2022
DOI: 10.1093/mnras/stac1596
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An MCMC approach to the three-dimensional structure of the Milky Way bulge using OGLE-IV δ Scuti stars

Abstract: We present an analysis of high latitude δ Scuti stars (|b| > 1○) in the Galactic bulge region (−8○.3 < l < 9○.4) using a clean sample of the photometric data of 7,440 stars recently released by the OGLE-IV project. The geometrical parameters of the bulge are determined based on Maximum Likelihood (ML) analysis in five-dimensional parameter space. More refined values of these parameters as well as their uncertainties are obtained from a fully Bayesian Markov Chain Monte Carlo (MCMC) analysi… Show more

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Cited by 6 publications
(9 citation statements)
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References 62 publications
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“…The smaller the bar angle, the larger the mass along the line of sight and then the larger the optical depth and number of events. As seen from the values of τ and Γ (Table 1) and the timescale distribution, the agreement of our fiducial model and the recent model of Deka et al (2022;see Appendix C.5) with the data suggests a Galactic bar around our fiducial angle f ; 28°.…”
Section: C1 Geometrysupporting
confidence: 84%
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“…The smaller the bar angle, the larger the mass along the line of sight and then the larger the optical depth and number of events. As seen from the values of τ and Γ (Table 1) and the timescale distribution, the agreement of our fiducial model and the recent model of Deka et al (2022;see Appendix C.5) with the data suggests a Galactic bar around our fiducial angle f ; 28°.…”
Section: C1 Geometrysupporting
confidence: 84%
“…The stellar mass of the bulge is taken to be M bulge = 1.88 × 10 10 M e (including the presence of a "photometric" nonaxisymmetric long bar; Portail et al 2017), and the angle of the bar f = 28° (Wegg & Gerhard 2013;Wegg et al 2015). This bulge model is in good agreement with the one derived recently by using OGLE-IV δ Scuti stars (Deka et al 2022). A more thorough comparison between these two models is given in Appendix C.5.…”
Section: Bulgesupporting
confidence: 53%
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“…The smaller the bar angle, the larger the mass along the l.o.s and then the larger the optical depth and the number of events. As seen from the values of τ and Γ (Table 2) and the timescale distribution, the agreement of our fiducial model and of the recent model of Deka et al (2022) (see §C.5 below) with the data suggests a Galactic bar around our fiducial angle φ 28 o .…”
Section: C1 Geometrysupporting
confidence: 82%
“…The stellar mass of the bulge is taken to be M bulge = 1.88 × 10 10 M (including the presence of a 'photometric' non-axisymmetric long bar (Portail et al 2017b)) and the angle of the bar φ = 28 0 (Wegg et al 2013(Wegg et al , 2015. This bulge model is in good agreement with the one derived recently by using OGLE-IV δ Scuti stars (Deka et al 2022). A more thorough comparison between these two models is given in App.…”
Section: Bulgesupporting
confidence: 57%