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 analyse and report in detail new near-infrared (1.45 - 2.45 microns)observations of the Dusty S-cluster Object (DSO/G2) during its approach to theblack hole at the center of the Galaxy that were carried out with ESOVLT/SINFONI between February and September 2014. Before May 2014 we detectspatially compact Br-gamma and Pa-alpha line emission from the DSO at about40mas east of SgrA*. The velocity of the source, measured from the red-shiftedemission, is 2700+-60 km/s. No blue-shifted emission above the noise level isdetected at the position of SgrA* or upstream the presumed orbit. After May wefind spatially compact Br-gamma blue-shifted line emission from the DSO atabout 30mas west of SgrA* at a velocity of -3320+-60 km/s and no indication forsignificant red-shifted emission. We do not detect any significant extension ofvelocity gradient across the source. We find a Br-gamma-line full width at halfmaximum of 50+-10 Angstroem before and 15+-10 Angstroem after the peribothrontransit, i.e. no significant line broadening with respect to last year isobserved. Br-gamma line maps show that the bulk of the line emission originatesfrom a region of less than 20mas diameter. This is consistent with a verycompact source on an elliptical orbit with a peribothron time passage in2014.39+-0.14. For the moment, the flaring activity of the black hole in thenear-infrared regime has not shown any statistically significant increment.Increased accretion activity of SgrA* may still be upcoming. We discuss detailsof a source model according to which the DSO is rather a young accreting starthan a coreless gas and dust cloud.

Monitoring the Dusty S-Cluster Object (DSO/G2) on its Orbit towards the Galactic Center Black Hole