Search Publications
Candidate high-redshift protoclusters and lensed galaxies in the Planck list of high-z sources overlapping with Herschel-SPIRE imaging
Hill, Ryley; Scott, Douglas; Dole, Hervé +3 more
The Planck list of high-redshift source candidates (the PHz catalogue) contains 2151 peaks in the cosmic infrared background, unresolved by Planck's 5 arcmin beam. Follow-up spectroscopic observations have revealed that some of these objects are $z\, {\approx }\, 2$ protoclusters and strong gravitational lenses but an unbiased survey has not yet b…
X-ray timing and spectral analysis of reverberating active galactic nuclei
Chainakun, P.; Young, A. J.; Hancock, S.
We use the publicly available XMM-Newton archive to select a sample of 20 active galactic nuclei (AGNs) known to exhibit reverberation signatures caused by the reflection of X-rays from the corona off the accretion disc that feeds the central black hole engine. Inverse Compton scattering by energetic electrons, coupled with accretion disc fluctuat…
Enhancement of double-close-binary quadruples
Zakamska, Nadia L.; Hwang, Hsiang-Chih; Fezenko, Gavin B.
Double-close-binary quadruples (2 + 2 systems) are hierarchical systems of four stars where two short-period binary systems move around their common centre of mass on a wider orbit. Using Gaia Early Data Release 3, we search for comoving pairs where both components are eclipsing binaries. We present eight 2 + 2 quadruple systems with inner orbital…
Probabilistic model for dynamic galaxy decomposition
Mandelbaum, Rachel; Rau, Markus Michael; Jagvaral, Yesukhei +1 more
In the era of precision cosmology and ever-improving cosmological simulations, a better understanding of different galaxy components such as bulges and discs will give us new insight into galactic formation and evolution. Based on the fact that the stellar populations of the constituent components of galaxies differ by their dynamical properties, …
CO2-driven surface changes in the Hapi region on Comet 67P/Churyumov-Gerasimenko
Da Deppo, Vania; Lellouch, Emmanuel; Buratti, Bonnie J. +24 more
Between 2014 December 31 and 2015 March 17, the OSIRIS cameras on Rosetta documented the growth of a $140\, \mathrm{\hbox{-}m}$ wide and $0.5\, \mathrm{\hbox{-}m}$ deep depression in the Hapi region on Comet 67P/Churyumov-Gerasimenko. This shallow pit is one of several that later formed elsewhere on the comet, all in smooth terrain that primarily …
Water observed in the atmosphere of τ Boötis Ab with CARMENES/CAHA
Zhang, Yapeng; Gandhi, Siddharth; Brogi, Matteo +4 more
Characterizing the atmospheres of hot Jupiters is important in understanding the formation and migration of these exotic planets. However, there are still many open questions about the chemical and physical properties of these atmospheres. Here, we confirm the detection of water vapour in thermal emission from the non-transiting hot Jupiter τ Boöt…
Searching for the connection between ionizing-photon escape and the surface density of star formation at z 3
Steidel, Charles C.; Reddy, Naveen A.; Shapley, Alice +2 more
The connection between the escape fraction of ionizing photons (fesc) and star formation rate surface density (ΣSFR) is a key input for reionization models, but remains untested at high redshift. We analyse 35 z ~ 3 galaxies from the Keck Lyman Continuum Survey (KLCS) covered by deep, rest far-UV spectra of the Lyman continuu…
Cloud-scale radio surveys of star formation and feedback in Triangulum Galaxy M 33: VLA observations
Menten, K. M.; Braine, J.; Beck, R. +11 more
Studying the interplay between massive star formation and the interstellar medium (ISM) is paramount to understand the evolution of galaxies. Radio continuum (RC) emission serves as an extinction-free tracer of both massive star formation and the energetic components of the ISM. We present a multiband RC survey of the Local Group galaxy M 33 down …
The high-velocity clouds above the disc of the outer Milky Way: misty precipitating gas in a region roiled by stellar streams
Tripp, Todd M.
The high-velocity clouds (HVCs) in the outer Milky Way at 20° < l < 190° have similar spatial locations, metallicities, and kinematics. Moreover, their locations and kinematics are coincident with several extraplanar stellar streams. The HVC origins may be connected to the stellar streams, either stripped directly from them or precipitated b…
Probing infrared excess connection with Li enhancement among red clump giants
Reddy, Bacham E.; Muthumariappan, C.; Mallick, Anohita
We have performed a search among low-mass red giants for finding evidence for merger scenario for triggering He-flash and subsequent Li enhancement. We chose a sample of red giants from GALAH survey with well-measured Li abundances, and near- and mid-IR fluxes from 2MASS and WISE surveys, respectively. The sample contains 418 cool red clump giants…