Discovery of multiple shells around the planetary nebula IC 418 (original) (raw)

NASA/ADS

;

• Vázquez, R. ;
• Guerrero, M. A. ;
• Olguín, L. ;
• Marquez-Lugo, R. A. ;
• Bravo-Alfaro, H.

Abstract

We have analysed optical, near- and mid-IR images of the bright planetary nebula (PN) IC 418. These images probe unambiguously for the first time a number of low surface brightness structures and shells around the bright main nebula, including radial filaments or rays, a system of three concentric rings and two detached haloes with sizes ∼150 arcsec and ?, respectively. The main nebula is slightly off-centred with respect to the elliptical outer halo. The time lapse between the two haloes is 10 000-50 000 yr, whereas the time lapse between the three concentric rings is ∼630 yr. We emphasize the advantages of near- and mid-IR imaging for the detection of faint structures and shells around optically bright nebulae.

Publication:

Monthly Notices of the Royal Astronomical Society

Pub Date:

July 2012

DOI:

10.1111/j.1365-2966.2012.21165.x

arXiv:

arXiv:1204.5816

Bibcode:

2012MNRAS.423.3753R

Keywords:

• ISM: jets and outflows;
• ISM: lines and bands;
• planetary nebulae: individual: IC 418;
• infrared: ISM;
• Astrophysics - Astrophysics of Galaxies;
• Astrophysics - Solar and Stellar Astrophysics

E-Print:

9 pages, 5 figures, accepted for publication in MNRAS