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Deep Optical Observations of Unusual Neutron Star Calvera with the GTC
Shibanov, Yury; Danilenko, Andrey; Zharikov, Sergey +2 more
Calvera is an unusual, isolated neutron star with a pure thermal X-ray spectrum typical of central compact objects in supernova remnants. On the other hand, its rotation period and spin-down rate are typical of ordinary rotation-powered pulsars. It was discovered and studied through X-rays, and has not yet been detected in other spectral domains. …
Spectroscopy at the Solar Limb: II. Are Spicules Heated to Coronal Temperatures?
Rezaei, R.; Puschmann, K. G.; Beck, C. +1 more
Spicules of the so-called type II were suggested to be relevant for coronal heating because of their ubiquity on the solar surface and their eventual extension into the corona. We investigate whether solar spicules are heated to transition-region or coronal temperatures and reach coronal heights (≫6 Mm) using multiwavelength observations of limb s…
DBI Galileon inflation in the light of Planck 2015
Sravan Kumar, K.; Bueno Sánchez, Juan C.; Escamilla-Rivera, Celia +2 more
In this work we consider a DBI Galileon (DBIG) inflationary model and constrain its parameter space with the Planck 2015 and BICEP2/Keck array and Planck (BKP) joint analysis data by means of a potential independent analysis. We focus our attention on inflationary solutions characterized by a constant or varying sound speed as well as warp factor.…
The ISW effect and the lack of large-angle CMB temperature correlations
Starkman, Glenn D.; Copi, Craig J.; O'Dwyer, Márcio
It is by now well established that the magnitude of the two-point angular-correlation function of the cosmic microwave background temperature anisotropies is anomalously low for angular separations greater than about 60°. Physics explanations of this anomaly typically focus on the properties of the Universe at the surface of last scattering, relyi…
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…