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Oxygen and neon abundances of planetary nebulae in the elliptical galaxy NGC 4697

Research output: Contribution to journalArticle

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Oxygen and neon abundances of planetary nebulae in the elliptical galaxy NGC 4697. / Mendez, R. H.; Thomas, D; Saglia, R. P.; Maraston, C; Kudritzki, R. P.; Bender, R.

In: The Astrophysical Journal, Vol. 627, No. 2, 10.07.2005, p. 767-781.

Research output: Contribution to journalArticle

Harvard

Mendez, RH, Thomas, D, Saglia, RP, Maraston, C, Kudritzki, RP & Bender, R 2005, 'Oxygen and neon abundances of planetary nebulae in the elliptical galaxy NGC 4697', The Astrophysical Journal, vol. 627, no. 2, pp. 767-781.

APA

Mendez, R. H., Thomas, D., Saglia, R. P., Maraston, C., Kudritzki, R. P., & Bender, R. (2005). Oxygen and neon abundances of planetary nebulae in the elliptical galaxy NGC 4697. The Astrophysical Journal, 627(2), 767-781.

Vancouver

Mendez RH, Thomas D, Saglia RP, Maraston C, Kudritzki RP, Bender R. Oxygen and neon abundances of planetary nebulae in the elliptical galaxy NGC 4697. The Astrophysical Journal. 2005 Jul 10;627(2):767-781.

Author

Mendez, R. H. ; Thomas, D ; Saglia, R. P. ; Maraston, C ; Kudritzki, R. P. ; Bender, R. / Oxygen and neon abundances of planetary nebulae in the elliptical galaxy NGC 4697. In: The Astrophysical Journal. 2005 ; Vol. 627, No. 2. pp. 767-781.

Bibtex

@article{235928af30c44b23aa948fa4be8b576d,
title = "Oxygen and neon abundances of planetary nebulae in the elliptical galaxy NGC 4697",
abstract = "This paper presents deep spectra of 14 planetary nebulae (PNs) at a variety of angular distances from the center of the flattened elliptical galaxy NGC 4697, which is located at ~11 Mpc from us. Both near the center and among the most outlying PNs, we have found several examples of very strong [O III] lambda5007, about 20 times brighter than Hbeta. This, together with strong [Ne III] lines, implies a lower limit for O and Ne abundances near solar at the center and also at more than 2 effective radii from the center of NGC 4697. Thus we have found, for the first time from individual stars, direct evidence of the existence of a metal-rich population in elliptical galaxies, confirming metallicities derived from absorption-line indices and extending the information to angular distances where the stellar surface brightness is too low for absorption-line studies. A comparison with abundances obtained closer to the center of NGC 4697 from integrated absorption-line spectra indicates that the metallicity gradient, which is quite steep within 1 effective radius, becomes much less pronounced beyond 1 effective radius. The only alternative to this interpretation would be the presence of a very metal-poor PN population with [Z/H] below -1, which we cannot rule out, but it would require an extremely bimodal metallicity distribution with almost no intermediate metallicities. Part of the data presented herein were obtained at the European Southern Observatory, Chile, Program ESO 69.B-0124. Part of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. ",
keywords = "galaxies : abundances, galaxies : elliptical and lenticular, cD, galaxies : individual (NGC4697), planetary nebulae : general",
author = "Mendez, {R. H.} and D Thomas and Saglia, {R. P.} and C Maraston and Kudritzki, {R. P.} and R. Bender",
year = "2005",
month = jul
day = "10",
language = "English",
volume = "627",
pages = "767--781",
journal = "The Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing",
number = "2",

}

RIS

TY - JOUR

T1 - Oxygen and neon abundances of planetary nebulae in the elliptical galaxy NGC 4697

AU - Mendez, R. H.

AU - Thomas, D

AU - Saglia, R. P.

AU - Maraston, C

AU - Kudritzki, R. P.

AU - Bender, R.

PY - 2005/7/10

Y1 - 2005/7/10

N2 - This paper presents deep spectra of 14 planetary nebulae (PNs) at a variety of angular distances from the center of the flattened elliptical galaxy NGC 4697, which is located at ~11 Mpc from us. Both near the center and among the most outlying PNs, we have found several examples of very strong [O III] lambda5007, about 20 times brighter than Hbeta. This, together with strong [Ne III] lines, implies a lower limit for O and Ne abundances near solar at the center and also at more than 2 effective radii from the center of NGC 4697. Thus we have found, for the first time from individual stars, direct evidence of the existence of a metal-rich population in elliptical galaxies, confirming metallicities derived from absorption-line indices and extending the information to angular distances where the stellar surface brightness is too low for absorption-line studies. A comparison with abundances obtained closer to the center of NGC 4697 from integrated absorption-line spectra indicates that the metallicity gradient, which is quite steep within 1 effective radius, becomes much less pronounced beyond 1 effective radius. The only alternative to this interpretation would be the presence of a very metal-poor PN population with [Z/H] below -1, which we cannot rule out, but it would require an extremely bimodal metallicity distribution with almost no intermediate metallicities. Part of the data presented herein were obtained at the European Southern Observatory, Chile, Program ESO 69.B-0124. Part of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.

AB - This paper presents deep spectra of 14 planetary nebulae (PNs) at a variety of angular distances from the center of the flattened elliptical galaxy NGC 4697, which is located at ~11 Mpc from us. Both near the center and among the most outlying PNs, we have found several examples of very strong [O III] lambda5007, about 20 times brighter than Hbeta. This, together with strong [Ne III] lines, implies a lower limit for O and Ne abundances near solar at the center and also at more than 2 effective radii from the center of NGC 4697. Thus we have found, for the first time from individual stars, direct evidence of the existence of a metal-rich population in elliptical galaxies, confirming metallicities derived from absorption-line indices and extending the information to angular distances where the stellar surface brightness is too low for absorption-line studies. A comparison with abundances obtained closer to the center of NGC 4697 from integrated absorption-line spectra indicates that the metallicity gradient, which is quite steep within 1 effective radius, becomes much less pronounced beyond 1 effective radius. The only alternative to this interpretation would be the presence of a very metal-poor PN population with [Z/H] below -1, which we cannot rule out, but it would require an extremely bimodal metallicity distribution with almost no intermediate metallicities. Part of the data presented herein were obtained at the European Southern Observatory, Chile, Program ESO 69.B-0124. Part of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.

KW - galaxies : abundances

KW - galaxies : elliptical and lenticular, cD

KW - galaxies : individual (NGC4697)

KW - planetary nebulae : general

M3 - Article

VL - 627

SP - 767

EP - 781

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 2

ER -

ID: 1795057