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X-ray detection of astrospheres around three main-sequence stars and their mass-loss rates
Güdel, M.; Koutroumpa, D.; Lisse, C. M. +3 more
Stellar winds of cool main-sequence stars are difficult to constrain observationally. One way to measure stellar mass-loss rates is to detect the soft X-ray emission from stellar astrospheres produced by charge exchange between heavy ions of the stellar wind and cold neutrals of the interstellar medium surrounding the stars. Here we report detecti…
The spatially resolved star formation history of the dwarf spiral galaxy NGC 5474
Östlin, G.; Cignoni, M.; Tosi, M. +16 more
We study the resolved stellar populations and derive the star formation history of NGC 5474, a peculiar star-forming dwarf galaxy at a distance of ~7 Mpc, using Hubble Space Telescope Advanced Camera for Surveys data from the Legacy Extragalactic UV Survey (LEGUS) programme. We apply an improved colour-magnitude diagram fitting technique based on …
Detection of Contact Binary Candidates Observed By TESS Using the Autoencoder Neural Network
Ding, Xu; Ji, KaiFan; Song, ZhiMing +1 more
A contact binary may be the progenitor of a red nova that eventually produces a merger event and have a cut-off period of around 0.2 days. Therefore, a large number of contact binaries is needed to search for the progenitor of red novae and to study the characteristics of short-period contact binaries. In this paper, we employ the Phoebe program t…
The hydrostatic-to-lensing mass bias from resolved X-ray and optical-IR data
Macías-Pérez, J. F.; Perotto, L.; Pointecouteau, E. +11 more
An accurate reconstruction of galaxy cluster masses is key to use this population of objects as a cosmological probe. In this work we present a study on the hydrostatic-to-lensing mass scaling relation for a sample of 53 clusters whose masses were reconstructed homogeneously in a redshift range between z = 0.05 and 1.07. The M500 mass f…
Unveiling the ice and gas nature of active centaur (2060) Chiron using the James Webb Space Telescope
Villanueva, G. L.; Lunine, J. I.; Stansberry, J. +15 more
Context. (2060) Chiron is a large centaur that has been reported active on multiple occasions at relatively large heliocentric distances, including during aphelion passage. Studies of Chiron's coma during active periods have resulted in the detection of C≡N and CO outgassing. Additionally, Chiron is surrounded by a disk of debris that varies with …
Exploring X-Ray Properties of Low-metallicity Dwarf Galaxies
Satyapal, Shobita; Pfeifle, Ryan W.; Secrest, Nathan J. +3 more
One of the primary outstanding questions in extragalactic astronomy is the formation and early evolution of the supermassive black holes that are seen in nearly every massive galaxy. Low-metallicity dwarf galaxies may offer the most representative local analogs to pristine early galaxies, making them a vital tool in probing black hole seed models …
JWST/NIRCam Narrowband Survey of Paβ Emitters in the Spiderweb Protocluster at z = 2.16
Pérez-González, Pablo G.; Koyama, Yusei; Kodama, Tadayuki +7 more
We report the initial result of our Paβ narrowband imaging on a protocluster with the JWST Near Infrared Camera (NIRCam). As NIRCam enables deep narrowband imaging of rest-frame near-infrared lines at z > 1, we target one of the most studied protoclusters, the Spiderweb protocluster at z = 2.16, in which previous studies have confirmed more tha…
3D-DASH: The Evolution of Size, Shape, and Intrinsic Scatter in Populations of Young and Old Quiescent Galaxies at 0.5 < z < 3
Franx, Marijn; van Dokkum, Pieter; van der Wel, Arjen +13 more
We present a study of the growth of the quiescent galaxy population between 0.5 < z < 3 by tracing the number density and structural evolution of a sample of 4518 old and 583 young quiescent galaxies with log(M ⋆/M ⊙) > 10.4, selected from the COSMOS2020 catalog with complementary Hubble Space Telescope F160W imaging…
Gaia Focused Product Release: A catalogue of sources around quasars to search for strongly lensed quasars
Prusti, T.; Mazeh, T.; Zucker, S. +398 more
Context. Strongly lensed quasars are fundamental sources for cosmology. The Gaia space mission covers the entire sky with the unprecedented resolution of 0.18″ in the optical, making it an ideal instrument to search for gravitational lenses down to the limiting magnitude of 21. Nevertheless, the previous Gaia Data Releases are known to be incomple…
Polarized Light from Massive Protoclusters (POLIMAP). I. Dissecting the Role of Magnetic Fields in the Massive Infrared Dark Cloud G28.37+0.07
Caselli, Paola; Law, Chi-Yan; Henshaw, Jonathan D. +11 more
Magnetic fields may play a crucial role in setting the initial conditions of massive star and star cluster formation. To investigate this, we report SOFIA-HAWC+ 214 µm observations of polarized thermal dust emission and high-resolution GBT-Argus C18O(1-0) observations toward the massive Infrared Dark Cloud (IRDC) G28.37+0.07. Cons…