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A search for counterparts to massive X-ray binaries using photometric catalogues
Negueruela, I.; Schurch, M. P. E.
Context: The X-ray and γ-ray observatory INTEGRAL has discovered large numbers of new hard X-ray sources, many of which are believed to be high mass X-ray binaries. However, for a significant fraction, their counterparts remain unidentified.
Aims: We explore the use of photometric catalogues to find optical counterparts to high mass X-ray bina…
Hinode EUV Study of Jets in the Sun's South Polar Corona
Harra, Louise K.; Doschek, George A.; Lundquist, Loraine L. +8 more
A number of coronal bright points and associated plasma jet features were seen in an observation of the South polar coronal hole during 2007 January. The 40" wide slot was used at the focus of the Hinode EUV Imaging Spectrometer to provide spectral images for two of these events. Light curves are plotted for a number of emission lines that include…
The Solar Eclipse of 2006 and the Origin of Raylike Features in the White-Light Corona
Koutchmy, S.; Sheeley, N. R., Jr.; Wang, Y. -M. +3 more
Solar eclipse observations have long suggested that the white-light corona is permeated by long fine rays. By comparing photographs of the 2006 March 29 total eclipse with current-free extrapolations of photospheric field measurements and with images from the Solar and Heliospheric Observatory (SOHO), we deduce that the bulk of these linear featur…
The Mass Assembly History of Spheroidal Galaxies: Did Newly Formed Systems Arise via Major Mergers?
Treu, Tommaso; Ellis, Richard S.; Bundy, Kevin
We examine the properties of a morphologically selected sample of 0.4<z<1.0 spheroidal galaxies in the GOODS fields in order to ascertain whether or not their increase in abundance with time arises primarily from major mergers. To address this question, we determine the scaling relations between the dynamical mass Mdyn, determined…
The AU Microscopii Debris Disk: Multiwavelength Imaging and Modeling
Duchêne, Gaspard; Fitzgerald, Michael P.; Graham, James R. +2 more
Debris disks around main-sequence stars are produced by the destruction of unseen parent bodies. AU Microscopii (GJ 803) is a compelling object to study in the context of disk evolution across different spectral types, as it is an M dwarf whose nearly edge-on disk may be directly compared to that of its A5 V sibling β Pic. We resolve the disk from…
Evolution of Dust and Ice Features around FU Orionis Objects
Quanz, S. P.; Henning, Th.; van Boekel, R. +5 more
We present spectra for a sample of 14 FUors and two T Tauri stars observed with Spitzer or ISO. Based on the appearance of the 10 µm silicate feature, we define two categories of FUors. Objects showing the silicate feature in absorption (Category 1) are still embedded in a circumstellar envelope. The shape of the silicate bands is in good ag…
The X-ray soft excess in classical T Tauri stars
Güdel, M.; Telleschi, A.
Aims:We study an anomaly in the X-ray flux (or luminosity) ratio between the O vii λλ21.6-22.1 triplet and the O viii Lyα line seen in classical T Tauri stars (CTTS). This ratio is unusually high when compared with ratios for main-sequence and non-accreting T Tauri stars (Telleschi et al. 2007c, A&A, 468, 443). We compare these samples to iden…
Gravitational lensing by cosmic strings: what we learn from the CSL-1 case
Paolillo, M.; Grogin, N. A.; Schreier, E. J. +5 more
Cosmic strings were postulated by Kibble in 1976 and, from a theoretical point of view, their existence finds support in modern superstring theories, both in compactification models and in theories with extended additional dimensions. Their eventual discovery would lead to significant advances in both cosmology and fundamental physics. One of the …
``Bursty'' Reconnection Following Solar Eruptions: MHD Simulations and Comparison with Observations
Lin, Jun; Riley, Pete; Mikić, Zoran +4 more
Posteruptive arcades are frequently seen in the aftermath of coronal mass ejections (CMEs). The formation of these loops at successively higher altitudes, coupled with the classic ``two-ribbon'' flare seen in Hα, are interpreted as reconnection of the coronal magnetic field that has been dragged outward by the CME. White-light observations of ``ra…
VLA and XMM-Newton Observations of the SNR W41/TeV Gamma-Ray Source HESS J1834-087
Wang, Q. D.; Leahy, D. A.; Li, Z. +1 more
The recently discovered extended TeV source HESS J1834-087 is associated with both a diffuse X-ray enhancement and a molecular cloud, projected at the center of an old radio supernova remnant, G23.3-0.3 (SNR W41). New H I observations from the VLA Galactic Plane Survey (VGPS) show unambiguous structures associated with W41 in the radial velocity r…