Chemical and Photometric Evolution of Extended Ultraviolet Disks: Optical Spectroscopy of M83 (NGC 5236) and NGC 4625 | Zendy

A. Gil de Paz | Zendy; Barry F. Madore | Zendy; S. Boissier | Zendy; David A. Thilker | Zendy; L. Bianchi | Zendy; C. Sánchez Contreras | Zendy; Tom A. Barlow | Zendy; T. Conrow | Zendy; Karl Förster | Zendy; Peter G. Friedman | Zendy; D. Christopher Martin | Zendy; Patrick Morrissey | Zendy; Susan G. Neff | Zendy; R. Michael Rich | Zendy; David Schiminovich | Zendy; Mark Seibert | Zendy; Todd Small | Zendy; Jose Donas | Zendy; Timothy M. Heckman | Zendy; YoungWook Lee | Zendy; Bruno Milliard | Zendy; Alexander S. Szalay | Zendy; Ted K. Wyder | Zendy; Sukyoung K. Yi | Zendy

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Chemical and Photometric Evolution of Extended Ultraviolet Disks: Optical Spectroscopy of M83 (NGC 5236) and NGC 4625

Author(s) -

A. Gil de Paz,

Barry F. Madore,

S. Boissier,

David A. Thilker,

L. Bianchi,

C. Sánchez Contreras,

Tom A. Barlow,

T. Conrow,

Karl Förster,

Peter G. Friedman,

D. Christopher Martin,

Patrick Morrissey,

Susan G. Neff,

R. Michael Rich,

David Schiminovich,

Mark Seibert,

Todd Small,

Jose Donas,

Timothy M. Heckman,

YoungWook Lee,

Bruno Milliard,

Alexander S. Szalay,

Ted K. Wyder,

Sukyoung K. Yi

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/513730

Subject(s) - physics , astrophysics , stars , line (geometry) , astronomy , spectral line , photoionization , spectroscopy , observatory , ultraviolet , galaxy , ionization , optics , ion , geometry , mathematics , quantum mechanics

We present the results from the analysis of optical spectra of 31Halpha-selected regions in the extended UV (XUV) disks of M83 (NGC5236) andNGC4625 recently discovered by GALEX. The spectra were obtained using IMACS atLas Campanas Observatory 6.5m Magellan I telescope and COSMIC at the Palomar200-inch telescope, respectively for M83 and NGC4625. The line ratios measuredindicate nebular oxygen abundances (derived from the R23 parameter) of theorder of Zsun/5-Zsun/10. For most emission-line regions analyzed the linefluxes and ratios measured are best reproduced by models of photoionization bysingle stars with masses in the range 20-40 Msun and oxygen abundancescomparable to those derived from the R23 parameter. We find indications for arelatively high N/O abundance ratio in the XUV disk of M83. Although themetallicities derived imply that these are not the first stars formed in theXUV disks, such a level of enrichment could be reached in young spiral disksonly 1 Gyr after these first stars would have formed. The amount of gas in theXUV disks allow maintaining the current level of star formation for at least afew Gyr.Comment: 52 pages, 8 tables, 7 figures, accepted for publication in Ap

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