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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Spitzer IRAC observations of newly discovered planetary nebulae from the MACQUARIE-AAO-Strasbourg Hα planetary nebula project
Astrophysical Journal, Volume 669, No. 1, Year 2007
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Description
We compare Hα, radio continuum, and Spitzer Space Telescope images of 58 planetary nebulae (PNe) recently discovered by the Macquarie-AAO-Strasbourg Ha PN Project (MASH) of the SuperCOSMOS Ha Survey. Using Infrared Array Camera (IRAC) data, we examine the relationships between optical and MIR morphologies from 3.6 to 8.0 μm and explore the ratio of mid-infrared (MIR) to radio nebular fluxes, which is a valuable discriminant between thermal and nonthermal emission. MASH emphasizes late evolutionary stages of PNe compared with previous catalogs, enabling study of the changes in MIR and radio flux that attend the aging process. Spatially integrated fluxes are constructed for all MASH PNe observed by the GLIMPSE Legacy Project, using the Ha morphologies to define the areas of MIR and radio continuum emission observed by the Midcourse Space Experiment (MSX), IRAC, the Molonglo Observatory Synthesis Telescope, and the Very Large Array (VLA). The ratio of IRAC 8.0 μm to MSX 8.3 μm fluxes provides an assessment of the absolute diffuse calibration of IRAC at 8.0 μm. We independently confirm the aperture correction factor to be applied to IRAC at 8.0 μm to align it with the diffuse calibration of MSX. The result is in accord with the recommendations of the Spitzer Science Center and with our results from a parallel study of H II regions in the MIR and radio. However, these PNe probe the diffuse calibration of IRAC on a spatial scale of 9″-77″, as opposed to the many-arcminute scale from the H II regions' study. © 2007. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Cohen, Martin
United States, Berkeley
University of California, Berkeley
Parker, Quentin A.
Australia, Sydney
Macquarie University
Australia, Eastwood
Anglo Australian Observatory
Green, Anne J.
Australia, Sydney
The University of Sydney
Murphy, Tara
Australia, Sydney
The University of Sydney
Miszalski, Brent
Australia, Sydney
Macquarie University
France, Strasbourg
Université de Strasbourg
Frew, David J.
Australia, Sydney
Macquarie University
Australia, Bickley
Perth Observatory
Meade, Marilyn R.
United States, Madison
University of Wisconsin-madison
Babler, Brian L.
United States, Madison
University of Wisconsin-madison
Indebetouw, Rémy
United States, Charlottesville
University of Virginia
Whitney, Barbara A.
United States, Boulder
Space Science Institute
Watson, Christer
United States, North Manchester
Manchester University
Churchwell, Edward B.
United States, Madison
University of Wisconsin-madison
Statistics
Citations: 48
Authors: 12
Affiliations: 10
Identifiers
Doi:
10.1086/521427
ISSN:
0004637X
Research Areas
Environmental
Study Design
Cross Sectional Study
Study Approach
Quantitative