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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2401.02519 |
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| _version_ | 1866929199378333696 |
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| author | Lomelí-Núñez, Luis Mayya, Y. D. Rodríguez-Merino, L. H. Ovando, P. A. Alzate, Jairo A. Rosa-González, D. Cuevas-Otahola, B. Bruzual, Gustavo Cortesi, Arianna Gómez-González, V. M. A Escudero, Carlos G. |
| author_facet | Lomelí-Núñez, Luis Mayya, Y. D. Rodríguez-Merino, L. H. Ovando, P. A. Alzate, Jairo A. Rosa-González, D. Cuevas-Otahola, B. Bruzual, Gustavo Cortesi, Arianna Gómez-González, V. M. A Escudero, Carlos G. |
| contents | We here present the results of an analysis of the optical spectroscopy of 42 globular cluster (GC) candidates in the nearby spiral galaxy M81 (3.61~Mpc). The spectra were obtained using the long-slit and MOS modes of the OSIRIS instrument at the 10.4~m Gran Telescopio Canarias (GTC) at a spectral resolution of $\sim$1000. We used the classical H$β$ vs [MgFe]$'$ index diagram to separate genuine old GCs from clusters younger than 3 Gyr. Of the 30 spectra with continuum signal-to-noise ratio $>10$, we confirm 17 objects to be classical GCs (age $>10$~Gyr, $-1.4<$[Fe/H]$<-$0.4), with the remaining 13 being intermediate-age clusters (1-7.5~Gyr). We combined age and metallicity data of other nearby spiral galaxies ($\lesssim18$~Mpc) obtained using similar methodology like the one we have used here to understand the origin of GCs in spiral galaxies in the cosmological context. We find that the metal-poor ([Fe/H]<$-$1) GCs continued to form up to 6~Gyr after the first GCs were formed, with all younger systems (age $<8$~Gyr) being metal-rich. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_02519 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ages and metallicities of globular clusters in M81 using GTC/OSIRIS spectra Lomelí-Núñez, Luis Mayya, Y. D. Rodríguez-Merino, L. H. Ovando, P. A. Alzate, Jairo A. Rosa-González, D. Cuevas-Otahola, B. Bruzual, Gustavo Cortesi, Arianna Gómez-González, V. M. A Escudero, Carlos G. Astrophysics of Galaxies We here present the results of an analysis of the optical spectroscopy of 42 globular cluster (GC) candidates in the nearby spiral galaxy M81 (3.61~Mpc). The spectra were obtained using the long-slit and MOS modes of the OSIRIS instrument at the 10.4~m Gran Telescopio Canarias (GTC) at a spectral resolution of $\sim$1000. We used the classical H$β$ vs [MgFe]$'$ index diagram to separate genuine old GCs from clusters younger than 3 Gyr. Of the 30 spectra with continuum signal-to-noise ratio $>10$, we confirm 17 objects to be classical GCs (age $>10$~Gyr, $-1.4<$[Fe/H]$<-$0.4), with the remaining 13 being intermediate-age clusters (1-7.5~Gyr). We combined age and metallicity data of other nearby spiral galaxies ($\lesssim18$~Mpc) obtained using similar methodology like the one we have used here to understand the origin of GCs in spiral galaxies in the cosmological context. We find that the metal-poor ([Fe/H]<$-$1) GCs continued to form up to 6~Gyr after the first GCs were formed, with all younger systems (age $<8$~Gyr) being metal-rich. |
| title | Ages and metallicities of globular clusters in M81 using GTC/OSIRIS spectra |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2401.02519 |