The FITS copies of the images in this Atlas are publicly available individually through the NED image server at /forms/images.html and as a collection through a dedicated web page at /level5/Sept02/Palco_BCD/. The FITS headers of these images include, in a homogeneous and self-explanatory way, all the information regarding the image WCS solution and flux calibration along with the date of observation, telescope, filter, exposure time, etc (see the detailed description of the FITS headers of the continuum and H images; see also Table 3). A CDROM with the complete set of FITS images may also be requested from the first author.
BR-bands FITS image headers description | ||||
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BASIC
KEYWORDS |
SIMPLE | T of F | logical | Fits standard? |
BITPIX | 8, 16, 32, -32 | integer | Bits per pixel | |
NAXIS | 2 | integer | Number of axes | |
NAXIS[1-2] | from 1 to 2048 | integer | Axes length | |
EXTEND | F | logical | Does the file contain extensions? | |
OBJECT | galaxy/band/texp/frames | string | Object name + band + total exposure time | |
REDUCTION
KEYWORDS |
OVERSCAN | [2050:2072,1:2048] (PO) or
[2049:2064,1:2048] (LCO) |
string | Overscan region used |
TRIM | [1:2048,1:2048] | string | Image section trimmed | |
CCDSEC | [1:2048,1:2048] | string | Image section used | |
ZEROCOR | string | Comments regarding bias substraction | ||
FLATCOR | string | Comments regarding flat-fielding | ||
CCDPROC | string | CCPROC comments | ||
WCS
KEYWORDS |
CRPIX[1,2] | from 1 to 2048 | real | Reference pixel position |
CRVAL[1,2] | from 1 to 2048 | real | RA & DEC (in degrees) of the reference pixel | |
CTYPE[1,2] | RA---TAN / DEC--TAN | string | WCS projection | |
WCSDIM | 2 | integer | WCS dimension | |
CD[1,2]_[1,2] | from 0 to 2E-4 | real | WCS rotation matrix | |
EQUINOX | 2000. | real | Equinox of the coordinates | |
RADECSYS | FK5 | string | Coordinates system | |
WAT[0,1,2]_001 | wtype=tan | string | ||
IMAGE
COOR. SYS.
KEYWORDS |
LTV[1,2] | from 1 to 2048 | real | Image coordinate system reference pixel |
LTM[1,2]_1 | 1 or -1 | real | Image coordinate system scale | |
ATLAS
SPECIFIC
KEYWORDS |
C_OBDT | month/day/year | string | Date(s) of observation of the image |
C_CLDT | month/day/year | string | Date of observation of the calibrating image | |
C_M0 | from 20 to 40 | real | Zero point of the calibration | |
C_SKY | from -100 to 15000 | real | Sky value (in counts) | |
C_SSKY | from 0 to 100 | real | Std. dev. of the sky (in counts) | |
C_ESKY | from 0 to 10 | real | Std. dev. of the mean of the sky (in counts) | |
C_K | from 0.1 to 0.3 | real | Extinction coefficient (mag/am) | |
C_AM | from 1 to 3 | real | Mean Airmass | |
C_TEXP | from 180 to 2100 | real | Exposure time | |
C_NCB | from 1 to 5 | integer | Number of frames combined | |
C_CC | from -0.08 to 0.08 | real | B-R color coefficient of the calibration | |
C_BRI | 0.8 | real | Initial B-R color | |
C_M0I | from 20 to 40 | real | C_M0 + 2.5 * log10(C_TEXP) - C_K * C_AM + C_CC * C_BRI | |
C_STD | from 0.00 to 0.30 | real | Final error of the calibration | |
C_FLT | obs/filter | string | Observatory/Telescope + Filter:
LC_ -> LCO 100-inch PO_ -> PO 60-inch |
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C_M0F | from 20 to 40 | real | C_M0 + 2.5 * log10(C_TEXP) - C_K * C_AM + C_CC * (final B-R) | |
