Search Publications
Kinematics and Star Formation in the Hub–Filament System G6.55-0.1
Wyrowski, Friedrich; Güsten, Rolf; Ishwara-Chandra, C. H. +2 more
Hub–filament systems (HFSs) being the potential sites of formation of star clusters and high-mass stars, provide a testbed for the current theories that attempt to explain star formation globally. It is thus important to study a large number of HFSs using both intensity and velocity information to constrain these objects better observationally. He…
A Quantification of the Effects Using Different Stellar-population Synthesis Models for Epoch of Reionization
Luo, Rongxin; Han, Yunkun; Liu, Peiai +1 more
The luminosity and spectral energy distribution of high-z galaxies are sensitive to the stellar-population synthesis (SPS) models. In this paper, we study the effects of different SPS models on the measurements of high-z galaxies and the budget of ionizing photons during the epoch of reionization by employing each of them in the semianalytical gal…
Quasi-stars as a Means of Rapid Black Hole Growth in the Early Universe
Begelman, Mitchell C.; Coughlin, Eric R.
JWST observations demonstrate that supermassive black holes (SMBHs) exist by redshifts z ≳ 10, providing further evidence for "direct collapse" black hole (BH) formation, whereby massive (∼103–5 M ⊙) SMBH seeds are generated within a few million years as a byproduct of the rapid inflow of gas into the centers of protogalaxies…
The JWST Resolved Stellar Populations Early Release Science Program. VII. Stress Testing the NIRCam Exposure Time Calculator
Gennaro, Mario; McQuinn, Kristen B. W.; Dolphin, Andrew E. +19 more
We empirically assess estimates from v3.0 of the James Webb Space Telescope NIRCam Exposure Time Calculator (ETC) using observations of resolved stars in Local Group targets taken as part of the Resolved Stellar Populations Early Release Science (ERS) Program. For bright stars, we find that (i) purely Poissonian estimates of the signal-to-noise ra…
All-sky Kinematics and Chemistry of Monoceros Stellar Overdensity
Laporte, Chervin F. P.; Antoja, Teresa; Limberg, Guilherme +7 more
We explore the kinematic and chemical properties of the Monoceros stellar overdensity by combining data from the Two Micron All Sky Survey, Wide-field Infrared Survey Explorer, APOGEE, and Gaia. Monoceros is a structure located toward the Galactic anticenter and close to the disk. We have identified that its stars have azimuthal velocity in the ra…
An HI-absorption-selected Cold Rotating Disk Galaxy at z ≈ 2.193
Prochaska, J. X.; Rafelski, M.; Dutta, R. +3 more
We have used the Atacama Large Millimeter/submillimeter Array to map CO(3–2) emission from a galaxy, DLA-B1228g, associated with the high-metallicity damped Lyα absorber at z ≈ 2.1929 toward the QSO PKS B1228–113. At an angular resolution of ≈0.″32 × 0.″24, DLA-B1228g shows extended CO(3–2) emission with a deconvolved size of ≈0.″78 × 0.″18, i.e.,…
SPYGLASS. V. Spatially and Temporally Structured Star-forming Environments in the Cepheus-Hercules Complex
Kraus, Adam L.; Bouma, Luke G.; Kerr, Ronan +2 more
Young associations record complete histories of star-forming events through their demographics and dynamics, and Gaia has greatly expanded our knowledge of these associations. We present the first structural and dynamical overview study of the Cep-Her Complex, which has recently emerged as the largest stellar population within 500 pc that still la…
An Image-based Search for Pulsar Candidates in the MeerKAT Bulge Survey
Calore, Francesca; Kaplan, David L.; Clavel, Maïca +13 more
We report on the results of an image-based search for pulsar candidates toward the Galactic bulge. We used mosaic images from the MeerKAT radio telescope that were taken as part of a 173 deg2 survey of the bulge and Galactic center of our Galaxy at L band (856–1712 MHz) in all four Stokes I, Q, U, and V. The image rms noise levels of 12…
Observational Evidence for Hot Wind Impact on Parsec Scales in Low-luminosity Active Galactic Nuclei
Li, Zhiyuan; Shi, Fangzheng; Yuan, Feng +2 more
Supermassive black holes in galaxies spend the majority of their lifetime in the low-luminosity regime, powered by hot accretion flow. Strong winds launched from the hot accretion flow have the potential to play an important role in active galactic nuclei (AGN) feedback. Direct observational evidence for these hot winds with temperatures around 10…
Updated Spectral Characteristics for the Ultracool Dwarf TRAPPIST-1
Burgasser, Adam J.; Davoudi, Fatemeh; Rackham, Benjamin V. +5 more
A comprehensive infrared spectroscopic study of star TRAPPIST-1 is a crucial step toward the detailed examination of its planets. While the presence of Earth's atmosphere has limited the spectral extent of such a study up to now, the Near Infrared Imager and Slitless Spectrograph (NIRISS) and the Near Infrared Spectrograph instruments aboard the J…