Search Publications
Bright, relatively isolated star clusters in PHANGS-HST galaxies: Aperture corrections, quantitative morphologies, and comparison with synthetic stellar population models
Kruijssen, J. M. Diederik; Rosolowsky, Erik; Glover, Simon C. O. +14 more
Using PHANGS-HST NUV-U-B-V-I imaging of 17 nearby spiral galaxies, we study samples of star clusters and stellar associations, visually selected to be bright and relatively isolated, for three purposes: to compute aperture corrections for star cluster photometry, to explore the utility of quantitative morphologies in the analysis of clusters and a…
The evolution of ultra-massive carbon-oxygen white dwarfs
Córsico, Alejandro H.; Althaus, Leandro G.; Torres, Santiago +3 more
Ultra-massive white dwarfs ($\rm \mathit{M}_{WD} \gtrsim 1.05\, {\rm M}_{\odot }$) are considered powerful tools to study Type Ia supernovae explosions, merger events, the occurrence of physical processes in the superasymptotic giant branch phase, and the existence of high magnetic fields. Traditionally, ultra-massive white dwarfs are expected to …
The UV 2175Å attenuation bump and its correlation with PAH emission at z 2
Brinchmann, Jarle; Nanayakkara, Themiya; Shivaei, Irene +10 more
The UV bump is a broad absorption feature centred at 2175 Å that is seen in the attenuation/extinction curve of some galaxies, but its origin is not well known. Here, we use a sample of 86 star-forming galaxies at z = 1.7-2.7 with deep rest-frame UV spectroscopy from the MUSE HUDF Survey to study the connection between the strength of the observed…
The local hole: a galaxy underdensity covering 90 per cent of sky to ≈200 Mpc
Metcalfe, N.; Shanks, T.; Whitbourn, J. R. +1 more
We investigate the 'Local Hole', an anomalous underdensity in the local galaxy environment, by extending our previous galaxy K-band number-redshift and number-magnitude counts to ≈90 per cent of the sky. Our redshift samples are taken from the 2MASS Redshift Survey (2MRS) and the 2M++ catalogues, limited to K < 11.5. We find that both surveys a…
Solar-to-supersolar sodium and oxygen absolute abundances for a 'hot Saturn' orbiting a metal-rich star
Deming, Drake; Fortney, Jonathan J.; Smalley, Barry +10 more
We present new analysis of infrared transmission spectroscopy of the cloud-free hot-Saturn WASP-96b performed with the Hubble and Spitzer Space Telescopes (HST and Spitzer). The WASP-96b spectrum exhibits the absorption feature from water in excellent agreement with synthetic spectra computed assuming a cloud-free atmosphere. The HST-Spitzer spect…
Red supergiant stars in binary systems. I. Identification and characterization in the small magellanic cloud from the UVIT ultraviolet imaging survey
Lennon, D. J.; Bianchi, L.; Negueruela, I. +5 more
We aim to identify and characterize binary systems containing red supergiant (RSG) stars in the Small Magellanic Cloud (SMC) using a newly available ultraviolet (UV) point source catalogue obtained using the Ultraviolet Imaging Telescope (UVIT) on board AstroSat. We select a sample of 560 SMC RSGs based on photometric and spectroscopic observation…
The 'Giraffe': discovery of a stripped red giant in an interacting binary with an 2 M⊙ lower giant
Ilyin, I.; Kochanek, C. S.; Badenes, C. +13 more
We report the discovery of a stripped giant + lower giant Algol-type binary, 2M04123153+6738486 (2M0412), identified during a search for non-interacting compact object - star binaries. 2M0412 is an evolved (Teff, giant ≃ 4000 K), luminous (Lgiant ≃ 150 L⊙) red giant in a circular P = 81.2 d binary. 2M0412 is a know…
Progenitor, environment, and modelling of the interacting transient AT 2016jbu (Gaia16cfr)
Sollerman, J.; Reichart, D. E.; Harrison, D. L. +67 more
We present the bolometric light curve, identification and analysis of the progenitor candidate, and preliminary modelling of AT 2016jbu (Gaia16cfr). We find a progenitor consistent with a ~ 22-25 M⊙ yellow hypergiant surrounded by a dusty circumstellar shell, in agreement with what has been previously reported. We see evidence for signi…
A novel black hole mass scaling relation based on coronal gas, and its dependence with the accretion disc
Panda, Swayamtrupta; Rodríguez-Ardila, Alberto; Marinello, Murilo +1 more
Using bona-fide black hole (BH) mass estimates from reverberation mapping and the line ratio [Si VI] 1.963$\rm{\mu m}$/Brγbroad as tracer of the AGN ionizing continuum, a novel BH-mass scaling relation of the form log(MBH) = (6.40 ± 0.17) - (1.99 ± 0.37) × log ([Si VI]/Brγbroad), dispersion 0.47 dex, over the BH ma…
AGN impact on the molecular gas in galactic centres as probed by CO lines
Vallini, Livia; Mingozzi, Matilde; Vignali, Cristian +5 more
We present a detailed analysis of the X-ray, infrared, and carbon monoxide (CO) emission for a sample of 35 local (z ≤ 0.15), active (LX ≥ 1042 erg s-1) galaxies. Our goal is to infer the contribution of far-ultraviolet (FUV) radiation from star formation (SF), and X-ray radiation from the active galactic nuclei (A…