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 used data from WISE, IRAS, and Herschel in conjuction with our previousobservations with SABOCA and LABOCA, and constructed the far-IR tosubmillimetre spectral energy distributions (SEDs) of dense cores in thefilamentary Seahorse infrared dark cloud (IRDC) G304.74+01.32. For the 12analysed cores, which include two IR dark cores (no WISE counterpart), nine IRbright cores, and one HII region, the mean dust temperature of the cold (warm)component, the mass, luminosity, H$_2$ number density, and surface density werederived to be $13.3\pm1.4$ K ($47.0\pm5.0$ K), $113\pm29$ M$_{\odot}$,$192\pm94$ L$_{\odot}$, $(4.3\pm1.2)\times10^5$ cm$^{-3}$, and $0.77\pm0.19$ gcm$^{-3}$, respectively. The HII region IRAS 13039-6108a was found to be themost luminous source in our sample ($(1.1\pm0.4)\times10^3$ L$_{\odot}$). Allthe cores were found to be gravitationally bound (i.e. the virial parameter$\alpha_{\rm vir}<2$). Seven out of 12 of the analysed cores (58%) were foundto lie above the mass-radius thresholds of high-mass star formation proposed inthe literature. The surface densities of $\Sigma>0.4$ g cm$^{-3}$ derived forthese seven cores also exceed the corresponding threshold for high-mass starformation. Five of the analysed cores (42%) show evidence of fragmentation intotwo components in the SABOCA 350 $\mu$m image. In addition to the HII regionsource IRAS 13039-6108a, some of the other cores in Seahorse also appear to becapable of giving birth to high-mass stars. The dense core population in theSeahorse IRDC has comparable average properties to the cores in thewell-studied Snake IRDC G11.11-0.12. The Seahorse core fragmentation mechanismsappear to be heterogenous, including cases of both thermal and non-thermalJeans instability. High-resolution follow-up studies are required to addressthe fragmented cores' genuine potential of forming high-mass stars.

astronomy and astrophysics

Dense cores in the Seahorse infrared dark cloud: physical properties  from modified blackbody fits to the far-infrared-submillimetre spectral  energy distributions