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Absolute V-band magnitudes and mass-to-light ratios of Galactic globular clusters
Hilker, M.; Baumgardt, H.; Sollima, A.
We have used Hubble Space Telescope and ground-based photometry to determine total V-band magnitudes and mass-to-light ratios of more than 150 Galactic globular clusters. We do this by summing up the magnitudes of their individual member stars, using colour-magnitude information, Gaia DR2 proper motions, and radial velocities to distinguish cluste…
Galaxy spin direction distribution in HST and SDSS show similar large-scale asymmetry
Shamir, Lior
Several recent observations using large data sets of galaxies showed non-random distribution of the spin directions of spiral galaxies, even when the galaxies are too far from each other to have gravitational interaction. Here, a data set of$\sim8.7\cdot10^3$spiral galaxies imaged byHubble Space Telescope(HST) is used to test and profile a possibl…
ASKAP reveals giant radio halos in two merging SPT galaxy clusters
Johnston-Hollitt, Melanie; Akamatsu, Hiroki; Hodgson, Torrance +4 more
Early science observations from the Australian Square Kilometre Array Pathfinder (ASKAP) have revealed clear signals of diffuse radio emission associated with two clusters detected by the South Pole Telescope via their Sunyaev Zel'dovich signal: SPT CLJ0553-3342 (MACS J0553.4-3342) and SPT CLJ0638-5358 (Abell S0592) are both high-mass lensing clus…