Cloud fragmentation and proplyd-like features in HII regions imaged by HST

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dc.creatorDe Marco, Orsola
dc.creatorO'Dell, C. R.
dc.creatorGelfond, Pamela
dc.creatorRubin, R. H.
dc.creatorGlover, S. C. O.
dc.date2006-02-24
dc.date.accessioned2026-07-07T11:25:18Z
dc.date.available2026-07-07T11:25:18Z
dc.descriptionWe have analyzed HST ACS and WFPC2 new and archival images of eight HII regions to look for new proto-planetary disks (proplyds) similar to those found in the Orion Nebula. We find a wealth of features similar in size (though many are larger) to the bright cusps around the Orion Nebula proplyds. None of them, however, contains a definitive central star. From this, we deduce that the new cusps may not be proplyds, but instead are fragments of molecular cloud material. Out of all the features found in the eight HII regions examined, only one, an apparent edge-on silhouette in M17, may have a central star. This feature might join the small number of bona fide proplyds found outside the Orion Nebula, in M8, M20 and possibly in M16. In line with the results found recently by Smith et al. (2005), the paucity of proplyds outside the Orion Nebula, may be explained by their transient nature as well as by the specific environmental conditions under whichthey can be observed.
dc.description51 pages; 19 figures; 5 tables. Accepted by AJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0602545
dc.identifierhttp://arxiv.org/abs/astro-ph/0602545
dc.identifierAstron.J.131:2580-2600,2006
dc.identifierdoi:10.1086/501528
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195464
dc.subjectAstrophysics
dc.titleCloud fragmentation and proplyd-like features in HII regions imaged by HST
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