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Characterization of the Ejecta from the NASA/DART Impact on Dimorphos: Observations and Monte Carlo Models
Licandro, Javier; Kolokolova, Ludmilla; Li, Jian-Yang +26 more
The NASA Double Asteroid Redirection Test (DART) spacecraft successfully crashed on Dimorphos, the secondary component of the binary (65803) Didymos system. Following the impact, a large dust cloud was released, and a long-lasting dust tail developed. We have extensively monitored the dust tail from the ground and the Hubble Space Telescope. We pr…
Terrestrial- and Neptune-mass Free-Floating Planet Candidates from the MOA-II 9 yr Galactic Bulge Survey
Udalski, Andrzej; Mróz, Przemek; Fukui, Akihiko +28 more
We report the discoveries of low-mass free-floating planet (FFP) candidates from the analysis of 2006-2014 MOA-II Galactic bulge survey data. In this data set, we found 6111 microlensing candidates and identified a statistical sample consisting of 3535 high-quality single-lens events with Einstein radius crossing times in the range 0.057 < t
Constraints on Stellar Flare Energy Ratios in the NUV and Optical from a Multiwavelength Study of GALEX and Kepler Flare Stars
Kowalski, Adam F.; Tristan, Isaiah I.; Brasseur, C. E. +1 more
We present a multiwavelength study of stellar flares on primarily G-type stars using overlapping time domain surveys in the near-ultraviolet (NUV) and optical regimes. The NUV (the Galaxy Evolution Explorer; GALEX) and optical (Kepler) wavelength domains are important for understanding energy fractionations in stellar flares, and for constraining …
ALMA Observation of a z ≳ 10 Galaxy Candidate Discovered with JWST
Papovich, Casey; Finkelstein, Steven L.; Santini, Paola +12 more
We report the observation by the Atacama Large Millimeter/submillimeter Array (ALMA) of a z ≳ 10 galaxy candidate (GHZ1) discovered from the GLASS-JWST Early Release Science Program. Our ALMA program aims to detect the [O III] emission line at the rest-frame frequency 3393.0062 GHz (88.36 µm) and far-IR continuum emission with the spectral w…
Cold gas disks in main-sequence galaxies at cosmic noon: Low turbulence, flat rotation curves, and disk-halo degeneracy
Zhang, Zhi-Yu; Lelli, Federico; Bisbas, Thomas G. +6 more
We study the dynamics of cold molecular gas in two main-sequence galaxies at cosmic noon (zC-488879 at z ≃ 1.47 and zC-400569 at z ≃ 2.24) using new high-resolution ALMA observations of multiple 12CO transitions. For zC-400569 we also reanalyze high-quality Hα data from the SINS/zC-SINF survey. We find that (1) both galaxies have regula…
The Dimorphos Boulder Swarm
Mutchler, Max; Jewitt, David; Li, Jing +1 more
We present deep Hubble Space Telescope images taken to examine the ejecta from the DART spacecraft impact into asteroid Dimorphos. The images reveal an extensive population of comoving boulders, the largest of which is ~7 m in diameter (geometric albedo 0.15 assumed). Measurements of 37 boulders show a mean sky-plane velocity dispersion of 0.30 ± …
The phase spiral in Gaia DR3
Katz, D.; Antoja, T.; Bernet, M. +3 more
Aims: We aim to study the phase spiral in the Milky Way (MW) disc with data from the third data release of Gaia (DR3) and use it as an inference tool to decipher the late-time evolution of the Galaxy.
Methods: We used an edge-detection algorithm to find the border of the phase spiral, allowing us to robustly quantify its shape at differe…
The massive relic galaxy NGC 1277 is dark matter deficient. From dynamical models of integral-field stellar kinematics out to five effective radii
Trujillo, Ignacio; Cappellari, Michele; Buitrago, Fernando +7 more
According to the Λ cold dark matter (ΛCDM) cosmology, present-day galaxies with stellar masses M⋆ > 1011 M⊙ should contain a sizable fraction of dark matter within their stellar body. Models indicate that in massive early-type galaxies (ETGs) with M⋆ ≈ 1.5 × 1011 M⊙, dark matter …
Gaia Data Release 3. Reflectance spectra of Solar System small bodies
Prusti, T.; Mazeh, T.; Zucker, S. +444 more
Context. The Gaia mission of the European Space Agency (ESA) has been routinely observing Solar System objects (SSOs) since the beginning of its operations in August 2014. The Gaia data release three (DR3) includes, for the first time, the mean reflectance spectra of a selected sample of 60 518 SSOs, primarily asteroids, observed between August 5,…
Supermassive Black Hole Winds in X-rays: SUBWAYS. I. Ultra-fast outflows in quasars beyond the local Universe
Maiolino, R.; Merloni, A.; Fiore, F. +49 more
We present a new X-ray spectroscopic study of 22 luminous (2 × 1045 ≲ Lbol/erg s−1 ≲ 2 × 1046) active galactic nuclei (AGNs) at intermediate redshifts (0.1 ≲ z ≲ 0.4), as part of the SUpermassive Black hole Winds in the x-rAYS (SUBWAYS) sample, mostly composed of quasars and type 1 AGNs. Here, 17 targets…