Search Publications
Active galactic nuclei in the mid-IR. Evolution and contribution to the cosmic infrared background
Pozzi, F.; Gruppioni, C.; Zamorani, G. +3 more
Aims.We study the evolution of the luminosity function (LF) of type-1 and type-2 Active Galactic Nuclei (AGN) in the mid-infrared, derive the contribution of the AGN to the Cosmic InfraRed Background (CIRB) and the expected source counts to be observed by Spitzer at 24 µm. Methods: We used a sample of type-1 and type-2 AGN selected at 15 &mi…
Multiwavelength Study of Flow Fields in Flaring Super Active Region NOAA 10486
Xu, Yan; Cao, Wenda; Liu, Chang +5 more
We present high-resolution observations of horizontal flow fields measured by local correlation tracking from intensity images in three wavelengths, i.e., G band (GB), white light (WL), and near-infrared (NIR). The observations were obtained on 2003 October 29 within the flaring super active region NOAA 10486, which was the source of several X-cla…
A new population of planetary nebulae discovered in the Large Magellanic Cloud - I. Preliminary sample
Parker, Quentin A.; Reid, Warren. A.
We report our initial discovery of 73 new planetary nebulae (PNe) in the Large Magellanic Cloud (LMC) following confirmatory 2dF spectroscopy on the Anglo-Australian Telescope. Preliminary candidate sources come from a 10 per cent sub-area of our new deep, high-resolution Hα map of the central 25deg2 of the LMC obtained with the UK Schm…
Electric properties and related physical characteristics of the atmosphere and surface of Titan
Lara, L. M.; Rodrigo, R.; López-Moreno, J. J. +17 more
The permittivity, waves and altimetry (PWA) instrument was designed for the investigation of the electric properties and other related physical characteristics of the atmosphere of Titan, from an altitude around 140 km down to the surface. PWA carried sensors to measure the atmospheric conductivity, and record electromagnetic and acoustic waves up…
HST NICMOS Imaging of the Planetary-mass Companion to the Young Brown Dwarf 2MASSW J1207334-393254
Zuckerman, B.; Song, Inseok; Schneider, G. +5 more
Multiband (0.9-1.6 µm) images of the TW Hydrae association (TWA) brown dwarf 2MASSW J1207334-393254 (also known as 2M 1207) and its candidate planetary-mass companion (2M 1207b) were obtained on 2004 August 28 and 2005 April 26 with HST NICMOS. The images from these two epochs unequivocally confirm the two objects as a common proper motion p…
Observations of a soft X-ray rising loop associated with a type II burst and a coronal mass ejection in the 03 November 2003 X-ray flare
Krucker, S.; Vilmer, N.; Dauphin, C.
Context: .We report observations of a type II burst - the signature of a shock wave - starting at the unusual high frequency of 650 MHz during the 03 November 2003 flare. This flare is associated with the propagation of a soft X-ray coronal loop and with a coronal mass ejection (CME).
Aims: .We study in this paper the origin of the shock wave …
An XMM-Newton observation of the young open cluster NGC 2547: coronal activity at 30 Myr
Briggs, K. R.; Jeffries, R. D.; Evans, P. A. +1 more
We report on XMM-Newton observations of the young open cluster NGC 2547 which allow us to characterize coronal activity in solar-type stars, and stars of lower mass, at an age of 30 Myr. X-ray emission is seen from stars at all spectral types, peaking among G stars at luminosities (0.3-3 keV) of Lx≃ 1030.5 erg s-1 …
Electric fields within the martian magnetosphere and ion extraction: ASPERA-3 observations
Kallio, E.; Fedorov, A.; Säles, T. +37 more
Observations made by the ASPERA-3 experiment onboard the Mars Express spacecraft found within the martian magnetosphere beams of planetary ions. In the energy ( E/q)-time spectrograms these beams are often displayed as dispersive-like, ascending or descending (whether the spacecraft moves away or approach the planet) structures. A linear dependenc…
First results from the ionospheric radio occultations of Saturn by the Cassini spacecraft
Anabtawi, Aseel; Barbinis, Elias; Fleischman, Don +9 more
The first set of near-equatorial occultations of the Saturn ionosphere was obtained by the Cassini spacecraft between May and September of 2005. The occultations occurred at near-equatorial latitudes, between 10°N and 10°S, at solar zenith angles from about 84° to 96°. The entry observations correspond to dusk conditions and the exit ones to dawn.…
From Radio to X-Ray: The Quiescent Atmosphere of the dMe Flare Star EV Lacertae
Hawley, Suzanne L.; Harper, Graham M.; Brown, Alexander +3 more
We report on multiwavelength observations spanning radio to X-ray wavelengths of the M dwarf flare star EV Lacertae and probing the characteristics of the outer atmospheric plasma from the upper chromosphere to the corona. We detect the star at a wavelength of 2 cm (15 GHz) for the first time. UV and FUV line profiles show evidence of nonthermal b…