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Galaxy populations in the Antlia cluster - II. Compact elliptical galaxy candidates
Richtler, Tom; Faifer, Favio R.; Smith Castelli, Analía V. +1 more
Continuing our study of galaxy populations in the Antlia cluster, we present a photometric analysis of four galaxies classified as compact elliptical (cE) galaxies in the 1990 Antlia Group catalogue of Ferguson and Sandage. Until now, there have been only six known members of this rare type of galaxy. Using data from various photometric systems (W…
Relationship between solar wind corotating interaction regions and the phasing and intensity of Saturn kilometric radiation bursts
Cecconi, B.; Lamy, L.; Badman, S. V. +2 more
Voyager spacecraft measurements of Saturn kilometric radiation (SKR) identified two features of these radio emissions: that they pulse at a period close to the planetary rotation period, and that the emitted intensity is correlated with the solar wind dynamic pressure (Desch and Kaiser, 1981; Desch, 1982; Desch and Rucker, 1983). In this study the…
Determination of Magnetic Diffusivity from High-Resolution Solar Magnetograms
Chae, Jongchul; Litvinenko, Yuri E.; Sakurai, Takashi
The magnetic diffusivity in the solar photosphere is determined by applying a new method to the magnetic induction equation. The magnetic field evolution is specified by a time sequence of high-resolution magnetograms of plage regions, taken by Hinode/SOT and SOHO/MDI. The mean value of magnetic diffusivity determined from SOT magnetograms with th…
Probing the Subsurface Structures of Active Regions with Ring-Diagram Analysis
Basu, Sarbani; Antia, H. M.; Bogart, Richard S. +1 more
We analyze the variations in the near-surface profiles of sound speed and adiabatic constant between active regions and neighboring quiet-Sun areas using the technique of ring-diagram analysis and inversions of the frequency differences between the regions. This approach minimizes the systematic observational effects on the fitted spectral model p…
The environmental dependence of properties of galaxies around the RDCSJ0910+54 cluster at z = 1.1
Finoguenov, A.; Morokuma, T.; Tanaka, M. +6 more
We report on the environmental dependence of properties of galaxies around the RDCSJ0910+54 cluster at z=1.1. We obtained multi-band wide-field images of the cluster with Suprime-Cam and MOIRCS on Subaru and WFCAM on UKIRT. Also, an intensive spectroscopic campaign was carried out using LRIS on Keck and FOCAS on Subaru. We collected 161 spectra wi…
The Optical Spectra of 24 µm Galaxies in the COSMOS Field. I. Spitzer MIPS Bright Sources in the zCOSMOS-Bright 10k Catalog
Kneib, J. -P.; Maccagni, D.; Aussel, H. +62 more
We study zCOSMOS-bright optical spectra for 609 Spitzer MIPS 24 µm-selected galaxies with S24 µ m > 0.30 mJy and I < 22.5 (AB mag) over 1.5 deg2 of the COSMOS field. From emission-line diagnostics we find the following: (1) SFRs derived from the observed Hα λ6563 and Hβ λ4861 lines underestimate, on average,…
Venus upper atmosphere winds from ground-based heterodyne spectroscopy of CO 2 at 10µm wavelength
Sornig, M.; Livengood, T.; Sonnabend, G. +4 more
We report observations of Venus atmospheric wind near 110 km altitude by means of high-resolution mid-infrared spectroscopy. Data were acquired May 28-June 4, 2007 at the McMath-Pierce Solar Telescope (Kitt Peak, Arizona, USA), during a coordinated ground-based observing campaign in support of Venus Express. The Cologne Tuneable Heterodyne Infrare…
An occultation event in the nucleus of the planetary nebula M 2-29
Zijlstra, A. A.; Hajduk, M.; Gesicki, K.
Aims: Eclipses and occultations of post-AGB stars provide a powerful method of exploring the near-stellar environment, including close companions and circumstellar debris disks. Only six eclipsing systems and one dust-occultation system are currently known. New cases are important for our understanding of binary evolution during the AGB mass-loss …
Dust ring formation due to ice sublimation of radially drifting dust particles under the Poynting Robertson effect in debris disks
Kimura, Hiroshi; Kobayashi, Hiroshi; Watanabe, Sei-ichiro +1 more
In a disk with a low optical depth, dust particles drift radially inward by the Poynting-Robertson (P-R) drag rather than are blown out by stellar radiation pressure following destructive collisions. We investigate the radial distribution of icy dust composed of pure ice and refractory materials in dust-debris disks taking into account the P-R dra…
The structure and dynamics of a bright point as seen with Hinode, SoHO and TRACE
Doyle, J. G.; Madjarska, M. S.; Maclean, R. C. +1 more
Context: Solar coronal bright points have been studied for more than three decades, but some fundamental questions about their formation and evolution still remain unanswered.
Aims: Our aim is to determine the plasma properties of a coronal bright point and compare its magnetic topology extrapolated from magnetogram data with its appearance in…