WiFeS IRAF DATA R P - Intranet - ANU...dodar dosubsky doslitsky overscan or ﬁtbias doskyframe...

WiFeS workshop, RSAA 28 April 2010

WiFeS IRAF DATA

REDUCTION PACKAGE

Turn raw files into calibrated 3D images

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yx

( http://rsaa.anu.edu.au/observing/ssowiki/index.php/WiFeS_data_reduction )

Link to scripts here:RSAA home page ! WiFeS in menu ! ‘Data Reduction’ at bottom of wiki page

WiFeS package

Gemini package (NIFS)

IRAF/NOAO spectroscopy tasks

Requires IRAF (version 2.14)

+ external packages: Gemini, TABLES & STSDAS

An external IRAF package based on Gemini for NIFS

Reformat files

Process calibration data

The package is set up for this general process:

wftable

Create image lists

wfcal

wftable

wfreduceApply calibrations &

construct data cubes

file lists

calibration solutions

Set I/O directorieswifes

Smooth-spectrum standard

Flux standard

Science data

Raw files - simple FITS format

Multi-extension FITS files

Convert to multi-extension FITS

T2m3wr_20090405_124930[0][0]

T2m3wr_20090405_124930[1][4138,4096]image data + header

primary header unit⤺⤺

T2m3wr.20090405.134344.123[0][4138,4096]

image data + header⤺

wftable: Convert images to MEF & create file lists

Create image lists for grating+dichroic

wftable

wftable

Images assigned to text list files by the IMAGETYP header keyword value

IMAGETYP FileARC list_arc

FLAT list_gflat

SKYFLAT list_sflat

WIRE list_wire

ZERO list_zero

OBJECT list_obj

wfcal

wfreduce

}list files

Prepare images

wavelength solution

spatialsolution

master flat field frame

median bias

File listsCalibration files

Combine bias frames

Normalise flat field Identify & fit arc lines Find slice centres

Fit & correct slit profile

Measure image shift

wfreduce

dorefflat

dowfprepare

dozero

doarc dowiredogflat

dosflat

wfcal: Steps for processing calibration files

reference frame

Expand binned data

Overscan bias subtraction

Bias frame surface fitting

`Prepare’

wfreduce: Apply wfcal results & construct cubes

Bias subtractionCombine frames

Sky subtraction

Rescale & form data cube

DAR correction

`Reduce’

dowfprepare

docombine

doreduce

dofitcoorddotransform

dodar

dosubskydoslitsky

overscan or fitbias

doskyframe

dozero

Combine shuffled slices

dosubshuffled

data cube

Subtract median bias frame (from wfcal)

`Prepare’



Sky subtraction


DAR correction

`Reduce’

dowfprepare

docombine

doreduce


dodar

dosubskydoslitsky

overscan or fitbias

doskyframe

dozero

Median-combine multiple frames


dosubshuffled

data cube

`Prepare’



Sky subtraction


DAR correction

`Reduce’

dowfprepare

docombine

doreduce


dodar

dosubskydoslitsky

overscan or fitbias

doskyframe

dozero


dosubshuffled

data cube

Subtract a separate blank sky frame

Subtract a sub-aperture average sky spectrum

Subtract `long-slit’ spectrum in each slice

`Prepare’



Sky subtraction


DAR correction

`Reduce’

dowfprepare

docombine

doreduce


dodar

dosubskydoslitsky

overscan or fitbias

doskyframe

dozero


dosubshuffled Shift and combine nod- or subnod-and-shuffled data

data cube

`Prepare’



Sky subtraction


DAR correction

`Reduce’

dowfprepare

docombine

doreduce


dodar

dosubskydoslitsky

overscan or fitbias

doskyframe

dozero


dosubshuffled

Extract 25 slices

Apply flat field

data cube

`Prepare’



Sky subtraction


DAR correction

`Reduce’

dowfprepare

docombine

doreduce


dodar

dosubskydoslitsky

overscan or fitbias

doskyframe

dozero


dosubshuffled

Transform image scales

Stack slices into 3D image

data cube

`Prepare’



Sky subtraction


DAR correction

`Reduce’

dowfprepare

docombine

doreduce


dodar

dosubskydoslitsky

overscan or fitbias

doskyframe

dozero


dosubshuffled

data cube

Process smooth-spectrum standard

star (red)

Process flux standard star

Process science frames & apply standard star

calibrations

telluric spectrum

flux calibration

Extract telluric star spectrum

dotelextract

dofixtel

dofluxextract

(dotelcorrect)

dofluxcal

wfreduce: Further steps for standard star data

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y

(dotelcorrect)

dotelextract


star (red)



calibrations

telluric spectrum

flux calibration

Extract telluric star spectrum

dotelextract

dofixtel

dofluxextract

(dotelcorrect)

dofluxcal


(dotelcorrect)

dotelextract


star (red)



calibrations

telluric spectrum

flux calibration

dotelextract

dofixtel

dofluxextract

(dotelcorrect)

dofluxcal


(dotelcorrect)

Na D

Hα

Ca II

Remove stellar absorption

dofixtel


star (red)



calibrations

telluric spectrum

flux calibration

dotelextract

dofixtel

dofluxextract

(dotelcorrect)

dofluxcal


(dotelcorrect)


dofixtel


star (red)



calibrations

telluric spectrum

flux calibration

dotelextract

dofixtel

dofluxextract

(dotelcorrect)

dofluxcal


(dotelcorrect)


Na D

Hα

Ca II

dofixtel


star (red)



calibrations

telluric spectrum

flux calibration

dotelextract

dofixtel

dofluxextract

(dotelcorrect)

dofluxcal


(dotelcorrect)

Normalise telluric spectrum

Extract and normalise example object spectrum

dotelcorrect


star (red)



calibrations

telluric spectrum

flux calibration

dotelextract

dofixtel

dofluxextract

(dotelcorrect)

dofluxcal

Correct telluric features


(dotelcorrect)dotelcorrect


star (red)



calibrations

telluric spectrum

flux calibration

dotelextract

dofixtel

dofluxextract

(dotelcorrect)

dofluxcal


(dotelcorrect)Extract flux spectrum

dofluxextract


star (red)



calibrations

telluric spectrum

flux calibration

dotelextract

dofixtel

dofluxextract

(dotelcorrect)

dofluxcal


(dotelcorrect)


star (red)



calibrations

telluric spectrum

flux calibration

dotelextract

dofixtel

dofluxextract

(dotelcorrect)

dofluxcal


(dotelcorrect)Calculate flux

scale

dofluxcal

wfreduce: a few last tasks...

doscience

dobincube

dosimcube

output datacube T2m3wr_20090405_124930_R3000_RT560_res_t.fits

..._res_bin.fits

..._res_tds9.fits

..._sci.fits

..._res_c.fits

Form projected image andintegrated spectrum

Re-bin cube spatial axes

Save simple FITS cube file

WiFeS IRAF DATA R P - Intranet - ANU...dodar dosubsky doslitsky overscan or ﬁtbias doskyframe...

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