Search Publications
Galaxy And Mass Assembly (GAMA): a forensic SED reconstruction of the cosmic star formation history and metallicity evolution by galaxy type
Hopkins, Andrew M.; Driver, Simon P.; Robotham, Aaron S. G. +9 more
We apply the spectral energy distribution (SED) fitting code PROSPECT to multiwavelength imaging for ∼7000 galaxies from the GAMA survey at z < 0.06, in order to extract their star formation histories. We combine a parametric description of the star formation history with a closed-box evolution of metallicity where the present-day gas-phase met…
The accretion rates and mechanisms of Herbig Ae/Be stars
Mendigutía, I.; Vioque, M.; Oudmaijer, R. D. +3 more
This work presents a spectroscopic study of 163 Herbig Ae/Be stars. Amongst these, we present new data for 30 objects. Stellar parameters such as temperature, reddening, mass, luminosity, and age are homogeneously determined. Mass accretion rates are determined from Hα emission line measurements. Our data is complemented with the X-Shooter sample …
Optically thin spatially resolved Mg II emission maps the escape of ionizing photons
Chisholm, J.; Schaerer, D.; Henry, A. +2 more
Early star-forming galaxies produced copious ionizing photons. A fraction of these photons escaped gas within galaxies to reionize the entire Universe. This escape fraction is crucial for determining how the Universe became reionized, but the neutral intergalactic medium precludes direct measurement of the escape fraction at high redshifts. Indire…
Multiple populations in globular clusters and their parent galaxies
Da Costa, G. S.; Milone, A. P.; Cordoni, G. +14 more
The 'chromosome map' diagram (ChM) proved a successful tool to identify and characterize multiple populations (MPs) in 59 Galactic globular clusters (GCs). Here, we construct ChMs for 11 GCs of both Magellanic Clouds (MCs) and with different ages to compare MPs in Galactic and extragalactic environments, and explore whether this phenomenon is univ…
The KBC void and Hubble tension contradict ΛCDM on a Gpc scale - Milgromian dynamics as a possible solution
Kroupa, Pavel; Haslbauer, Moritz; Banik, Indranil
The KBC void is a local underdensity with the observed relative density contrast δ ≡ 1 - ρ/ρ0 = 0.46 ± 0.06 between 40 and 300 Mpc around the Local Group. If mass is conserved in the Universe, such a void could explain the 5.3σ Hubble tension. However, the MXXL simulation shows that the KBC void causes 6.04σ tension with standard cosmol…
The Pristine survey - X. A large population of low-metallicity stars permeates the Galactic disc
Sestito, Federico; Navarro, Julio F.; Malhan, Khyati +26 more
The orbits of the least chemically enriched stars open a window on the formation of our Galaxy when it was still in its infancy. The common picture is that these low-metallicity stars are distributed as an isotropic, pressure-supported component since these stars were either accreted from the early building blocks of the assembling Milky Way (MW),…
Occurrence rates of planets orbiting M Stars: applying ABC to Kepler DR25, Gaia DR2, and 2MASS data
Terrien, Ryan; Ford, Eric B.; Hsu, Danley C.
We present robust planet occurrence rates for Kepler planet candidates around M stars for planet radii Rp = 0.5-4 R⊕ and orbital periods P = 0.5-256 d using the approximate Bayesian computation technique. This work incorporates the final Kepler DR25 planet candidate catalogue and data products and augments them with updated s…
ALMA and ROSINA detections of phosphorus-bearing molecules: the interstellar thread between star-forming regions and comets
Altwegg, K.; Balsiger, H.; Berthelier, J. J. +20 more
To understand how phosphorus (P)-bearing molecules are formed in star-forming regions, we have analysed the Atacama Large Millimeter/Submillimeter Array (ALMA) observations of PN and PO towards the massive star-forming region AFGL 5142, combined with a new analysis of the data of the comet 67P/Churyumov-Gerasimenko taken with the Rosetta Orbiter S…
Diverse properties of Ly α emission in low-redshift compact star-forming galaxies with extremely high [O III]/[O II] ratios
Schaerer, D.; Thuan, T. X.; Izotov, Y. I. +5 more
We present observations with the Cosmic Origins Spectrograph onboard the Hubble Space Telescope of eight compact star-forming galaxies at redshifts z = 0.02811-0.06540, with low oxygen abundances 12 + log(O/H) = 7.43-7.82 and extremely high emission-line flux ratios O32 = [O III] λ5007/[O II] λ3727 ∼ 22-39, aiming to study the propertie…
The ASAS-SN catalogue of variable stars - V. Variables in the Southern hemisphere
Kochanek, C. S.; Stanek, K. Z.; Shappee, B. J. +13 more
The All-Sky Automated Survey for Supernovae (ASAS-SN) provides long baseline (∼4 yr) light curves for sources brighter than V ≲ 17 mag across the whole sky. As part of our effort to characterize the variability of all the stellar sources visible in ASAS-SN, we have produced ∼30.1 million V-band light curves for sources in the Southern hemisphere u…