Search Publications
QuickPol: Fast calculation of effective beam matrices for CMB polarization
Ponthieu, Nicolas; Hivon, Eric; Mottet, Sylvain
Current and planned observations of the cosmic microwave background (CMB) polarization anisotropies, with their ever increasing number of detectors, have reached a potential accuracy that requires a very demanding control of systematic effects. While some of these systematics can be reduced in the design of the instruments, others will have to be …
Using red clump stars to correct the Gaia DR1 parallaxes
Chaplin, William J.; Davies, Guy R.; Girardi, Léo +14 more
Recent results have suggested that there is tension between the Gaia DR1 TGAS distances and the distances obtained using luminosities determined by eclipsing binaries or asteroseismology on red giant stars. We use the Ks-band luminosities of red clump stars, identified and characterized by asteroseismology, to make independent distance …
Massive pre-main-sequence stars in M17
Kaper, L.; de Koter, A.; Sana, H. +6 more
The formation process of massive stars is still poorly understood. Massive young stellar objects (mYSOs) are deeply embedded in their parental clouds; these objects are rare, and thus typically distant, and their reddened spectra usually preclude the determination of their photospheric parameters. M17 is one of the best-studied H II regions in the…
VLT/MUSE illuminates possible channels for Lyman continuum escape in the halo of SBS 0335-52E
Östlin, G.; Hayes, M.; Melinder, J. +4 more
We report on the discovery of ionised gas filaments in the circum-galactic halo of the extremely metal-poor compact starburst SBS 0335-052E in a 1.5 h integration with the MUSE integral-field spectrograph. We detect these features in Hα and [O III] emission down to a limiting surface-brightness of 5 × 10-19 erg s-1 cm-2<…
NH3 (10-00) in the pre-stellar core L1544
Codella, C.; Pagani, L.; van Dishoeck, E. F. +11 more
Pre-stellar cores represent the initial conditions in the process of star and planet formation, therefore it is important to study their physical and chemical structure. Because of their volatility, nitrogen-bearing molecules are key to study the dense and cold gas present in pre-stellar cores. The NH3 rotational transition detected wit…
Star formation and gas flows in the centre of the NUGA galaxy NGC 1808 observed with SINFONI
Eckart, Andreas; Combes, Françoise; Busch, Gerold +4 more
The EBLM project. III. A Saturn-size low-mass star at the hydrogen-burning limit
Smalley, Barry; Hellier, Coel; Triaud, Amaury H. M. J. +19 more
We report the discovery of an eclipsing binary system with mass-ratio q ∼ 0.07. After identifying a periodic photometric signal received by WASP, we obtained CORALIE spectroscopic radial velocities and follow-up light curves with the Euler and TRAPPIST telescopes. From a joint fit of these data we determine that EBLM J0555-57 consists of a sun-lik…
Planck intermediate results. LII. Planet flux densities
Kim, J.; Miville-Deschênes, M. -A.; Boulanger, F. +147 more
Measurements of flux density are described for five planets, Mars, Jupiter, Saturn, Uranus, and Neptune, across the six Planck High Frequency Instrument frequency bands (100-857 GHz) and these are then compared with models and existing data. In our analysis, we have also included estimates of the brightness of Jupiter and Saturn at the three frequ…
The Herschel Virgo Cluster Survey. XX. Dust and gas in the foreground Galactic cirrus
Boquien, M.; Bianchi, S.; Fritz, J. +22 more
We study the correlation between far-infrared/submm dust emission and atomic gas column density in order to derive the properties of the high Galactic latitude, low density, Milky Way cirrus in the foreground of the Virgo cluster of galaxies. Dust emission maps from 60 to 850 µm are obtained from observations with the Spectral and Photometri…
(Sub)millimetre interferometric imaging of a sample of COSMOS/AzTEC submillimetre galaxies. III. Environments
Finoguenov, A.; Ilbert, O.; Smolčić, V. +20 more
We investigate the environment of 23 submillimetre galaxies (SMGs) drawn from a signal-to-noise (S/N)-limited sample of SMGs originally discovered in the James Clerk Maxwell Telescope (JCMT)/AzTEC 1.1 mm continuum survey of a Cosmic Evolution Survey (COSMOS) subfield and then followed up with the Submillimetre Array and Plateau de Bure Interferome…