Search Publications
Photometric properties of the Local Volume dwarf galaxies
Dolphin, A. E.; Tully, R. Brent; Sharina, M. E. +9 more
We present surface photometry and metallicity measurements for 104 nearby dwarf galaxies imaged with the Advanced Camera for Surveys and Wide Field and Planetary Camera 2 aboard the Hubble Space Telescope. In addition, we carried out photometry for 26 galaxies of the sample and for Sextans B on images of the Sloan Digital Sky Survey. Our sample co…
Detection of a Hot Subdwarf Companion to the Be Star FY Canis Majoris
Gies, Douglas R.; Peters, Geraldine J.; Grundstrom, Erika D. +1 more
The rapid rotation of Be stars may be caused in some cases by past mass and angular momentum accretion in an interacting binary in which the mass donor is currently viewed as a small, hot subdwarf stripped of its outer envelope. Here we report on the spectroscopic detection of such a subdwarf in the Be binary system FY Canis Majoris from the analy…
Phyllosilicate and sulfate-hematite deposits within Miyamoto crater in southern Sinus Meridiani, Mars
Clark, R. N.; Arvidson, R. E.; Morris, R. V. +13 more
Orbital topographic, image, and spectral data show that sulfate- and hematite-bearing plains deposits similar to those explored by the MER rover Opportunity unconformably overlie the northeastern portion of the 160 km in diameter Miyamoto crater. Crater floor materials exhumed to the west of the contact exhibit CRISM and OMEGA NIR spectral signatu…
Unresolved emission and ionized gas in the bulge of M31
Bogdán, Á.; Gilfanov, M.
We study the origin of unresolved X-ray emission from the bulge of M31 based on archival Chandra and XMM-Newton observations. We demonstrate that three different components are present. (i) Broad-band emission from a large number of faint sources - mainly accreting white dwarfs and active binaries, associated with the old stellar population, simil…
Magnetic fields and gas in the cluster-influenced spiral galaxy NGC 4254. II. Structures of magnetic fields
Chyży, K. T.
Aims: The origin of asymmetric radio polarized emission in the Virgo Cluster spiral NGC 4254 is investigated and the influence of cluster environment on the properties of magnetic fields is explored.
Methods: Structures of magnetic fields are analyzed with the concept of “magnetic maps”, presenting distributions of different magnetic field com…
Hard X-ray emission from η Carinae
Walter, R.; Rauw, G.; Leyder, J. -C.
Context: If relativistic particle acceleration takes place in colliding-wind binaries, hard X-rays and γ-rays are expected through inverse Compton emission, but to date these have never been unambiguously detected.
Aims: To detect this emission, observations of
Cluster observations of the Earth's quasi-parallel bow shock
Dandouras, I.; RèMe, H.; Horbury, T. S. +1 more
Cluster observations of the Earth's quasi-parallel shock are used to investigate properties of the transition and the role of magnetic pulsations in the shock process. We use crossings at small spacecraft separations to show that pulsations grow in only a few seconds. We then use an example when the spacecraft were only a few thousand kilometers a…
A new view of quiet-Sun topology from Hinode/SOT
Régnier, S.; Parnell, C. E.; Haynes, A. L.
Context: With the recent launch of the Hinode satellite our view of the nature and evolution of quiet-Sun regions has been improved. In light of the new high resolution observations, we revisit the study of the quiet Sun's topological nature.
Aims: Topology is a tool to explain the complexity of the magnetic field, the occurrence of reconnecti…
High-resolution optical spectroscopy of Plaskett's star
Martins, F.; Gosset, E.; Rauw, G. +3 more
Context: Plaskett's star (
Characteristics of middle- to low-latitude Pi2 excited by bursty bulk flows
Zong, Qiugang; Lucek, E.; Zhang, Tielong +13 more
This paper, by using the data of Cluster, TC-1, GOES, and eight ground stations on 22 October 2004, studied the characteristics of low-latitude Pi2s generated by an earthward bursty bulk flow (BBF) in the near-Earth tail plasma sheet. The BBF excited simultaneously two distinct classes of Pi2s: one is long-period Pi2 (90-130 s) and the other is sh…