Search Publications
Ionized and Molecular Gas Kinematics in a z = 1.4 Star-forming Galaxy
Lutz, D.; Wuyts, S.; Förster Schreiber, N. M. +17 more
We present deep observations of a z = 1.4 massive, star-forming galaxy (SFG) in molecular and ionized gas at comparable spatial resolution (CO 3-2, NOrthern Extended Millimeter Array (NOEMA); Hα, Large Binocular Telescope (LBT)). The kinematic tracers agree well, indicating that both gas phases are subject to the same gravitational potential and p…
Observational constraints on Gauss-Bonnet cosmology
Benetti, Micol; Alcaniz, Jailson S.; Capozziello, Salvatore +2 more
We analyze a fully geometric approach to dark energy in the framework of F(R,𝒢) theories of gravity, where R is the Ricci curvature scalar and 𝒢 is the Gauss-Bonnet topological invariant. The latter invariant naturally exhausts, together with R, the whole curvature content related to curvature invariants coming from the Riemann tensor. In particul…
On the insufficiency of arbitrarily precise covariance matrices: non-Gaussian weak-lensing likelihoods
Sellentin, Elena; Heavens, Alan F.
We investigate whether a Gaussian likelihood, as routinely assumed in the analysis of cosmological data, is supported by simulated survey data. We define test statistics, based on a novel method that first destroys Gaussian correlations in a data set, and then measures the non-Gaussian correlations that remain. This procedure flags pairs of data p…
The young star cluster population of M51 with LEGUS - I. A comprehensive study of cluster formation and evolution
Weber, M.; Östlin, G.; Tosi, M. +34 more
Recently acquired WFC3 UV (F275W and F336W) imaging mosaics under the Legacy Extragalactic UV Survey (LEGUS), combined with archival ACS data of M51, are used to study the young star cluster (YSC) population of this interacting system. Our newly extracted source catalogue contains 2834 cluster candidates, morphologically classified to be compact a…
The Projected Dark and Baryonic Ellipsoidal Structure of 20 CLASH Galaxy Clusters
Donahue, Megan; Broadhurst, Tom; Zitrin, Adi +24 more
We reconstruct the two-dimensional (2D) matter distributions in 20 high-mass galaxy clusters selected from the CLASH survey by using the new approach of performing a joint weak gravitational lensing analysis of 2D shear and azimuthally averaged magnification measurements. This combination allows for a complete analysis of the field, effectively br…
Magnetic Reconnection at the Earliest Stage of Solar Flux Emergence
Chen, Yajie; Tian, Hui; Zhu, Xiaoshuai +3 more
On 2016 September 20, the Interface Region Imaging Spectrograph observed an active region during its earliest emerging phase for almost 7 hr. The Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory observed continuous emergence of small-scale magnetic bipoles with a rate of ∼1016 Mx s-1. The emergence of …
New stellar encounters discovered in the second Gaia data release
Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M. +1 more
Passing stars may play an important role in the evolution of our solar system. We search for close stellar encounters to the Sun among all 7.2 million stars in Gaia DR2 that have six-dimensional phase space data. We characterize encounters by integrating their orbits through a Galactic potential and propagating the correlated uncertainties via a M…
Connecting the progenitors, pre-explosion variability and giant outbursts of luminous blue variables with Gaia16cfr
Filippenko, Alexei V.; Kilpatrick, Charles D.; Coulter, David A. +10 more
We present multi-epoch, multicolour pre-outburst photometry and post-outburst light curves and spectra of the luminous blue variable (LBV) outburst Gaia16cfr discovered by the Gaia satellite on 2016 December 1 UT. We detect Gaia16cfr in 13 epochs of Hubble Space Telescope imaging spanning phases of 10 yr to 8 months before the outburst and in Spit…
WISDOM Project - III. Molecular gas measurement of the supermassive black hole mass in the barred lenticular galaxy NGC4429
van de Voort, Freeke; Sarzi, Marc; Cappellari, Michele +7 more
As part of the mm-Wave Interferometric Survey of Dark Object Masses project we present an estimate of the mass of the supermassive black hole (SMBH) in the nearby fast-rotating early-type galaxy NGC4429, that is barred and has a boxy/peanut-shaped bulge. This estimate is based on Atacama Large Millimeter/submillimeter Array (ALMA) cycle-2 observat…
The TOP-SCOPE Survey of Planck Galactic Cold Clumps: Survey Overview and Results of an Exemplar Source, PGCC G26.53+0.17
Bernard, J. -P.; McGehee, P.; Montier, L. +153 more
The low dust temperatures (<14 K) of Planck Galactic cold clumps (PGCCs) make them ideal targets to probe the initial conditions and very early phase of star formation. “TOP-SCOPE” is a joint survey program targeting ∼2000 PGCCs in J = 1-0 transitions of CO isotopologues and ∼1000 PGCCs in 850 µm continuum emission. The objective of the “…