J/A+A/634/A47 Planetary nebula NGC3132 MUSE images (Monreal-Ibero+, 2020)
The MUSE view of the planetary nebula NGC 3132.
Monreal-Ibero A., Walsh J.R.
<Astron. Astrophys. 634, A47 (2020)>
=2020A&A...634A..47M 2020A&A...634A..47M (SIMBAD/NED BibCode)
ADC_Keywords: Planetary nebulae ; Spectroscopy
Keywords: planetary nebulae: individual: NGC 3132 - stars: AGB and post-AGB -
ISM: abundances - dust, extinction
Abstract:
Two-dimensional spectroscopic data for the whole extent of the NGC3132
planetary nebula have been obtained. We deliver a reduced data-cube
and high-quality maps on a spaxel-by-spaxel basis for the many
emission lines falling within the Multi-Unit Spectroscopic Explorer
(MUSE) spectral coverage over a range in surface brightness >1000.
Physical diagnostics derived from the emission line images, opening up
a variety of scientific applications, are discussed.
Data were obtained during MUSE commissioning on the European Southern
Observatory (ESO) Very Large Telescope and reduced with the standard
ESO pipeline. Emission lines were fitted by Gaussian profiles. The
dust extinction, electron densities, and temperatures of the ionised
gas and abundances were determined using Python and PyNeb routines.
The delivered datacube has a spatial size of ∼63"x123", corresponding
to ∼0.26x0.51pc2 for the adopted distance, and a contiguous
wavelength coverage of 4750-9300Å at a spectral sampling of
1.25Å/pix. The nebula presents a complex reddening structure with
high values (c(Hβ)∼0.4) at the rim. Density maps are compatible
with an inner high-ionisation plasma at moderate high density
(∼1000cm-3), while the low-ionisation plasma presents a structure in
density peaking at the rim with values ∼700cm-3. Median Te, using
different diagnostics, decreases according to the sequence
[NII],[SII]->[SIII]->[OI]->HeI->Paschen Jump. Likewise, the range of
temperatures covered by recombination lines is much larger than those
obtained from collisionally excited lines (CELs), with large spatial
variations within the nebula. If these differences were due to the
existence of high density clumps, as previously suggested, these
spatial variations would suggest changes in the properties and/or
distribution of the clumps within the nebula. We determined a median
helium abundance He/H=0.124, with slightly higher values at the
rim and outer shell. The range of measured ionic abundances for light
elements are compatible with literature values. Our kinematic analysis
nicely illustrates the power of 2D kinematic information in many
emission lines, which sheds light on the intrinsic structure of the
nebula. Specifically, our derived velocity maps support a geometry for
the nebula that is similar to the diabolo-like model previously
proposed, but oriented with its major axis roughly at P.A.∼22°. We
identified two low-surface brightness arc-like structures towards the
northern and southern tips of the nebula, with high extinction, high
helium abundance, and strong low-ionisation emission lines. They are
spatially coincident with some extended low-surface brightness
mid-infrared emission. The characteristics of the features suggest
that they could be the consequence of precessing jets caused by the
binary star system. A simple 1D Cloudy model is able to reproduce the
strong lines in the integrated spectrum of the whole nebula with an
accuracy of 15% .
Together with similar work with MUSE on NGC7009, the present study
illustrates the enormous potential of wide field integral field
spectrographs for the study of Galactic PNe.
Description:
The Planetary Nebula NGC3132 (PN G272.1+12.3) was observed
as part of commissioning run 2a of the MUSE instrument at the Very
Large Telescope on the night of 19 February 2014 and released by ESO
to the community afterwards.
We present the line flux maps and errors for same line flux maps. They
are corrected for Galactic extinction, and masked as described in
paper.
Objects:
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RA (2000) DE Designation(s)
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10 07 01.77 -40 26 11.1 NGC 3132 = PN G272.1+12.3
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 153 73 List of fits files
fits/* . 73 Individual fits files
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 F3.1 arcsec/pix scale Scale of the image
24- 26 I3 --- Nx Number of pixels along X-axis
28- 30 I3 --- Ny Number of pixels along Y-axis
32- 35 I4 --- Nz ? Number of slices, for the datacube
37- 59 A23 "datime" Obs.date Observation date
61- 67 F7.2 0.1nm blambda ? Lower value of wavelength interval,
for the datacube
69- 75 F7.2 0.1nm Blambda ? Upper value of wavelength interval,
for the datacube
77- 80 F4.2 0.1nm dlambda ? Wavelength resolution, for the datacube
82- 88 I7 Kibyte size Size of FITS file
90-112 A23 --- FileName Name of FITS file, in subdirectory fits
114-153 A40 --- Title Title of the FITS file
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Acknowledgements:
Ana Monreal-Ibero, amonreal(at)iac.es
(End) Patricia Vannier [CDS] 13-Jan-2020