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Measuring σ 8 using DESI Legacy Imaging Surveys Emission-Line galaxies and Planck CMB lensing, and the impact of dust on parameter inference
Miquel, Ramon; Sanchez, Eusebio; Palanque-Delabrouille, Nathalie +39 more
Measuring the growth of structure is a powerful probe for studying the dark sector, especially in light of the σ 8 tension between primary CMB anisotropy and low-redshift surveys. This paper provides a new measurement of the amplitude of the matter power spectrum, σ 8, using galaxy-galaxy and galaxy-CMB lensing power spectra …
Hinode EIS: Updated In-flight Radiometric Calibration
Del Zanna, G.; Warren, H. P.; Weberg, M. J.
We present an update to the in-flight radiometric calibration of the Hinode Extreme Ultraviolet Imaging Spectrometer (EIS), revising and extending our previous studies. We analyze full-spectral EIS observations of quiet Sun (QS) and active regions (ARs) from 2007 until 2022. Using CHIANTI version 10, we adjust the EIS relative effective areas for …
Discovery of polarized X-ray emission from the accreting millisecond pulsar SRGA J144459.2–604207
Coti Zelati, Francesco; Salmi, Tuomo; Papitto, Alessandro +22 more
We report the discovery of polarized X-ray emission from an accreting millisecond pulsar. During a 10-day-long coverage of the February 2024 outburst of SRGA J144459.2‑604207, the Imaging X-ray Polarimetry Explorer (IXPE) detected an average polarization degree of the 2–8 keV emission of 2.3%±0.4% at an angle of 59° ±6° (east of north; the uncerta…
Ohm's Law, the Reconnection Rate, and Energy Conversion in Collisionless Magnetic Reconnection
Phan, Tai; Cassak, Paul A.; Hoshino, Masahiro +12 more
Magnetic reconnection is a ubiquitous plasma process that transforms magnetic energy into particle energy during eruptive events throughout the universe. Reconnection not only converts energy during solar flares and geomagnetic substorms that drive space weather near Earth, but it may also play critical roles in the high energy emissions from the …
Dynamical confirmation of a black hole in the X-ray transient Swift J1727.8‑1613
Armas Padilla, M.; Mata Sánchez, D.; Muñoz-Darias, T. +3 more
The X-ray transient Swift J1727.8‑1613 ended its 10-month discovery outburst in June of 2024, when it reached an optical brightness comparable to pre-discovery magnitudes. With the aim of performing a dynamical study, we launched an optical spectroscopy campaign with the GTC telescope. We detected the companion star and constructed its radial velo…
The formation and survival of the Milky Way's oldest stellar disk
Xiang, Maosheng; Huang, Yang; Liu, Jifeng +3 more
It remains a mystery when our Milky Way first formed a stellar disk component that survived and maintained its disk structure from subsequent galaxy mergers. We present a study of the age-dependent structure and star formation rate of the Milky Way's disk using high-α stars with substantial orbital angular momentum that have precise age determinat…
Stream Members Only: Data-driven Characterization of Stellar Streams with Mixture Density Networks
Bovy, Jo; Bonaca, Ana; Webb, Jeremy J. +4 more
Stellar streams are sensitive probes of the Milky Way's gravitational potential. The mean track of a stream constrains global properties of the potential, while its fine-grained surface density constrains galactic substructure. A precise characterization of streams from potentially noisy data marks a crucial step in inferring galactic structure, i…
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Carenza, Pierluca; Mastrototaro, Leonardo; Balaji, Shyam +1 more
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Exploring Simple-population and Multiple-population Globular Clusters in the Outer Galactic Halo Using the Hubble Space Telescope
Milone, A. P.; Cordoni, G.; Marino, A. F. +13 more
The pseudo two-color diagram, known as chromosome map (ChM), is a valuable tool for identifying globular clusters (GCs), which consist of single or multiple stellar populations (MPs). Recent surveys of Galactic GCs using ChMs have provided stringent observational constraints on the formation of GCs and their stellar populations. However, these sur…
Forward modeling fluctuations in the DESI LRGs target sample using image simulations
Juneau, S.; Moustakas, J.; Brooks, D. +50 more
We use the forward modeling pipeline, Obiwan, to study the imaging systematics of the Luminous Red Galaxies (LRGs) targeted by the Dark Energy Spectroscopic Instrument (DESI). Imaging systematics refers to the false fluctuation of galaxy densities due to varying observing conditions and astrophysical foregrounds corresponding to the imaging survey…