On the composition of H II regions in southern galaxies - I. NGC 300 and 1365

Pagel, B. E. J.; Edmunds, M. G.; Blackwell, D. E.; Chun, Mun-Suk; Smith, Graeme H.

doi:10.1093/mnras/189.1.95

Cited by 677 publications

(240 citation statements)

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“…Henry & Howard 1994), in particular at O/H abundances above solar, but the ranking of abundances appears fairly secure. There are several reasons to suspect that recent galactic evolution might aect G: (1) G's are aected by dynamical phenomena such as bars (Pagel et al 1979;ZKH;Martin & Roy 1994;Friedli, Benz, & Kennicutt 1994), (2) oxygen traces recent star formation because it is produced by T ype II SNe, and (3) infalling gas is likely to have a l o w er metallicity than disk gas.…”

Section: Data and Analysismentioning

confidence: 99%

Evidence for Recent Accretion in Nearby Galaxies

Zaritsky

1995

The Astrophysical Journal

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I discuss observations of magnitude residuals from the B-band Tully-Fisher relationship, B V color, chemical abundance gradients, and asymmetries in the H I and stellar disks of nearby spiral galaxies within the context of a model in which small satellites or H I clouds are accreted onto the outer disks of spiral galaxies. Correlations between the various observables support the hypothesis that accretion dilutes the gas phase abundances in the outer disk, steepens the abundance gradient across the disk, increases the star formation rate, and creates asymmetries in the outer disk. By estimating the duration of steep abundance gradients, elevated rates of star formation, or outer disk asymmetries, constraints can be placed on the rate of accretion events. The data suggest that accretion events at the current time are common.

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Section: Data and Analysismentioning

confidence: 99%

Evidence for Recent Accretion in Nearby Galaxies

Zaritsky

1995

The Astrophysical Journal

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“…These methods have first been introduced by Pagel et al (1979) to derive metallicities in giant extragalactic H ii regions. They have since then being reconsidered and recalibrated by many authors, among which Skillman (1989), McGaugh (1991, 1994, Pilyugin (2000Pilyugin ( , 2001.…”

Section: Strong Line or Statistical Methodsmentioning

confidence: 99%

“…They have since then being reconsidered and recalibrated by many authors, among which Skillman (1989), McGaugh (1991, 1994, Pilyugin (2000Pilyugin ( , 2001. Pagel et al (1979) proposed to use the 4 strongest lines of O and H : Hα, Hβ, [O ii] λ3727 and [O iii] λ5007. From Sect.…”

Section: Strong Line or Statistical Methodsmentioning

confidence: 99%

Abundance Determinations In HII Regions And Planetary Nebulae

Stasińska

2004

Cosmochemistry

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“…One of the most popular indicators for the metallicity of the gas is the R23 parameter proposed by Pagel et al (1979). This is defined as follows:…”

Section: Overview Of Emission Lines Diagnosticsmentioning

confidence: 99%

Inferring physical properties of galaxies from their emission-line spectra

Ucci

Ferrara

Gallerani

et al. 2016

Mon. Not. R. Astron. Soc.

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We present a new approach based on Supervised Machine Learning (SML) algorithms to infer key physical properties of galaxies (density, metallicity, column density and ionization parameter) from their emission line spectra. We introduce a numerical code (called game, GAlaxy Machine learning for Emission lines) implementing this method and test it extensively. game delivers excellent predictive performances, especially for estimates of metallicity and column densities. We compare game with the most widely used diagnostics (e.g. R 23 , [NII]λ6584 / Hα indicators) showing that it provides much better accuracy and wider applicability range. game is particularly suitable for use in combination with Integral Field Unit (IFU) spectroscopy, both for restframe optical/UV nebular lines and far-infrared/sub-mm lines arising from PhotoDissociation Regions. Finally, game can also be applied to the analysis of synthetic galaxy maps built from numerical simulations.

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On the composition of H II regions in southern galaxies - I. NGC 300 and 1365

Cited by 677 publications

References 0 publications

Evidence for Recent Accretion in Nearby Galaxies

Evidence for Recent Accretion in Nearby Galaxies

Abundance Determinations In HII Regions And Planetary Nebulae

Inferring physical properties of galaxies from their emission-line spectra

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