Search Publications
Stellar Properties for a Comprehensive Collection of Star-forming Regions in the SDSS APOGEE-2 Survey
Bizyaev, Dmitry; Pan, Kaike; Stassun, Keivan G. +25 more
The Sloan Digital Sky Survey IV APOGEE-2 primary science goal was to observe red giant stars throughout the Galaxy to study its dynamics, morphology, and chemical evolution. The APOGEE instrument, a high-resolution 300-fiber H-band (1.55-1.71 µm) spectrograph, is also ideal to study other stellar populations in the Galaxy, among which are a …
Vertical Structure of the Milky Way Disk with Gaia DR3
Vieira, Katherine; Carraro, Giovanni; Korchagin, Vladimir +1 more
Using a complete sample of about 330,000 dwarf stars, well measured by Gaia DR3, limited to the galactic north and south solid angles |b|<75° and up to a vertical distance of 2 kpc, we analyze the vertical structure of the Milky Way stellar disks, based on projected tangential velocities. From selected subsamples dominated by their correspondin…
Redshift Evolution of the Feedback-Cooling Equilibrium in the Core of 48 SPT Galaxy Clusters: A Joint Chandra-SPT-ATCA Analysis
Filipović, M. D.; Hlavacek-Larrondo, J.; Bleem, L. E. +17 more
We analyze the cooling and feedback properties of 48 galaxy clusters at redshifts 0.4 < z < 1.3 selected from the South Pole Telescope (SPT) catalogs to evolve like the progenitors of massive and well-studied systems at z ~ 0. We estimate the radio power at the brightest cluster galaxy (BCG) location of each cluster from an analysis of Austr…
Discovery and description of two young open clusters in the primordial group of NGC 6871
Casado, Juan; Hendy, Yasser
A primordial group of open clusters containing NGC 6871 is confirmed and described through Gaia DR3 data and the previous literature. It is a star-forming complex containing at least six young open clusters (OCs), including Teutsch 8, FSR 198, and Biurakan 2. Two nearby OCs (Casado 82 and Casado-Hendy 1) are newly identified and studied in detail …
Spectroscopic and evolutionary analyses of the binary system AzV 14 outline paths toward the WR stage at low metallicity
Hamann, W. -R.; Oey, M. S.; Mehner, A. +16 more
Context. The origin of the observed population of Wolf-Rayet (WR) stars in low-metallicity galaxies, such as the Small Magellanic Cloud (SMC), is not yet understood. Standard, single-star evolutionary models predict that WR stars should stem from very massive O-type star progenitors, but these are very rare. On the other hand, binary evolutionary …
Wide Binaries as a Modified Gravity test: prospects for detecting triple-system contamination
Manchanda, Dhruv; Sutherland, Will; Pittordis, Charalambos
Recent studies have shown that velocity differences of very wide binary stars, measured to high precision with GAIA, can provide an interesting test for modified-gravity theories which emulate dark matter; in essence, MOND-like theories (with external field effect included) predict that wide binaries (wider than ~ 7 kAU) should orbit ~ 15% faster …
What does a typical full disc around a post-AGB binary look like?. Radiative transfer models reproducing PIONIER, GRAVITY, and MATISSE data
Min, M.; Van Winckel, H.; Kamath, D. +2 more
Context. Stable circumbinary discs around evolved post-asymptotic giant branch (post-AGB) binary systems composed of gas and dust show many similarities with protoplanetary discs around young stellar objects. These discs can provide constraints on both binary evolution and the formation of macrostructures within circumstellar discs. Here we focus …
Classifying the satellite plane membership of Centaurus A's dwarf galaxies using orbital alignment constraints
Müller, Oliver; Sohn, Sangmo Tony; Pawlowski, Marcel S. +1 more
The flattened, possibly co-rotating plane of satellite galaxies around Centaurus A, if more than a fortuitous alignment, adds to the pre-existing tension between the well-studied Milky Way and M31 planes and the Lambda cold dark matter model of structure formation. It was recently reported that the Centaurus A satellite plane (CASP) may be rotatio…
ALMA Gas-dynamical Mass Measurement of the Supermassive Black Hole in the Red Nugget Relic Galaxy PGC 11179
Ho, Luis C.; Gebhardt, Karl; Barth, Aaron J. +10 more
We present 0.″22-resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations of CO(2-1) emission from the circumnuclear gas disk in the red nugget relic galaxy PGC 11179. The disk shows regular rotation, with projected velocities near the center of 400 km s-1. We assume the CO emission originates from a dynamically cold,…
Investigating the origin of optical and X-ray pulsations of the transitional millisecond pulsar PSR J1023+0038
Campana, S.; Stella, L.; de Martino, D. +21 more
Context. PSR J1023+0038 is the first millisecond pulsar that was ever observed as an optical and UV pulsar. So far, it is the only optical transitional millisecond pulsar. The rotation- and accretion-powered emission mechanisms hardly individually explain the observed characteristics of optical pulsations. A synergistic model, combining these stan…