SIMBAD references

2018ApJ...861...75T - Astrophys. J., 861, 75-75 (2018/July-1)

SiO masers in the Galactic bulge and disk: kinematics from the BAaDE survey.

TRAPP A.C., RICH R.M., MORRIS M.R., SJOUWERMAN L.O., PIHLSTROM Y.M., CLAUSSEN M. and STROH M.C.

Abstract (from CDS):

We present the first results from the Bulge Asymmetries and Dynamic Evolution (BAaDE) survey. Though only a subset of the complete survey (∼2700 out of ∼20,000 final sources), our data comprise the largest radio kinematic survey to date of stellar SiO masers observed toward the Galactic bulge and plane from -15° < l < +12° and -6° < b < +6°. Our sources include a substantial number of line-of-sight velocities in high extinction regions within ±1° of the Galactic plane. When matched with 2MASS4 photometry, our radio-detected sample lies significantly brighter than and redward of the first red giant branch tip, reaching extremes of (J - Ks)0 > 8, colors consistent with Mira variables and mass-losing AGB stars. We see a clean division into two kinematic populations: a kinematically cold (σ ∼ 50 km s–1) population that we propose is in the foreground disk, consisting of giants with 2MASS Ks < 5.5, and a kinematically hot (σ ∼ 100 km s–1) candidate bulge/bar population for most giants with Ks > 5.5. Only the kinematically hot giants with Ks > 5.5 include the reddest stars. Adopting 8.3 kpc to the Galactic center, and correcting for foreground extinction, we find that most of the sources have Mbol ∼ -5, consistent with their being luminous and possibly intermediate-age AGB stars. We note some tension between the possible intermediate age of the kinematically hot population, and its high-velocity dispersion compared to the disk.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy: bulge - Galaxy: kinematics and dynamics - stars: AGB and post-AGB

Simbad objects: 4

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2019.10.21-01:01:00

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