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- W2000670930 abstract "We present images of the planetary nebulae NGC 7354 and NGC 3242 in four mid-infrared (MIR) photometric bands centred at 3.6, 4.5, 5.8 and 8.0 μm, the results of observations undertaken using the Spitzer Space Telescope. The resulting images show the presence of a halo and rings in NGC 3242, as previously observed through narrow-band imaging at visual wavelengths, as well as evidence for a comparable halo and ring system in NGC 7354. This is the first time that a halo and rings have been observed in the latter source. Similarly, whilst partial rings may have been previously detected in the MIR (for the source NGC 3132), the present observations appear to constitute the first detections of complete ring systems outside of the visual wavelength regime. The halo/core emission ratios appear to be preferentially higher at MIR wavelengths than is the case in the visible, and show less steep fall-offs than those observed in the [O iii]λλ4959+ 5007 Å transitions. The variation in surface brightness S with radial distance R, where this is approximated by the power-law relation S∝R−β, implies exponents 1.7 < β < 4 in the inner portions of the haloes, and 4.5 < β < 12 towards the outer limits of these structures. The value of β is also, in most cases, somewhat smaller at longer wavelengths." @default.
- W2000670930 created "2016-06-24" @default.
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- W2000670930 date "2009-11-01" @default.
- W2000670930 modified "2023-10-01" @default.
- W2000670930 title "Rings and haloes in the mid-infrared: the planetary nebulae NGC 7354 and NGC 3242" @default.
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- W2000670930 doi "https://doi.org/10.1111/j.1365-2966.2009.15379.x" @default.
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