Search Publications
Shrinking and Cooling of Flare Loops in a Two-Ribbon Flare
Lin, Jun; Temmer, Manuela; Veronig, Astrid +2 more
We analyze the evolution of the flare/postflare-loop system in the two-ribbon flare of November 3, 2003, utilizing multi-wavelength observations that cover the temperature range from several tens of MK down to 104 K. A non-uniform growth of the loop system enables us to identify analogous patterns in the height-time, h(t), curves measur…
Striated auroral kilometric radiation emission: A remote tracer of ion solitary structures
Gurnett, D. A.; Menietti, J. D.; Mutel, R. L. +2 more
We describe the statistical properties of narrowband drifting auroral kilometric radiation ("striated" AKR) based on observations from the Cluster wideband receiver during 2002-2005. We show that the observed characteristics, including frequency drift rate and direction, narrow bandwidth, observed intensity, and beaming angular sizes are all consi…
Electrostatic solitary structures observed at Saturn
Gurnett, D. A.; Dougherty, M. K.; Kurth, W. S. +2 more
We report observations of electric field solitary structures, measured by the Cassini Radio and Plasma Wave Science (RPWS) instrument in the vicinity of Saturn's magnetosphere with ambient magnetic fields that range from ~0.1 nT to 8000 nT. The peak-to-peak electric field amplitudes of the observed solitary structures range from a few µV/m t…
A historic jet-emission minimum reveals hidden spectral features in 3C 273
Lähteenmäki, A.; Foellmi, C.; O'Brien, P. T. +14 more
Aims. The aim of this work is to identify and study spectral features in the quasar 3C 273 usually blended by its strong jet emission.
Methods: . A historic minimum in the sub-millimetre emission of 3C 273 triggered coordinated multi-wavelength observations in June 2004. X-ray observations from the INTEGRAL, XMM-Newton and RXTE satellites are…
Deep HST Photometry of NGC 6388: Age and Horizontal-Branch Luminosity
Kinemuchi, Karen; Rich, R. M.; Catelan, M. +5 more
Using the Hubble Space Telescope, we have obtained the first color-magnitude diagram (CMD) to reach the main-sequence turnoff of the Galactic globular cluster NGC 6388. From a comparison between the cluster CMD and that of 47 Tucanae, we find that the bulk of the stars in these two clusters have nearly the same age and chemical composition. On the…
The star formation rate at redshift one: Hα spectroscopy with CIRPASS
Bunker, Andrew; Sharp, Robert; Dalton, Gavin +3 more
We have conducted an Hα survey of 38 0.77 <= z <= 1 galaxies over ~100arcmin2 of the Hubble Deep Field-North and Flanking Fields, to determine star formation rates (SFRs), with the near-IR multi-object spectrograph Cambridge Infrared Panoramic Survey Spectrograph (CIRPASS) on the William Herschel Telescope (WHT). This represents t…
New southern blue compact dwarf galaxies in the 2dF Galaxy redshift survey
Thuan, T. X.; Izotov, Y. I.; Papaderos, P. +3 more
Aims.Aiming to find new extremely metal-deficient star-forming galaxies we extracted from the Two-Degree Field Galaxy Redshift Survey (2dFGRS) 100 K Data Release 14 emission-line galaxies with relatively strong [O iii] λ4363 emission.
Methods: .Spectroscopic and photometric studies of this sample and, in addition, of 7 Tololo and 2 UM galaxies…
Spectral Irradiance Calibration in the Infrared. XVI. Improved Accuracy in the Infrared Spectra of the Secondary and Tertiary Standard Calibration Stars
Kraemer, Kathleen E.; Price, Stephan D.; Engelke, Charles W.
We have increased the spectral resolution and accuracy of the absolute infrared spectral flux for a subset of stellar standards created by Cohen and his collaborators in previous papers in this series. We combined the moderate-resolution (λ/Δλ~400) spectroscopy obtained on infrared standard stars by the Short Wavelength Spectrometer on the Infrare…
Strange magnification pattern in the large separation lens SDSS J1004+4112 from optical to X-rays
Christensen, L.; Schwope, A.; Wisotzki, L. +1 more
We present simultaneous XMM-Newton UV and X-ray observations of the quadruply lensed quasar
Simple Magnetic Flux Balance as an Indicator of Ne VIII Doppler Velocity Partitioning in an Equatorial Coronal Hole
McIntosh, Scott W.; Davey, Alisdair R.; Hassler, Donald M.
We present a novel investigation into the relationship between simple estimates of magnetic flux balance and the Ne VIII Doppler velocity partitioning of a large equatorial coronal hole observed by the Solar Ultraviolet Measurements of Emitted Radiation spectrometer (SUMER) on the Solar and Heliospheric Observatory in 1999 November. We demonstrate…