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Estimate of Water and Hydroxyl Abundance on Asteroid (16) Psyche from JWST Data
Woodward, Charles E.; Rivkin, Andrew S.; Müller, Thomas G. +10 more
Our understanding of solar system evolution is closely tied to interpretations of asteroid composition, particularly the M-class asteroids. These asteroids were initially thought to be the exposed cores of differentiated planetesimals, a hypothesis based on their spectral similarity to iron meteorites. However, recent astronomical observations hav…
A Possible Correlation between Metallicity and Near-IR Color for Late-M and L Dwarfs
Liu, Michael C.; Zhang, Zhoujian; Zhang, Ruihan
We examine the relationship between metallicity and J - K color for 64 benchmark late-M and L dwarfs, all of which are wide companions to higher-mass stars, and six of which are new discoveries. We assess the correlation between the Δ(J - K) color anomaly (the difference in an object's J - K color from the median color for field objects of the sam…
Rapid variability of Markarian 421 during extreme flaring as seen through the eyes of XMM-Newton
Nowak, M. A.; Walter, R.; Dauser, T. +31 more
By studying the variability of blazars across the electromagnetic spectrum, it is possible to resolve the underlying processes responsible for rapid flux increases, so-called flares. We report on an extremely bright X-ray flare in the high-peaked BL Lacertae object Markarian 421 (Mrk 421) that occurred simultaneously with enhanced γ-ray activity d…
H I content at cosmic noon - a millimetre-wavelength perspective
Messias, Hugo; Vioque, Miguel; Guerrero, Andrea +4 more
In order to understand galaxy growth evolution, it is critical to constrain the evolution of its building block: gas. Mostly comprised by Hydrogen in its neutral (H I) and molecular (H
Exploring NGC 2345: A Comprehensive Study of a Young Open Cluster through Photometric and Kinematic Analysis
Belwal, Kuldeep; Bisht, D.; Bisht, Mohit Singh +5 more
We conducted a photometric and kinematic analysis of the young open cluster NGC 2345 using CCD UBV data from 2 m Himalayan Chandra Telescope, Gaia Data Release 3, Two Micron All-Sky Survey, and the Photometric All-Sky Survey data sets. We found 1732 most probable cluster members with membership probability higher than 70%. The fundamental and stru…
The Radcliffe Wave Parameters from Data on Open Star Clusters
Bobylev, V. V.; Bajkova, A. T.
A spectral analysis of the vertical positions and velocities of 374 open star clusters (OSCs) was carried out. We took these OSCs from the Hunt and Reffert catalog; they have an average age of about 10 million years, and are located on the galactic plane XY in a narrow zone inclined by 25° to the galactic axis Y. The following estimates of the par…
On the Heating of the Slow Solar Wind by Imbalanced Alfvén-wave Turbulence from 0.06 to 1 au: Parker Solar Probe and Solar Orbiter Observations
Halekas, Jasper S.; Bourouaine, Sofiane; Perez, Jean C. +3 more
In this work we analyze plasma and magnetic field data provided by the Parker Solar Probe and Solar Orbiter missions to investigate the radial evolution of the heating of Alfvénic slow wind by imbalanced Alfvén-wave (AW) turbulent fluctuations from 0.06 to 1 au. in our analysis we focus on slow solar-wind intervals with highly imbalanced and incom…
Observational properties of active galactic nucleus obscuration during the peak of accretion growth
Sawicki, Marcin; Schramm, Malte; Gwyn, Stephen +11 more
We investigated the gas obscuration and host galaxy properties of active galactic nuclei (AGNs) during the peak of cosmic accretion growth of supermassive black holes at redshift 0.8-1.8 using X-ray-detected AGNs with mid-infrared and far-infrared detection. The sample was classified as type-1 and type-2 AGNs using optical spectral and morphologic…
Energetic Particle Contamination in STIX During Solar Orbiter's Passage Through Earth's Radiation Belts and an Interplanetary Shock
Krucker, Säm; Dresing, Nina; Xiao, Hualin +8 more
The Spectrometer/Telescope for Imaging X-rays (STIX) is a hard X-ray imaging spectrometer on board the ESA and NASA heliospheric mission Solar Orbiter. STIX has been operational for three years and has observed X-ray emission from ~35,000 solar flares. Throughout its lifetime, Solar Orbiter has been frequently struck by a high flux of energetic pa…
Probing Disk Ice Content and Polycyclic Aromatic Hydrocarbon Emission through Multiband MagAO+Clio Images of HD 141569
Weinberger, Alycia J.; Close, Laird M.; Males, Jared R. +4 more
We present resolved images of the inner disk component around HD 141569A using the Magellan adaptive optics system with the Clio2 1-5 µm camera, offering a glimpse of a complex system thought to be in a short evolutionary phase between protoplanetary and debris disk stages. We use a reference star along with the Karhunen-Loéve image projecti…