C_PSF | from 0.6 to 4.3 | real | PSF (FWHM in arcsec) | |
BASIC KEYWORDS | END | End of header |
H FITS image headers description | ||||
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BASIC
KEYWORDS |
SIMPLE | T of F | logical | Fits standard? |
BITPIX | 8, 16, 32, -32 | integer | Bits per pixel | |
NAXIS | 2 | integer | Number of axes | |
NAXIS[1-2] | from 1 to 2048 | integer | Axes length | |
EXTEND | F | logical | Does the file contain extensions? | |
OBJECT | galaxy/band/texp/frames | string | Object name + band + total exposure time | |
REDUCTION
KEYWORDS |
OVERSCAN | [2050:2072,1:2048] (PO) or
[2049:2064,1:2048] (LCO) |
string | Overscan region used |
TRIM | [1:2048,1:2048] | string | Image section trimmed | |
CCDSEC | [1:2048,1:2048] | string | Image section used | |
ZEROCOR | string | Comments regarding bias substraction | ||
FLATCOR | string | Comments regarding flat-fielding | ||
CCDPROC | string | CCPROC comments | ||
WCS
KEYWORDS |
CRPIX[1,2] | from 1 to 2048 | real | Reference pixel position |
CRVAL[1,2] | from 1 to 2048 | real | RA & DEC (in degrees) of the reference pixel | |
CTYPE[1,2] | RA---TAN / DEC--TAN | string | WCS projection | |
WCSDIM | 2 | integer | WCS dimension | |
CD[1,2]_[1,2] | from 0 to 2E-4 | real | WCS rotation matrix | |
EQUINOX | 2000. | real | Equinox of the coordinates | |
RADECSYS | FK5 | string | Coordinates system | |
WAT[0,1,2]_001 | wtype=tan | string | ||
IMAGE
COOR. SYS.
KEYWORDS |
LTV[1,2] | from 1 to 2048 | real | Image coordinate system reference pixel |
LTM[1,2]_1 | 1 or -1 | real | Image coordinate system scale | |
ATLAS
SPECIFIC
KEYWORDS |
C_OBDT | month/day/year | string | Date(s) of observation of the image |
C_CLDT | month/day/year | string | Date of observation of the calibrating image | |
C_M0 | from 20 to 40 | real | Zero point of the calibration in monochromatic magnitudes | |
C_SKY | from -100 to 15000 | real | Sky value (in counts) | |
C_SSKY | from 0 to 100 | real | Std. dev. of the sky (in counts) | |
C_ESKY | from 0 to 10 | real | Std. dev. of the mean of the sky (in counts) | |
C_K | from 0.1 to 0.3 | real | Extinction coefficient (mag/am) | |
C_AM | from 1 to 3 | real | Mean Airmass | |
C_TEXP | from 180 to 2100 | real | Exposure time | |
C_NCB | from 1 to 5 | integer | Number of frames combined | |
C_CC | 0. | real | B-R color coefficient of the calibration | |
C_BRI | 0.8 | real | Initial B-R color (UNUSED) | |
C_M0I | from 20 to 40 | real | C_M0 + 2.5 * log10(C_TEXP) - C_K * C_AM | |
C_STD | from 0.00 to 0.30 | real | Final error of the calibration | |
C_RSC | from 1 to 50 | real | R-band to Ha continuum scaling factor | |
C_ERSC | from 0 to 10 | real | Error in C_RSC | |
C_FLT | obs/filter | string | Observatory/Telescope + Filter:
LC_ -> LCO 100-inch PO_ -> PO 60-inch |
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C_F0I | from 0 to 1E-18 | real | erg/s/cm^2/count | |
C_EF0I | from 0 to 1E-19 | real | Error in C_F0I | |
C_F0F | from 0 to 1E-18 | real | Final erg/s/cm^2/count | |
C_EF0F | from 0 to 1E-19 | real | Error in C_F0F | |
C_PSF0 | from 0.6 to 4.3 | real | PSF before convolution (FWHM in arcsec) | |
C_PSF | from 0.6 to 4.3 | real | Final image PSF (FWHM in arcsec) | |
BASIC KEYWORDS | END | End of header |