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Observations of A4059 with Chandra, Hubble Space Telescope, and the Very Large Array: Unraveling a Complex Cluster/Radio Galaxy Interaction
Perlman, Eric S.; Reynolds, Christopher S.; Heinz, Sebastian +3 more
We present a detailed reanalysis of Chandra data for the galaxy cluster A4059 and its central radio galaxy, PKS 2354-35. We also present new 1.4 and 4.7 GHz CnB-array radio data from the Very Large Array, as well as a short archival WFPC2 image from the Hubble Space Telescope. The presence of a strong interaction between this radio galaxy and the …
The exterior cusp and its boundary with the magnetosheath: Cluster multi-event analysis
Balogh, A.; Dandouras, I.; Lavraud, B. +9 more
Available from http://www.copernicus.org/site/EGU/annales/22/8/3039.htm?FrameEngine=false;
Solar wind stream interaction regions without sector boundaries
Steinberg, J. T.; Goldstein, B. E.; Neugebauer, M. +2 more
During periods of high solar activity when there are many sources of solar wind on the solar disk, a spacecraft occasionally encounters consecutive solar wind streams with the same magnetic polarity. The low-speed wind in the region of interaction between the two streams exhibits many of the same features as, but has some differences from, the low…
The stellar composition of the star formation region CMa R1 - III. A new outburst of the Be star component in Z CMa
van den Ancker, M. E.; Acke, B.; Tjin A Djie, H. R. E. +5 more
We report on a recent event in which, after more than a decade of slow fading, the visual brightness of the massive young binary Z CMa suddenly started to rise by about 1 mag in 1999 December, followed by a rapid decline to its previous brightness over the next six months. This behaviour is similar to that exhibited by this system around its erupt…
The Luminosity Function of Early-Type Field Galaxies at z ~ 0.75
Ford, H. C.; Infante, L.; Zheng, W. +36 more
We measure the luminosity function of morphologically selected E/S0 galaxies from z=0.5 to 1.0 using deep high-resolution Advanced Camera for Surveys (ACS) imaging data. Our analysis covers an area of 48 arcmin2 (8 times the area of the Hubble Deep Field North) and extends 2 mag deeper (I~24 mag) than was possible in the Deep Groth Stri…
Solar EUV irradiance variability derived from terrestrial far ultraviolet dayglow observations
Judge, D. L.; Meier, R. R.; Lean, J. L. +7 more
Remotely sensed ultraviolet emissions from the Earth's upper atmosphere are shown to mirror fluctuations in solar EUV irradiance during July 2002, including the overall increase and decrease as the Sun rotated, and episodic increases associated with multiple solar flares. The TIMED/GUVI dayglow observations are used to derive a new quantity, Q
Characterizing the Stellar Population in NGC 1705-1
Martin, Crystal L.; Heckman, Timothy M.; Meurer, Gerhardt R. +4 more
We observed the brightest super-star cluster NGC 1705-1 in the nearby dwarf galaxy NGC 1705 with the Space Telescope Imaging Spectrograph in the echelle mode between 1200 and 3100 Å. The data allow a study of the young stellar population at hitherto unprecedented spectral resolution and signal-to-noise ratios. A comprehensive list of strong and we…
XMM-Newton spectral and timing observations of the millisecond pulsar PSR J0218+4232
Webb, N. A.; Barret, D.; Olive, J. -F.
We present XMM-Newton MOS imaging and PN timing data of the millisecond pulsar
A Comparison of CME-Associated Atmospheric Waves Observed in Coronal (Fe XII 195 Å) and Chromospheric (He I 10830 Å) Lines
Gilbert, Holly R.; Thompson, Barbara J.; Holzer, Thomas E. +1 more
Although ``Moreton'' waves have historically been observed in Hα data, more recently waves have also been observed in chromospheric He I λ10830 images obtained at the Mauna Loa Solar Observatory. In an effort to better understand the nature of chromospheric waves and their relationship to coronal waves observed in EUV Imaging Telescope (EIT) data,…
Separators in 3D Quiet-Sun Magnetic Fields
Priest, E. R.; Parnell, C. E.; Close, R. M.
At the confluence of four regions of different magnetic connectivity lies a distinct topological candidate for coronal heating, namely the magnetic separator. In this study, a method for tracing separator curves is developed and the statistical properties of separators in coronal fields are subsequently explored by analysing a model field with an …