PPAK integral field spectroscopy survey of the Orion nebula. Data release
- Author(s)
- S. F. Sánchez, N. Cardiel, M. A. W. Verheijen, D. Martín-Gordón, J. M. Vilchez, J. Alves
- Abstract
Aims:We present a low-resolution spectroscopic survey of the Orion nebula. The data are released for public use. We show the possible applications of this dataset analyzing some of the main properties of the nebula.
Methods: We perform an integral field spectroscopy mosaic of an area of ~5 arcmin× 6 arcmin centered on the Trapezium region of the nebula, including the ionization front to the south-east. Analysis of the line fluxes and line ratios of both the individual and integrated spectra allowed us to determine the main characteristics of the ionization throughtout the nebula.
Results: The final dataset comprises 8182 individual spectra, sampled in a circular area of ~2.7 arcsec diameter. The data can be downloaded as a single row-stacked spectra fit file plus a position table or as an interpolated datacube with a final sampling of 1.5 arcsec/pixel. The integrated spectrum across the field-of-view was used to obtain the main integrated properties of the nebula, including the electron density and temperature, the dust extinction, the Hα integrated flux (after correcting for dust reddening), and the main diagnostic line ratios. The individual spectra were used to obtain line intensity maps of the different detected lines. These maps were used to study the distribution of the ionized hydrogen, the dust extinction, the electron density and temperature, and the helium and oxygen abundance. All of them show a considerable degree of structure as already shown in previous studies. In particular, there is a tight relation between the helium and oxygen abundances and the ionization structure that cannot be explained by case B recombination theory. Simple arguments like partial ionization and dust mixed with the emitting gas may explain these relations. However a more detailed modeling is required, for which we provide the dataset.
Based on observations collected at the
Centro Astronḿico Hispano Alemán (CAHA) at Calar Alto, operated jointly
by the Max-Planck Institut für Astronomie and the Instituto de Astrofísica de Andalucía (CSIC).- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Centro Astronómico Hispano Alemán (CAHA), University of Groningen, Instituto de Astrofísica de Andalucía (CSIC), Universidad Complutense de Madrid
- Journal
- Astronomy & Astrophysics
- Volume
- 465
- Pages
- 207-217
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361:20066620
- Publication date
- 04-2007
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy
- Keywords
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/7b3a4774-89bc-40f5-af8a-decb4b41990a