THE PANCHROMATIC HUBBLE ANDROMEDA TREASURY. XV. the BEAST: BAYESIAN EXTINCTION and STELLAR TOOL

Karl D. Gordon; Morgan Fouesneau; Heddy Arab; Kirill Tchernyshyov; Daniel R. Weisz; Julianne J. Dalcanton; Benjamin F. Williams; Eric F. Bell; Luciana Bianchi; Martha Boyer; Yumi Choi; Andrew Dolphin; Léo Girardi; David W. Hogg; Jason S. Kalirai; Maria Kapala; Alexia R. Lewis; Hans Walter Rix; Karin Sandstrom; Evan D. Skillman

doi:10.3847/0004-637X/826/2/104

THE PANCHROMATIC HUBBLE ANDROMEDA TREASURY. XV. the BEAST: BAYESIAN EXTINCTION and STELLAR TOOL

Karl D. Gordon, Morgan Fouesneau, Heddy Arab, Kirill Tchernyshyov, Daniel R. Weisz, Julianne J. Dalcanton, Benjamin F. Williams, Eric F. Bell, Luciana Bianchi, Martha Boyer, Yumi Choi, Andrew Dolphin, Léo Girardi, David W. Hogg, Jason S. Kalirai, Maria Kapala, Alexia R. Lewis, Hans Walter Rix, Karin Sandstrom, Evan D. Skillman

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Abstract

We present the Bayesian Extinction And Stellar Tool (BEAST), a probabilistic approach to modeling the dust extinguished photometric spectral energy distribution of an individual star while accounting for observational uncertainties common to large resolved star surveys. Given a set of photometric measurements and an observational uncertainty model, the BEAST infers the physical properties of the stellar source using stellar evolution and atmosphere models and constrains the line of sight extinction using a newly developed mixture model that encompasses the full range of dust extinction curves seen in the Local Group. The BEAST is specifically formulated for use with large multi-band surveys of resolved stellar populations. Our approach accounts for measurement uncertainties and any covariance between them due to stellar crowding (both systematic biases and uncertainties in the bias) and absolute flux calibration, thereby incorporating the full information content of the measurement. We illustrate the accuracy and precision possible with the BEAST using data from the Panchromatic Hubble Andromeda Treasury. While the BEAST has been developed for this survey, it can be easily applied to similar existing and planned resolved star surveys.

Original language	English (US)
Article number	104
Journal	Astrophysical Journal
Volume	826
Issue number	2
DOIs	https://doi.org/10.3847/0004-637X/826/2/104
State	Published - Aug 1 2016

Bibliographical note

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© 2016. The American Astronomical Society. All rights reserved.

Keywords

Analysis - methods: statistical
Dust
Galaxies: individual (M31)
Methods: data
Stars: fundamental parameters
extinction

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Gordon, K. D., Fouesneau, M., Arab, H., Tchernyshyov, K., Weisz, D. R., Dalcanton, J. J., Williams, B. F., Bell, E. F., Bianchi, L., Boyer, M., Choi, Y., Dolphin, A., Girardi, L., Hogg, D. W., Kalirai, J. S., Kapala, M., Lewis, A. R., Rix, H. W., Sandstrom, K., & Skillman, E. D. (2016). THE PANCHROMATIC HUBBLE ANDROMEDA TREASURY. XV. the BEAST: BAYESIAN EXTINCTION and STELLAR TOOL. Astrophysical Journal, 826(2), Article 104. https://doi.org/10.3847/0004-637X/826/2/104

Gordon, KD, Fouesneau, M, Arab, H, Tchernyshyov, K, Weisz, DR, Dalcanton, JJ, Williams, BF, Bell, EF, Bianchi, L, Boyer, M, Choi, Y, Dolphin, A, Girardi, L, Hogg, DW, Kalirai, JS, Kapala, M, Lewis, AR, Rix, HW, Sandstrom, K & Skillman, ED 2016, 'THE PANCHROMATIC HUBBLE ANDROMEDA TREASURY. XV. the BEAST: BAYESIAN EXTINCTION and STELLAR TOOL', Astrophysical Journal, vol. 826, no. 2, 104. https://doi.org/10.3847/0004-637X/826/2/104

