The 5° Diameter Ionized Halo of the Planetary Nebula Abell 36 | Zendy

P. R. McCullough | Zendy; Chad F. Bender | Zendy; John E. Gaustad | Zendy; W. Rosing | Zendy; D. van Buren | Zendy

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The 5° Diameter Ionized Halo of the Planetary Nebula Abell 36

Author(s) -

P. R. McCullough,

Chad F. Bender,

John E. Gaustad,

W. Rosing,

D. van Buren

Publication year - 2001

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/319409

Subject(s) - physics , halo , astrophysics , nebula , planetary nebula , astronomy , surface brightness , ionization , emission nebula , galactic halo , galaxy , stars , ion , quantum mechanics

We have observed an ionized halo surrounding the planetary nebula Abell 36. It is barrel-shaped, with dimensions 4° × 5°, which is 17 pc × 21 pc at a distance of 240 pc. With an average Hα surface brightness of 0.8 ± 0.2 rayleighs, the halo's total Hα flux, 8.3 × 10-10 ergs cm-2 s-1, exceeds that of the previously known inner part of the nebula by a factor of 30. The ionized mass of the halo is 48 M⊙, where is the filling factor of the ionized gas. Velocity-resolved Hα spectra indicate that the halo is ambient interstellar matter and not matter ejected from the planetary nebula. The edges of the halo are evident in both 100 μm emission and red optical continuum.

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