Search Publications
Synthetic Spectrum Constraints on a Model of the Cataclysmic Variable QU Carinae
Szkody, Paula; Sion, Edward M.; Godon, Patrick +3 more
Neither standard model SEDs nor truncated standard model SEDs fit observed spectra of QU Carinae with acceptable accuracy over the range 900-3000 Å. Nonstandard model SEDs fit the observation set accurately. The nonstandard accretion disk models have a hot region extending from the white dwarf to R = 1.36RWD, a narrow intermediate-tempe…
The variation of Io's auroral footprint brightness with the location of Io in the plasma torus
Clarke, John T.; Serio, Andrew W.
Ultraviolet and near-infrared observations of auroral emissions from the footprint of Io's magnetic Flux Tube (IFT) mapping to Jupiter's ionosphere have been interpreted via a combination of the unipolar inductor model [Goldreich, P., Lynden-Bell, D., 1969. Astrophys. J. 156, 59-78] and the multiply-reflected Alfvén wave model [ Belcher, J.W., 198…
Titan's magnetic field signature during the Cassini T34 flyby: Comparison between hybrid simulations and MAG data
Dougherty, M. K.; Glassmeier, K. -H.; Bertucci, C. +3 more
During the T34 flyby on 19 July 2007, the Cassini spacecraft passed through the magnetic pile-up region at Titan's ramside. The magnetic environment of Titan during this flyby is studied using a three-dimensional hybrid simulation model. This approach treats the electrons of the plasma as a massless, charge-neutralizing fluid, whereas the effects …
Variations of the solar acoustic high-degree mode frequencies over solar cycle 23
Schou, J.; Rabello-Soares, M. C.; Korzennik, Sylvain G.
Using full-disk observations obtained with the Michelson Doppler Imager (MDI) on board the Solar and Heliospheric Observatory (SOHO) spacecraft, we present variations of the solar acoustic mode frequencies caused by the solar activity cycle. High-degree (100 < ℓ < 900) solar acoustic modes were analyzed using global helioseismology analysis …
Radio Observations of the Hubble Deep Field-South Region. Iv. Optical Properties of the Faint Radio Population
Norris, Ray P.; Huynh, Minh T.; Jackson, Carole A. +1 more
The Australia Telescope Hubble Deep Field-South (ATHDF-S) survey of the Hubble Deep Field-South (HDF-S) reaches sensitivities of ~10 µJy at 1.4, 2.5, 5.2, and 8.7 GHz, making the ATHDF-S one of the deepest surveys ever performed with the Australia Telescope Compact Array (ATCA). Here, we present the optical identifications of the ATHDF-S rad…
Suzaku Observation of G359.79-0.26, a New Supernova Remnant Candidate in the Galactic Center
Mori, Hideyuki; Koyama, Katsuji; Tsuru, Takeshi Go +2 more
Utilizing Suzaku observations, we obtained the X-ray spectrum of G359.79-0.26, an extended X-ray feature nearby the Galactic center (GC) supernova remnant (SNR) SgrA East. We estimated the contribution from the Galactic center diffuse X-rays, which allows us a proper background subtraction from the faint extended source. A thin thermal plasma with…
Is Enceladus' plume tidally controlled?
Halevy, I.; Stewart, S. T.
Explanations for the plume of gas, water vapor and ice particles jetting from rifts in Enceladus' south polar region include boiling of liquid water and dissociation of clathrate hydrates. In either case, production of the plume may be quasi-static or tidally controlled, with implications for the interior structure and composition of Enceladus. Pr…
Off-limb EUV observations of the solar corona and transients with the CORONAS-F/SPIRIT telescope-coronagraph
Slemzin, V.; Kuzin, S.; Zhitnik, I. +4 more
The SPIRIT telescope aboard the CORONAS-F satellite (in orbit from 26 July 2001 to 5 December 2005), observed the off-limb solar corona in the 175 Å (Fe IX, X and XI lines) and 304 Å (He II and Si XI lines) bands. In the coronagraphic mode the mirror was tilted to image the corona at the distance of 1.1...5 Rsun from the solar center, t…
Star formation in the Trifid Nebula. Cores and filaments
Cernicharo, J.; Lefloch, B.; Pardo, J. R.
Aims: We aim to characterize the properties of the prestellar and protostellar condensations to understand the star formation processes at work in a young HII region
Methods: We have obtained maps of the 1.25 mm thermal dust emission and the molecular gas emission over a region of 20' × 10' around the Trifid Nebula (M 20), with the IRAM 30 m a…
A Hubble Space Telescope Survey of the Disk Cluster Population of M31. II. Advanced Camera for Surveys Pointings
Hodge, P. W.; Krienke, O. K.
This paper reports on a survey of star clusters in M31 based on archival images from the Hubble Space Telescope. Paper I reported results from images obtained with the Wide Field Planetary Camera 2 (WFPC2) and this paper reports results from the Advanced Camera for Surveys (ACS). The ACS survey has yielded a total of 339 star clusters, 52 of which…