VLA observations at 7 mm of the planetary nebula IC 4997

Details VLA observations at 7 mm of the planetary nebula IC 4997 VLA observations at 7 mm of the planetary nebula IC 4997

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.336.1139g&link_type=abstract

Monthly Notice of the Royal Astronomical Society, Volume 336, Issue 4, pp. 1139-1142.

Astronomy and Astrophysics

Astronomy

2

Ism: Jets And Outflows, Planetary Nebulae: Individual: Ic 4997, Radio Continuum: Ism

Scientific paper

We present high angular resolution (0.1 arcsec) VLA observations at 7-mm wavelength towards the bipolar planetary nebula IC 4997. The 7-mm emission in IC 4997 is dominated by a bright, compact core, the flux density of which at this wavelength is about six times brighter than at 2.0 and 3.6 cm. We model the centimetre and millimetre continuum spectrum in terms of free-free emission from an ionized core-halo source. In this model a dense (2.6 × 106 cm-3), optically thick inner core dominates the millimetre emission, while a low-density (1 × 104 cm-3), optically thin halo dominates the centimetre emission. The spectral index of the core (between 2 cm and 7 mm) is α~= 1.6 +/- 0.1(Sν~να), which is consistent with optically thick free-free emission. An upper limit for the mass-loss rate that created this inner core is ~ 3 × 10-6 Msolar yr-1, suggesting that this core may have been formed at the end of the superwind phase.

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