Zobrazeno 1 - 6
of 6
pro vyhledávání: '"Greg Fahlman"'
Autor:
Jarrod R. Hurley, David B. Reitzel, Ivan R. King, Brad M. S. Hansen, J. Brewer, Peter B. Stetson, Aaron Dotter, Jay Anderson, R. Michael Rich, Greg Fahlman, Harvey B. Richer, Jason S. Kalirai, Michael M. Shara
Publikováno v:
The Astrophysical Journal. 671:380-401
We present the results of a deep Hubble Space Telescope (HST) exposure of the nearby globular cluster NGC6397, focussing attention on the cluster's white dwarf cooling sequence. This sequence is shown to extend over 5 magnitudes in depth, with an app
Autor:
James Brewer, Rodrigo A. Ibata, Jasonjot S. Kalirai, Peter B. Stetson, Brad K. Gibson, Brad M. S. Hansen, Harvey B. Richer, Michael M. Shara, S. Davis, Greg Fahlman, R. M. Rich
Publikováno v:
The Astronomical Journal. 127:2771-2792
We present new results from a photometric study of the main-sequence stars in M4 (NGC 6121=C1620-264), the closest globular cluster to the Sun. Multifield, multiepoch observations at approximately 1, 2, and 6 core radii were obtained with WFPC2 on th
Autor:
Doris M. Neumann, Monique Arnaud, Arif Babul, David Woods, Greg Fahlman, Nick Kaiser, G. Squires, Hans Böhringer
Publikováno v:
The Astrophysical Journal. 482:648-658
We report on the detection of dark matter in the cluster of galaxies Abell~2163 using the weak gravitational distortion of background galaxies, and an analysis of the cluster X-ray emission. We find that while the qualitative distributions of the clu
Autor:
James Brewer, Harvey B. Richer, Brad M. S. Hansen, Bradley Kenneth Gibson, Rodrigo A. Ibata, Greg Fahlman, R. Michael Rich, Michael M. Shara, Marco Limongi, Peter B. Stetson
We present the white dwarf sequence of the globular cluster M4, based on a 123 orbit Hubble Space Telescope exposure, with limiting magnitude V = 30, I = 28. The white dwarf luminosity function rises sharply for I >25.5, consistent with the behaviour
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c33e5b5f1411af23e34d083d0d203600
Publikováno v:
The Astrophysical Journal. 459
The Sagittarius dwarf galaxy (SDG) is visible in the background field of the globular cluster M55. We present a deep VI color-magnitude diagram (CMD) of M55, which shows a prominent sequence of stars some 3.5 mag below the cluster main sequence. Thro
Publikováno v:
The Astrophysical Journal. 437:56
We explore the dark matter distribution in ms1224.7+2007 using the gravitational distortion of the images of faint background galaxies. Projected mass image reconstruction reveals a highly significant concentration coincident with the X-ray and optic