Search Publications
ALMA reveals the feeding of the Seyfert 1 nucleus in NGC 1566
Tacconi, L. J.; Hunt, L. K.; Krips, M. +9 more
We report ALMA observations of CO(3-2) emission in the Seyfert 1 galaxy NGC 1566, at a spatial resolution of 25 pc. Our aim is to investigate the morphology and dynamics of the gas inside the central kpc, and to probe nuclear fueling and feedback phenomena. NGC 1566 has a nuclear bar of 1.7 kpc radius and a conspicuous grand design spiral starting…
Planck 2013 results. VIII. HFI photometric calibration and mapmaking
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +226 more
This paper describes the methods used to produce photometrically calibrated maps from the Planck High Frequency Instrument (HFI) cleaned, time-ordered information. HFI observes the sky over a broad range of frequencies, from 100 to 857 GHz. To obtain the best calibration accuracy over such a large range, two different photometric calibration schem…
Reconstructing the density and temperature structure of prestellar cores from Herschel data: A case study for B68 and L1689B
Abergel, A.; Hill, T.; Roussel, H. +22 more
Utilizing multiwavelength dust emission maps acquired with Herschel, we reconstruct local volume density and dust temperature profiles for the prestellar cores B68 and L1689B using an inverse-Abel transform-based technique. We present intrinsic radial dust temperature profiles of starless cores directly from dust continuum emission maps disentangl…
Statistical survey of widely spread out solar electron events observed with STEREO and ACE with special attention to anisotropies
Gómez-Herrero, R.; Malandraki, O.; Dresing, N. +4 more
Context. In February 2011, the two STEREO spacecrafts reached a separation of 180 degrees in longitude, offering a complete view of the Sun for the first time ever. When the full Sun surface is visible, source active regions of solar energetic particle (SEP) events can be identified unambiguously. STEREO, in combination with near-Earth observatori…
Planck intermediate results. XVI. Profile likelihoods for cosmological parameters
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +182 more
We explore the 2013 Planck likelihood function with a high-precision multi-dimensional minimizer (Minuit). This allows a refinement of the ΛCDM best-fit solution with respect to previously-released results, and the construction of frequentist confidence intervals using profile likelihoods. The agreement with the cosmological results from the Bayes…
Gas structure inside dust cavities of transition disks: Ophiuchus IRS 48 observed by ALMA
van Dishoeck, Ewine F.; van der Marel, Nienke; Bruderer, Simon +1 more
Context. Transition disks are recognized by the absence of emission of small dust grains inside a radius of up to several 10s of AUs. Owing to the lack of angular resolution and sensitivity, the gas content of these dust holes has not yet been determined, but is of importance for constraining the mechanism leading to the dust holes. It is thought …
Planck intermediate results. XIII. Constraints on peculiar velocities
Dahle, H.; Miville-Deschênes, M. -A.; Bernard, J. -P. +182 more
Using Planck data combined with the Meta Catalogue of X-ray detected Clusters of galaxies (MCXC), we address the study of peculiar motions by searching for evidence of the kinetic Sunyaev-Zeldovich effect (kSZ). By implementing various filters designed to extract the kSZ generated at the positions of the clusters, we obtain consistent constraints …
Ubiquitous argonium (ArH+) in the diffuse interstellar medium: A molecular tracer of almost purely atomic gas
Menten, K. M.; Falgarone, E.; Godard, B. +14 more
Aims: We describe the assignment of a previously unidentified interstellar absorption line to ArH+ and discuss its relevance in the context of hydride absorption in diffuse gas with a low H2 fraction. The confidence of the assignment to ArH+ is discussed, and the column densities are determined toward several …
Indications for an influence of hot Jupiters on the rotation and activity of their host stars
Poppenhaeger, K.; Wolk, S. J.
Context. The magnetic activity of planet-hosting stars is an important factor for estimating the atmospheric stability of close-in exoplanets and the age of their host stars. It has long been speculated that close-in exoplanets can influence the stellar activity level. However, testing for tidal or magnetic interaction effects in samples of planet…
ALMA resolves turbulent, rotating [CII] emission in a young starburst galaxy at z = 4.8
Smail, Ian; Maiolino, Roberto; Caselli, Paola +9 more
We present spatially resolved Atacama Large Millimeter/submillimeter Array (ALMA) [Cii] observations of the z = 4.7555 submillimetre galaxy, ALESS 73.1. Our 0.̋5 FWHM map resolves the [Cii] emitting gas which is centred close to the active galactic nucleus (AGN). The gas kinematics are dominated by rotation but with high turbulence, vrot…