Search Publications
A mature cluster with X-ray emission at z = 2.07
Finoguenov, A.; Cimatti, A.; Daddi, E. +10 more
We report evidence of a fully established galaxy cluster at z = 2.07, consisting of a ~20σ overdensity of red, compact spheroidal galaxies spatially coinciding with extended X-ray emission detected with XMM-Newton. We use VLT VIMOS and FORS2 spectra and deep Subaru, VLT and Spitzer imaging to estimate the redshift of the structure from a prominent…
Planck early results. XXIV. Dust in the diffuse interstellar medium and the Galactic halo
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +205 more
This paper presents the first results from a comparison of Planck dust maps at 353, 545 and 857GHz, along with IRAS data at 3000 (100 µm) and 5000GHz (60 µm), with Green Bank Telescope 21-cm observations of Hi in 14 fields covering more than 800 deg2 at high Galactic latitude. The main goal of this study is to estimate the f…
Non-standard grain properties, dark gas reservoir, and extended submillimeter excess, probed by Herschel in the Large Magellanic Cloud
Bernard, J. -P.; Reach, W. T.; Lebouteiller, V. +13 more
Context.Herschel provides crucial constraints on the IR SEDs of galaxies, allowing unprecedented accuracy on the dust mass estimates. However, these estimates rely on non-linear models and poorly-known optical properties.
Aims: In this paper, we perform detailed modelling of the Spitzer and Herschel observations of the LMC, in order to: (i) s…
Photospheric flux cancellation and associated flux rope formation and eruption
Green, L. M.; Kliem, B.; Wallace, A. J.
Aims: We study an evolving bipolar active region that exhibits flux cancellation at the internal polarity inversion line, the formation of a soft X-ray sigmoid along the inversion line and a coronal mass ejection. The aim is to investigate the quantity of flux cancellation that is involved in flux rope formation in the time period leading up …
Planck early results. XX. New light on anomalous microwave emission from spinning dust grains
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +213 more
Anomalous microwave emission (AME) has been observed by numerous experiments in the frequency range ~10-60 GHz. Using Planck maps and multi-frequency ancillary data, we have constructed spectra for two known AME regions: the Perseus and ρ Ophiuchi molecular clouds. The spectra are well fitted by a combination of free-free radiation, cosmic microwa…
Search for brown-dwarf companions of stars
Zucker, S.; Queloz, D.; Sahlmann, J. +7 more
Context. The frequency of brown-dwarf companions in close orbit around Sun-like stars is low compared to the frequency of planetary and stellar companions. There is presently no comprehensive explanation of this lack of brown-dwarf companions.
Aims: By combining the orbital solutions obtained from stellar radial-velocity curves and Hipparcos …
Planck early results. XXIII. The first all-sky survey of Galactic cold clumps
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +202 more
We present the statistical properties of the Cold Clump Catalogue of Planck Objects (C3PO), the first all-sky catalogue of cold objects, in terms of their spatial distribution, dust temperature, distance, mass, and morphology. We have combined Planck and IRAS data to extract 10342 cold sources that stand out against a warmer environment. The sourc…
The Sun as a star: observations of white-light flares
Kretzschmar, M.
Context. Solar flares radiate energy at all wavelengths, but the spectral distribution of this energy is still poorly known. White-light continuum emission is sometimes observed, and these flares are then called "white-light flares" (WLFs).
Aims: We investigate if all flares are WLFs and how the radiated energy is distributed spectrally.
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Building the cosmic infrared background brick by brick with Herschel/PEP
Berta, S.; Magnelli, B.; Nordon, R. +24 more
The cosmic infrared background (CIB) includes roughly half of the energy radiated by all galaxies at all wavelengths across cosmic time, as observed at the present epoch. The PACS Evolutionary Probe (PEP) survey is exploited here to study the CIB and its redshift differential, at 70, 100 and 160 µm, where the background peaks. Combining PACS…
The 44Ti-powered spectrum of SN 1987A
Fransson, C.; Jerkstrand, A.; Kozma, C.
SN 1987A provides a unique opportunity to study the evolution of a supernova from explosion into very late phases. Owing to the rich chemical structure, the multitude of physical processes involved and extensive radiative transfer effects, detailed modeling is needed to interpret the emission from this and other supernovae. In this paper, we analy…