{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"omics_type":["Unknown"],"volume":["593"],"submitter":["Trevino-Morales SP"],"pubmed_abstract":["The CO+ reactive ion is thought to be a tracer of the boundary between a HII region and the hot molecular gas. In this study, we present the spatial distribution of the CO+ rotational emission toward the Mon R2 star-forming region. The CO+ emission presents a clumpy ring-like morphology, arising from a narrow dense layer around the HII region. We compare the CO+ distribution with other species present in photon-dominated regions (PDR), such as [CII] 158 µm, H2 S(3) rotational line at 9.3 µm, polycyclic aromatic hydrocarbons (PAHs) and HCO+. We find that the CO+ emission is spatially coincident with the PAHs and [CII] emission. This confirms that the CO+ emission arises from a narrow dense layer of the HI/H2 interface. We have determined the CO+ fractional abundance, relative to C+ toward t"],"journal":["Astronomy and astrophysics"],"pagination":["L12"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC5055094"],"repository":["biostudies-literature"],"pubmed_title":["The first CO+ image: I. Probing the HI/H2 layer around the ultracompact HII region Mon R2."],"pmcid":["PMC5055094"],"pubmed_authors":["Trevino-Morales SP","Ossenkopf-Okada V","Gonzalez-Garcia M","Fuente A","Cernicharo J","Roueff E","Gerin M","Pety J","Sanchez-Monge A","Garcia-Burillo S","Kramer C","Rizzo JR","Berne O","Pilleri P","Goicoechea JR"],"additional_accession":[]},"is_claimable":false,"name":"The first CO+ image: I. Probing the HI/H2 layer around the ultracompact HII region Mon R2.","description":"The CO+ reactive ion is thought to be a tracer of the boundary between a HII region and the hot molecular gas. In this study, we present the spatial distribution of the CO+ rotational emission toward the Mon R2 star-forming region. The CO+ emission presents a clumpy ring-like morphology, arising from a narrow dense layer around the HII region. We compare the CO+ distribution with other species present in photon-dominated regions (PDR), such as [CII] 158 µm, H2 S(3) rotational line at 9.3 µm, polycyclic aromatic hydrocarbons (PAHs) and HCO+. We find that the CO+ emission is spatially coincident with the PAHs and [CII] emission. This confirms that the CO+ emission arises from a narrow dense layer of the HI/H2 interface. We have determined the CO+ fractional abundance, relative to C+ toward t","dates":{"release":"2016-01-01T00:00:00Z","publication":"2016 Sep","modification":"2025-04-04T18:39:24.885Z","creation":"2019-03-27T02:26:10Z"},"accession":"S-EPMC5055094","cross_references":{"pubmed":["27721515"],"doi":["10.1051/0004-6361/201628899"]}}