Search Publications
Far-infrared/submillimetre properties of pre-stellar cores L1521E, L1521F and L1689B as revealed by the Herschel SPIRE instrument - I. Central positions
Abergel, A.; Ward-Thompson, D.; van der Wiel, M. H. D. +5 more
Dust grains play a key role in the physics of star-forming regions, even though they constitute only ∼1 per cent of the mass of the interstellar medium. The derivation of accurate dust parameters such as temperature (Td), emissivity spectral index (β) and column density requires broad-band continuum observations at far-infrared waveleng…
On the Relation between the Mysterious 21 µm Emission Feature of Post-asymptotic Giant Branch Stars and Their Mass-loss Rates
Li, Aigen; Jiang, B. W.; Mishra, Ajay
Over two decades ago, a prominent, mysterious emission band peaking at ∼20.1 µm was serendipitously detected in four preplanetary nebulae (PPNe; also known as “protoplanetary nebulae”). To date, this spectral feature, designated as the “21 µm” feature, has been seen in 27 carbon-rich PPNe in the Milky Way and the Magellanic Clouds. The…
Herschel-HIFI view of mid-IR quiet massive protostellar objects
Braine, J.; Bontemps, S.; van Dishoeck, E. F. +9 more
Aims: We present Herschel/HIFI observations of 14 water lines in a small sample of Galactic massive protostellar objects: NGC 6334I(N), DR21(OH), IRAS 16272-4837, and IRAS 05358+3543. Using water as a tracer of the structure and kinematics, we individually study each of these objects with the aim to estimate the amount of water around them, b…
Modelling the structure of molecular clouds - I. A multiscale energy equipartition
Klessen, Ralf S.; Veltchev, Todor V.; Donkov, Sava
We present a model for describing the general structure of molecular clouds (MCs) at early evolutionary stages in terms of their mass-size relationship. Sizes are defined through threshold levels at which equipartitions between gravitational, turbulent and thermal energy |W| ∼ f(Ekin + Eth) take place, adopting interdependent…
A new model of the microwave polarized sky for CMB experiments
Bonaldi, Anna; Brown, Michael L.; Hervías-Caimapo, Carlos
We present a new model of the microwave sky in polarization that can be used to simulate data from cosmic microwave background polarization experiments. We exploit the most recent results from the Planck satellite to provide an accurate description of the diffuse polarized foreground synchrotron and thermal dust emission. Our model can include the…
The SESAME/CASSE instrument listening to the MUPUS PEN insertion phase on comet 67P/Churyumov-Gerasimenko
Schmidt, W.; Knollenberg, J.; Knapmeyer, M. +7 more
After the final landing of Philae at the Abydos site on comet 67/P Churyumov-Gerasimenko, the MUPUS (Multipurpose Sensors for Surface and Sub-Surface Science) device started hammering itself into the cometary ground on 14th November 2014, and continued hammering for more than 3 h. During this period, the CASSE (Comet Acoustic Surface Sounding Expe…
A large active wave trapped in Jupiter's equator
Sánchez-Lavega, A.; García-Melendo, E.; Gómez-Forrellad, J. M. +2 more
Context. A peculiar atmospheric feature was observed in the equatorial zone (EZ) of Jupiter between September and December 2012 in ground-based and Hubble Space Telescope (HST) images. This feature consisted of two low albedo Y-shaped cloud structures (Y1 and Y2) oriented along the equator and centred on it (latitude 0.5°-1°N).
Aims: We wante…
Near-infrared Circular and Linear Polarimetry of Monoceros R2
Kwon, Jungmi; Nagata, Tetsuya; Tamura, Motohide +2 more
We have conducted simultaneous JHK s -band imaging circular and linear polarimetry of the Monoceros R2 (Mon R2) cluster. We present results from deep and wide near-infrared linear polarimetry of the Mon R2 region. Prominent and extended polarized nebulosities over the Mon R2 field are revisited, and an infrared reflection nebula associ…
Additional spectroscopic redshift measurements for galaxy clusters from the first Planck catalogue
Aghanim, N.; Melnikov, S. S.; Irtuganov, E. N. +10 more
We present the results of spectroscopic redshift measurements for the galaxy clusters from the first all-sky Planck catalogue that have been mostly identified based on the optical observations performed previously by our team (Planck Collaboration 2015a). Data on 13 galaxy clusters at redshifts from z ≈ 0.2 to z ≈ 0.8, including the improved ident…
Minute pulsations in microwaves and X-rays during the flare on May 6, 2005
Kupriyanova, E. G.; Ratcliffe, H.
Quasi-periodic pulsations are a common feature in the emission associated with solar flares. In particular, pulsations with periods of tens of seconds to a few minutes are often seen in microwave and hard X-ray emission. We examine the spatial and temporal structure of the emission during the flare on May 6, 2005. The source of the flare is a magn…