Search Publications
Herschel observations of the Herbig-Haro objects HH 52-54
Liseau, R.; Benedettini, M.; Justtanont, K. +11 more
Context. The emission from Herbig-Haro objects and supersonic molecular outflows is understood as cooling radiation behind shocks, which are initiated by a (proto-)stellar wind or jet. Within a given object, one often observes both dissociative (J-type) and non-dissociative (C-type) shocks, owing to the collective effects of internally varying sho…
Saturn's F ring grains: Aggregates made of crystalline water ice
Nicholson, Philip D.; Sotin, Christophe; Clark, Roger N. +8 more
We present models of the near-infrared (1-5 µm) spectra of Saturn's F ring obtained by Cassini's Visual and Infrared Mapping Spectrometer (VIMS) at ultra-high phase angles (177.4-178.5°). Modeling this spectrum constrains the size distribution, composition, and structure of F ring particles in the 0.1-100 µm size range. These spectra a…
Which haloes host Herschel-ATLAS galaxies in the local Universe?
Rodighiero, G.; Ivison, R. J.; Baugh, Carlton M. +40 more
We measure the projected cross-correlation between low-redshift (z < 0.5) far-infrared selected galaxies in the science demonstration phase (SDP) field of the Herschel-ATLAS (H-ATLAS) survey and optically selected galaxies from the Galaxy and Mass Assembly (GAMA) redshift survey. In order to obtain robust correlation functions, we restrict the …
Analysis of a Thaumasia Planum rift through automatic mapping and strain characterization of normal faults
Alegre Vaz, David
A new semi-automatic technique is presented to map and characterize tectonic features on Mars. Automatic strain estimation associated with normal faults is achieved for synthetic and real fault scarps on Mars. The application of this new technique to a small rift located in Thaumasia Planum allowed the segmentation of the rift. The defined segment…
Keck Spectroscopy of Lyman-break Galaxies and Its Implications for the UV-continuum and Lyα Luminosity Functions at z > 6
Ouchi, Masami; Shimasaku, Kazuhiro; Jiang, Linhua +6 more
We present Keck spectroscopic observations of z > 6 Lyman-break galaxy (LBG) candidates in the Subaru Deep Field (SDF). The candidates were selected as i'-dropout objects down to z' = 27 AB magnitudes from an ultra-deep SDF z'-band image. With the Keck spectroscopy we identified 19 LBGs with prominent Lyα emission lines at 6 <= z <= 6.4. …
Vector Magnetic Fields of A Solar Polar Region
Wang, Jingxiu; Jin, Chunlan
We study the vector magnetic fields of a solar polar region (PR) based on Solar Optical Telescope/Spectro-Polarimeter measurements. To better understand the polar magnetic properties, we compare the observed polar field with that in two solar quiet regions at the limb (QRL) and the disk center (QRD), and with that in a region of a low-latitude cor…
Evidence of the origin of the Hall magnetic field for reconnection: Hall MHD reconstruction results from Cluster observations
Eastwood, J. P.; Fazakerley, A. N.; Nakamura, R. +4 more
Using reconstruction results from Cluster observations in the magnetotail, we present observational evidence for the electron-current loops responsible for generating the out-of-plane Hall magnetic field during reconnection. This reconstruction is the first successful application to actual spacecraft data of a newly developed reconstruction techni…
The Star Formation Reference Survey. I. Survey Description and Basic Data
Sturm, E.; Barmby, P.; Zezas, A. +17 more
Star formation is arguably the most important physical process in the cosmos. It is a fundamental driver of galaxy evolution and the ultimate source of most of the energy emitted by galaxies in the local universe. A correct interpretation of star formation rate (SFR) measures is therefore essential to our understanding of galaxy formation and evol…
A Hubble Space Telescope/Cosmic Origins Spectrograph Search for Warm-hot Baryons in the Mrk 421 Sight Line
Shull, J. Michael; Danforth, Charles W.; Stocke, John T. +4 more
Thermally broadened Lyα absorbers (BLAs) offer an alternate method to using highly ionized metal absorbers (O VI, O VII, etc.) to probe the warm-hot intergalactic medium (WHIM, T = 105-107 K). Until now, WHIM surveys via BLAs have been no less ambiguous than those via far-UV and X-ray metal-ion probes. Detecting these weak, b…
Suzaku broad-band observations of the Seyfert 1 galaxies Mrk 509 and Mrk 841
Costantini, E.; Ponti, G.; Boisson, C. +5 more
Context. Markarian 509 and Markarian 841 are two bright Seyfert 1 galaxies with X-ray spectra characterised by a strong soft excess and a variable Fe Kα line, as shown by several X-ray observatories in the past.
Aims: We report an analysis and modelling of new Suzaku observations of these sources, taken between April and November, 2006, for M…