Search Publications
Planck's dusty GEMS. IV. Star formation and feedback in a maximum starburst at z = 3 seen at 60-pc resolution
Kneissl, R.; Le Floc'h, E.; Scott, D. +7 more
We present an analysis of high-resolution ALMA interferometry of CO(4-3) line emission and dust continuum in the "Ruby" (PLCK_G244.8+54.9), a bright, gravitationally lensed galaxy at z = 3.0 discovered with the Planck all-sky survey. The Ruby is the brightest of Planck's dusty GEMS, a sample of 11 of the brightest gravitationally lensed high-redsh…
RefleX: X-ray absorption and reflection in active galactic nuclei for arbitrary geometries
Paltani, S.; Ricci, C.
Reprocessed X-ray radiation carries important information about the structure and physical characteristics of the material surrounding the supermassive black hole (SMBH) in active galactic nuclei (AGN). We report here on a newly developed simulation platform, RefleX, which allows to reproduce absorption and reflection by quasi-arbitrary geometries…
Combined analysis of galaxy cluster number count, thermal Sunyaev-Zel'dovich power spectrum, and bispectrum
Hurier, G.; Lacasa, F.
The thermal Sunyaev-Zel'dovich (tSZ) effect is a powerful probe of the evolution of structures in the universe, and is thus highly sensitive to cosmological parameters σ8 and Ωm, though its power is hampered by the current uncertainties on the cluster mass calibration. In this analysis we revisit constraints on these cosmolog…
Mapping the hot gas temperature in galaxy clusters using X-ray and Sunyaev-Zel'dovich imaging
Adam, R.; Arnaud, M.; Benoît, A. +42 more
We propose a method to map the temperature distribution of the hot gas in galaxy clusters that uses resolved images of the thermal Sunyaev-Zel'dovich (tSZ) effect in combination with X-ray data. Application to images from the New IRAM KIDs Array (NIKA) and XMM-Newton allows us to measure and determine the spatial distribution of the gas temperatur…
Modelling and simulation of large-scale polarized dust emission over the southern Galactic cap using the GASS HI data
Boulanger, F.; Aumont, J.; Bock, J. J. +8 more
The Planck survey has quantified polarized Galactic foregrounds and established that they are a main limiting factor in the quest for the cosmic microwave background B-mode signal induced by primordial gravitational waves during cosmic inflation. Accurate separation of the Galactic foregrounds therefore binds this quest to our understanding of the…
The power of teaming up HST and Gaia: the first proper motion measurement of the distant cluster NGC 2419
Massari, D.; Helmi, A.; Fiorentino, G. +2 more
Aims: We present the first measurement of the proper motion and orbit of the very distant and intriguing globular cluster NCG 2419.
Methods: We have combined data from HST and Gaia DR1 to derive the relative proper motions of stars in the direction of the cluster. To tie these to an absolute reference frame, we have used a background gal…
Molecular gas, dust, and star formation in galaxies. I. Dust properties and scalings in 1600 nearby galaxies
Magnelli, B.; Daddi, E.; Elbaz, D. +8 more
Context. Dust and its emission is increasingly being used to constrain the evolutionary stage of a galaxy. A comprehensive characterization of dust, best achieved in nearby bright galaxies, is thus a highly useful resource.
Aims: We aim to characterize the relationship between dust properties (mass, luminosity, and temperature) and their rela…
Analysis of a custom support vector machine for photometric redshift estimation and the inclusion of galaxy shape information
Singal, J.; Jones, E.
Aims: We present a custom support vector machine classification package for photometric redshift estimation, including comparisons with other methods. We also explore the efficacy of including galaxy shape information in redshift estimation. Support vector machines, a type of machine learning, utilize optimization theory and supervised learni…
Analysis and modelling of recurrent solar flares observed with Hinode/EIS on March 9, 2012
Mason, H. E.; Del Zanna, G.; Pariat, E. +4 more
Three homologous C-class flares and one last M-class flare were observed by both the Solar Dynamics Observatory (SDO) and the Hinode EUV Imaging Spectrometer (EIS) in the AR 11429 on March 9, 2012. All the recurrent flares occurred within a short interval of time (less than 4 h), showed very similar plasma morphology and were all confined, until t…
HP2 survey. III. The California Molecular Cloud: A sleeping giant revisited
Alves, João; Lada, Charles J.; Lombardi, Marco +1 more
We present new high resolution and dynamic range dust column density and temperature maps of the California Molecular Cloud derived from a combination of Planck and Herschel dust-emission maps, and 2MASS NIR dust-extinction maps. We used these data to determine the ratio of the 2.2 µm extinction coefficient to the 850 µm opacity and fo…