Maser emissions, “cosmic lasers” from interstellar and circumstellar medium, are produced by the amplification of stimulated emissions. Vibrant and compact maser sources are good targets for high-accuracy astrometry within the kinematic examine of the Milky Way.
A analysis staff from Nationwide Time Service Heart (NTSC) of the Chinese language Academy of Sciences performed a 22 GHz water maser survey in direction of the O-rich asymptotic big department (AGB) stars within the Sagittarius stellar stream. Utilizing the Nobeyama 45-m and Tidbinbilla DSS-43 70-m telescopes, 21 maser emissions had been discovered, of which 20 had been detected for the primary time.
The outcomes had been printed in Month-to-month Notices of the Royal Astronomical Society on Sept. 9.
The Sagittarius Stellar Stream is essentially the most outstanding stellar stream across the Milky Way, and is produced by the accretion and mergers of our Galaxy with its satellite dwarf galaxy, the Sagittarius Dwarf Spheroidal Galaxy.
“Investigation of this stream might assist scientists to probe the galactic evolution and dark matter distribution,” stated Prof. Wu Yuanwei, chief of the analysis staff.
The researchers studied the Galactic distributions of H2O and SiO maser-traced AGBs within the Sagittarius orbital airplane, and located an elongated construction in direction of the (l, b) ~ (340°, 40°) path.
To confirm the affiliation between masers and the Sagittarius tidal stream, they additional studied the 3D motions of those sources. Outcomes urged that these sources are nonetheless from the thick disk of the Milky Way, with a outstanding outward movement velocity of ~ 50 km s-1 away from the Galactic heart.
“There should exist maser emissions within the Sagittarius stream. The explanation why we nonetheless can not affirm masers inside the Sagittarius stream is the limitation of sensitivity of our survey and pattern bias,” stated Prof. Wu. “We’ll attempt extra samples in our future examine.”
Yuanwei Wu et al, Water-maser survey in direction of off-plane O-rich AGBs across the orbital airplane of the Sagittarius stellar stream, Month-to-month Notices of the Royal Astronomical Society (2022). DOI: 10.1093/mnras/stac1971
Quotation:
Trying to find maser emissions within the Sagittarius stellar stream (2022, September 9)
retrieved 9 September 2022
from https://phys.org/information/2022-09-maser-emissions-sagittarius-stellar-stream.html
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