Monitoring dusty sources in the vicinity of Sgr A*

Abstract

We trace several dusty infrared sources on their orbit around the supermassive black hole (SMBH) SgrA* in the center of our galaxy. We give an overview of known and unknown sources in the direct vicinity of our SMBH in a radius of around 0.04pc. For that, we are using NACO (K- and L'-band) and SINFONI (H+K-band) data (VLT, Chile/Paranal) between 2002 and 2018. Our spectroscopic analysis reveals a Doppler-shifted line emission of Br_gamma and HeI. Additionally, we report the detection of [FeIII] lines that are found exclusively in the investigated dusty sources west of SgrA*. We speculate, that the known [FeIII] emission in the GC is partially generated due to the line emission of the Dusty sources investigated in this work. However, we extend our analysis of the GC by taking the bright Br_gamma-bar close (< 120 mas) to SgrA* into account. The finding of this feature is in line with a reported SgrA* X-ray bubble that consists of an open side towards G359.945-0.044 (North-West-West direction). The location of the open side of this X-ray bubble coincides with the emission of the bright Br_gamma-bar detected in our SINFONI data-cubes.

34 pages, 19 figures

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Cited by in corpus (6)

• S62 and S4711: Indications of a population of faint fast moving stars inside the S2 orbit -- S4711 on a 7.6 year orbit around Sgr~A*
• Evidence for a jet and outflow from Sgr A*: a continuum and spectral line study
• Near- and mid-infrared observations in the inner tenth of a parsec of the Galactic center -- Detection of proper motion of a filament very close to Sgr~A*
• First observed interaction of the circumstellar envelope of an S-star with the environment of Sgr A*
• Continuum polarization reverberation mapping of AGNs
• The Near-Infrared Spectrum of the Nuclear Star Cluster: Looking Below the Tip of the Iceberg and Comparisons with Extragalactic Nuclei