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Hubble Space Telescope Advanced Camera for Surveys Imaging of ω Centauri: Optical Counterpart for the Quiescent Low-Mass X-Ray Binary
Anderson, Jay; Heinke, Craig O.; Bailyn, Charles D. +5 more
We report the discovery of an optical counterpart to a quiescent neutron star in the globular cluster ω Centauri (NGC 5139). The star was found as part of our wide-field imaging study of ω Cen using the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope. Its magnitude and color (R625=25.2, B435-R625=1.…
The Visible and Near-Infrared Dust Opacity Law in the HH 30 Circumstellar Disk
Stapelfeldt, Karl R.; Watson, Alan M.
We present new images of the scattered-light disk around HH 30 at 0.44 and 0.81 µm. We model these images and an existing 2.04 µm image by using a multiple-scattering code, varying and fitting for the disk parameters and the dust opacity ratios at these wavelengths. A wide range of different disk geometries provide adequate fits to the…
Inner Polar Rings in Regular Lenticular Galaxies
Sil'chenko, O. K.; Afanasiev, V. L.
We have investigated a sample of S0 galaxies, mostly with circumnuclear dust lanes orthogonal to their major axes, chosen from Hubble Space Telescope Wide Field Planetary Camera 2 images. Two-dimensional spectroscopy undertaken with the Multipupil Fiber Spectrograph of the 6 m telescope of the Special Astrophysical Observatory of the Russian Acade…
Circumstellar interaction of the type Ia supernova 2002ic
Lundqvist, P.; Chevalier, R. A.; Chugai, N. N.
We propose a model to account for the bolometric light curve, the quasi-continuum and the CaII emission features of the peculiar type Ia supernova (SN) 2002ic, which exploded in a dense circumstellar envelope. The model suggests that the SN Ia had the maximum possible kinetic energy and that the ejecta expand in an approximately spherically symmet…
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