English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report on the Submillimeter Array (SMA) observations of molecular lines at270 GHz toward W3(OH) and W3(H$_2$O) complex. Although previous observationsalready resolved the W3(H$_2$O) into two or three sub-components, the physicaland chemical properties of the two sources are not well constrained. Our SMAobservations clearly resolved W3(OH) and W3(H$_2$O) continuum cores. Taking theadvantage of the line fitting tool XCLASS, we identified and modeled a richmolecular spectrum in this complex, including multiple CH$_3$CN and CH$_3$OHtransitions in both cores. HDO, C$_2$H$_5$CN, O$^{13}$CS, and vibrationallyexcited lines of HCN, CH$_3$CN, and CH$_3$OCHO were only detected inW3(H$_2$O). We calculate gas temperatures and column densities for both cores.The results show that W3(H$_{2}$O) has higher gas temperatures, and largercolumn densities than W3(OH) as previously observed, suggesting physical andchemical differences between the two cores. We compare the molecular abundancesin W3(H$_2$O) to those in the Sgr B2(N) hot core, the Orion KL hot core and theOrion Compact Ridge, and discuss the chemical origin of specific species. Aneast-west velocity gradient is seen in W3(H$_2$O), and the extension isconsistent with the bipolar outflow orientation traced by water masers andradio jets. A north-south velocity gradient across W3(OH) is also observed.However, with current observations we can not assure if the velocity gradientsare caused by rotation, outflow or radial velocity differences of thesub-components in W3(OH).

SMA Observations of W3(OH) Complex: Physical and Chemical Differentiation between W3(H$_2$O) and W3(OH)