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Radio, optical and infrared observations of CLASS B0128+437
McKean, J. P.; Biggs, A. D.; Browne, I. W. A. +4 more
We present new observations of the gravitational lens system CLASS B0128+437 made in the optical, infrared and radio regimes. Hubble Space Telescope observations detect only a very faint, extended object in the I band with no obvious emission from the lensed images visible; no detection at all is made in the V band. The lens system is detected wit…
Similarities and Differences between Coronal Holes and the Quiet Sun: Are Loop Statistics the Key?
Solanki, S. K.; Wiegelmann, T.
Coronal holes (CH) emit significantly less at coronal temperatures than quiet-Sun regions (QS), but can hardly be distinguished in most chromospheric and lower transition region lines. A key quantity for the understanding of this phenomenon is the magnetic field. We use data from SOHO/MDI to reconstruct the magnetic field in coronal holes and the …
Evidence of Rapid Flux Emergence Associated with the M8.7 Flare on 2002 July 26
Qiu, Jiong; Jing, Ju; Wang, Haimin +5 more
In this paper, we present a detailed study of the M8.7 flare that occurred on 2002 July 26 using data from the Big Bear Solar Observatory (BBSO), Ramaty High Energy Solar Spectroscopic Imager (RHESSI), the Transition Region and Coronal Explorer (TRACE), and the Solar and Heliospheric Observatory (SOHO). This flare has interesting properties simila…
Two-dimensional spectroscopy of a sunspot. I. Properties of the penumbral fine structure
Bellot Rubio, L. R.; Schlichenmaier, R.; Tritschler, A. +3 more
We investigate the properties of the fine structure of a sunspot penumbra based on spectroscopic measurements with high spectral (λ/δλ=250 000) and high spatial (≈0.5 arcsec) resolution. The magnetically insensitive Fe I 557.6 nm line is used to probe the penumbral atmosphere. The data was taken at the German Vacuum Tower Telescope with the 2D-spe…
Far Infrared mapping of NGC 891
Tuffs, R. J.; Kylafis, N. D.; Madore, B. F. +1 more
We present deep maps of dust emission from the edge-on spiral galaxy NGC 891, obtained with the ISOPHOT instrument on board the Infrared Space Observatory in broad band filters with reference wavelengths centered on 170 and 200 µm. Using new processing methods to remove the effects of detector transients from the data, we detect cold dust at…
The Purple Haze of η Carinae: Binary-induced Variability?
Smith, Nathan; Gull, Theodore R.; Collins, Nicholas R. +1 more
Asymmetric variability in ultraviolet images of the Homunculus obtained with the Advanced Camera for Surveys/High Resolution Camera on the Hubble Space Telescope suggests that η Carinae is indeed a binary system. Images obtained before, during, and after the recent ``spectroscopic event'' in 2003.5 show alternating patterns of bright spots and sha…
Jet-Gas Interactions in Markarian 78. I. Morphology and Kinematics
Wilson, Andrew S.; Whittle, Mark
We present a detailed study of the Seyfert 2 galaxy Markarian 78, using continuum and emission-line images and multiaperture spectra from the Hubble Space Telescope (HST) and a deep 3.6 cm VLA image. Our overall aim is to study the interaction between the radio source and the emission-line gas, since ground-based data already indicate the presence…
Cassini Radio Science
French, R. G.; Flasar, F. M.; Asmar, S. W. +10 more
Cassini radio science investigations will be conducted both during the cruise (gravitational wave and conjunction experiments) and the Saturnian tour of the mission (atmospheric and ionospheric occultations, ring occultations, determinations of masses and gravity fields). New technologies in the construction of the instrument, which consists of a …
XMM-Newton Observations of the Galactic Supernova Remnant CTB 109 (G109.1-1.0)
Sasaki, Manami; Smith, Randall K.; Plucinsky, Paul P. +3 more
We present the analysis of the X-ray Multimirror Mission (XMM-Newton) European Photon Imaging Camera (EPIC) data of the Galactic supernova remnant (SNR) CTB 109 (G109.1-1.0). CTB 109 is associated with the anomalous X-ray pulsar (AXP) 1E 2259+586 and has an unusual semicircular morphology in both the X-ray and the radio and an extended X-ray brigh…
Absolute Proper Motion of the Fornax Dwarf Spheroidal Galaxy from Photographic and Hubble Space Telescope WFPC2 Data
Majewski, Steven R.; Keeney, Brian A.; Girard, Terrence M. +1 more
We have measured the absolute proper motion of the Fornax dwarf spheroidal galaxy from a combination of photographic plate material and Hubble Space Telescope Wide Field Planetary Camera 2 data that provide a time baseline of up to 50 yr. The extragalactic reference frame consists of eight QSO images and 48 galaxies. The absolute proper motion is …