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The origin of large emission line widths in massive galaxies at redshifts z 3-4
Papovich, C.; Glazebrook, K.; Kacprzak, G. G. +5 more
We present a sample of 22 massive galaxies with stellar masses >1010 M⊙ at 3 < z < 4 with deep H and K-band high resolution spectra (R = 3500-3000) from Keck/MOSFIRE and VLT/KMOS near-infrared spectrographs. We find a large fraction have strong [O III] 5007 and Hβ emission lines with large line widths (σ 100-450 km s…
Absorption of Millimeter-band CO and CN in the Early Universe: Molecular Clouds in the Radio Galaxy B2 0902+34 at Redshift 3.4
Lehnert, Matthew D.; Morganti, Raffaella; Villar-Martín, Montserrat +9 more
Using the Karl G. Jansky Very Large Array, we have detected absorption lines due to carbon monoxide, CO(J = 0 → 1), and the cyano radical, CN(N = 0 → 1), associated with radio galaxy B2 0902+34 at redshift z = 3.4. The detection of millimeter-band absorption observed 1.5 Gyr after the Big Bang facilitates studying molecular clouds down to gas mass…
Detailed chemical abundances of the globular cluster Terzan 6 in the inner bulge
Dalessandro, E.; Massari, D.; Rich, R. M. +7 more
We used near-infrared spectroscopy at medium-high resolution (R = 8000 − 25 000) to perform the first comprehensive chemical study of the intermediate luminosity bulge globular cluster Terzan 6. We derived detailed abundances and abundance patterns of 27 giant stars, likely members of Terzan 6, based on their accurate Hubble Space Telescope proper…
Comparing SCUBA-2 and ALMA Selections of Faint Dusty Star-forming Galaxies in A2744
Barger, A. J.; Cowie, L. L.; McKay, S. J.
We make a comparison of deep SCUBA-2 450 and 850 µm imaging on the massive lensing cluster field A2744 with Atacama Large Millimeter/submillimeter Array (ALMA) 1.2 mm data. Our primary goal is to assess how effective the wider-field SCUBA-2 sample, in combination with red JWST priors, is for finding faint dusty star-forming galaxies (DSFGs) …
Seismic differences between solar magnetic cycles 23 and 24 for low-degree modes
García, R. A.; Mathur, S.; Salabert, D. +4 more
Solar magnetic activity follows regular cycles of about 11 years with an inversion of polarity in the poles every ∼22 years. This changing surface magnetism impacts the properties of the acoustic modes. The acoustic mode frequency shifts are a good proxy of the magnetic cycle. In this Letter we investigate solar magnetic activity cycles 23 and 24 …
Ultraviolet spectroscopy of the supernova Ia hypervelocity runaway white dwarf J0927‑6335
El-Badry, Kareem; Gänsicke, Boris T.; Shen, Ken J. +1 more
The hot white dwarf (WD) J0927‑6335 (Gaia DR3 5250394728194220800 with an effective temperature of Teff = 60 000 K and a surface gravity of logg = 7) was detected as the fastest known Galactic hypervelocity star with a space velocity of ≈2800 km s‑1 and an atmosphere dominated by carbon and oxygen. It is thought to be the sur…
WISDOM Project - XIX. Figures of merit for supermassive black hole mass measurements using molecular gas and/or megamaser kinematics
Williams, Thomas G.; Cappellari, Michele; Davis, Timothy A. +7 more
The mass (MBH) of a supermassive black hole (SMBH) can be measured using spatially resolved kinematics of the region where the SMBH dominates gravitationally. The most reliable measurements are those that resolve the smallest physical scales around the SMBHs. We consider here three metrics to compare the physical scales probed by kinema…
Observed epochal variations in X-ray lines from the O supergiant ζ Puppis do not require substantial changes in the wind mass flux
Huenemoerder, David P.; Miller, Nathan A.; Pradhan, Pragati +2 more
We fit the high-resolution Chandra X-ray spectra of the O supergiant ζ Puppis using the variable boundary condition (VBC) line model to test the stability of its mass-loss rate between two epochs of observation: 2000 March and 2018 July - 2019 August. At issue is whether the observed variations are induced by global changes in the cool (unshocked)…
CONGRUENTS (COsmic-ray, Neutrino, Gamma-ray and Radio Non-Thermal Spectra) - II. Population-level correlations between galactic infrared, radio, and γ-ray emission
Thompson, Todd A.; Krumholz, Mark R.; Crocker, Roland M. +1 more
Galaxies obey a number of empirical correlations between their radio, γ-ray, and infrared emission, but the physical origins of these correlations remain uncertain. Here, we use the CONGRUENTS model for broad-band non-thermal emission from star-forming galaxies, which self-consistently calculates energy-dependent transport and non-thermal emission…
Open superclusters. I. The most populated primordial groups of open clusters in the third quadrant of the Galactic disk
Casado, Juan; Hendy, Yasser
We define an open supercluster (OSC) as a cluster of at least six open clusters (OCs) born from the same giant molecular cloud (GMC). We surveyed the recent catalogs of OCs based on Gaia data and relevant literature to find 17 OSCs of the third Galactic quadrant, along with 190 likely members of them. OSCs are frequent enough to be considered an e…