The Stis Ccd Cross-dispersion Point Spread Function
نویسنده
چکیده
This report to outlines the work done by the Eta Carinae HST Treasury Project to determine the properties of the cross-dispersion point spread function for the HST Space Telescope Imaging Spectrograph (STIS) CCD. In this document we will refer to the cross-dispersion point spread function by the abbreviation: XSF. The goal of this work is to give a model for the STIS/CCD XSF which can be calculated as a function of wavelength and CCD column number. The intended uses of this model include: calculating STIS CCD slit throughput corrections, re-calibrating the absolute flux scale for the STIS CCD, and deconvolving the observed cross dispersion profiles for extended sources.
منابع مشابه
A new CTE Correction Algorithm for Point Source Spectroscopy with the STIS CCD : Correcting for charge trap filling by the ‘ red halo ’ of the CCD Point Spread Function redward of 8000 Å
The CTE-related loss for spectrophotometry of point sources with the STIS CCD is parametrized in terms of dependencies on the signal level of the source spectrum within the extraction box, the background level, and the signal in the point spread function located between the standard extraction box and the read-out amplifier. Primary constraints on the CTE correction algorithm are provided by es...
متن کاملThe STIS CCD Spectroscopic Line Spread Functions
We characterize the spectroscopic line spread functions of the spectroscopic CCD modes for high contrast objects. Our long range goal is to develop tools that accurately extract spectroscopic information of faint, point or extended sources in the vicinity of bright, point sources at separations approaching the realizable angular limits of HST with STIS. Diffracted and scattered light due to the...
متن کاملAn Algorithm for Correcting CTE Loss in Spectrophotometry of Point Sources with the STIS CCD
The correction for the change in sensitivity with time for the STIS CCD modes is complicated by the gradual loss of charge transfer efficiency (CTE) of the CCD. The amount of this CTE loss depends on time in orbit, the location on the CCD chip with respect to the readout amplifier, the stellar signal strength, and the background level. Primary constraints on our correction algorithm are provide...
متن کاملDefocusing Effect Studies in MTF of CCD Cameras Based on PSF Measuring Technique
Defocusing effects in modulation transfer function (MTF) measurement of charge coupled device (CCD) cameras is the main focus of current paper. We introduce measuring Point-spread function (PSF) in order to calculate the MTF and further more we will study the shape of MTF and its cut-off frequency by adjusting the lens focusing in different locations. A collimated white light LED by broadband s...
متن کاملwx2d: A PyRAF Routine to Resample Spectral Images
Single rows in STIS rectified spectral images are being analyzed in science programs where the highest obtainable spatial resolution is needed. Here we discuss a problem that limits the accuracy of rectified spectral images that contain spatially unresolved components. Because the point spread function is undersampled along the slit, interpolation between the rows of the distorted spectral imag...
متن کامل