Volume 560, December 2013
|Number of page(s)||18|
|Published online||12 December 2013|
Key emission line integrated fluxes and ratios.
The following data products (FITS-files) are made available.
The calibrated long-slit spectra contain the long-slit spectra, fully calibrated as described in Sect. 2.3. All pertinent information concerning the observations (position, observation date, airmass, wavelengths, flux conversion factor etc.) are contained in the standard FITS header. In the second layer of this file, the “correction spectrum” is appended.
The fitting results contain the results of the pPXF + GANDALF fits (Sect. 2.4). This multi-layered file contains 1) the input spectrum (rebinned to ln, multiplied by 1e13 for computational reasons), 2) the best fitting model, 3) the best fitting emission line spectrum, 4) the best fitting spectrum with emission lines removed, 5) the derived stellar and gaseous parameters, 6) normalized weights assigned to each stellar template, and 7) the optimal combination of stellar templates.
The format of layer 5) is a 2-dimensional matrix with 101 columns (i.e. for each position in the long-slit spectrum). Each row contains the stellar kinematics; V, σ, h3, h4, h5, h6, and the gaseous kinematics; flux, amplitude, V, σ, Amplitude-over-Noise of each line (5/13 emission lines in the H/K band, see Table 3) for each position in the slit. The outer positions, where the S/N of the observations was extremely poor, were set to zero to reduce computation time.
This file structure is directly generated by pPXF and GANDALF, see the README file distributed with the GANDALF code for more information3.
Further, nuclear / off-nuclear integrated spectra are available in the same formats. These data offer a simple comparison between nuclear and off-nuclear regions in the full long-slit spectra. Calibrated spectra are given for a nuclear and two off-nuclear (symmetric about the nucleus) regions. The positions used to generate these summed spectra are indicated in the FITS-header. The pPXF + GANDALF fitting result contains a further fourth spectrum, which is the sum of the two off-nuclear region spectra.
© ESO, 2013
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