Search Publications
An ALMA survey of the SCUBA-2 cosmology legacy survey UKIDSS/UDS field: Dust attenuation in high-redshift Lyman-break galaxies
Thomson, A. P.; Ivison, R. J.; Scott, D. +27 more
We analyse 870 µm Atacama Large Millimetre Array (ALMA) dust continuum detections of 41 canonically selected z ≃ 3 Lyman-break galaxies (LBGs), as well as 209 ALMA-undetected LBGs, in follow-up of SCUBA-2 mapping of the UKIDSS Ultra Deep Survey (UDS) field. We find that our ALMA-bright LBGs lie significantly off the local IRX-beta relation a…
Structural analysis of massive galaxies using HST deep imaging at z < 0.5
Lorenzoni, Silvio; Buitrago, Fernando; Matute, Israel +11 more
Context. The most massive galaxies (Mstellar ≥ 1011 M⊙) in the local Universe are characterized by a bulge-dominated morphology and old stellar populations, in addition to being confined to a tight mass-size relation. Identifying their main components can provide insights into their formation mechanisms and subsequ…
Connecting the Local Stellar Halo and Its Dark Matter Density to Dwarf Galaxies via Blue Stragglers
Casagrande, Luca
The Gaia H-R diagram shows the presence of apparently young stars at high tangential velocities. Using a simple analytical model, I show that these stars are likely to be blue stragglers. Once normalized to red giant stars, the fraction of nearby halo blue stragglers is of order 20%, and remarkably close to that measured in dwarf galaxies. Motivat…
Sunspot penumbral filaments intruding into a light bridge and the resultant reconnection jets
Zhang, J.; Hou, Y. J.; Li, T. +5 more
Context. Penumbral filaments and light bridges are prominent structures inside sunspots and are important for understanding the nature of sunspot magnetic fields and magneto-convection underneath.
Aims: We investigate an interesting event where several penumbral filaments intrude into a sunspot light bridge. In doing so we aim to gain further…
Eta carinae and the homunculus: far infrared/submillimetre spectral lines detected with the Herschel Space Observatory
Gull, T. R.; Nielsen, K. E.; Morris, P. W. +4 more
The evolved massive binary star η Carinae underwent eruptive mass-loss events that formed the complex bi-polar 'Homunculus' nebula harbouring tens of solar masses of unusually nitrogen-rich gas and dust. Despite expectations for the presence of a significant molecular component to the gas, detections have been observationally challenged by limited…
A blinding solution for inference from astronomical data
Sellentin, Elena
This paper presents a joint blinding and deblinding strategy for inference of physical laws from astronomical data. The strategy allows for up to three blinding stages, where the data may be blinded, the computations of theoretical physics may be blinded, and -assuming Gaussianly distributed data - the covariance matrix may be blinded. We found co…
Absolute Properties of the Eclipsing γ Dor Star V404 Lyrae
Koo, Jae-Rim; Hong, Kyeongsoo; Lee, Jae Woo +1 more
We present the first high-resolution spectra for the eclipsing binary V404 Lyr showing γ Dor pulsations, which we use to study its absolute properties. By fitting models to the disentangling spectrum of the primary star, we found that it has an effective temperature of T eff,1 = 7330 ± 150 K and a rotational velocity of v 1 s…
Paβ, Hα, and Attenuation in NGC 5194 and NGC 6946
Murphy, Eric; Schinnerer, Eva; Wong, Tony +5 more
We combine Hubble Space Telescope Paschen β (Paβ) imaging with ground-based, previously published Hα maps to estimate the attenuation affecting Hα, A(Hα), across the nearby, face-on galaxies NGC 5194 and NGC 6946. We estimate A(Hα) in ∼2000 independent 2″ ∼ 75 pc diameter apertures in each galaxy, spanning out to a galactocentric radius of almost …
Empirical completeness assessment of the Gaia DR2, Pan-STARRS 1, and ASAS-SN-II RR Lyrae catalogues
Mateu, Cecilia; Holl, Berry; Rimoldini, Lorenzo +1 more
RR Lyrae stars are an important and widely used tracer of the most ancient populations of our Galaxy, mainly due to their standard candle nature. The current availability of large-scale surveys of variable stars is allowing us to trace the structure of our entire Galaxy, even in previously inaccessible areas like the Galactic disc. In this work, w…
Hydrogenated fullerenes (fulleranes) in space
Zhang, Yong; Hsia, Chih-Hao; Sadjadi, Seyedabdolreza
Since the first laboratory synthesis of C60 in 1985, fullerene-related species have been proposed to interpret various astronomical features. After more than 25 years' efforts, several circumstellar and interstellar features have been convincingly assigned to C60, C70, and C