Search Publications
S2COSMOS: Evolution of gas mass with redshift using dust emission
Małek, K.; Ao, Y.; Ho, L. C. +15 more
We investigate the evolution of the gas mass fraction for galaxies in the COSMOS field using submillimetre emission from dust at 850 µm. We use stacking methodologies on the 850 µm S2COSMOS map to derive the gas mass fraction of galaxies out to high redshifts, 0 ≤ z ≤ 5, for galaxies with stellar masses of 109.5 < M*…
Spectral characterization of the non-thermal X-ray emission of gamma-ray pulsars
Coti Zelati, Francesco; Torres, Diego F.; Li, Jian +1 more
We report on a detailed spectral characterization of the non-thermal X-ray emission for a large sample of gamma-ray pulsars in the second Fermi Large Area Telescope catalogue. We outline the criteria adopted for the selection of our sample, its completeness, and critically describe different approaches to estimate the spectral shape and flux of pu…
The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters - XXI. Binaries among multiple stellar populations
Salaris, M.; Anderson, J.; Milone, A. P. +17 more
A number of scenarios for the formation of multiple populations in globular clusters (GCs) predict that second generation (2G) stars form in a compact and dense subsystem embedded in a more extended first-generation (1G) system. If these scenarios are accurate, a consequence of the denser 2G formation environment is that 2G binaries should be more…
A versatile tool for cluster lensing source reconstruction - I. Methodology and illustration on sources in the Hubble Frontier Field Cluster MACS J0717.5+3745
Treu, Tommaso; Birrer, Simon; Yang, Lilan
We describe a general-purpose method to reconstruct the intrinsic properties of sources lensed by the gravitational potential of foreground clusters of galaxies. The tool LENSTRUCTION is implemented in the publicly available multipurpose gravitational lensing software LENSTRONOMY, in order to provide an easy and fast solution to this common astrop…
An expanded catalogue of low surface brightness galaxies in the Coma cluster using Subaru/Suprime-Cam
Forbes, Duncan A.; Romanowsky, Aaron J.; Alabi, Adebusola B. +2 more
We present a catalogue of low surface brightness (LSB) galaxies in the Coma cluster obtained from deep Subaru/Suprime-Cam V- and R-band imaging data within a region of $\mathord {\sim }4$ deg2. We increase the number of LSB galaxies presented in Yagi et al. (2016) by a factor of $\mathord {\sim }3$ and report the discovery of 29 new ult…
Surveying the Giant H II Regions of the Milky Way with SOFIA. II. M17
Lim, Wanggi; De Buizer, James M.; Radomski, James T.
We present our second set of results from our mid-infrared imaging survey of Milky Way giant H II regions. We used the FORCAST instrument on the Stratospheric Observatory For Infrared Astronomy (SOFIA) to obtain 20 and 37 µm images of the central ∼10' × 10' area of M17. We investigate the small- and large-scale properties of M17 using our da…
The abundance of S- and Si-bearing molecules in O-rich circumstellar envelopes of AGB stars
Cernicharo, J.; Agúndez, M.; Velilla-Prieto, L. +1 more
Aims: We aim to determine the abundances of SiO, CS, SiS, SO, and SO2 in a large sample of oxygen-rich asymptotic giant branch (AGB) envelopes covering a wide range of mass loss rates to investigate the potential role that these molecules could play in the formation of dust in these environments.
Methods: We surveyed a sample …
Endogenic and Exogenic Contributions to Visible-wavelength Spectra of Europa's Trailing Hemisphere
Brown, Michael E.; Hand, Kevin P.; Trumbo, Samantha K.
The composition of Europa's trailing hemisphere reflects the combined influences of endogenous geologic resurfacing and exogenous sulfur radiolysis. Using spatially resolved visible-wavelength spectra of Europa obtained with the Hubble Space Telescope, we map multiple spectral features across the trailing hemisphere and compare their geographies w…
A spectroscopic test of the rotational modulation origin of periodic Kepler photometric variability of A-type stars
Wade, G. A.; Sikora, J.; Rowe, J.
High-precision space-based photometry obtained by the Kepler and TESS missions has revealed evidence of rotational modulation associated with main-sequence (MS) A- and late B-type stars. Generally, such variability in these objects is attributed to inhomogeneous surface structures (e.g. chemical spots), which are typically linked to strong magneti…
Activity and differential rotation of the early M dwarf Kepler-45 from transit mapping
Marsden, S. C.; Carter, B. D.; Valio, A. +1 more
Little is known of the activity and differential rotation of low luminosity, early M dwarfs from direct observation. We present the first stellar activity analysis of star-spots and faculae for the hot Jupiter hosting M1V dwarf Kepler-45 from Kepler transit light curves. We find star-spot and facula temperatures contrasting a few hundred degrees w…