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The Nature of Blue Cores in Spheroids: a Possible Connection with AGN and Star Formation
Felipe Menanteau, Andre R. Martel, Paolo Tozzi +9
We investigate the physical nature of blue cores in early-type galaxies through the first multi-wavelength analysis of a serendipitously discovered field blue-nucleated spheroid in…
Strong Lensing Analysis of A1689 from Deep Advanced Camera Images
Tom Broadhurst, Narciso Benitez, Dan Coe +6
We analyse deep multi-colour Advanced Camera images of the largest known gravitational lens, A1689. Radial and tangential arcs delineate the critical curves in unprecedented detail…
Spectroscopic Observations and Analysis of the Peculiar SN 1999aa
G. Garavini, G. Folatelli, A. Goobar +55
We present an extensive new time-series of spectroscopic data of the peculiar SN 1999aa in NGC 2595. Our data set includes 25 optical spectra between -11 and +58 days with respect…
A Search for H-alpha Absorption in the Exosphere of the Transiting Extrasolar Planet HD 209458b
Joshua N. Winn, Yasushi Suto, Edwin L. Turner +5
There is evidence that the transiting planet HD 209458b has a large exosphere of neutral hydrogen, based on a 15% decrement in Lyman-alpha flux that was observed by Vidal-Madjar et…
A Lyman-alpha-only AGN from the Sloan Digital Sky Survey
Patrick B. Hall, Erik A. Hoversten, Christy A. Tremonti +7
The Sloan Digital Sky Survey has discovered a z=2.4917 radio-loud active galactic nucleus (AGN) with a luminous, variable, low-polarization UV continuum, H I two-photon emission, a…