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127 papers · 2 filters
The Angstrom Project Alert System: real-time detection of extragalactic microlensing
M. J. Darnley, E. Kerins, A. Newsam +9
The Angstrom Project is undertaking an optical survey of stellar microlensing events across the bulge region of the Andromeda Galaxy (M31) using a distributed network of two-meter…
Quasars with Super Metal Rich Emission Line Regions
Neelam Dhanda, Jack A. Baldwin, Misty C. Bentz +1
We study the degree of chemical enrichment in the Broad Emission Line Regions (BELRs) of two QSOs with unusually strong nitrogen emission lines. The N V 1240/ C IV 1549 intensity r…
The 15 - 20 Micron Spitzer Spectra of Interstellar Emission Features in NGC 7023
K. Sellgren, K. I. Uchida, M. W. Werner
We present 15 - 20 micron long-slit spectra, from the Infrared Spectrograph (IRS) on Spitzer, of NGC 7023. We observe recently-discovered interstellar emission features, at 15.9, 1…
Probing ~100 AU Intergalactic MgII Absorbing "Cloudlets" with Quasar Microlensing
Subo Dong
Intergalactic MgII absorbers are known to have structures down to scales ~ 10^{2.5} pc, and there are now indications that they may be fragmented on scales <~ 10^{-2.5} pc (Hao et…
The Fe-Line Feature In The X-Ray Spectrum of Solar Flares: First Results From The SOXS Mission
Rajmal Jain, Anil K. Pradhan, Vishal Joshi +5
We present the first results from the "Low Energy Detector" payload of the "Solar X-ray Spectrometer (SOXS)" mission, which was launched onboard the GSAT-2 Indian spacecraft on 08…
The Sources of the CDF-N : broadband spectral analyses, absorption measurements and the alpha_ox - L_UV relation
S. Frank, Patrick S. Osmer, S. Mathur
We present broadband properties of sources in the Chandra Deep Field-North with spectroscopic redshifts. The high luminosity and redshift bins are dominated by typical quasars. The…