Chemical and photometric evolution of extended ultraviolet disks: Optical spectroscopy of M83 (NGC 5236) and NGC 4625

Armando Gil De Paz; Barry F. Madore; Samuel Boissier; David Thilker; Luciana Bianchi; Carmen Sánchez Contreras; Tom A. Barlow; Tim Conrow; Karl Forster; Peter G. Friedman; D. Christopher Martin; Patrick Morrissey; Susan G. Neff; R. Michael Rich; David Schiminovich; Mark Seibert; Todd Small; José Donas; Timothy M. Heckman; Young Wook Lee; Bruno Milliard; Alex S. Szalay; Ted K. Wyder; Sukyoung Yi

doi:10.1086/513730

Chemical and photometric evolution of extended ultraviolet disks: Optical spectroscopy of M83 (NGC 5236) and NGC 4625

Armando Gil De Paz, Barry F. Madore, Samuel Boissier, David Thilker, Luciana Bianchi, Carmen Sánchez Contreras, Tom A. Barlow, Tim Conrow, Karl Forster, Peter G. Friedman, D. Christopher Martin, Patrick Morrissey, Susan G. Neff, R. Michael Rich, David Schiminovich, Mark Seibert, Todd Small, José Donas, Timothy M. Heckman, Young Wook LeeBruno Milliard, Alex S. Szalay, Ted K. Wyder, Sukyoung Yi

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Abstract

We present the results from the analysis of optical spectra of 31 Hα-selected regions in the extended UV (XUV) disks of M83 (NGC 5236) and NGC 4625 recently discovered by GALEX. The spectra were obtained using IMACS at the Las Campanas Observatory 6.5 m Magellan I telescope and COSMIC at the Palomar 200 inch (5 m) telescope, respectively, for M83 and NGC 4625. The line ratios measured indicate nebular oxygen abundances (derived from the R23 parameter) of the order of Z⊙/5-Z⊙/10. For most emission-line regions analyzed the line fluxes and ratios measured are best reproduced by models of photoionization by single stars with masses in the range 20-40 M⊙ and oxygen abundances comparable to those derived from the R23 parameter. We find indications for a relatively high N/O abundance ratio in the XUV disk of M83. Although the metallicities derived imply that these are not the first stars formed in the XUV disks, such a level of enrichment could be reached in young spiral disks only 1 Gyr after these first stars would have formed. The amount of gas in the XUV disks allows maintaining the current level of star formation for at least a few Gyr.

Original language	English
Pages (from-to)	115-134
Number of pages	20
Journal	Astrophysical Journal
Volume	661
Issue number	1 I
DOIs	https://doi.org/10.1086/513730
Publication status	Published - 2007 May 20

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/513730

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Gil De Paz, A., Madore, B. F., Boissier, S., Thilker, D., Bianchi, L., Contreras, C. S., Barlow, T. A., Conrow, T., Forster, K., Friedman, P. G., Martin, D. C., Morrissey, P., Neff, S. G., Rich, R. M., Schiminovich, D., Seibert, M., Small, T., Donas, J., Heckman, T. M., ... Yi, S. (2007). Chemical and photometric evolution of extended ultraviolet disks: Optical spectroscopy of M83 (NGC 5236) and NGC 4625. Astrophysical Journal, 661(1 I), 115-134. https://doi.org/10.1086/513730

@article{5e1f12ea9ca14e7cbed22ceed3a680fe,

title = "Chemical and photometric evolution of extended ultraviolet disks: Optical spectroscopy of M83 (NGC 5236) and NGC 4625",

abstract = "We present the results from the analysis of optical spectra of 31 Hα-selected regions in the extended UV (XUV) disks of M83 (NGC 5236) and NGC 4625 recently discovered by GALEX. The spectra were obtained using IMACS at the Las Campanas Observatory 6.5 m Magellan I telescope and COSMIC at the Palomar 200 inch (5 m) telescope, respectively, for M83 and NGC 4625. The line ratios measured indicate nebular oxygen abundances (derived from the R23 parameter) of the order of Z⊙/5-Z⊙/10. For most emission-line regions analyzed the line fluxes and ratios measured are best reproduced by models of photoionization by single stars with masses in the range 20-40 M⊙ and oxygen abundances comparable to those derived from the R23 parameter. We find indications for a relatively high N/O abundance ratio in the XUV disk of M83. Although the metallicities derived imply that these are not the first stars formed in the XUV disks, such a level of enrichment could be reached in young spiral disks only 1 Gyr after these first stars would have formed. The amount of gas in the XUV disks allows maintaining the current level of star formation for at least a few Gyr.",

