HIGH-RESOLUTION SPECTROSCOPY
OF THE MAGPOP-ITP dEs
La Palma International Time Programme
ELISA TOLOBAELISA TOLOBA
Universidad Complutense de Madrid, Spain
Instrumental Configuration (ISIS-WHT)
5 spectral ranges in 3 shots (using dichroics)5 spectral ranges in 3 shots (using dichroics)
Resolution Resolution FWHM 1.56FWHM 1.56ǺǺ (R=3100(R=3100) in the blue; ) in the blue; FWHM FWHM 3.223.22ǺǺ (R=2400(R=2400) in the red ) in the red
2 arcsec width slit2 arcsec width slit Exposure times needed: 3000 – 5000 secs per rangeExposure times needed: 3000 – 5000 secs per range
2.5 – 4 hours /galaxy2.5 – 4 hours /galaxy
4000 800070005000 6000 Ǻ
B1 (3500-4300 Ǻ)
B2 (4100-4900 Ǻ)
B3 (4800-5600 Ǻ)
R1 (5500-6700 Ǻ) R2 (7750-8950 Ǻ)
SAMPLE (I)GALAXYGALAXY RA(2000RA(2000
))DEC(2000DEC(2000
))EXPOSURE TIME EXPOSURE TIME
(S)(S)NGC3073NGC3073
10h00m52s10h00m52s 55º37’08’’55º37’08’’
B1B1 32003200
B2B2 30003000
B3B3 32003200
R1R1 32003200
R2R2 30003000
ID0734ID0734
02h41m35s02h41m35s -08º10’25’’-08º10’25’’
B1B1 54005400
B2B2 36003600
B3B3 42274227
R1R1 36003600
R2R2 54005400
SAMPLE (II)GALAXYGALAXY RA(2000RA(2000
))DEC(2000DEC(2000
))EXPOSURE TIME EXPOSURE TIME
(S)(S)ID0872ID0872
02h42m00s02h42m00s 00º00’52’’00º00’52’’
B1B1 36003600
B2B2 36003600
B3B3 36003600
R1R1 36003600
R2R2 36003600
NGC4306NGC4306
12h22m04s12h22m04s 12º47’15’’12º47’15’’
B1B1 34003400
B2B2 34003400
B3B3 22762276
R1R1 34003400
R2R2 34003400
REDUCTION PROCESS
REDUCEME (Cardiel 1999)
BiasBias
FlatFlat
DarkDark
TwilightTwilight
Wavelength calibration (Arcs)Wavelength calibration (Arcs)
Flux calibration (MILES stars)Flux calibration (MILES stars)
Building the final spectra: Building the final spectra:
Composition of 5 spectral Composition of 5 spectral
rangesranges
SPECTRA OBTAINED
(S/N)Å=129
(S/N)Å=31
(S/N)Å=33
(S/N)Å=47
SPECTRA OBTAINED
(S/N)Å=129
(S/N)Å=31
(S/N)Å=33
(S/N)Å=47
SPECTRAL FITS (I)
SPECTRAL FITS (II)
SPECTRAL FITS (III)
SPECTRAL FITS (IV)
INDEX-INDEX DIAGRAMS