Search Publications
Intermediate-Age Clusters in a Field Containing M31 and M32 Stars
Mateo, Mario; Worthey, Guy; Rudenko, Pavlo
Hubble Space Telescope/Advanced Camera for Surveys fields toward M31 and M32 were examined for the presence of possible star clusters. On the basis of stellar photometry, two intermediate-age clusters were found in the field that contains both M31 and M32 stars. One is approximately 200 Myr of age with a mass ~400 M sun, and the other i…
Application of Photoconductor Physical Transient Model to Fourier Transform Spectrometer Data of AKARI/Far-Infrared Surveyor (FIS)
Coulais, A.; Takahashi, H.; Okada, Y. +8 more
AKARI carries on board the Fourier transform spectrometer (FTS) with the gallium-doped germanium (Ge:Ga) photoconductor arrays of the far-infrared surveyor (FIS). Ge:Ga photoconductors are the most sensitive detectors for far-infrared satellite instruments. However, the performance of these detectors is known to be severely influenced by undesirab…
A novel metric for coronal MHD models
Wiltberger, M.; de Toma, G.; Riley, P. +6 more
In the interest of quantitatively assessing the capabilities of coronal MHD models, we have developed a metric that compares the structures of the white light corona observed with SOHO LASCO C2 to model predictions. The MAS model is compared to C2 observations from two Carrington rotations during solar cycle 23, CR1913 and CR1984, which were near …
UV Transient Brightenings Associated with a Coronal Mass Ejection
Romoli, M.; Poletto, G.; Schettino, G.
In this paper, we analyze transient UV brightenings in spectra acquired by SOHO/UltraViolet Coronagraph Spectrometer (UVCS) on 2003 June 2 in association with a coronal mass ejection (CME) that occurred at the West limb of the Sun at 08:54 UT. Brightenings have been observed in lines from cool (C III, O VI), intermediate (Si VIII, Si XII), and hig…
Infrared Sky Surveys
Price, Stephan D.
A retrospective is given on infrared sky surveys from Thomas Edison’s proposal in the late 1870s to IRAS, the first sensitive mid- to far-infrared all-sky survey, and the mid-1990s experiments that filled in the IRAS deficiencies. The emerging technology for space-based surveys is highlighted, as is the prominent role the US Defense Department, pa…
An analysis of VLF electric field spectra measured in Titan's atmosphere by the Huygens probe
Morente, Juan A.; Portí, Jorge A.; Blanchard, Cedric +2 more
A numerical simulation of Titan's electromagnetic cavity in the VLF band is carried out using the Transmission Line Matrix (TLM) method, with the aim of assessing the VLF electric field spectra sent by the Huygens probe. In an Earth-like model, successive peaks would be expected in the spectra, associated with multiple reflections of the electroma…
No satellites detected around 21 Lutetia
Kulkarni, Shrinivas R.; Busch, Michael W.; Conrad, Al
The Asteroid 21 Lutetia is the target of a flyby by the Rosetta spacecraft in mid-2010. We observed Lutetia with the Keck adaptive-optics system, and searched for satellites. We find none, to a flux limit of 1/350 (Δ-mag = 6.4), corresponding to a size limit of roughly 6 km, at a separation of 0.15″ (3 primary radii or 0.006 Hill radii).
Correction to “Plasma environment of Venus: Comparison of Venus Express ASPERA-4 measurements with 3-D hybrid simulations”
Barabash, S.; Lundin, R.; Krupp, N. +13 more
Abstract Available from http://www.agu.org
Emergence and cancellation of small-scale magnetic flux in a quiet region
Zhang, Jun; Jin, Chunlan
This paper studies the relationship between the development of granules and emergence (cancellation) of magnetic flux at small spatial scales (∼1″) in a quiet region taken with the spectro-polarimeter (SP) of the Solar Optical Telescope (SOT) aboard the Hinode satellite. By examining 6 granular cell events, we have uncovered that a granular struct…
The nature of the near-infrared core source in 3C 433
Sparks, W. B.; Tadhunter, C. N.; Axon, D. +4 more
We report the analysis of near-infrared (near-IR) imaging, polarimetric and spectroscopic observations of the powerful radio galaxy 3C 433 (z = 0.1016), obtained with the Hubble Space Telescope (HST) and the United Kingdom Infrared Telescope. The high spatial resolution of HST allows us to study the near-nuclear regions of the galaxy (<1 kpc). …