Infrared Array Camera (IRAC) Observations of Planetary Nebulae

Details Infrared Array Camera (IRAC) Observations of Planetary Nebulae Infrared Array Camera (IRAC) Observations of Planetary Nebulae

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apjs..154..296h&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 154, Issue 1, pp. 296-301.

Astronomy and Astrophysics

Astronomy

40

Infrared: Ism, Ism: Planetary Nebulae: General, Ism: Planetary Nebulae: Individual: Alphanumeric: Hb 12, Ism: Planetary Nebulae: Individual: Ngc Number: Ngc 246, Ism: Planetary Nebulae: Individual: Ngc Number: Ngc 650, Ism: Planetary Nebulae: Individual: Ngc Number: Ngc 2440, Ism: Planetary Nebulae: Individual: Ngc Number: Ngc 3132, Ism: Planetary Nebulae: Individual: Ngc Number: Ngc 6543

Scientific paper

We present the initial results from the Infrared Array Camera (IRAC) imaging survey of planetary nebulae (PNs). The IRAC colors of PNs are red, especially in the 8.0 μm band. Emission in this band is likely due to contributions from two strong H2 lines and a [Ar III] line in that bandpass. IRAC is sensitive to the emission in the halos as well as in the ionized regions that are optically bright. In NGC 246, we have observed an unexpected ring of emission in the 5.8 and 8.0 μm IRAC bands not seen previously at other wavelengths. In NGC 650 and NGC 3132, the 8.0 μm emission is at larger distances from the central star compared to the optical and other IRAC bands, possibly related to the H2 emission in that band and the tendency for the molecular material to exist outside of the ionized zones. In the flocculi of the outer halo of NGC 6543, however, this trend is reversed, with the 8.0 μm emission bright on the inner edges of the structures. This may be related to the emission mechanism, where the H2 is possibly excited in shocks in the NGC 6543 halo, whereas H2 emission is likely fluorescently excited in the UV fields near the central star.

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