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abstract = "We present the Bayesian Extinction And Stellar Tool (BEAST), a probabilistic approach to modeling the dust extinguished photometric spectral energy distribution of an individual star while accounting for observational uncertainties common to large resolved star surveys. Given a set of photometric measurements and an observational uncertainty model, the BEAST infers the physical properties of the stellar source using stellar evolution and atmosphere models and constrains the line of sight extinction using a newly developed mixture model that encompasses the full range of dust extinction curves seen in the Local Group. The BEAST is specifically formulated for use with large multi-band surveys of resolved stellar populations. Our approach accounts for measurement uncertainties and any covariance between them due to stellar crowding (both systematic biases and uncertainties in the bias) and absolute flux calibration, thereby incorporating the full information content of the measurement. We illustrate the accuracy and precision possible with the BEAST using data from the Panchromatic Hubble Andromeda Treasury. While the BEAST has been developed for this survey, it can be easily applied to similar existing and planned resolved star surveys.",

keywords = "Analysis - methods: statistical, Dust, Galaxies: individual (M31), Methods: data, Stars: fundamental parameters, extinction",

author = "Gordon, {Karl D.} and Morgan Fouesneau and Heddy Arab and Kirill Tchernyshyov and Weisz, {Daniel R.} and Dalcanton, {Julianne J.} and Williams, {Benjamin F.} and Bell, {Eric F.} and Luciana Bianchi and Martha Boyer and Yumi Choi and Andrew Dolphin and L{\'e}o Girardi and Hogg, {David W.} and Kalirai, {Jason S.} and Maria Kapala and Lewis, {Alexia R.} and Rix, {Hans Walter} and Karin Sandstrom and Skillman, {Evan D.}",

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AU - Gordon, Karl D.

AU - Fouesneau, Morgan

AU - Arab, Heddy

AU - Tchernyshyov, Kirill

AU - Weisz, Daniel R.

AU - Dalcanton, Julianne J.

AU - Williams, Benjamin F.

AU - Bell, Eric F.

AU - Bianchi, Luciana

AU - Boyer, Martha

AU - Choi, Yumi

AU - Dolphin, Andrew

AU - Girardi, Léo

AU - Hogg, David W.

AU - Kalirai, Jason S.

AU - Kapala, Maria

AU - Lewis, Alexia R.

AU - Rix, Hans Walter

AU - Sandstrom, Karin

AU - Skillman, Evan D.

PY - 2016/8/1

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N2 - We present the Bayesian Extinction And Stellar Tool (BEAST), a probabilistic approach to modeling the dust extinguished photometric spectral energy distribution of an individual star while accounting for observational uncertainties common to large resolved star surveys. Given a set of photometric measurements and an observational uncertainty model, the BEAST infers the physical properties of the stellar source using stellar evolution and atmosphere models and constrains the line of sight extinction using a newly developed mixture model that encompasses the full range of dust extinction curves seen in the Local Group. The BEAST is specifically formulated for use with large multi-band surveys of resolved stellar populations. Our approach accounts for measurement uncertainties and any covariance between them due to stellar crowding (both systematic biases and uncertainties in the bias) and absolute flux calibration, thereby incorporating the full information content of the measurement. We illustrate the accuracy and precision possible with the BEAST using data from the Panchromatic Hubble Andromeda Treasury. While the BEAST has been developed for this survey, it can be easily applied to similar existing and planned resolved star surveys.

AB - We present the Bayesian Extinction And Stellar Tool (BEAST), a probabilistic approach to modeling the dust extinguished photometric spectral energy distribution of an individual star while accounting for observational uncertainties common to large resolved star surveys. Given a set of photometric measurements and an observational uncertainty model, the BEAST infers the physical properties of the stellar source using stellar evolution and atmosphere models and constrains the line of sight extinction using a newly developed mixture model that encompasses the full range of dust extinction curves seen in the Local Group. The BEAST is specifically formulated for use with large multi-band surveys of resolved stellar populations. Our approach accounts for measurement uncertainties and any covariance between them due to stellar crowding (both systematic biases and uncertainties in the bias) and absolute flux calibration, thereby incorporating the full information content of the measurement. We illustrate the accuracy and precision possible with the BEAST using data from the Panchromatic Hubble Andromeda Treasury. While the BEAST has been developed for this survey, it can be easily applied to similar existing and planned resolved star surveys.

KW - Analysis - methods: statistical

KW - Dust

KW - Galaxies: individual (M31)

KW - Methods: data

KW - Stars: fundamental parameters

KW - extinction

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THE PANCHROMATIC HUBBLE ANDROMEDA TREASURY. XV. the BEAST: BAYESIAN EXTINCTION and STELLAR TOOL

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