Search Publications
Star formation characteristics of CNN-identified post-mergers in the Ultraviolet Near Infrared Optical Northern Survey (UNIONS)
Ellison, Sara L.; Gwyn, Stephen; Hudson, Michael J. +3 more
The importance of the post-merger epoch in galaxy evolution has been well documented, but post-mergers are notoriously difficult to identify. While the features induced by mergers can sometimes be distinctive, they are frequently missed by visual inspection. In addition, visual classification efforts are highly inefficient because of the inherent …
Statistics of galaxy mergers: bridging the gap between theory and observation
Baugh, Carlton M.; Lacey, Cedric G.; Huško, Filip
We present a study of galaxy mergers up to z = 10 using the Planck Millennium cosmological dark matter simulation and the GALFORM semi-analytical model of galaxy formation. Utilizing the full 800 Mpc3 volume of the simulation, we studied the statistics of galaxy mergers in terms of merger rates and close pair fractions. We predict that …
Planetary nebula luminosity function distances for 19 galaxies observed by PHANGS-MUSE
Van Dyk, Schuyler D.; Kruijssen, J. M. Diederik; Rosolowsky, Erik +15 more
We provide new planetary nebula luminosity function (PNLF) distances to 19 nearby spiral galaxies that were observed with VLT/MUSE by the PHANGS collaboration. Emission line ratios are used to separate planetary nebulae (PNe) from other bright $[\mathrm{O}\, {\small III}]$ emitting sources like compact supernovae remnants (SNRs) or H II regions. W…
The bright extragalactic ALMA redshift survey (BEARS) I: redshifts of bright gravitationally lensed galaxies from the Herschel ATLAS
Berta, S.; Andreani, P.; Omont, A. +53 more
We present spectroscopic measurements for 71 galaxies associated with 62 of the brightest high-redshift submillimetre sources from the Southern fields of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS), while targeting 85 sources which resolved into 142. We have obtained robust redshift measurements for all sources using the 12-m …
No evidence for a strong decrease of planetesimal accretion in old white dwarfs
Blouin, Simon; Xu, Siyi
A large fraction of white dwarfs are accreting or have recently accreted rocky material from their planetary systems, thereby 'polluting' their atmospheres with elements heavier than helium. In recent years, the quest for mechanisms that can deliver planetesimals to the immediate vicinity of their central white dwarfs has stimulated a flurry of mo…
Measuring sloshing, merging, and feedback velocities in the Virgo cluster
Fabian, A. C.; Pinto, C.; Sanders, J. S. +5 more
We present a detailed analysis of the velocity structure of the Virgo cluster using XMM-Newton observations. Using a novel technique which uses the Cu K α instrumental line to calibrate the EPIC-pn energy scale, we are able to obtain velocity measurements with uncertainties down to Δv ~ 100 km s-1. We created 2D projected maps for the v…
Identifying resonances of the Galactic bar in Gaia DR2: II. Clues from angle space
Trick, Wilma H.
The Milky Way disc exhibits intricate orbit substructure of still debated dynamical origin. The angle variables (θϕ, θR) - which are conjugates to the actions (L$z$, JR), and describe a star's location along its orbit - are a powerful diagnostic to identify l:m resonances via the orbit shape relation Δθ<…
A high-resolution view of the filament of gas between Abell 399 and Abell 401 from the Atacama Cosmology Telescope and MUSTANG-2
Sarazin, Craig L.; Hilton, Matt; Sifón, Cristóbal +43 more
We report a significant detection of the hot intergalactic medium in the filamentary bridge connecting the galaxy clusters Abell 399 and Abell 401. This result is enabled by a low-noise, high-resolution map of the thermal Sunyaev-Zeldovich signal from the Atacama Cosmology Telescope (ACT) and Planck satellite. The ACT data provide the 1.65 arcmin …
Orbital architectures of planet-hosting binaries - II. Low mutual inclinations between planetary and stellar orbits
Huber, Daniel; Kratter, Kaitlin M.; Rizzuto, Aaron C. +4 more
Planet formation is often considered in the context of one circumstellar disc around one star. Yet, stellar binary systems are ubiquitous, and thus a substantial fraction of all potential planets must form and evolve in more complex, dynamical environments. We present the results of a 5 yr astrometric monitoring campaign studying 45 binary star sy…
Photometric and spectroscopic evolution of the interacting transient AT 2016jbu(Gaia16cfr)
Sollerman, J.; Reichart, D. E.; Harrison, D. L. +68 more
We present the results from a high-cadence, multiwavelength observation campaign of AT 2016jbu (aka Gaia16cfr), an interacting transient. This data set complements the current literature by adding higher cadence as well as extended coverage of the light-curve evolution and late-time spectroscopic evolution. Photometric coverage reveals that AT 201…