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

Six low-mass embedded sources (L1489, L1551-IRS5, TMR1, TMC1-A, L1527, andTMC1) in Taurus have been observed with Herschel-PACS to cover the fullspectrum from 50 to 210 $\mu$m as part of the Herschel key program, "Dust, Ice,and Gas In Time (DIGIT)". The relatively low intensity of the interstellarradiation field surrounding Taurus minimizes contamination of the [C II]emission associated with the sources by diffuse emission from the cloudsurface, allowing study of the [C II] emission from the source. In severalsources, the [C II] emission is distributed along the outflow, as is the [O I]emission. The atomic line luminosities correlate well with each other, as dothe molecular lines, but the atomic and molecular lines correlate poorly. Therelative contribution of CO to the total gas cooling is constant at $\sim$30 %,while the cooling fraction by H$_2$O varies from source to source, suggestingdifferent shock properties resulting in different photodissociation levels ofH$_2$O. The gas with a power-law temperature distribution with a moderatelyhigh density can reproduce the observed CO fluxes, indicative of CO close toLTE. However, H$_2$O is mostly subthermally excited. L1551-IRS5 is the mostluminous source ($L_{\rm bol}=24.5$ L$_\odot$) and the [O I] 63.1 $\mu$m lineaccounts for more than 70 % of its FIR line luminosity, suggesting completephotodissociation of H$_2$O by a J-shock. In L1551-IRS5, the central velocityshifts of the [O I] line, which exceed the wavelength calibration uncertainty($\sim$70 km s$^{-1}$) of PACS, are consistent with the known red- andblue-shifted outflow direction.

Herschel Key Program, "Dust, Ice, and Gas In Time" (DIGIT): the origin of molecular and atomic emission in low-mass protostars in Taurus