author = "{Gil De Paz}, Armando and Madore, {Barry F.} and Samuel Boissier and David Thilker and Luciana Bianchi and Contreras, {Carmen S{\'a}nchez} and Barlow, {Tom A.} and Tim Conrow and Karl Forster and Friedman, {Peter G.} and Martin, {D. Christopher} and Patrick Morrissey and Neff, {Susan G.} and Rich, {R. Michael} and David Schiminovich and Mark Seibert and Todd Small and Jos{\'e} Donas and Heckman, {Timothy M.} and Lee, {Young Wook} and Bruno Milliard and Szalay, {Alex S.} and Wyder, {Ted K.} and Sukyoung Yi",

year = "2007",

month = may,

day = "20",

doi = "10.1086/513730",

language = "English",

volume = "661",

pages = "115--134",

journal = "Astrophysical Journal",

issn = "0004-637X",

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Gil De Paz, A, Madore, BF, Boissier, S, Thilker, D, Bianchi, L, Contreras, CS, Barlow, TA, Conrow, T, Forster, K, Friedman, PG, Martin, DC, Morrissey, P, Neff, SG, Rich, RM, Schiminovich, D, Seibert, M, Small, T, Donas, J, Heckman, TM, Lee, YW, Milliard, B, Szalay, AS, Wyder, TK & Yi, S 2007, 'Chemical and photometric evolution of extended ultraviolet disks: Optical spectroscopy of M83 (NGC 5236) and NGC 4625', Astrophysical Journal, vol. 661, no. 1 I, pp. 115-134. https://doi.org/10.1086/513730

TY - JOUR

T1 - Chemical and photometric evolution of extended ultraviolet disks

T2 - Optical spectroscopy of M83 (NGC 5236) and NGC 4625

AU - Gil De Paz, Armando

AU - Madore, Barry F.

AU - Boissier, Samuel

AU - Thilker, David

AU - Bianchi, Luciana

AU - Contreras, Carmen Sánchez

AU - Barlow, Tom A.

AU - Conrow, Tim

AU - Forster, Karl

AU - Friedman, Peter G.

AU - Martin, D. Christopher

AU - Morrissey, Patrick

AU - Neff, Susan G.

AU - Rich, R. Michael

AU - Schiminovich, David

AU - Seibert, Mark

AU - Small, Todd

AU - Donas, José

AU - Heckman, Timothy M.

AU - Lee, Young Wook

AU - Milliard, Bruno

AU - Szalay, Alex S.

AU - Wyder, Ted K.

AU - Yi, Sukyoung

PY - 2007/5/20

Y1 - 2007/5/20

N2 - We present the results from the analysis of optical spectra of 31 Hα-selected regions in the extended UV (XUV) disks of M83 (NGC 5236) and NGC 4625 recently discovered by GALEX. The spectra were obtained using IMACS at the Las Campanas Observatory 6.5 m Magellan I telescope and COSMIC at the Palomar 200 inch (5 m) telescope, respectively, for M83 and NGC 4625. The line ratios measured indicate nebular oxygen abundances (derived from the R23 parameter) of the order of Z⊙/5-Z⊙/10. For most emission-line regions analyzed the line fluxes and ratios measured are best reproduced by models of photoionization by single stars with masses in the range 20-40 M⊙ and oxygen abundances comparable to those derived from the R23 parameter. We find indications for a relatively high N/O abundance ratio in the XUV disk of M83. Although the metallicities derived imply that these are not the first stars formed in the XUV disks, such a level of enrichment could be reached in young spiral disks only 1 Gyr after these first stars would have formed. The amount of gas in the XUV disks allows maintaining the current level of star formation for at least a few Gyr.

AB - We present the results from the analysis of optical spectra of 31 Hα-selected regions in the extended UV (XUV) disks of M83 (NGC 5236) and NGC 4625 recently discovered by GALEX. The spectra were obtained using IMACS at the Las Campanas Observatory 6.5 m Magellan I telescope and COSMIC at the Palomar 200 inch (5 m) telescope, respectively, for M83 and NGC 4625. The line ratios measured indicate nebular oxygen abundances (derived from the R23 parameter) of the order of Z⊙/5-Z⊙/10. For most emission-line regions analyzed the line fluxes and ratios measured are best reproduced by models of photoionization by single stars with masses in the range 20-40 M⊙ and oxygen abundances comparable to those derived from the R23 parameter. We find indications for a relatively high N/O abundance ratio in the XUV disk of M83. Although the metallicities derived imply that these are not the first stars formed in the XUV disks, such a level of enrichment could be reached in young spiral disks only 1 Gyr after these first stars would have formed. The amount of gas in the XUV disks allows maintaining the current level of star formation for at least a few Gyr.

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U2 - 10.1086/513730

DO - 10.1086/513730

M3 - Article

AN - SCOPUS:34250005457

SN - 0004-637X

VL - 661

SP - 115

EP - 134

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 I

ER -

Chemical and photometric evolution of extended ultraviolet disks: Optical spectroscopy of M83 (NGC 5236) and NGC 4625

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