1. RRI Digital Repository
  2. 04. Astronomy and Astrophysics
  3. Research Papers (A&A)
Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1642
Full metadata record
DC FieldValueLanguage
dc.contributor.authorRoshi, Anish D.-
dc.contributor.authorDe Pree, C.G.-
dc.contributor.authorGoss, W.M.-
dc.contributor.authorAnantharamaiah, K.R.-
dc.date.accessioned2007-01-02T11:24:03Z-
dc.date.available2007-01-02T11:24:03Z-
dc.date.issued2006-06-10-
dc.identifier.citationAstrophysical Journal, 2006, Vol.644, p279-282en
dc.identifier.issn0004-637X-
dc.identifier.issn1538-4357 (online)-
dc.identifier.urihttp://hdl.handle.net/2289/1642-
dc.descriptionRestricted Access. Restricted Access. Articles older than 2 years are open to all at the journal site (alternative location)en
dc.description.abstractWe have detected C91α (8.5891 GHz) emission toward four ultracompact H II regions (UCHs; W49G, J, L, and C) in the W49 North massive star-forming region with the Very Large Array (VLA) at 3" resolution. No carbon line emission was detected toward UCHs W49F, A, O, S, and Q at this frequency to a 3 σ level of 2 mJy. We also observed the same region in the C75α line (15.3 GHz) with no detection at a 3 σ level of 6 mJy with a 1.7" beam. Detection of line emission toward these sources add supporting data to the 2005 result of Roshi et al. that many UCHs have an associated photodissociation region (PDR). The similarity of the LSR velocities of carbon recombination lines and H2CO absorption toward UCHs in W49 North suggests that the PDRs reside in the dense interface zone surrounding these H II regions. Combining the observed carbon line parameters at 8.6 GHz with the upper limits on line emission at 15.3 GHz, we obtain constraints on the physical properties of the PDRs associated with W49G and J. The upper limit on the number density of hydrogen molecule obtained from carbon line models is ~5×106 cm-3.en
dc.format.extent208262 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherThe University of Chicago Press for the American Astronomical Societyen
dc.relation.urihttp://adsabs.harvard.edu/cgi-bin/bib_query?2006ApJ...644..279Ren
dc.relation.urihttp://dx.doi.org/10.1086/503316en
dc.rights(2006) by the American Astronomical Society.en
dc.subjectISM: H II Regionsen
dc.subjectISM: Generalen
dc.subjectLine: Formationen
dc.subjectRadio Continuum: ISMen
dc.subjectRadio Lines: ISMen
dc.titleVLA observations of carbon 91α recombination line emission in W49 northen
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

Files in This Item:
File Description SizeFormat 
2006 ApJ V644 p279.pdf
  Restricted Access		Restricted Access203.38 kBAdobe PDFView/Open Request a copy
Show simple item record


Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.