Search Publications
Cosmological parameter forecasts for H I intensity mapping experiments using the angular power spectrum
Dickinson, C.; Remazeilles, M.; Olivari, L. C. +4 more
H I intensity mapping is a new observational technique to survey the large-scale structure of matter using the 21 cm emission line of atomic hydrogen (H I). In this work, we simulate BINGO (BAO from Integrated Neutral Gas Observations) and SKA (Square Kilometre Array) phase-1 dish array operating in autocorrelation mode. For the optimal case of BI…
Quantifying the AGN-driven outflows in ULIRGs (QUADROS) - II. Evidence for compact outflow regions from HST [O III] imaging observations
Rose, M.; Chiaberge, M.; Batcheldor, D. +7 more
The true importance of the warm, AGN-driven outflows for the evolution of galaxies remains uncertain. Measurements of the radial extents of the outflows are key for quantifying their masses and kinetic powers, and also establishing whether the AGN outflows are galaxy-wide. Therefore, as part of a larger project to investigate the significance of w…
The GALAH survey and Gaia DR2: (non-)existence of five sparse high-latitude open clusters
Lewis, Geraint F.; Ting, Yuan-Sen; Bedding, Timothy R. +21 more
Sparse open clusters can be found at high galactic latitudes where loosely populated clusters are more easily detected against the lower stellar background. Because most star formation takes place in the thin disc, the observed population of clusters far from the Galactic plane is hard to explain. We combined spectral parameters from the GALAH sur…
SN 2016X: a type II-P supernova with a signature of shock breakout from explosion of a massive red supergiant
Brown, P. J.; McCully, C.; Lin, H. +15 more
We present extensive ultraviolet (UV) and optical photometry, as well as dense optical spectroscopy, for type II Plateau (IIP) supernova SN 2016X that exploded in the nearby (∼15 Mpc) spiral galaxy UGC 08041. The observations span the period from 2 to 180 d after the explosion; in particular, the Swift UV data probably captured the signature of sh…
Isotropy analyses of the Planck convergence map
Novaes, C. P.; Bernui, A.; Ferreira, I. S. +1 more
The presence of matter in the path of relic photons causes distortions in the angular pattern of the cosmic microwave background (CMB) temperature fluctuations, modifying their properties in a slight but measurable way. Recently, the Planck Collaboration released the estimated convergence map, an integrated measure of the large-scale matter distri…
Abell 1367: a high fraction of late-type galaxies displaying H I morphological and kinematic perturbations
Boselli, A.; Cortese, L.; Scott, T. C. +2 more
To investigate the effects the cluster environment has on late-type galaxies (LTGs), we studied H I perturbation signatures for all Abell 1367 LTGs with H I detections. We used new Very Large Array H I observations combined with AGES single-dish blind survey data. Our study indicates that the asymmetry between the high- and low-velocity wings of t…
First results from the LIFE project: discovery of two magnetic hot evolved stars
Fossati, L.; Wade, G. A.; Neiner, C. +6 more
We present the initial results of the Large Impact of magnetic Fields on the Evolution of hot stars (LIFE) project. The focus of this project is the search for magnetic fields in evolved OBA giants and supergiants with visual magnitudes between 4 and 8, with the aim to investigate how the magnetic fields observed in upper main-sequence (MS) stars …
O/H-N/O: the curious case of NGC 4670
Kumari, Nimisha; James, Bethan L.; Irwin, Mike J. +2 more
We use integral field spectroscopic (IFS) observations from Gemini Multi-Object Spectrograph North (GMOS-N) of a group of four H II regions and the surrounding gas in the central region of the blue compact dwarf (BCD) galaxy NGC 4670. At spatial scales of ∼9 pc, we map the spatial distribution of a variety of physical properties of the ionized gas…
HD 89345: a bright oscillating star hosting a transiting warm Saturn-sized planet observed by K2
Deeg, H.; Fridlund, M.; García, R. A. +40 more
We report the discovery and characterization of HD 89345b (K2-234b; EPIC 248777106b), a Saturn-sized planet orbiting a slightly evolved star. HD 89345 is a bright star (V = 9.3 mag) observed by the K2 mission with 1 min time sampling. It exhibits solar-like oscillations. We conducted asteroseismology to determine the parameters of the star, findin…
The part and the whole: voids, supervoids, and their ISW imprint
Kovács, András
The integrated Sachs-Wolfe (ISW) imprint of extreme structures in the cosmic web probes the dynamical nature of dark energy. Looking through typical cosmic voids, no anomalous signal has been reported. On the contrary, supervoids, associated with large-scale fluctuations in the gravitational potential, have shown potentially disturbing excess sign…