Zobrazeno 1 - 10
of 219
pro vyhledávání: '"Davis, D S"'
We have used the field stars from the open cluster survey BOCCE, to study three low-latitude fields imaged with the Canada-France-Hawaii telescope (CFHT), with the aim of better understanding the Galactic structure in those directions. Due to the dee
Externí odkaz:
http://arxiv.org/abs/0803.0674
Autor:
Davis, D. S., Richer, H. B., Anderson, J., Brewer, J. P., Hurley, J., Kalirai, J. S., Rich, R. M., Stetson, P. B.
Using Hubble Space Telescope (HST) observations of the globular cluster NGC6397, we constrain the cluster's binary fraction. The observations consist of two fields: the primary science field, a single ACS pointing centered approximately 5' from the c
Externí odkaz:
http://arxiv.org/abs/0803.0005
Aims: We present a uniform catalog of the images and radial profiles of the temperature, abundance, and brightness for 70 clusters of galaxies observed by XMM-Newton. Methods: We use a new "first principles" approach to the modeling and removal of th
Externí odkaz:
http://arxiv.org/abs/0710.2241
Autor:
Davis, D. S., Richer, H. B., King, I. R., Anderson, J., Coffey, J., Fahlman, G. G., Hurley, J., Kalirai, J. S.
We have examined the radial distribution of white dwarfs over a single HST/ACS field in the nearby globular cluster NGC 6397. In relaxed populations, such as in a globular cluster, stellar velocity dispersion, and hence radial distribution, is direct
Externí odkaz:
http://arxiv.org/abs/0709.4286
The temporal variability of the telluric sodium layer is investigated by analyzing 28 nights of data obtained with the Colorado State University LIDAR experiment. The mean height power spectrum of the sodium layer was found to be well fit by a power
Externí odkaz:
http://arxiv.org/abs/astro-ph/0609307
Publikováno v:
Mon.Not.Roy.Astron.Soc.370:1541-1555,2006
Massive halos of hot plasma exist around some, but not all elliptical galaxies. There is evidence that this is related to the age of the galaxy. In this paper new X-ray observations are presented for three early-type galaxies that show evidence of yo
Externí odkaz:
http://arxiv.org/abs/astro-ph/0605506
Autor:
Flanagan, K. A., Canizares, C. R., Dewey, D., Houck, J. C., Fredericks, A. C., Schattenburg, M. L., Markert, T. H., Davis, D. S.
Publikováno v:
Astrophys.J. 605 (2004) 230-246
Chandra High Energy Transmission Grating Spectrometer observations of the supernova remnant 1E0102.2-7219 in the Small Magellanic Cloud reveal a spectrum dominated by X-ray emission lines from hydrogen-like and helium-like ions of oxygen, neon, magne
Externí odkaz:
http://arxiv.org/abs/astro-ph/0312509
Publikováno v:
Astrophys.J.597:202-209,2003
In our search for ``hidden'' AGN we present results from a Chandra observation of the nearby cluster Abell 2255. Eight cluster galaxies are associated with point-like X-ray emission, and we classify these galaxies based on their X-ray, radio, and opt
Externí odkaz:
http://arxiv.org/abs/astro-ph/0307370
We report the first detection of an OVIII Ly-alpha absorption line associated with an overdense region in the intergalactic medium (IGM) along the sightline towards PKS 2155-304 with the Chandra Low Energy Transmission Grating Spectrometer (LETGS). T
Externí odkaz:
http://arxiv.org/abs/astro-ph/0206264
Autor:
Rose, J. A., Gaba, A. E., Christiansen, W. A., Davis, D. S., Caldwell, N., Hunstead, R. W., Johnston-Hollitt, M.
Multi-fiber spectroscopy has been obtained for 335 galaxies in the field of the double cluster A3128/A3125, using the 2dF multi-fiber positioner on the AAT. A total of 532 objects in the double cluster now have known redshifts. We have also obtained
Externí odkaz:
http://arxiv.org/abs/astro-ph/0112346