Search Publications

Colour gradients in normal and compact early-type galaxies at 1 < z < 2

Longhetti, M.; Gargiulo, A.; Saracco, P.

We have derived colour gradients for a sample of 20 early-type galaxies (ETGs) at 1 < z_spec < 2 selected from the GOODS-South field. The sample includes both normal ETGs (13) having effective radii comparable to the mean radius of local ones and compact ETGs (seven) having effective radii from two to six times smaller. Colour grad…

Modeling of coronal mass ejections that caused particularly large geomagnetic storms using ENLIL heliosphere cone model

Odstrcil, D.; Kuznetsova, M.; Hesse, M. +3 more

In our previous paper we reported the results of modeling of 14 selected well-observed strong halo coronal mass ejection (CME) events using the WSA-ENLIL cone model combination. Cone model input parameters were obtained from white light coronagraph images of the CME events using the analytical method developed by Xie et al. (2004). This work verif…

A Discrete Ordinate, Multiple Scattering, Radiative Transfer Model of the Venus Atmosphere from 0.1 to 260µm

Lee, Christopher; Richardson, Mark Ian

Exospheres and Energetic Neutral Atoms of Mars, Venus and Titan

Chaufray, Jean-Yves; Futaana, Yoshifumi; Mura, Alessandro +5 more

Our understanding of the upper atmosphere of unmagnetized bodies such as Mars, Venus and Titan has improved significantly in this decade. Recent observations by in situ and remote sensing instruments on board Mars Express, Venus Express and Cassini have revealed characteristics of the neutral upper atmospheres (exospheres) and of energetic neutral…

In situ methods for measuring thermal properties and heat flux on planetary bodies

Banaszkiewicz, Marek; Spohn, Tilman; Knollenberg, Jörg +9 more

The thermo-mechanical properties of planetary surface and subsurface layers control to a high extent in which way a body interacts with its environment, in particular how it responds to solar irradiation and how it interacts with a potentially existing atmosphere. Furthermore, if the natural temperature profile over a certain depth can be measured…

A Magnetohydrodynamic Model of the 2006 December 13 Eruptive Flare

Fan, Y.

We present a three-dimensional magnetohydrodynamic simulation that qualitatively models the coronal magnetic field evolution associated with the eruptive flare that occurred on 2006 December 13 in the emerging δ-sunspot region NOAA 10930 observed by the Hinode satellite. The simulation is set up to drive the emergence of an east-west-oriented magn…

Identification of Three New Protoplanetary Nebulae Exhibiting the Unidentified Feature at 21 µm

Hora, Joseph L.; Fazio, Giovanni; Trigilio, Corrado +3 more

Among its great findings, the Infrared Astronomical Satellite mission showed the existence of an unidentified mid-IR feature around 21 µm. Since its discovery, this feature has been detected in all C-rich protoplanetary nebulae (PPNe) of intermediate spectral type (F-G) and—weakly—in a few PNe and asymptotic giant branch (AGB) stars, but the…

Initiation and Early Development of the 2008 April 26 Coronal Mass Ejection

Pick, M.; Auchère, F.; Démoulin, P. +3 more

We present a detailed study of a coronal mass ejection (CME) with high temporal cadence observations in radio and extreme-ultraviolet (EUV). The radio observations combine imaging of the low corona with radio spectra in the outer corona and interplanetary space. The EUV observations combine the three points of view of the STEREO and SOHO spacecraf…

AzTEC 1.1-mm images of 16 radio galaxies at 0.5 < z < 5.2 and a quasar at z= 6.3

Yun, M. S.; Kohno, K.; Humphrey, A. +12 more

We present 1.1-mm observations for a sample of 16 powerful radio galaxies at 0.5 < z < 5.2 and a radio-quiet quasar at z = 6.3, obtained using the AzTEC bolometer array mounted on the Atacama Submillimetre Telescope Experiment (ASTE) or the James Clerk Maxwell Telescope (JCMT). This paper more than doubles the number of high-z radio galaxies…

Properties of the nuclei and comae of 10 ecliptic comets from Hubble Space Telescope multi-orbit observations

Jorda, L.; Lamy, P. L.; A'Hearn, M. F. +2 more

We report on our on-going effort to detect and characterize cometary nuclei with the Hubble Space Telescope (HST). During cycle 9 (2000 July to 2001 June), we performed multi-orbit observations of 10 ecliptic comets with the Wide Field Planetary Camera 2. Nominally, eight contiguous orbits covering a time interval of ∼11 h were devoted to each com…