TY - JOUR
T1 - Discovery of multiple shells around the planetary nebula IC 418
AU - Ramos-Larios, G.
AU - Vázquez, R.
AU - Guerrero, M. A.
AU - Olguín, L.
AU - Marquez-Lugo, R. A.
AU - Bravo-Alfaro, H.
PY - 2012/7
Y1 - 2012/7
N2 - We have analysed optical, near- and mid-IR images of the bright planetary nebula (PN) IC418. 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 ~150arcsec and , respectively. The main nebula is slightly off-centred with respect to the elliptical outer halo. The time lapse between the two haloes is 10000-50000yr, whereas the time lapse between the three concentric rings is ~630yr. We emphasize the advantages of near- and mid-IR imaging for the detection of faint structures and shells around optically bright nebulae.
AB - We have analysed optical, near- and mid-IR images of the bright planetary nebula (PN) IC418. 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 ~150arcsec and , respectively. The main nebula is slightly off-centred with respect to the elliptical outer halo. The time lapse between the two haloes is 10000-50000yr, whereas the time lapse between the three concentric rings is ~630yr. We emphasize the advantages of near- and mid-IR imaging for the detection of faint structures and shells around optically bright nebulae.
KW - ISM: jets and outflows
KW - ISM: lines and bands
KW - Infrared: ISM
KW - Planetary nebulae: individual: IC418
UR - http://www.scopus.com/inward/record.url?scp=84863615639&partnerID=8YFLogxK
U2 - 10.1111/j.1365-2966.2012.21165.x
DO - 10.1111/j.1365-2966.2012.21165.x
M3 - Artículo
SN - 0035-8711
VL - 423
SP - 3753
EP - 3760
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -