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AXES-2MRS: A new all-sky catalogue of extended X-ray galaxy groups
Finoguenov, A.; Tempel, E.; Mamon, G. A. +1 more
Context. Understanding baryonic physics at the galaxy-group level is a prerequisite for cosmological studies of the large-scale structure. One poorly understood aspect of galaxy groups is related to the properties of their hot intragroup medium. The well-studied X-ray groups have strong cool cores by which they were selected, so expanding the sele…
ABYSS. II. Identification of Young Stars in Optical SDSS Spectra and Their Properties
Stassun, Keivan G.; Kounkel, Marina; Hillenbrand, Lynne A. +9 more
We developed a tool that measures equivalent widths of various lines in low-resolution optical spectra, and it was applied to stellar spectra obtained as part of SDSS-V and LAMOST programs. These lines, such as Li I, which directly indicates stellar youth, or optical H I and Ca II, which in emission indicate activity associated with stellar youth,…
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…
Optically quiet, but FUV loud: results from comparing the far-ultraviolet predictions of flare models with TESS and HST
Loyd, R. O. Parke; Jackman, James A. G.; Richey-Yowell, Tyler +1 more
The far-ultraviolet (FUV) flare activity of low-mass stars has become a focus in our understanding of the exoplanet atmospheres and how they evolve. However, direct detection of FUV flares and measurements of their energies and rates are limited by the need for space-based observations. The difficulty of obtaining such observations may push some w…
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.,…
Observing gravitational waves with solar system astrometry
Mentasti, G.; Contaldi, C. R.
The subtle influence of gravitational waves on the apparent positioning of celestial bodies offers novel observational windows [1,2,3,4]. We calculate the expected astrometric signal induced by an isotropic Stochastic Gravitational Wave Background (SGWB) in the short distance limit. Our focus is on the resultant proper motion of Solar System objec…
A Catalog of Early-type Runaway Stars from LAMOST DR8
Wang, Luqian; Liu, Chao; Wu, You +3 more
Runaway stars are OB-type stars ejected from their birthplace with large peculiar velocities. The leading hypothesis addressed in their formation includes the supernova ejection mechanism and the dynamic ejection scenario. Identification of runaway populations is the first step to investigating their formation and evolution. Here we present our wo…
Multiband polarimetric imaging of HD 34700 with SCExAO/CHARIS
Currie, Thayne; Lewis, Briley L.; Uyama, Taichi +5 more
We present Subaru/SCExAO + CHARIS broad-band (JHK) integral field spectroscopy of HD 34700 A in polarized light. CHARIS has the unique ability to obtain polarized integral field images at 22 wavelength channels in broad-band, as the incoming light is first split into different polarization states before passing though the lenslet array. We recover…