Search Publications
Methodology to create a new total solar irradiance record: Making a composite out of multiple data records
Schöll, Micha; Dudok de Wit, Thierry; Fröhlich, Claus +1 more
Many observational records critically rely on our ability to merge different (and not necessarily overlapping) observations into a single composite. We provide a novel and fully traceable approach for doing so, which relies on a multiscale maximum likelihood estimator. This approach overcomes the problem of data gaps in a natural way and uses data…
Massive post-starburst galaxies at z > 1 are compact proto-spheroids
Simpson, Chris; Wild, Vivienne; Almaini, Omar +6 more
We investigate the relationship between the quenching of star formation and the structural transformation of massive galaxies, using a large sample of photometrically selected post-starburst galaxies in the UKIDSS Ultra-Deep Survey field. We find that post-starburst galaxies at high redshift (z > 1) show high Sérsic indices, significantly highe…
WISDOM Project - II. Molecular gas measurement of the supermassive black hole mass in NGC 4697
Sarzi, Marc; Cappellari, Michele; Davis, Timothy A. +3 more
As part of the mm-Wave Interferometric Survey of Dark Object Masses (WISDOM) project, we present an estimate of the mass of the supermassive black hole (SMBH) in the nearby fast-rotating early-type galaxy NGC 4697. This estimate is based on Atacama Large Millimeter/submillimeter Array (ALMA) cycle-3 observations of the 12CO(2-1) emissio…
Modeling the Anomalous Microwave Emission with Spinning Nanoparticles: No PAHs Required
Draine, B. T.; Hensley, Brandon S.
In light of recent observational results indicating an apparent lack of correlation between the anomalous microwave emission (AME) and mid-infrared emission from polycyclic aromatic hydrocarbons, we assess whether rotational emission from spinning silicate and/or iron nanoparticles could account for the observed AME without violating observational…
An X-ray/SDSS sample. I. Multi-phase outflow incidence and dependence on AGN luminosity
Brusa, M.; Lanzuisi, G.; Perna, M. +2 more
Aims: The connection between the growth of super-massive black holes (SMBHs) and the evolution of their host galaxies is nowadays well established, although the underlying mechanisms explaining their mutual relations are still debated. Multi-phase fast, massive outflows have been postulated to play a crucial role in this process. The aim of t…
The Y-type Brown Dwarfs: Estimates of Mass and Age from New Astrometry, Homogenized Photometry, and Near-infrared Spectroscopy
Luhman, K. L.; Tremblin, P.; Morley, Caroline V. +2 more
The survey of the mid-infrared sky by the Wide-field Infrared Survey Explorer (WISE) led to the discovery of extremely cold, low-mass brown dwarfs, classified as Y dwarfs, which extend the T class to lower temperatures. Twenty-four Y dwarfs are known at the time of writing. Here we present improved parallaxes for four of these, determined using Sp…
In-depth study of moderately young but extremely red, very dusty substellar companion HD 206893B
Rouan, D.; Absil, O.; Henning, T. +47 more
Context. The substellar companion HD 206893b has recently been discovered by direct imaging of its disc-bearing host star with the Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) instrument.
Aims: We investigate the atypical properties of the companion, which has the reddest near-infrared colours among all known substellar obje…
X-Ray and Radio Observations of the Magnetar SGR J1935+2154 during Its 2014, 2015, and 2016 Outbursts
Göğüş, Ersin; Kouveliotou, Chryssa; Lin, Lin +10 more
We analyzed broadband X-ray and radio data of the magnetar SGR J1935+2154 taken in the aftermath of its 2014, 2015, and 2016 outbursts. The source soft X-ray spectrum <10 keV is well described with a blackbody+power-law (BB+PL) or 2BB model during all three outbursts. Nuclear Spectroscopic Telescope Array observations revealed a hard X-ray tail…
A Multiple Flux-tube Solar Wind Model
Rouillard, Alexis P.; Pinto, Rui F.
We present a new model, MULTI-VP, which computes the three-dimensional structure of the solar wind and includes the chromosphere, the transition region, and the corona and low heliosphere. MULTI-VP calculates a large ensemble of wind profiles flowing along open magnetic field lines that sample the entire three-dimensional atmosphere or, alternativ…
The evolving far-IR galaxy luminosity function and dust-obscured star formation rate density out to z≃5.
Scott, D.; McLure, R. J.; Dunlop, J. S. +5 more
We present a new measurement of the evolving galaxy far-IR luminosity function (LF) extending out to redshifts z ≃ 5, with resulting implications for the level of dust-obscured star formation density in the young Universe. To achieve this, we have exploited recent advances in sub-mm/mm imaging with SCUBA-2 on the James Clerk Maxwell Telescope and …