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IMAPS-1 Wavelength Calibration

The IMAPS-1 wavelengths were generated using an IDL routine (wave1.pro) which requires as input, the x and y pixel location, and the order number and wavelength, of one spectral feature identified in the IMAPS image. Based on this one fiducial wavelength, the program generates a wavelength array for each order. The starting wavelength and wavelength increment are then stored in the binary table extension contained in the coadded image FITS file.

The table below shows the wavelength (in Å ), order number, echelle position (1-4), x & y position (in pixels), and the line identification for the fiducial spectral feature used in each of the coadded, corrected IMAPS-1 images. Since these line identifications are the basis for the IMAPS-1 wavelength calibrations, any errors in these values would affect the wavelength calibration for that particular image.

Note that no other wavelength corrections have been applied to the IMAPS-1 files, and the source of the absorption line used determines the wavelength reference frame. For example, since most of the files use interstellar lines, the wavelength assignments would correspond to an interstellar reference frame. Note telluric lines were used for a few files.


 File   Wavelength  Order  Pos  X,Y Values  Element 
           (A)                   (pixels)
 
089_093  1063.1760   213   4   126,317      Fe II
094_098  1134.1650   199   1   114,463      N I
099_103  1096.8770   206   2   286,375      Fe II
104_108  1066.6600   212   3   75,318       Ar I
109_112  1064.9930   212   1   307,339      3,0 R(2)
113_116  1051.0341   215   2   284,287      4,0 P(1)
117_120  1077.6980   210   3   443,339      2,0 R(1)
121_122  1063.4611   213   4   251,315      3,0 R(1)
121_124  1063.4611   213   4   251,315      3,0 R(1)
125_128  1134.1650   199   1   112,468      N I
129_132  1096.8770   206   2   285,377      Fe II
134_136  1066.6600   212   3   67,321       Ar I
138_139  1048.2190   216   4   61,286       Ar I      
141_142  1064.9950   212   1   217,335      3,0 R(2) ?
143_144  1051.4990   215   2   470,286      4,0 R(2)
145_146  1066.9010   212   3   117,318      4,0 R(6)
150_152  1040.3669   217   1   241,335      5,0 P(2)
153_155  1081.2650   209   2   310,348      2,0 P(2)
156_158  1038.1560   218   3   432,260      5,0 P(1)
159_161  1078.9250   210   4   366,349      2,0 P(1)

 File   Wavelength  Order  Pos  X,Y Values  Element 
           (A)                   (pixels)

162_164  1064.9950   212   1   257,337      3,0 R(2) ?
165_167  1081.2650   209   2   330,348      2,0 P(2)
168_170  1092.7321   207   3   184,369      1,0 R(1)
171_172  1078.9250   210   4   375,348      2,0 P(1)
195_197  1064.6050   212   1   141,335      3,0 P(1)
198_199  1051.0341   215   2   353,286      4,0 P(1)
200_201  1038.1560   218   3   505,258      5,0 P(1)
202_204  1078.9250   210   4   441,353      2,0 P(1)
205_206  1049.9630   215   1   64,401       4,0 R(1)
207_209  1051.0341   215   2   282,354      4,0 P(1)
210_212  1038.1560   218   3   431,327      5,0 P(1)
213_214  1078.9250   210   4   358,408      2,0 P(1)
220_222  1064.9950   212   1   284,333      3,0 R(2) ?
223_224  1051.4990   215   2   536,284      4,0 R(2)
225_226  1066.9010   212   3   184,314      4,0 R(6)
227_229  1078.9250   210   4   407,341      2,0 P(1)
230_231  1064.9950   212   1   206,400      3,0 R(2) ?
232_233  1051.4990   215   2   453,356      4,0 R(2)
234_236  1066.9010   212   3   103,385      4,0 R(6)
237_238  1063.4600   213   4   203,380      3,0 R(1)

 File   Wavelength  Order  Pos  X,Y Values  Element 
           (A)                   (pixels)

276_277  1134.1650   199   1   173,465      N I
278_280  1096.8770   206   2   334,379      Fe II
286_288  1012.5010   223   1   252,300      S III ? 
289_290  1096.8770   206   2   258,441      Fe II
291_292  1066.6600   212   3   46,383       Ar I
293_294  1063.1760   213   4   123,379      Fe II?
296_299  1064.9950   212   1   301,338      3,0 R(2) ?
300_302  1081.2650   209   2   378,347      2,0 P(2)
303_305  1077.6980   210   3   500,339      2,0 R(1)
306_309  1078.9250   210   4   442,344      2,0 P(1)
310_312  1064.9950   212   1   334,403      3,0 R(2) ?
313_315  1081.2650   209   2   307,411      2,0 P(2)
316_319  1092.7321   207   3   171,443      1,0 R(1)
320_322  1078.9250   210   4   367,409      2,0 P(1)
331_333  1064.9950   212   1   152,336      3,0 R(2) ?
334_336  1051.0341   215   2   190,289      4,0 P(1)
337_339  1066.9010   212   3   53,321       4,0 R(6)
340_342  1078.9250   210   4   273,348      2,0 P(1)
343_346  1064.9950   212   1   245,270      3,0 R(2) ?
347_349  1051.4990   215   2   505,216      4,0 R(2)

 File   Wavelength  Order  Pos  X,Y Values  Element 
           (A)                   (pixels)

350_352  1066.9010   212   3   156,250      4,0 R(6)
353_355  1078.9250   210   4   379,279      2,0 P(1)
378_381  1064.9930   212   1   173,339      3,0 R(2) ?
382_385  1051.4990   215   2   430,290      4,0 R(2)
386_389  1038.1560   218   3   365,261      5,0 P(1)
390_394  1078.9250   210   4   300,347      2,0 P(1)
395_398  1049.9630   215   1   195,238      4,0 R(1)
399_402  1051.4990   215   2   537,215      4,0 R(2)
440_442  1039.2300   218   4   168,278      O I
443_445  1134.1650   199   1   198,441      N I
705_705  1134.9800   199   1   549,437      N I
706_707  1134.9800   199   1   550,436      N I
708_710  1066.6600   212   2   535,306      Ar I
711_712  1048.2190   216   3   525,270      Ar I
711_713  1048.2190   216   3   525,271      Ar I