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Gas Infall and Stochastic Star Formation in Galaxies in the Local Universe
Guinevere Kauffmann, Timothy M. Heckman, Gabriella De Lucia +5
We study the recent star formation histories of local galaxies by analyzing the scatter in their colours and spectral properties. We present evidence that the distribution of star…
Chandra and XMM Observations of Type II Quasars from the SDSS
A. Ptak, N. Zakamska, M. Strauss +4
We are carrying out sensitive X-ray observations with Chandra and XMM of type II quasars selected from the Sloan Digital Sky Survey based on their optical emission line properties.…
The Relationship of Hard X-ray and Optical Line Emission in Low Redshift Active Galactic Nuclei
T. M. Heckman, A. Ptak, A. Hornschemeier +1
In this paper we assess the relationship of the population of Active Galactic Nuclei (AGN) selected by hard X-rays to the traditional population of AGN with strong optical emission…
GALEX Observations of an Energetic Ultraviolet Flare on the dM4e Star GJ 3685A
Richard D. Robinson, Jonathan M. Wheatley, Barry Y. Welsh +23
The Galaxy Evolution Explorer (GALEX) satellite has obtained high time resolution ultraviolet photometry during a large flare on the M4 dwarf star GJ 3685A. Simultaneous NUV (1750…
X-ray Emission from NGC 1808: More than a Complex Starburst
E. Jimenez-Bailon, M. Santos-Lleo, M. Dahlem +5
Earlier observations of NGC 1808 in various wavebands (X-ray, optical, near-infrared, radio) provided evidence for the existence of either a starburst or a Seyfert 2 nucleus. We he…
The dynamics and high-energy emission of conductive gas clouds in supernova-driven galactic superwinds
A. Marcolini, D. K. Strickland, A. D'Ercole +2
In this paper we present high-resolution hydrodynamical models of warm ionized clouds embedded in a superwind, and compare the OVI and soft X-ray properties to the existing observa…