Search Publications
The far-infrared emitting region in local galaxies and QSOs: Size and scaling relations
Berta, S.; Lutz, D.; Förster Schreiber, N. M. +9 more
We use Herschel 70 to 160 µm images to study the size of the far-infrared emitting region in about 400 local galaxies and quasar (QSO) hosts. The sample includes normal "main-sequence" star-forming galaxies, as well as infrared luminous galaxies and Palomar-Green QSOs, with different levels and structures of star formation. Assuming Gaussian…
The XXL Survey . IV. Mass-temperature relation of the bright cluster sample
Smith, G. P.; Chiappetti, L.; Pierre, M. +18 more
Context. The XXL Survey is the largest survey carried out by XMM-Newton. Covering an area of 50 deg2, the survey contains ~450 galaxy clusters out to a redshift ~2 and to an X-ray flux limit of ~ 5 × 10-15 erg s-1 cm-2. This paper is part of the first release of XXL results focussed on the bright cluster…
Dust properties of Lyman-break galaxies at z ~ 3
Pérez-Fournon, I.; Rodighiero, G.; Ilbert, O. +18 more
Context. Since the mid-1990s, the sample of Lyman-break galaxies (LBGs) has been growing thanks to the increasing sensitivities in the optical and in near-infrared telescopes for objects at z> 2.5. However, the dust properties of the LBGs are poorly known because the samples are small and/or biased against far-infrared (far-IR) or submillimeter…
Systematic comparison of photoionised plasma codes with application to spectroscopic studies of AGN in X-rays
Kaastra, J. S.; Mehdipour, M.; Kallman, T.
Atomic data and plasma models play a crucial role in the diagnosis and interpretation of astrophysical spectra, thus influencing our understanding of the Universe. In this investigation we present a systematic comparison of the leading photoionisation codes to determine how much their intrinsic differences impact X-ray spectroscopic studies of hot…
Stellar parametrization from Gaia RVS spectra
Allende Prieto, C.; Recio-Blanco, A.; de Laverny, P. +7 more
Context. Among the myriad of data collected by the ESA Gaia satellite, about 150 million spectra will be delivered by the Radial Velocity Spectrometer (RVS) for stars as faint as GRVS~ 16. A specific stellar parametrization will be performed on most of these RVS spectra, I.e. those with enough high signal-to-noise ratio (S/N), which sho…
Planck 2015 results. VI. LFI mapmaking
Bernard, J. -P.; Planck Collaboration; Ade, P. A. R. +198 more
This paper describes the mapmaking procedure applied to Planck Low Frequency Instrument (LFI) data. The mapmaking step takes as input the calibrated timelines and pointing information. The main products are sky maps of I, Q, and U Stokes components. For the first time, we present polarization maps at LFI frequencies. The mapmaking algorithm is bas…
Convolution kernels for multi-wavelength imaging
Abergel, A.; Dole, H.; Bocchio, M. +3 more
Astrophysical images issued from different instruments and/or spectral bands often require to be processed together, either for fitting or comparison purposes. However each image is affected by an instrumental response, also known as point-spread function (PSF), that depends on the characteristics of the instrument as well as the wavelength and th…
Observational evidence of a slow downfall of star formation efficiency in massive galaxies during the past 10 Gyr
Daddi, E.; Elbaz, D.; Ciesla, L. +5 more
We study the causes of the reported mass-dependence in the slope of the SFR-M∗ relation, the so-called main sequence of star-forming galaxies, and discuss its implication on the physical processes that shaped the star formation history of massive galaxies over cosmic time. We made use of the near-infrared high-resolution imaging from th…
The (w)hole survey: An unbiased sample study of transition disk candidates based on Spitzer catalogs
van der Marel, N.; van Dishoeck, E. F.; Merín, B. +4 more
Understanding disk evolution and dissipation is essential for studies of planet formation. Transition disks, I.e., disks with large dust cavities and gaps, are promising candidates of active evolution. About two dozen candidates, selected by their spectral energy distribution (SED), have been confirmed to have dust cavities through millimeter inte…
Gaia Data Release 1. Principles of the photometric calibration of the G band
Jordi, C.; Balaguer-Núñez, L.; Evans, D. W. +24 more
Context. Gaia is an ESA cornerstone mission launched on 19 December 2013 aiming to obtain the most complete and precise 3D map of our Galaxy by observing more than one billion sources. This paper is part of a series of documents explaining the data processing and its results for Gaia Data Release 1, focussing on the G band photometry.
Aims: T…