The information of the Milky Way From Two Micron All Sky Survey whole sky star count: The luminosity function

Chan Kao Chang; Chung Ming Ko; Ting Hung Peng

doi:10.1088/0004-637X/724/1/182

The information of the Milky Way From Two Micron All Sky Survey whole sky star count: The luminosity function

Chan Kao Chang, Chung Ming Ko, Ting Hung Peng

Graduate Institute of Astronomy

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

The logarithmic differential star count of the Two Micron All Sky Survey in Ks band can be well approximated by a single power-law luminosity function. With a fiducial Galactic structure, we measure the luminosity function for the entire Milky Way. The distribution of the power-law index is roughly isotropic and shows no obvious trend with the Galactic latitude. The value for the power-law index, the bright and the faint ends of the luminosity function are 1.85 ± 0.035, K_s = -7.86 ± 0.60 mag, and K_s = 6.88 ± 0.66 mag, respectively. Our result strongly supports the notion of a universal luminosity function in our Galaxy. We also find that the luminosity function of LMC/SMC is similar to that of the Milky Way.

Original language	English
Pages (from-to)	182-188
Number of pages	7
Journal	Astrophysical Journal
Volume	724
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/724/1/182
State	Published - 20 Nov 2010

Keywords

Galaxies: luminosity function, mass function
Galaxy: fundamental parameters
Galaxy: general
Galaxy: stellar content
Galaxy: structure
Infrared: stars

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10.1088/0004-637X/724/1/182

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title = "The information of the Milky Way From Two Micron All Sky Survey whole sky star count: The luminosity function",

abstract = "The logarithmic differential star count of the Two Micron All Sky Survey in Ks band can be well approximated by a single power-law luminosity function. With a fiducial Galactic structure, we measure the luminosity function for the entire Milky Way. The distribution of the power-law index is roughly isotropic and shows no obvious trend with the Galactic latitude. The value for the power-law index, the bright and the faint ends of the luminosity function are 1.85 ± 0.035, Ks = -7.86 ± 0.60 mag, and Ks = 6.88 ± 0.66 mag, respectively. Our result strongly supports the notion of a universal luminosity function in our Galaxy. We also find that the luminosity function of LMC/SMC is similar to that of the Milky Way.",

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T2 - The luminosity function

AU - Chang, Chan Kao

AU - Ko, Chung Ming

AU - Peng, Ting Hung

PY - 2010/11/20

Y1 - 2010/11/20

N2 - The logarithmic differential star count of the Two Micron All Sky Survey in Ks band can be well approximated by a single power-law luminosity function. With a fiducial Galactic structure, we measure the luminosity function for the entire Milky Way. The distribution of the power-law index is roughly isotropic and shows no obvious trend with the Galactic latitude. The value for the power-law index, the bright and the faint ends of the luminosity function are 1.85 ± 0.035, Ks = -7.86 ± 0.60 mag, and Ks = 6.88 ± 0.66 mag, respectively. Our result strongly supports the notion of a universal luminosity function in our Galaxy. We also find that the luminosity function of LMC/SMC is similar to that of the Milky Way.

AB - The logarithmic differential star count of the Two Micron All Sky Survey in Ks band can be well approximated by a single power-law luminosity function. With a fiducial Galactic structure, we measure the luminosity function for the entire Milky Way. The distribution of the power-law index is roughly isotropic and shows no obvious trend with the Galactic latitude. The value for the power-law index, the bright and the faint ends of the luminosity function are 1.85 ± 0.035, Ks = -7.86 ± 0.60 mag, and Ks = 6.88 ± 0.66 mag, respectively. Our result strongly supports the notion of a universal luminosity function in our Galaxy. We also find that the luminosity function of LMC/SMC is similar to that of the Milky Way.

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KW - Galaxy: fundamental parameters

KW - Galaxy: general

KW - Galaxy: stellar content

KW - Galaxy: structure

KW - Infrared: stars

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JF - Astrophysical Journal

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The information of the Milky Way From Two Micron All Sky Survey whole sky star count: The luminosity function

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Keywords

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