Purpose

This document describes the steps required to acquire, reduce, and analyze DEIMOS throughput measurements.

Directory Structure

The following directories occur in $DEIMOS_THRU_DIR, which is currently set to /s/sdata1001/dmoseng/kroot/throughput:

Directory Subdirectories Title Contents
raw/ YYYYmmmDD Raw data directory Contains dated subdirectories with raw DEIMOS throughput images in .gz format
extract/ log
1200G
plots
830G
600ZD
900ZD
Mirror
None
Extracted data directory Includes subdirectories grouped by grating containing extracted DEIMOS throughput data.
calibs/ 1200G/doc
1200G
600ZD/doc
600ZD
830G/doc
830G
900ZD/doc
900ZD
Sensitivity data Contains the sensitivity files needed by X
dat/   Data files Contains various data files used in reduction

Phases

Phase I: Acquire Data

Observations of standard stars are acquired at least once per run using the automated script described in DEIMOS Standard Star Recipes.

Software

Filename Description
/home/deimos/idl/observe_flux_standard.pro IDL GUI interface

Inputs

No inputs

Outputs

Filename Description
$DEIMOS_THRU_DIR/raw/YYYYmmmDD/dYYMM_NNNN.fits Raw spectra of standard star

Phase II: Spectral Extraction

Extraction involved taking the input 2-D image and extracting a 1-D spectrum.

Software

Filename Description
/home/dmoseng/bin/do_deimos_throughput Shell script to launch IDL
/home/dmoseng/idl/dmoseng/throughput/run_do_deimos_throughput.pro IDL driver script to perform reduction of specific images
/home/dmoseng/idl/dmoseng/throughput/do_deimos_throughput.pro IDL script to define input and output filenames.
/home/dmoseng/idl/dmoseng/throughput/deimos_throughput.pro IDL script to extract spectrum

Inputs

Filename Description
$DEIMOS_THRU_DIR/raw/YYYYmmmDD/dYYMM_NNNN.fits Raw spectra of standard star

Outputs

Filename Description
$DEIMOS_THRU_DIR/extract/<grating>/YYYYmmmDD_dNNNN_NNNN.fits FITS binary table with two extensions:
(1) METADATA has keyword/value pairs
(2) SPECTRUM has wavelength and flux
$DEIMOS_THRU_DIR/extract/<grating>/YYYYmmmDD_dNNNN_NNNN.sav IDL SAVE file with the following structures:
(1) meta: metadata
(2) spec: spectrum (wavelength, counts)
(3) diag0: diagnostics for blue chip (trace, profile, spectrum)
(4) diag1: diagnostics for red chip (trace, profile, spectrum)
$DEIMOS_THRU_DIR/extract/<grating>/YYYYmmmDD_dNNNN_NNNN.ps Postscript plot file showing profile, trace and extracted 1-D spectrum for both the red and blue chip, plus combined spectrum
$DEIMOS_THRU_DIR/extract/<grating>/YYYYmmmDD_dNNNN_NNNN_M_trace.region trace listing for chip M
$DEIMOS_THRU_DIR/extract/log/do_deimos_throughput.YYYY-MMM-DD-HH:MM:SS.log logfile from execution of this routine

Procedure

Phase III: Reviewing

All spectra should be reviewed before being extracted in order to ensure that they are "good". Follow these steps to review spectra:

Build throughput image list

Generate stats on reductions

Phase IV: Conversion

Follow these steps to convert 1-d spectrum to absolute flux using X's reduction algorithm. See his original doco in ~kics/DEIMOS/README.

Phase V: Documentation Phase

Data Products

Extraction phase

All files live in the directory /s/sdata1001/dmoseng/throughput/extract and subdirectories.

FITS binary tables

Postscript file

Calibration phase

All files live in the directory /s/sdata1001/dmoseng/throughput/calibs and subdirectories.

FITS binary table

Data files and Plots

Action Items

Extraction phase

Calibration phase