Dust in the Wheel: The Cartwheel Galaxy in the Mid-IR

Simple item page
dc.creatorCharmandaris, V.
dc.creatorLaurent, O.
dc.creatorMirabel, I. F.
dc.creatorGallais, P.
dc.creatorSauvage, M.
dc.creatorVigroux, L.
dc.creatorCesarsky, C.
dc.creatorAppleton, P. N.
dc.date1998-10-19
dc.date.accessioned2026-07-07T02:28:27Z
dc.date.available2026-07-07T02:28:27Z
dc.descriptionWe present mid-infrared images at $6.7 μm$ and $15 μm$ of ``The Cartwheel'' (AM~0035-33), the prototypical collisional ring galaxy. The observations, taken with ISOCAM, reveal the distribution of hot dust in the galaxy and its two companions in the north-east. The intensity of the mid-IR emission from the outer star forming ring of the Cartwheel shows considerable azimuthal variation and peaks at the most active H$α$ region of the ring. The 15 $μm$ to 6.7 $μm$ flux ratio of 5.2 is the highest among all the galaxies of our sample. A surprising result of our observations is the discovery of significant emission from the inner regions of the galaxy, including the inner ring, spokes and nucleus, where previously only low level H$α$ emission had been reported. At 6.7 $μm$, this emission is stronger than the one from the outer star forming ring, and at 15 $μm$, it represents 40% of the emission from the outer ring. The H$α$ to mid-IR flux ratios from the inner regions are consistent with the heating of grains from weak star formation activity.
dc.descriptionAccepted for publication in Astronomy and Astrophysics Main Journal, 6 pages + 1 EPS figure
dc.identifierhttps://arxiv.org/abs/astro-ph/9810276
dc.identifierhttp://arxiv.org/abs/astro-ph/9810276
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13128
dc.subjectAstrophysics
dc.titleDust in the Wheel: The Cartwheel Galaxy in the Mid-IR
dc.typetext

Files

Collections

arXiv