Metal-THINGS: on the metallicity and ionization of ULX sources in NGC 925
We present an analysis of the optical properties of three Ultra Luminous X-ray (ULX) sources identified in NGC 925. We use Integral field unit data from the George Mitchel spectrograph in the context of the Metal-THINGS survey. The optical properties for ULX-1 and ULX-3 are presented, while the spax...
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| Hauptverfasser: | , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2021 January 5
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| In: |
The astrophysical journal
Year: 2021, Jahrgang: 906, Heft: 1 |
| ISSN: | 1538-4357 |
| DOI: | 10.3847/1538-4357/abc892 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3847/1538-4357/abc892
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| Verfasserangaben: | Maritza A. Lara-López, Igor A. Zinchenko, Leonid S. Pilyugin, Madusha L.P. Gunawardhana, Omar López-Cruz, Shane P. O' Sullivan, Anna Feltre, Margarita Rosado, Mónica Sánchez-Cruces, Jacopo Chevallard, Maria Emilia De Rossi, Sami Dib, Jacopo Fritz, Isaura Fuentes-Carrera, Luis E. Garduño, and Eduardo Ibar |
MARC
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| 100 | 1 | |a Lara-López, Maritza A. |e VerfasserIn |0 (DE-588)1205161805 |0 (DE-627)1690568178 |4 aut | |
| 245 | 1 | 0 | |a Metal-THINGS |b on the metallicity and ionization of ULX sources in NGC 925 |c Maritza A. Lara-López, Igor A. Zinchenko, Leonid S. Pilyugin, Madusha L.P. Gunawardhana, Omar López-Cruz, Shane P. O' Sullivan, Anna Feltre, Margarita Rosado, Mónica Sánchez-Cruces, Jacopo Chevallard, Maria Emilia De Rossi, Sami Dib, Jacopo Fritz, Isaura Fuentes-Carrera, Luis E. Garduño, and Eduardo Ibar |
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| 520 | |a We present an analysis of the optical properties of three Ultra Luminous X-ray (ULX) sources identified in NGC 925. We use Integral field unit data from the George Mitchel spectrograph in the context of the Metal-THINGS survey. The optical properties for ULX-1 and ULX-3 are presented, while the spaxel associated with ULX-2 had a low S/N, which prevented its analysis. We also report the kinematics and dimensions of the optical nebula associated with each ULX using ancillary data from the PUMA Fabry-Perot spectrograph. A BPT analysis demonstrates that most spaxels in NGC 925 are dominated by star-forming regions, including those associated with ULX-1 and ULX-3. Using the resolved gas-phase metallicities, a negative metallicity gradient is found, consistent with previous results for spiral galaxies, while the ionization parameter tends to increase radially throughout the galaxy. Interestingly, ULX-1 shows a very low gas metallicity for its galactocentric distance, identified by two independent methods, while exhibiting a typical ionization. We find that such low gas metallicity is best explained in the context of the high-mass X-ray binary population, where the low-metallicity environment favors active Roche lobe overflows that can drive much higher accretion rates. An alternative scenario invoking accretion of a low-mass galaxy is not supported by the data in this region. Finally, ULX-3 shows both a high metallicity and ionization parameter, which is consistent with the progenitor being a highly accreting neutron star within an evolved stellar population region. | ||
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