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A New Distortion Solution for NIRC2 on the Keck II Telescope
Ghez, A. M.; Anderson, J.; Lu, J. R. +3 more
We present a new geometric distortion model for the narrow-field mode of the near-infrared camera (NIRC2) fed by the adaptive optics system on the W. M. Keck II telescope. The adaptive optics system and NIRC2 camera were realigned on 2015 April 13. Observations of the crowded globular cluster, M53, were obtained before and after the realignment to…
Decontaminating Swift UVOT Grism Observations of Transient Sources
Suntzeff, Nicholas B.; Kuin, Paul; Brown, Peter J. +1 more
We present a new technique of decontaminating Swift Ultraviolet/Optical Telescope grism spectra for transient objects. We describe the template image requirements and image processing steps necessary to successfully implement the empirical decontamination technique. We demonstrate the accuracy of the flux and wavelength calibrations for decontamin…
New Gapless COS G140L Mode Proposed for Background-limited Far-UV Observations
Anderson, Scott F.; France, Kevin; Fleming, Brian +6 more
Here we describe the observation and calibration procedure for a new G140L observing mode for the Cosmic Origins Spectrograph (COS) on board the Hubble Space Telescope (HST). This mode, CENWAV = 800, is designed to move the far-UV band fully onto the Segment A detector, allowing for more efficient observation and analysis by simplifying calibratio…