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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…
A detailed study of the L1641N star formation region
Olofsson, G.; Gâlfalk, M.
Aims: We search for young stellar objects (YSOs) in the L1641N cluster and characterize the star formation activity through determination of the age distribution, mass function, spatial distribution, and the star formation history.
Methods: Multi-wavelength broad band photometry both from space and the ground are used to look for IR excess in …
Predictions of the electrical conductivity and charging of the cloud particles in Jupiter's atmosphere
O'Brien, K.; Whitten, R. C.; Borucki, W. J. +1 more
The electrical conductivity and electrical charge on cloud particles (composed of ammonia, ammonium hydrosulfide, and water) in the atmosphere of Jupiter are computed for pressures between 5.5 and 0.1 bars. The source of ionization is galactic cosmic rays (GCR). The distribution of charge among the various reservoirs is a function of altitude and …
An Observation of Low-Level Heating in an Erupting Prominence
Landi, E.; Kucera, T. A.
Here we present multiwavelength observations of low-level heating in an erupting prominence observed in the UV and EUV over a wide range of temperatures and wavelengths by the Solar and Heliospheric Observatory (SOHO) Solar Ultraviolet Measurements of Emitted Radiation (SUMER) instrument and the Transition Region and Coronal Explorer (TRACE), and …