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fors_extract_objects - Extract objects in slit spectra


esorex fors_extract_objects [OPTIONS] FILE.sof


This recipe is used to extract scientific objects spectra on a resampled image produced with recipe fors_resample, at the positions listed in the object table produced by recipe fors_detect_objects. Please refer to the FORS Pipeline User´s Manual for more details on object extraction.

In the table below the MXU acronym can be alternatively read as MOS and LSS, and SCI as STD.

Input files:

DO category: Type: Explanation: Required: MAPPED_SCI_MXU Calib Resampled slit spectra Y MAPPED_SKY_SCI_MXU Calib Resampled sky spectra Y OBJECT_TABLE_SCI_MXU Calib Object table Y

Output files:

DO category: Data type: Explanation: REDUCED_SCI_MXU FITS image Extracted object spectra REDUCED_SKY_SCI_MXU FITS image Extracted sky spectra REDUCED_ERROR_SCI_MXU FITS image Error on extracted spectra


--ext_mode <int>
Object extraction method: 0 = aperture, 1 = Horne optimal extraction (int; default: 1). The full name of this option for the EsoRex configuration file is fors.fors_extract_objects.ext_mode [default = 1].

Note that it is possible to create a configuration file containing these options, along with suitable default values. Please refer to the details provided by the 'esorex --help' command.


The full documentation for the fors pipeline can be downloaded as a PDF file using the following URL:

An overview over the existing ESO pipelines can be found on the web page

Basic documentation about the EsoRex program can be found at the esorex (1) man page.

It is possible to call the pipelines from python using the python-cpl package. See for further information.

The other recipes of the fors pipeline are fors_align_sky(7), fors_align_sky_lss(7), fors_bias(7), fors_calib(7), fors_config(7), fors_dark(7), fors_detect_objects(7), fors_detect_spectra(7), fors_extract(7), fors_extract_slits(7), fors_flatfield(7), fors_img_science(7), fors_img_screen_flat(7), fors_img_sky_flat(7), fors_normalise_flat(7), fors_photometry(7), fors_pmos_calib(7), fors_pmos_extract(7), fors_pmos_science(7), fors_remove_bias(7), fors_resample(7), fors_science(7), fors_spec_mflat(7), fors_subtract_sky(7), fors_subtract_sky_lss(7), fors_sumflux(7), fors_trace_flat(7), fors_wave_calib(7), fors_wave_calib_lss(7), fors_zeropoint(7)


fors_extract_objects 5.5.3


Carlo Izzo <>


Please report any problems to Alternatively, you may send a report to the ESO User Support Department <>.


This file is currently part of the FORS Instrument Pipeline Copyright (C) 2002-2010 European Southern Observatory

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

5.5.3 fors_extract_objects