Observations of the 86 GHz SiO maser sources in the Central Parsec of the Galactic Centre
arXiv:1909.13753
Abstract
We present results of 3 mm observations of SiO maser sources in the Galactic Centre (GC) from observations with the Australia Telescope Compact Array between , along the transitions of the SiO molecule at at 86.243 GHz and at 85.640 GHz. We also present the results of the 3 mm observations with Atacama Large Millimeter/Submillimeter Array (ALMA). We detected 5 maser sources from the ATCA data, IRS 7, IRS 9, IRS 10EE, IRS 12N, and IRS 28; and 20 sources from the ALMA data including 4 new sources. These sources are predominantly late-type giants or emission line stars with strong circumstellar maser emission. We analyse these sources and calculate their proper motions. We also study the variability of the maser emission. IRS 7, IRS 12N and IRS 28 exhibit long period variability of the order of years, while other sources show steady increase or decrease in flux density and irregular variability over observation timescales. This behaviour is consistent with the previous observations.
arXiv comment22 pages, 5 figures, to be published in the proceedings of the XIII workshop on "Multifrequency Behaviour of High Energy Cosmic Sources - XIII - MULTIF2019", held on 3-8 June, 2019, in Palermo, Italy
References in corpus (28)
- Astropy: A Community Python Package for Astronomy
- The Galactic Center Massive Black Hole and Nuclear Star Cluster
- The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy's Central Black Hole: A Paradox of Youth
- Stellar Dynamics in the Galactic centre: Proper Motions and Anisotropy
- The nuclear star cluster of the Milky Way: proper motions and mass
- Really Cool Stars and the Star Formation History at the Galactic Center
- JHKL Photometry and the K-band Luminosity Function at the Galactic Center
- Kinematics of the old stellar population at the Galactic Center
- A Feature Movie of SiO Emission 20-100 AU from the Massive Young Stellar Object Orion Source I
- The Milky Way's Supermassive Black Hole: How good a case is it? A Challenge for Astrophysics & Philosophy of Science
- Dynamical Friction on Star Clusters near the Galactic Center
- An Improved Model of SiO Maser Emission in Miras
- A movie of a star: multi-epoch VLBA imaging of the SiO masers towards the Mira variable TX Cam
- KMOS view of the Galactic Centre - II. Metallicity distribution of late-type stars
- The origin of IRS 16: dynamically driven inspiral of a dense star cluster to the Galactic center?
- In situ formation of SgrA* stars via disk fragmentation: parent cloud properties and thermodynamics
- Pinpointing the near-infrared location of Sgr A* by correcting optical distortion in the NACO imager
- Is there a Supermassive Black Hole at the Center of the Milky Way?
- L- and M-band imaging observations of the Galactic Center region
- Dusty Sources at the Galactic Center: The N- and Q-band view with VISIR
- IRS 13N: a new comoving group of sources at the Galactic Center
- Circumstellar discs in Galactic centre clusters: Disc-bearing B-type stars in the Quintuplet and Arches clusters
- Radial Velocities of Stars in the Galactic Center
- Compact mid-IR sources east of galactic center source IRS5
- SiO Maser Forest at the Galactic Center
- Near-Infrared Variability Study of the Central 2.3 arcmin x 2.3 arcmin of the Galactic Centre I. Catalog of Variable Sources
- Monitoring the Galactic Centre with Australia Telescope Compact Array
- A Measurement of Proper Motions of SiO Maser Sources in the Galactic Center with the VLBA