Search Publications
Consistency tests for Planck and WMAP in the low multipole domain
Frejsel, A.; Liu, H.; Hansen, M.
Recently, full sky maps from Planck have been made publicly available. In this paper, we do consistency tests for the three Planck CMB sky maps. We assume that the difference between two maps represents the contributions from systematics, noise, foregrounds and other sources, and that a precise representation of the Cosmic Microwave Background sho…
Studying the non-thermal lobes of IRAS 16547-4247 through a multi-wavelength approach
Iwasawa, K.; Paredes, J. M.; Munar-Adrover, P. +1 more
In recent years, massive protostars have turned out to be a possible population of high-energy emitters. Among the best candidates is IRAS 16547-4247, a protostar that presents a powerful outflow with clear signatures of interaction with its environment. This source has been revealed to be a potential high-energy source because it displays non-the…
Clustering of far-infrared galaxies in the AKARI All-Sky Survey
Oyabu, S.; Takeuchi, T. T.; Pollo, A. +1 more
We present the first measurement of the angular two-point correlation function for AKARI 90-µm point sources, detected outside of the Milky Way plane and other regions characterized by high Galactic extinction, and categorized as extragalactic sources according to our far-infrared-color based criterion (Pollo et al., 2010). This is the first…
Coherent structures and turbulent spectrum in solar wind plasmas
Sharma, R. P.; Yadav, N.; Kumari, Anju
The present paper investigates the localization of a uniform plane kinetic Alfvén wave (KAW) due to the coupling with the density/magnetic field fluctuations associated with a magnetosonic wave propagating in the transverse direction, i.e., perpendicular to the background magnetic field. To gain the physical insight into this evolution, a simplifi…
Variability of a stellar corona on a time scale of days. Evidence for abundance fractionation in an emerging coronal active region
Nordon, R.; Behar, E.; Drake, S. A.
Elemental abundance effects in active coronae have eluded our understanding for almost three decades, since the discovery of the first ionization potential (FIP) effect on the sun. The goal of this paper is to monitor the same coronal structures over a time interval of six days and resolve active regions on a stellar corona through rotational modu…
Relative Photometry of HAT-P-1b Occultations
Winn, Joshua N.; Gilliland, Ronald L.; Bakos, Gáspár Á. +4 more
We present Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph observations of two occultations of the transiting exoplanet HAT-P-1b. By measuring the planet to star flux ratio near opposition, we constrain the geometric albedo of the planet, which is strongly linked to its atmospheric temperature gradient. An advantage of HAT-P-1 as…
Is the Large Crater on the Asteroid (2867) Steins Really an Impact Crater?
Burchell, M. J.; Price, M. C.; Morris, A. J. W.
The large crater on the asteroid (2867) Steins attracted much attention when it was first observed by the Rosetta spacecraft in 2008. Initially, it was widely thought to be unusually large compared to the size of the asteroid. It was quickly realized that this was not the case and there are other examples of similar (or larger) craters on small bo…
Evidence of quiet-Sun chromospheric activity related to an emerging small-scale magnetic loop
Gömöry, P.; Puschmann, K. G.; Balthasar, H.
Aims: We investigate the temporal evolution of magnetic flux emergence in the quiet-Sun atmosphere close to disk center.
Methods: We combined high-resolution SoHO/MDI magnetograms with TRACE observations taken in the 1216 Å channel to analyze the temporal evolution of an emerging small-scale magnetic loop and its traces in the chromosphe…
Chemical and Physical Conditions in Molecular Cloud Core DC 000.4-19.5 (SL42) in Corona Australis
Juvela, M.; Whittet, D. C. B.; Harju, J. +3 more
Chemical reactions in starless molecular clouds are heavily dependent on interactions between gas phase material and solid phase dust and ices. We have observed the abundance and distribution of molecular gases in the cold, starless core DC 000.4-19.5 (SL42) in Corona Australis using data from the Swedish ESO Submillimeter Telescope. We present co…
Evidence of accretion triggered oscillations in the pre-main-sequence interacting binary AK Sco.
Talavera, A.; Lopez-Santiago, J.; Gomez de, C. A. I.
Pre-main sequence (PMS) binaries are surrounded by circumbinary discs from which matter falls on to both components. The material dragged from the circumbinary disc flows on to each star through independent streams channelled by the variable gravitational field. The action of the bar-like potential is most prominent in high eccentricity systems ma…