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Microlensing Optical Depth and Event Rate toward the Large Magellanic Cloud Based on 20 yr of OGLE Observations
Udalski, Andrzej; Mróz, Przemek; Szymański, Michał K. +14 more
Measurements of the microlensing optical depth and event rate toward the Large Magellanic Cloud (LMC) can be used to probe the distribution and mass function of compact objects in the direction toward that galaxy—in the Milky Way disk, the Milky Way dark matter halo, and the LMC itself. The previous measurements, based on small statistical samples…
The epoch of the Milky Way's bar formation: dynamical modelling of Mira variables in the nuclear stellar disc
Smith, Leigh C.; Matsunaga, Noriyuki; Minniti, Dante +4 more
A key event in the history of the Milky Way is the formation of the bar. This event affects the subsequent structural and dynamical evolution of the entire Galaxy. When the bar formed, gas was likely rapidly funnelled to the centre of the Galaxy settling in a star-forming nuclear disc. The Milky Way bar formation can then be dated by considering t…
Insights from HST into Ultramassive Galaxies and Early-Universe Cosmology
Kamionkowski, Marc; Muñoz, Julian B.; Sabti, Nashwan
The early-science observations made by the James Webb Space Telescope (JWST) have revealed an excess of ultramassive galaxy candidates that appear to challenge the standard cosmological model (Λ CDM ). Here, we argue that any modifications to Λ CDM that can produce such ultramassive galaxies in the early Universe would also affect the UV galaxy lu…
JWST UNCOVER: the overabundance of ultraviolet-luminous galaxies at z > 9
Nanayakkara, Themiya; van Dokkum, Pieter; Fujimoto, Seiji +20 more
Over the past year, JWST has uncovered galaxies at record-breaking distances up to z ~ 13. The JWST UNCOVER (ultra-deep NIRSpec and NIRcam observations before the epoch of reionization) program has obtained ultra-deep multiwavelength NIRCam imaging of the massive galaxy cluster A2744 over ~45 arcmin2 down to ~29.5 AB mag. Here, we prese…
MINDS: The JWST MIRI Mid-INfrared Disk Survey
Henning, Thomas; Waters, L. B. F. M.; Östlin, Göran +43 more
The study of protoplanetary disks has become increasingly important with the Kepler satellite finding that exoplanets are ubiquitous around stars in our galaxy and the discovery of enormous diversity in planetary system architectures and planet properties. High-resolution near-IR and ALMA images show strong evidence for ongoing planet formation in…
Cosmography with supernova Refsdal through time-delay cluster lensing: Independent measurements of the Hubble constant and geometry of the Universe
Pagano, L.; Grillo, C.; Rosati, P. +1 more
We present new measurements of the values of the Hubble constant, matter density, dark energy density, and dark energy density equation-of-state (EoS) parameters. These results have been obtained from a full strong-lensing analysis of the observed positions of 89 multiple images and 4 measured time delays of the supernova (SN) Refsdal in the Hubbl…
[Ne v] emission from a faint epoch of reionization-era galaxy: evidence for a narrow-line intermediate-mass black hole
Chisholm, J.; Schaerer, D.; Marques-Chaves, R. +16 more
Here, we present high spectral resolution
JWST FRESCO: a comprehensive census of H β + [O III] emitters at 6.8 < z < 9.0 in the GOODS fields
Chisholm, J.; Wuyts, S.; Schaerer, D. +27 more
We present the census of H
An empirical reionization history model inferred from the low-redshift Lyman continuum survey and the star-forming galaxies at z > 8
Koekemoer, Anton M.; Scarlata, Claudia; Langeroodi, Danial +8 more
We present a new analysis of the rest-frame ultraviolet (UV) and optical spectra of a sample of three z > 8 galaxies discovered behind the gravitational lensing cluster RX J2129.4+0009. We combine these observations with z > 7.5 galaxies from the literature, for which similar measurements are available. As already pointed out in other studie…
Tip of the Red Giant Branch Distances with JWST: An Absolute Calibration in NGC 4258 and First Applications to Type Ia Supernova Hosts
Casertano, Stefano; Dolphin, Andrew; Li, Siyang +12 more
The tip of the red giant branch (TRGB) allows for the measurement of precise and accurate distances to nearby galaxies based on the brightest ascent of low-mass red giant branch stars before they undergo the helium flash. With the advent of JWST, there is great promise to utilize the technique to measure galaxy distances out to at least 50 Mpc, si…