NGC 7009 MUSE imaging spectroscopic survey Virtual Observatory Resource

Authors
  1. Walsh J.R.
  2. Monreal-Ibero A.
  3. Barlow M.J.
  4. Ueta T.
  5. Wesson R.,Zijlstra A.A.
  6. Kimeswenger S.
  7. Leal-Ferreira M.L.
  8. Otsuka M.
  9. Published by
    CDS
Abstract

The spatial structure of the emission lines and continuum over the 50-arcsecond extent of the nearby, O-rich, PN NGC 7009 (Saturn Nebula) have been observed with the MUSE integral field spectrograph on the ESO Very Large Telescope. This study concentrates on maps of line emission and their interpretation in terms of physical conditions. MUSE Science Verification data, in <0.6-arcsecond seeing, have been reduced and analysed as maps of emission lines and continuum over the wavelength range 4750-9350{AA}. The dust extinction, the electron densities and temperatures of various phases of the ionized gas, abundances of species from low to high ionization and some total abundances are determined using standard techniques. Emission line maps over the bright shells are presented, from neutral to the highest ionization available (HeII and [MnV]). For collisionally excited lines (CELs), maps of electron temperature (Te from [NII] and [SIII]) and density (Ne from [SII] and [ClIII]) are available and for optical recombination lines (ORLs) temperature (from the Paschen jump and ratio of HeI lines) and density (from high Paschen lines). These estimates are compared: for the first time, maps of the differences in CEL and ORL Te's have been derived, and correspondingly a map of t^2^ between a CEL and ORL temperature, showing considerable detail. Total abundances of only He and O were formed, the latter using three ionization correction factors. However the map of He/H is not flat, departing by ~2% from a constant value, with remnants corresponding to ionization structures. An integrated spectrum over an area of 2340-arcseconds squared was also formed and compared to 1D photoionization models. The spatial variation of a range of nebular parameters illustrates the complexity of the ionized media in NGC 7009. These MUSE data are very rich with detections of hundreds of lines over areas of hundreds of arcseconds squared and follow-on studies are outlined.

Keywords
  1. planetary-nebulae
  2. spectroscopy
  3. visible-astronomy
  4. chemical-abundances
Bibliographic source Bibcode
2018A&A...620A.169W
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/620/A169
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/620/A169
Document Object Identifer DOI
doi:10.26093/cds/vizier.36200169

Access

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History

2018-12-14T08:32:27Z
Resource record created
2018-12-14T08:32:27Z
Created
2019-01-08T13:48:01Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr