Are Wolf-Rayet Stars Able to Pollute the Interstellar Medium of Galaxies? Results from Integral Field Spectroscopy
We investigate the spatial distribution of chemical abundances in a sample of low metallicity Wolf-Rayet (WR) galaxies selected from the SDSS. We used the integral field spectroscopy technique in the optical spectral range (3700 Å–6850 Å) with PMAS attached to the CAHA 3.5 m telescope. Our statistic...
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2013/837392 |
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| author | Enrique Pérez-Montero Carolina Kehrig Jarle Brinchmann José M. Vílchez Daniel Kunth Florence Durret |
| author_facet | Enrique Pérez-Montero Carolina Kehrig Jarle Brinchmann José M. Vílchez Daniel Kunth Florence Durret |
| author_sort | Enrique Pérez-Montero |
| collection | DOAJ |
| description | We investigate the spatial distribution of chemical abundances in a sample of low metallicity Wolf-Rayet (WR) galaxies selected from the SDSS. We used the integral field spectroscopy technique in the optical spectral range (3700 Å–6850 Å) with PMAS attached to the CAHA 3.5 m telescope. Our statistical analysis of the spatial distributions of O/H and N/O, as derived using the direct method or strong-line parameters consistent with it, indicates that metallicity is homogeneous in five out of the six analysed objects in scales of the order of several kpc. Only in the object WR404 is a gradient of metallicity found in the direction of the low surface brightness tail. In contrast, we found an overabundance of N/O in spatial scales of the order of hundreds of pc associated with or close to the positions of the WR stars in 4 out of the 6 galaxies. We exclude possible hydrodynamical causes, such as the metal-poor gas inflow, for this local pollution by means of the analysis of the mass-metallicity relation (MZR) and mass-nitrogen-to-oxygen relation (MNOR) for the WR galaxies catalogued in the SDSS. |
| format | Article |
| id | doaj-art-16a0bcbc6900405fb08fcaddf7e485f6 |
| institution | Kabale University |
| issn | 1687-7969 1687-7977 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Astronomy |
| spelling | doaj-art-16a0bcbc6900405fb08fcaddf7e485f62025-02-03T05:46:54ZengWileyAdvances in Astronomy1687-79691687-79772013-01-01201310.1155/2013/837392837392Are Wolf-Rayet Stars Able to Pollute the Interstellar Medium of Galaxies? Results from Integral Field SpectroscopyEnrique Pérez-Montero0Carolina Kehrig1Jarle Brinchmann2José M. Vílchez3Daniel Kunth4Florence Durret5Instituto de Astrofísica de Andalucía-CSIC, Apartado. 3004, 18008 Granada, SpainInstituto de Astrofísica de Andalucía-CSIC, Apartado. 3004, 18008 Granada, SpainLeiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The NetherlandsInstituto de Astrofísica de Andalucía-CSIC, Apartado. 3004, 18008 Granada, SpainInstitut d’Astrophysique de Paris, UMR 7095 CNRS, Université Pierre & Marie Curie, 98 bis boulevard Arago, 75014 Paris, FranceInstitut d’Astrophysique de Paris, UMR 7095 CNRS, Université Pierre & Marie Curie, 98 bis boulevard Arago, 75014 Paris, FranceWe investigate the spatial distribution of chemical abundances in a sample of low metallicity Wolf-Rayet (WR) galaxies selected from the SDSS. We used the integral field spectroscopy technique in the optical spectral range (3700 Å–6850 Å) with PMAS attached to the CAHA 3.5 m telescope. Our statistical analysis of the spatial distributions of O/H and N/O, as derived using the direct method or strong-line parameters consistent with it, indicates that metallicity is homogeneous in five out of the six analysed objects in scales of the order of several kpc. Only in the object WR404 is a gradient of metallicity found in the direction of the low surface brightness tail. In contrast, we found an overabundance of N/O in spatial scales of the order of hundreds of pc associated with or close to the positions of the WR stars in 4 out of the 6 galaxies. We exclude possible hydrodynamical causes, such as the metal-poor gas inflow, for this local pollution by means of the analysis of the mass-metallicity relation (MZR) and mass-nitrogen-to-oxygen relation (MNOR) for the WR galaxies catalogued in the SDSS.http://dx.doi.org/10.1155/2013/837392 |
| spellingShingle | Enrique Pérez-Montero Carolina Kehrig Jarle Brinchmann José M. Vílchez Daniel Kunth Florence Durret Are Wolf-Rayet Stars Able to Pollute the Interstellar Medium of Galaxies? Results from Integral Field Spectroscopy Advances in Astronomy |
| title | Are Wolf-Rayet Stars Able to Pollute the Interstellar Medium of Galaxies? Results from Integral Field Spectroscopy |
| title_full | Are Wolf-Rayet Stars Able to Pollute the Interstellar Medium of Galaxies? Results from Integral Field Spectroscopy |
| title_fullStr | Are Wolf-Rayet Stars Able to Pollute the Interstellar Medium of Galaxies? Results from Integral Field Spectroscopy |
| title_full_unstemmed | Are Wolf-Rayet Stars Able to Pollute the Interstellar Medium of Galaxies? Results from Integral Field Spectroscopy |
| title_short | Are Wolf-Rayet Stars Able to Pollute the Interstellar Medium of Galaxies? Results from Integral Field Spectroscopy |
| title_sort | are wolf rayet stars able to pollute the interstellar medium of galaxies results from integral field spectroscopy |
| url | http://dx.doi.org/10.1155/2013/837392 |
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