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JOYS+: Mid-infrared detection of gas-phase SO2 emission in a low-mass protostar. The case of NGC 1333 IRAS 2A: Hot core or accretion shock?
Chen, Y.; van Dishoeck, E. F.; Nazari, P. +18 more
Context. Thanks to the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST), our ability to observe the star formation process in the infrared has greatly improved. Due to its unprecedented spatial and spectral resolution and sensitivity in the mid-infrared, JWST/MIRI can see through highly extincted protostellar envelopes and p…
The IACOB project: XII. New grid of northern standards for the spectral classification of B-type stars
Simón-Díaz, S.; de Burgos, A.; Negueruela, I. +2 more
Context. With the advent of large spectroscopic surveys, automated stellar parameter determination has become commonplace. Nevertheless, spectral classification still offers a quick and useful alternative for obtaining parameter estimates for large samples of spectra of varying quality. Aims. We present a new atlas of stellar spectra covering the …
CHEX-MATE: Turbulence in the intra-cluster medium from X-ray surface brightness fluctuations
Pointecouteau, E.; Pratt, G. W.; Rossetti, M. +15 more
The intra-cluster medium is prone to turbulent motion that will contribute to the non-thermal heating of the gas, complicating the use of galaxy clusters as cosmological probes. Indirect approaches can estimate the intensity and structure of turbulent motions by studying the associated fluctuations in gas density and X-ray surface brightness. In t…
Evidence of extended [CII] and dust emission in local dwarf galaxies
Ginolfi, M.; Shivaei, I.; Jones, G. C. +8 more
Aims: The evolution of dwarf galaxies is dramatically affected by gaseous and dusty outflows, which can easily deprive their interstellar medium of the material needed for the formation of new stars, simultaneously enriching their surrounding circumgalactic medium (CGM). In this Letter, we present the first evidence of extended [CII] 158 &mic…
Warp and flare of the old Galactic disc as traced by the red clump stars
Ganesh, Shashikiran; Schultheis, Mathias; Uppal, Namita
Our study aims to investigate the outer disc structure of the Milky Way Galaxy using the red clump (RC) stars. We analysed the distribution of the largest sample of RC stars to date, homogeneously covering the entire Galactic plane in the range of 40° ≤ ℓ ≤ 340° and -10° ≤ b ≤ +10°. This sample allows us to model the RC star distribution in the Ga…
JWST Imaging of the Closest Globular Clusters. II. Discovery of Brown Dwarfs in NGC 6397 and Measurement of Age from the Brown Dwarf Cooling Sequence, Using SANDee—A New Grid of Model Isochrones across the Hydrogen-burning Limit
Anderson, Jay; Burgasser, Adam J.; Bedin, Luigi R. +4 more
Globular clusters contain vast repositories of metal-poor stars that represent some of the oldest stellar generations in the Universe. The archaeological footprint of early Galactic evolution may be retained in the measurable properties of globular clusters, such as their ages, mass functions, and chemical abundances. Until recently, all photometr…
PDRs4All. VI. Probing the photochemical evolution of PAHs in the Orion Bar using machine learning techniques
Hartigan, Patrick; Zhang, Yong; Onaka, Takashi +22 more
Context. Extraordinary observations of the Orion Bar by JWST have shown, for the first time, the incredible richness of polycyclic aromatic hydrocarbon (PAH) emission bands and their variation on very small scales. These variations are the result of photochemical evolution of the PAH carrier.
Aims: We aim to probe the photochemical evolution …
Euclid preparation. XLVIII. The pre-launch Science Ground Segment simulation framework
Altieri, B.; Aussel, H.; Cimatti, A. +274 more
Context. The European Space Agency's Euclid mission is one of a raft of forthcoming large-scale cosmology surveys that will map the large-scale structure in the Universe with unprecedented precision. The mission will collect a vast amount of data that will be processed and analysed by Euclid's Science Ground Segment (SGS). The development and vali…
Reconstructing Galactic magnetic fields from local measurements for backtracking ultra-high-energy cosmic rays
Enßlin, Torsten; Edenhofer, Gordian; Pavlidou, Vasiliki +2 more
Context. Ultra-high-energy cosmic rays (UHECRs) are highly energetic charged particles with energies exceeding 1018 eV. These energies are far greater than those achieved in Earth-bound accelerators, and identifying their sources and production mechanism can shed light on many open questions in both astrophysics and high-energy physics.…
Observations of the 2022 September 5 Solar Energetic Particle Event at 15 Solar Radii
Mitchell, D. G.; McComas, D. J.; Bale, S. D. +27 more
On 2022 September 5, Parker Solar Probe (Parker) observed a large solar energetic particle (SEP) event at the unprecedented distance of only 15 R S from the Sun. The observations from the Integrated Science Investigation of the Sun (IS⊙IS) obtained over the course of this event are remarkably rich, and an overview is presented here. IS⊙…