophysical Journal Supplement Series
The Large High Altitude Air Shower Observatory (LHAASO) monitors sources within its field of view for up to 7 hr daily, achieving a duty cycle exceeding 98% and an annual point-source sensitivity of 1.5% Crab units (CU) in the very-high-energy (VHE) band.
Zhen Cao   +327 more
doaj   +1 more source

X-Raying CAMELS: Constraining Baryonic Feedback in the Circumgalactic Medium with the CAMELS Simulations and eRASS X-Ray Observations

open access: yesThe Astrophysical Journal
The circumgalactic medium (CGM) around massive galaxies plays a crucial role in regulating star formation and feedback. Using the Cosmology and Astrophysics with MachinE Learning Simulations (CAMELS) suite, we develop emulators for the X-ray surface ...
Erwin T. Lau   +9 more
doaj   +1 more source

The Era of Kilometer-Scale Neutrino Detectors

open access: yesAdvances in High Energy Physics, 2013
Neutrino astronomy beyond the Sun was first imagined in the late 1950s; by the 1970s, it was realized that kilometer-scale neutrino detectors were required.
Francis Halzen, Uli Katz
doaj   +1 more source

Measuring the Intracluster Light Fraction with Machine Learning

open access: yesThe Astrophysical Journal
The intracluster light (ICL) is an important tracer of a galaxy cluster’s history and past interactions. However, only small samples have been studied to date due to its very low surface brightness and the heavy manual involvement required for the ...
Louisa Canepa   +4 more
doaj   +1 more source

Strong LensIng and Cluster Evolution (SLICE) with JWST: Early Results, Lens Models, and High-redshift Detections

open access: yesThe Astrophysical Journal
We leverage JWST’s superb resolution to derive strong-lensing mass maps of 14 clusters, spanning a redshift range of z  ∼ 0.25–1.06 and a mass range of M _500  ∼ 2–12 × 10 ^14 M _⊙ , from the Strong LensIng and Cluster Evolution (SLICE) JWST program ...
Catherine Cerny   +26 more
doaj   +1 more source

A Pilot Study for the CSST Slitless Spectroscopic Quasar Survey Based on Mock Data

open access: yesThe Astrophysical Journal
The wide survey of the Chinese Space Station Telescope (CSST) will observe a large field of 17,500 deg ^2 . The GU, GV, and GI grism observations of CSST will cover the wavelength range from 2550 to 10000 Å at a resolution of R  ∼ 200 and a depth of ...
Yuxuan Pang   +6 more
doaj   +1 more source

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