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J/A+A/497/41        Average Early-type galaxies NIR spectrum   (Cesetti+, 2009)

Early-type galaxies in the near-infrared: 1.5-2.4µm spectroscopy. Cesetti M., Ivanov V.D., Morelli L., Pizzella A., Buson L., Corsini E.M., Dalla Bonta E., Stiavelli M., Bertola F. <Astron. Astrophys. 497, 41 (2009)> =2009A&A...497...41C
ADC_Keywords: Galaxies, IR ; Galaxies, spectra Keywords: infrared: galaxies - Galaxy: abundances - galaxies: elliptical and lenticular, cD - galaxies: spiral - galaxies: stellar content Abstract: Near-infrared (hereafter NIR) data may provide complementary information to the traditional optical population synthesis analysis of unresolved stellar populations because the spectral energy distribution of the galaxies in the 1-2.5um range is dominated by different types of stars than at optical wavelengths. Furthermore, NIR data are less affected by dust absorption and hence could constrain the stellar populations in dust-obscured galaxies. We attempt to develop observational constraints on the stellar populations of unresolved stellar systems in the NIR. Description: Studies of composite stellar systems (i.e. galaxies hosting an AGN) often need to subtract the contribution of the underlying galaxy). This prompted us to create an average spectrum of the galaxies in our sample. We used a homogenized subset of eight galaxies observed with SofI at NTT, with high signal-to-noise ratio and excluding the objects with young populations to create an average spectrum of the galaxies in our sample. The average age of the galaxies used to create the composite spectrum is 9±2Gyr (the median is 9.5Gyr) and the average [Fe/H] is 0.17±0.13 (the median is 0.16). The values of the spectrum are in arbitrary units and normalized to unity at 22000Å. The regions with zero r.m.s. values per Angstrom at the beginning and the at the and are covered only by one or two spectra. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table5.dat 21 9908 Average spectrum of the sample galaxies
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 5 I5 0.1nm Lambda [14944,24851] Spectrum Wavelengh 9- 13 F5.3 --- Flux Avarage spectrum in arbitrary units and normalized to unity at 22000Å (2.2µm) 17- 21 F5.3 --- rms r.m.s. values per Angstroem
Acknowledgements: Mary Cesetti, anna.marino(at)
(End) Mary Cesetti [ESO, Chile], Patricia Vannier [CDS] 04-Sep-2008
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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