573 citations
- Johns Hopkins UniversityUS21 papers
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9 papers · 1 filter
Biases and Uncertainties in Physical Parameter Estimates of Lyman Break Galaxies from Broad-band Photometry
Seong-Kook Lee, Rafal Idzi, Henry C. Ferguson +3
We investigate the biases and uncertainties in estimates of physical parameters of high-redshift Lyman break galaxies (LBGs), such as stellar mass, mean stellar population age, and…
A High Yield of New Sightlines for the Study of Intergalactic Helium: Far-UV-Bright Quasars from SDSS, GALEX, and HST
David Syphers, Scott F. Anderson, Wei Zheng +6
Investigations of He II Ly-alpha (304 A rest) absorption toward a half-dozen quasars at z~3-4 have demonstrated the great potential of helium studies of the IGM, but the current cr…
The Milky Way Tomography with SDSS: II. Stellar Metallicity
Zeljko Ivezic, Branimir Sesar, Mario Juric +50
Using effective temperature and metallicity derived from SDSS spectra for ~60,000 F and G type main sequence stars (0.2<g-r<0.6), we develop polynomial models for estimating these…
UV and FUV spectroscopy of the hybrid PG 1159-type central star NGC 7094
M. Ziegler, T. Rauch, E. Reiff +3
Previous studies aiming at the iron-abundance determination in three PG 1159 stars (K 1-16, PG 1159-035, NGC 7094) and a [WC]-PG 1159 transition star (Abell 78) have revealed that…
Spectral Analysis of Central Stars of Planetary Nebulae
Thomas Rauch, Klaus Werner, Marc Ziegler +2
Spectral analysis by means of NLTE model atmospheres has presently arrived at a high level of sophistication. High-resolution spectra of central stars of planetary nebulae can be r…
A new superwind galaxy: XMM-Newton observations of NGC 6810
David K. Strickland
We present the first imaging X-ray observation of the highly inclined (i = 78 deg) Sab Seyfert 2 galaxy NGC 6810 using XMM-Newton, which reveals soft X-ray emission that extends ou…