The individual data frames that emerge, calibrated, from the Spitzer pipeline are Level 1 Data, or Basic Calibrated Data, or BCDs. Table 6.6 is a list of the BCD files delivered by the Spitzer Heritage Archive for a spectrosopic AOR. Figure 6.1 is a cartoon illustrating the relationship between these files.
Table 6.6 BCD Files Delivered.
Name
Description
Format (a)
Channels (b)
Type (c)
Size (kb)
bcd.fits
A BCD is either (1) a 2-D echellogram for the high-resolution data (modules S1 and S3); (2) a long-slit 2-D spectrum for the low-resolution data (modules S0 and S2); or (3) an image for the peak-up modes (module S0).
128 × 128
32-bit real
0,1,2,3
P
< 87
bcdb.fits
If SL spectra were obtained, the peak-up module was also exposing on an adjacent part of the sky. bcdb.fits is the cropped, calibrated blue peak-up image.
41x56
32-bit real
0
P
31
bcdr.fits
If SL spectra were obtained, the peak-up imaging arrays were also exposing on an adjacent part of the sky. bcdr.fits is the cropped, calibrated red peak-up image.
41x56
32-bit real
0
P
31
bmask.fits
Mask file for bcd.fits.
128 × 128
16-bit int
0,1,2,3
P
37
dmask.fits
Mask file for lnz.fits.
128 × 128× N
16-bit int
0,1,2,3
A
<520
drk.fits
Flux image computed in the DARKBASE step (section 5.1.9), just before dark subtraction. If the target is a blank field, these files can be used as to create a dark.
128 × 128× N
32-bit real
0,1,2,3
A
<300
drku.fits
Uncertainty file for drk.fits.
128 × 128× N
32-bit real
0,1,2,3
A
<300
droop.fits
2D data with “droop” correction: a constant number is subtracted from all the pixels. See tablenote (a).
128 × 128
32-bit real
0,1,2,3
A
98
drunc.fits
Uncertainty file for droop.fits.
128 × 128
32-bit real
0,1,2,3
A
67
f2ap.fits
Alternate BCD data without stray light removal or cross-talk correction.
128 × 128
32-bit real
0,1,2,3
A
98
f2unc.fits
Uncertainty file for f2ap.fits.
128 × 128
32-bit real
0,1,2,3
A
67
full.fits
Red and blue peak-up acquisition image.
128 × 128
32-bit real
0
P
100
func.fits
Uncertainty file for bcd.fits.
128 × 128
32-bit real
0,1,2,3
P
67
lnz.fits
3D data cube with linearized ramps, in units of electrons.
128 × 128 × N
32-bit real
0,1,2,3
A
< 1000
lnzu.fits
Uncertainty file for lnz.fits.
128 × 128 × N
32-bit real
0,1,2,3
A
< 1000
mskb.fits
BMASK for bcdb.fits.
41x56
16-bit int
0
P
8.4
mskr.fits
BMASK for bcdr.fits.
41x56
16-bit int
0
P
8.4
out.pline
Output log.
ASCII
0,1,2,3
A
<27
out0.pline
Log file for creation of full.fits and initial cutouts of bcdb.fits and bcdr.fits.
ASCII
0
A
100
outb.pline
Log file for final header updates of bcdb.fits.
ASCII
0
A
30
outr.pline
Log file for final header updates of bcdr.fits.
ASCII
0
A
30
ridge.tbl
Extraction position table from bcd.fits.
ASCII
0,1,2,3
A
< 57
rsc.fits
Data stray light and cross-talk corrected.
128 × 128
32-bit real
0,1,2,3
A
98
rscu.fits
Uncertainty file for rsc.fits.
128 × 128
32-bit real
0,1,2,3
A
67
spec2.tbl
Spectrum extracted from f2ap.fits.
ASCII
0,1,2,3
A
< 132
spect.fits
Spectrum extracted from bcd.fits. Contains the same data as spect.tbl, in a different format.
32-bit real
0,1,2,3
A
25
spect.tbl
Spectrum extracted from bcd.fits. Contains the same data as spect.fits, in a different format.
ASCII
0,1,2,3
P
< 132
uncb.fits
Uncertainty file for bcdb.fits.
51x56
32-bit real
0
P
48
uncr.fits
Uncertainty file for bcdr.fits.
51x56
32-bit real
0
P
48
xout.pline
Log files output from the extraction pipeline processing.
