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- University of Maryland, College ParkUS248 papers
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4 papers · 1 filter
Image-Processing Techniques for the Creation of Presentation-Quality Astronomical Images
T. A. Rector, Z. G. Levay, L. M. Frattare +2
The quality of modern astronomical data, the power of modern computers and the agility of current image-processing software enable the creation of high-quality images in a purely d…
BL Lac evolution revisited
Anna Wolter, Francesca Cavallotti, John T. Stocke +1
BL Lac objects are an elusive and rare class of active galactic nuclei. For years their evolutionary behavior has appeared inconsistent with the trend observed in the population of…
BL Lac X-ray Spectra: simpler than we thought
Eric S. Perlman, Timothy Daugherty, Anuradha Koratkar +10
We report results from {\it XMM-Newton} observations of thirteen X-ray bright BL Lacertae objects, selected from the {\it Einstein} Slew Survey sample. The spectra are generally we…
XMM-Newton observations of the BL Lac MS0205.7+3509: a dense, low-metallicity absorber
D. Watson, B. McBreen, L. Hanlon +5
The high-frequency-peaked BL Lac, MS0205.7+3509 was observed twice with XMM-Newton. Both X-ray spectra are synchrotron-dominated, with mean 0.2--10keV fluxes of 2.80+/-0.01 and 3.3…