J/MNRAS/410/2257 Galactic planetary nebulae at 24µm (Phillips+, 2011)
MIPSGAL 24µm observations of Galactic planetary nebulae.
Phillips J.P., Marquez-Lugo R.A.
<Mon. Not. R. Astron. Soc., 410, 2257-2273 (2011)>
=2011MNRAS.410.2257P 2011MNRAS.410.2257P
ADC_Keywords: Planetary nebulae ; Photometry, infrared
Keywords: dust, extinction - ISM: jets and outflows -
planetary nebulae: general - infrared: ISM
Abstract:
We have obtained 24µm imaging, profiles and fluxes for 224
planetary nebulae (PNe) lying within the limits of the Galactic survey
undertaken with the Multiband Imaging Photometer for Spitzer
(MIPSGAL). It is noted that most of the PNe having extended 24µm
emission also possess circular morphologies, suggesting that the
emission derives from cool grains located within the Asymptotic Giant
Branch (AGB) mass-loss regimes. Certain of these haloes are found to
have a surface brightness fall-off which may be consistent with
secularly invariant mass loss within the PNe progenitors. By contrast,
the 8.0µm envelopes are detected out to smaller distances from the
nuclei, and have a steeper rate of surface brightness fall-off; a
phenomenon which may arise from changes in the excitation of
polycyclic aromatic hydrocarbons (PAHs) within external
photo-dissociation regimes (PDRs). Our 24µm fluxes are compared to
those in previously published studies, and this appears to indicate
that many of the prior fluxes have been underestimated; a disparity
may imply that previous aperture sizes were too small. We have also
combined our 24µm fluxes with measures at shorter mid-infrared
(MIR) wavelengths, taken with the Infrared Array Camera (IRAC). These
are used to investigate the positioning of PNe within the IRAC-MIPSGAL
colour planes. The [8.0]-[24] and [5.8]-[24] colours are found to be
large, and extend over the respective ranges 3.4-8.7mag, and
5.4-10.3mag; indices which are only explainable where a broad range of
mechanisms contribute to the fluxes, including PAH bands, cool dust
continua and a variety of ionic transitions. These and other
components also affect the morphologies of the sources, and lead to
wavelength-dependent changes in the widths of the profiles.
Description:
We have acquired 24um profiles images and fluxes for 224 Galactic
PNe. The positions of the sources were taken from the Acker et al.
(1992, Cat. V/84), MASH I (Parker et al., 2006MNRAS.373...79P 2006MNRAS.373...79P, Cat.
V/127) and MASH II (Miszalski et al., 2008MNRAS.384..525M 2008MNRAS.384..525M, Cat. V/127)
catalogues, and correspond to the so-called 'true' PNe whose
identification is regarded as being highly probable. Sources
designated as 'likely' or 'possible' are excluded from this
analysis.
The MISPGAL results were taken between 2005 and 2006 using the mips.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 90 223 24µm photometry of MIPSGAL Planetary Nebulae
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See also:
V/84 : Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (Acker+, 1992)
V/127 : MASH Catalogues of Planetary Nebulae (Parker+ 2006-2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- PNG PNG designation (GLLL.l+BB.bA)
14- 27 A14 --- Name Usual name
29- 33 A5 --- Cat Original catalog (1)
35- 36 I2 h RAh Right ascension (J2000)
38- 39 I2 min RAm Right ascension (J2000)
41- 45 F5.2 s RAs Right ascension (J2000)
47 A1 --- DE- Declination sign (J2000)
48- 49 I2 deg DEd Declination (J2000)
51- 52 I2 arcmin DEm Declination (J2000)
54- 57 F4.1 arcsec DEs Declination (J2000)
59- 61 I3 arcsec B [24/240] Aperture size
63- 70 E8.3 mJy F24 [19.9/26900] Flux at 24um
72- 79 E8.3 mJy e_F24 [1.5/663] rms uncertainty on F24
81- 85 F5.2 mag [24] [-1.5/6.4] 24um magnitude
87- 90 F4.2 mag e_[24] [0/0.65] rms uncertainty on [24]
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Note (1): Original catalog code as follows:
ACKER = Strasbourg-ESO Catalogue of Galactic Planetary Nebulae,
Acker et al., 1992, Cat. V/84
MASH1 = MASH1, from MASH Catalogues of Planetary Nebulae,
Parker et al., 2006MNRAS.373...79P 2006MNRAS.373...79P, Cat. V/127
MASH2 = MASH2, from MASH Catalogues of Planetary Nebulae,
Miszalski et al., 2008MNRAS.384..525M 2008MNRAS.384..525M, Cat. V/127
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 07-Jul-2015