Matches in SemOpenAlex for { <https://semopenalex.org/work/W1538343208> ?p ?o ?g. }
Showing items 1 to 54 of
54
with 100 items per page.
- W1538343208 abstract "Multilevel observations of formaldehyde (H_2CO) and methanol (CH_3OH) toward the nearby spiral galaxies NGC 253, Maffei 2, IC 342, M 82 and NGC 6946 are presented. H_2CO was detected in all galaxies (tentatively in NGC 6946). CH_3OH was detected in all objects with the notable exception of M 82. H_2CO line intensity ratios point out differences in gas density both between galaxies and within the central regions of individual objects. Model calculations show that the bulk of the gas emitting H_2CO in NGC 253 is at a density of ~10^4 cm^-3 , while the H_2CO lines in M 82 and IC 342 trace two different, spatially separated gas components with densities of <= 10^4 cm^-3 and ~10^6 cm^-3. The south-western molecular hotspot in M 82 and the center of IC 342 are the regions with the highest density. Methanol is subthermally excited in all galaxies, with the lowest excitation temperatures found in IC 342. The CH_3OH abundance in NGC 253 and the non-starburst nuclei of IC 342 and Maffei 2 are comparable. A map of the 3_k-2_k lines in NGC 253 shows that CH_3OH traces clumpy structures better than other molecules requiring high gas density to be excited. CH_3OH toward M 82 is at least an order of magnitude less abundant than in otherwise comparable galaxies. This confirms the existence of global chemical differences, and thus very large scale variations in the state of the molecular gas phase, even between galaxies commonly classified as starburst nuclei." @default.
- W1538343208 created "2016-06-24" @default.
- W1538343208 creator A5031958994 @default.
- W1538343208 creator A5059597617 @default.
- W1538343208 creator A5061667722 @default.
- W1538343208 date "1997-05-23" @default.
- W1538343208 modified "2023-09-25" @default.
- W1538343208 title "Dense gas in nearby galaxies XI. H_2CO and CH_3OH: Molecular abundances and physical conditions" @default.
- W1538343208 doi "https://doi.org/10.48550/arxiv.astro-ph/9705191" @default.
- W1538343208 hasPublicationYear "1997" @default.
- W1538343208 type Work @default.
- W1538343208 sameAs 1538343208 @default.
- W1538343208 citedByCount "0" @default.
- W1538343208 crossrefType "posted-content" @default.
- W1538343208 hasAuthorship W1538343208A5031958994 @default.
- W1538343208 hasAuthorship W1538343208A5059597617 @default.
- W1538343208 hasAuthorship W1538343208A5061667722 @default.
- W1538343208 hasBestOaLocation W15383432081 @default.
- W1538343208 hasConcept C121332964 @default.
- W1538343208 hasConcept C181500209 @default.
- W1538343208 hasConcept C184779094 @default.
- W1538343208 hasConcept C198352243 @default.
- W1538343208 hasConcept C2524010 @default.
- W1538343208 hasConcept C33923547 @default.
- W1538343208 hasConcept C44870925 @default.
- W1538343208 hasConcept C63585750 @default.
- W1538343208 hasConcept C98444146 @default.
- W1538343208 hasConceptScore W1538343208C121332964 @default.
- W1538343208 hasConceptScore W1538343208C181500209 @default.
- W1538343208 hasConceptScore W1538343208C184779094 @default.
- W1538343208 hasConceptScore W1538343208C198352243 @default.
- W1538343208 hasConceptScore W1538343208C2524010 @default.
- W1538343208 hasConceptScore W1538343208C33923547 @default.
- W1538343208 hasConceptScore W1538343208C44870925 @default.
- W1538343208 hasConceptScore W1538343208C63585750 @default.
- W1538343208 hasConceptScore W1538343208C98444146 @default.
- W1538343208 hasLocation W15383432081 @default.
- W1538343208 hasLocation W15383432082 @default.
- W1538343208 hasOpenAccess W1538343208 @default.
- W1538343208 hasPrimaryLocation W15383432081 @default.
- W1538343208 hasRelatedWork W1641631973 @default.
- W1538343208 hasRelatedWork W1690707023 @default.
- W1538343208 hasRelatedWork W2018460911 @default.
- W1538343208 hasRelatedWork W2154783802 @default.
- W1538343208 hasRelatedWork W2342416117 @default.
- W1538343208 hasRelatedWork W3098529280 @default.
- W1538343208 hasRelatedWork W3098997918 @default.
- W1538343208 hasRelatedWork W3102549633 @default.
- W1538343208 hasRelatedWork W3123828616 @default.
- W1538343208 hasRelatedWork W4308191026 @default.
- W1538343208 isParatext "false" @default.
- W1538343208 isRetracted "false" @default.
- W1538343208 magId "1538343208" @default.
- W1538343208 workType "article" @default.