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 present observations of the embedded massive young stellar object (YSO)candidate 08576nr292, obtained with X-shooter and SINFONI on the ESO Very LargeTelescope (VLT). The flux-calibrated, medium-resolution X-shooter spectrum (300- 2500 nm) includes over 300 emission lines, but no (photospheric) absorptionlines and is consistent with a reddened disk spectrum. Among the emission linesare three hydrogen series and helium lines, both permitted and forbidden metallines, and CO first-overtone emission. A representative sample of lines withdifferent morphologies is presented. The H alpha and Ca II triplet lines arevery strong, with profiles indicative of outflow and - possibly - infall,usually observed in accreting stars. These lines include a blue-shiftedabsorption component at ~ -125 km/s. The He I and metal-line profiles aredouble-peaked, with a likely origin in a circumstellar disk. The forbiddenlines, associated with outflow, have a single blue-shifted emission componentcentered at -125 km/s, coinciding with the absorption components in H alpha andCa II. SINFONI H- and K-band integral-field spectroscopy of the clusterenvironment demonstrates that the [Fe II] emission is produced by a jetoriginating at the location of 08576nr292. Because the spectral type of thecentral object cannot be determined, its mass remains uncertain. We argue that08576nr292 is an intermediate-mass YSO with a high accretion rate Mdot_acc ~10^-5 - 10^-6 Msun/yr. These observations demonstrate the potential ofX-shooter and SINFONI to study in great detail an accretion disk-jet system,rarely seen around the more massive YSOs.

The Intermediate-mass Young Stellar Object 08576nr292: Discovery of a disk-jet system