تقرير
Metallicity and X-ray luminosity variations in NGC 922
| العنوان: | Metallicity and X-ray luminosity variations in NGC 922 |
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| المؤلفون: | Kouroumpatzakis, Konstantinos, Zezas, Andreas, Wolter, Anna, Fruscione, Antonella, Anastasopoulou, Konstantina, Prestwich, Andrea |
| سنة النشر: | 2020 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | We present a systematic study of the metallicity variations within the collisional ring galaxy NGC 922 based on long-slit optical spectroscopic observations. We find a metallicity difference between star-forming regions in the bulge and the ring, with metallicities ranging from almost solar to significantly sub-solar ($\rm{[12+\log(O/H)]\sim 8.2}$). We detect $\rm He\,_I$ emission in the bulge and the ring star-forming regions indicating ionization from massive stars associated with recent ($<10$ Myr) star-formation, in agreement with the presence of very young star-clusters in all studied regions. We find an anti-correlation between the X-ray luminosity and metallicity of the sub-galactic regions of NGC 922. The different regions have similar stellar population ages leaving metallicity as the main driver of the anti-correlation. The dependence of the X-ray emission of the different regions in NGC 922 on metallicity is in agreement with similar studies of the integrated X-ray output of galaxies and predictions from X-ray binary population models. Comment: 15 pages, 10 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/staa3290 |
| URL الوصول: | http://arxiv.org/abs/2010.11107 |
| رقم الأكسشن: | edsarx.2010.11107 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/staa3290 |
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