The chemical enrichment of the diffuse gas in the outer galaxy and the abundance gradient of the milky way

Limin Song; Todd M. Tripp; David V. Bowen; Kenneth R. Sembach

doi:10.1017/S1743921307014378

The chemical enrichment of the diffuse gas in the outer galaxy and the abundance gradient of the milky way

Limin Song, Todd M. Tripp, David V. Bowen, Kenneth R. Sembach

Astrophysical Sciences

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

Abstract

Using data from HST/STIS (Hubble Space Telescope / Space Telescope Imaging Spectrograph) and FUSE (Far Ultraviolet Spectroscopic Explorer) toward two QSOs, H1821+643 and HS0624+6907, we find that the overall metallicity of the Galactic Outer Arm is Z=0.30.5 Z with underabundant nitrogen and little depletion by dust. The results are consistent with those based on H II region measurements in the outer galaxy and provide additional constrains on models of the Galactic abundance gradient and Milky Way (MW) chemical evolution. The lower metallicity observed in the outer galaxy is consistent with abundance patterns observed in higher redshift damped Ly absorbers (DLAs) extrapolated to z=0. The slow metallicity evolution of DLAs could be due to the larger cross sections of the outer regions of galaxies combined with the observed metallicity gradients.

Original language	English (US)
Pages (from-to)	381-382
Number of pages	2
Journal	Proceedings of the International Astronomical Union
Volume	3
Issue number	S244
DOIs	https://doi.org/10.1017/S1743921307014378
State	Published - Jun 2007

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Abundance gradient
Metallicity

Access to Document

10.1017/S1743921307014378

Cite this

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title = "The chemical enrichment of the diffuse gas in the outer galaxy and the abundance gradient of the milky way",

abstract = "Using data from HST/STIS (Hubble Space Telescope / Space Telescope Imaging Spectrograph) and FUSE (Far Ultraviolet Spectroscopic Explorer) toward two QSOs, H1821+643 and HS0624+6907, we find that the overall metallicity of the Galactic Outer Arm is Z=0.30.5 Z with underabundant nitrogen and little depletion by dust. The results are consistent with those based on H II region measurements in the outer galaxy and provide additional constrains on models of the Galactic abundance gradient and Milky Way (MW) chemical evolution. The lower metallicity observed in the outer galaxy is consistent with abundance patterns observed in higher redshift damped Ly absorbers (DLAs) extrapolated to z=0. The slow metallicity evolution of DLAs could be due to the larger cross sections of the outer regions of galaxies combined with the observed metallicity gradients.",

keywords = "Abundance gradient, Metallicity",

author = "Limin Song and Tripp, {Todd M.} and Bowen, {David V.} and Sembach, {Kenneth R.}",

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language = "English (US)",

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pages = "381--382",

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publisher = "Cambridge University Press",

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TY - JOUR

T1 - The chemical enrichment of the diffuse gas in the outer galaxy and the abundance gradient of the milky way

AU - Song, Limin

AU - Tripp, Todd M.

AU - Bowen, David V.

AU - Sembach, Kenneth R.

PY - 2007/6

Y1 - 2007/6

N2 - Using data from HST/STIS (Hubble Space Telescope / Space Telescope Imaging Spectrograph) and FUSE (Far Ultraviolet Spectroscopic Explorer) toward two QSOs, H1821+643 and HS0624+6907, we find that the overall metallicity of the Galactic Outer Arm is Z=0.30.5 Z with underabundant nitrogen and little depletion by dust. The results are consistent with those based on H II region measurements in the outer galaxy and provide additional constrains on models of the Galactic abundance gradient and Milky Way (MW) chemical evolution. The lower metallicity observed in the outer galaxy is consistent with abundance patterns observed in higher redshift damped Ly absorbers (DLAs) extrapolated to z=0. The slow metallicity evolution of DLAs could be due to the larger cross sections of the outer regions of galaxies combined with the observed metallicity gradients.

AB - Using data from HST/STIS (Hubble Space Telescope / Space Telescope Imaging Spectrograph) and FUSE (Far Ultraviolet Spectroscopic Explorer) toward two QSOs, H1821+643 and HS0624+6907, we find that the overall metallicity of the Galactic Outer Arm is Z=0.30.5 Z with underabundant nitrogen and little depletion by dust. The results are consistent with those based on H II region measurements in the outer galaxy and provide additional constrains on models of the Galactic abundance gradient and Milky Way (MW) chemical evolution. The lower metallicity observed in the outer galaxy is consistent with abundance patterns observed in higher redshift damped Ly absorbers (DLAs) extrapolated to z=0. The slow metallicity evolution of DLAs could be due to the larger cross sections of the outer regions of galaxies combined with the observed metallicity gradients.

KW - Abundance gradient

KW - Metallicity

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JF - Proceedings of the International Astronomical Union

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ER -

The chemical enrichment of the diffuse gas in the outer galaxy and the abundance gradient of the milky way

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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