Search Publications
Rosetta fly-by at asteroid (21) Lutetia: An overview
Sierks, H.; Küppers, M.; Schulz, R. +1 more
On the journey to its target comet 67P/Churyumov-Gerasimenko the ESA Rosetta spacecraft had a close fly-by at the main-belt asteroid (21) Lutetia at a heliocentric distance of r=2.72 AU, and a geocentric distance of Δ=3.05 AU. Closest approach occurred on 10 July 2010, 15:45 UT at a distance of ∼3170 km. Rosetta passed the asteroid with a relative…
A deep ATCA 20 cm radio survey of the AKARI Deep Field South near the South Ecliptic Pole
Goto, Tomotsugu; Nakagawa, Takao; Shirahata, Mai +18 more
The results of a deep radio survey at 20 cm wavelength are reported for a region containing the AKARI Deep Field South (ADF-S) near the South Ecliptic Pole (SEP), using the Australia Telescope Compact Array (ATCA). The survey (hereafter referred to as the ATCA-ADFS survey) has 1σ detection limits ranging from 18.7 to 50 µJy beam-1…
HST/ACS Photometry of Old Stars in NGC 1569: The Star Formation History of a nearby Starburst
Aloisi, Alessandra; van der Marel, Roeland P.; Tosi, Monica +3 more
We used Hubble Space Telescope/Advanced Camera for Surveys to obtain deep V- and I-band images of NGC 1569, one of the closest and strongest starburst galaxies in the universe. These data allowed us to study the underlying old stellar population, aimed at understanding NGC 1569's evolution over a full Hubble time. We focus on the less-crowded oute…
Detection and Tracking of Subtle Cloud Features on Uranus
Sromovsky, L. A.; Fry, P. M.; Hammel, H. B. +2 more
The recently updated Uranus zonal wind profile (Sromovsky et al.) samples latitudes from 71° S to 73° N. But many latitudes remain grossly undersampled (outside 20°-45° S and 20°-50° N) due to a lack of trackable cloud features. Offering some hope of filling these gaps is our recent discovery of low-contrast cloud that can be revealed by imaging a…
Empirical constraints of supergalactic winds at z≳ 0.5
Chen, Hsiao-Wen; Gauthier, Jean-René
Under the hypothesis that Mg II absorbers found near the minor axis of a disc galaxy originate in the cool phase of supergalactic winds, we carry out a study to constrain the properties of large-scale galactic outflows at redshift zgal ≳ 0.5 based on the observed relative motions of individual absorbing clouds with respect to the positi…
Herschel-ATLAS: the far-infrared properties and star formation rates of broad absorption line quasi-stellar objects
Ivison, R. J.; Clements, D. L.; Cooray, A. +20 more
We have used data from the Herschel Astrophysical Terahertz Large-Area Survey (H-ATLAS) at 250, 350 and 500 µm to determine the far-infrared (FIR) properties of 50 broad absorption line quasars (BAL QSOs). Our sample contains 49 high-ionization BAL QSOs (HiBALs) and one low-ionization BAL QSO (LoBAL) which are compared against a sample of 32…
Energetic electron observations of Rhea’s magnetospheric interaction
Gurnett, D. A.; Persoon, A. M.; Krupp, N. +12 more
Saturn’s moon Rhea is thought to be a simple plasma absorber, however, energetic particle observations in its vicinity show a variety of unexpected and complex interaction features that do not conform with our current understanding about plasma absorbing interactions. Energetic electron data are especially interesting, as they contain a series of …
Optical TiO and VO Band Emission in Two Embedded Protostars: IRAS 04369+2539 and IRAS 05451+0037
Hillenbrand, Lynne A.; Knapp, Gillian R.; Rebull, Luisa M. +2 more
Archival spectra from the Sloan Digital Sky Survey of two optically faint flat-spectrum protostars, IRAS 04369+2539 and IRAS 05451+0037, show strong emission-line features including—notably—clear and broad emission across several molecular bands of TiO and VO. The molecular emission is indicative of dense, warm circumstellar gas and has been seen …
The oblique impact Hale and its consequences on Mars
Schultz, Peter H.; Wrobel, Kelly E.
Highly oblique impacts represent a rare and special class of impact events manifested as elliptical craters preserved on present-day planetary surfaces. Crater excavation in highly oblique impacts differs from that of standard vertical impacts due to early time asymmetries imparted by the downrange-directed coupling of energy between the projectil…
Radiative equilibrium in solar prominences reconsidered
Heinzel, P.; Anzer, U.
Aims: We reconsider the question which kinetic temperatures can lead to prominence configurations that are in radiative equilibrium. We compare these temperatures to those from other calculations.
Methods: For this purpose we solved the full non-LTE radiative-transfer problem for a gas consisting of hydrogen, helium and calcium. We used …