Search Publications
Detection of a 100,000 M ⊙ black hole in M31's Most Massive Globular Cluster: A Tidally Stripped Nucleus
Pechetti, Renuka; Caldwell, Nelson; Kamann, Sebastian +6 more
We investigate the presence of a central black hole (BH) in B023-G078, M31's most massive globular cluster. We present high-resolution, adaptive-optics assisted, integral-field spectroscopic kinematics from Gemini/NIFS that show a strong rotation (~20 km s-1) and a velocity dispersion rise toward the center (37 km s-1). We co…
Variable star classification across the Galactic bulge and disc with the VISTA Variables in the Vía Láctea survey
Smith, Leigh C.; Belokurov, Vasily; Minniti, Dante +3 more
We present VIVACE, the VIrac VAriable Classification Ensemble, a catalogue of variable stars extracted from an automated classification pipeline for the Vista Variables in the Vía Láctea (VVV) infrared survey of the Galactic bar/bulge and southern disc. Our procedure utilizes a two-stage hierarchical classifier to first isolate likely variable sou…
Blue Rest-frame UV-optical Colors in z 8 Galaxies from GREATS: Very Young Stellar Populations at 650 Myr of Cosmic Time
Illingworth, Garth D.; Labbé, Ivo; van Dokkum, Pieter +4 more
Deep rest-optical observations are required to accurately constrain the stellar populations of z ~ 8 galaxies. Due to significant limitations in the availability of such data for statistically complete samples, observational results have been limited to modest numbers of bright or lensed sources. To revolutionize the present characterization of z …
First eROSITA study of nearby M dwarfs and the rotation-activity relation in combination with TESS
Salvato, M.; Wolf, J.; Stelzer, B. +3 more
We present the first results with the ROentgen Survey with an Imaging Telescope Array (eROSITA) on board the Russian Spektrum-Roentgen-Gamma mission, and we combine the new X-ray data with observations with the Transiting Exoplanet Survey Satellite (TESS). We used the SUPERBLINK proper motion catalog of nearby M dwarfs as input sample to search fo…
Macro and micro structures of pebble-made cometary nuclei reconciled by seasonal evolution
Longobardo, Andrea; Mottola, Stefano; Kappel, David +17 more
Comets evolve due to sublimation of ices embedded inside porous dust, triggering dust emission (that is, erosion) followed by mass loss, mass redistribution and surface modifications. Surface changes were revealed by the Deep Impact and Stardust NExT missions for comet 9P/Tempel 1 (ref. 1), and a full inventory of the processes modifyin…
Quasi-periodic Energy Release and Jets at the Base of Solar Coronal Plumes
Kumar, Pankaj; Deforest, Craig E.; Karpen, Judith T. +3 more
Coronal plumes are long, ray-like, open structures that have been considered as possible sources of the solar wind. Their origin in the largely unipolar coronal holes has long been a mystery. Earlier spectroscopic and imaging observations revealed blueshifted plasma and propagating disturbances (PDs) in plumes that are widely interpreted in terms …
SN 2009ip after a decade: the luminous blue variable progenitor is now gone
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Smith, Nathan +3 more
We present new Hubble Space Telescope (HST) imaging photometry for the site of the Type IIn supernova (SN) 2009ip taken almost a decade after explosion. The optical source has continued to fade steadily since the SN-like event in 2012. In the F606W filter, which was also used to detect its luminous blue variable (LBV) progenitor 13 yr before the S…
Radio fossils, relics, and haloes in Abell 3266: cluster archaeology with ASKAP-EMU and the ATCA
Diego, J. M.; Tasse, C.; Eckert, D. +21 more
Abell 3266 is a massive and complex merging galaxy cluster that exhibits significant substructure. We present new, highly sensitive radio continuum observations of Abell 3266 performed with the Australian Square Kilometre Array Pathfinder (0.8-1.1 GHz) and the Australia Telescope Compact Array (1.1-3.1 GHz). These deep observations provide new ins…
New low mass ratio contact binaries in the Catalina Sky Survey
Ferreira Lopes, C. E.; Drake, Andrew J.; Catelan, Márcio +3 more
We present the identification and photometric analysis of 30 new low mass ratio (LMR) totally eclipsing contact binaries found in Catalina Sky Survey data. The LMR candidates are identified using Fourier coefficients and visual inspection. We perform a detailed scan in the parameter plane of mass ratio (q) versus inclination (i) using PHOEBE -0.31…
Detection of δ Scuti Pulsators in the Eclipsing Binaries Observed by TESS
Zhang, Xiaobin; Xiong, Jianping; Ji, Kaifan +6 more
Based on 2 minute cadence TESS data from sectors 1-50, we report the results of the systematic extraction of δ Scuti-type pulsations in the 6431 eclipsing binaries with orbital periods shorter than 13 days. A total number of 242 pulsators were found in those systems, including 143 new discoveries. We examined their pulsation properties based on th…