Exploring the physical properties of lensed star-forming clumps at 2 ≲ z ≲ 6
| العنوان: | Exploring the physical properties of lensed star-forming clumps at 2 ≲ z ≲ 6 |
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| المؤلفون: | U Meštrić, E Vanzella, A Zanella, M Castellano, F Calura, P Rosati, P Bergamini, A Mercurio, M Meneghetti, C Grillo, G B Caminha, M Nonino, E Merlin, G Cupani, E Sani |
| المصدر: | Monthly Notices of the Royal Astronomical Society. 516:3532-3555 |
| بيانات النشر: | Oxford University Press (OUP), 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Space and Planetary Science, Astronomy and Astrophysics |
| الوصف: | We study the physical properties (size, stellar mass, luminosity, star formation rate) and scaling relations for a sample of 166 star-forming clumps with redshift $z \sim 2-6.2$. They are magnified by the Hubble Frontier Field galaxy cluster MACS~J0416 and have robust lensing magnification ($2\lesssim \mu \lesssim 82$) computed by using our high-precision lens model, based on 182 multiple images. Our sample extends by $\sim 3$ times the number of spectroscopically-confirmed lensed clumps at $z \gtrsim 2$. We identify clumps in ultraviolet continuum images and find that, whenever the effective spatial resolution (enhanced by gravitational lensing) increases, they fragment into smaller entities, likely reflecting the hierarchically-organized nature of star formation. Kpc-scale clumps, most commonly observed in field, are not found in our sample. The physical properties of our sample extend the parameter space typically probed by $z \gtrsim 1$ field observations and simulations, by populating the low mass (M$_\star \lesssim 10^7$ M$_\odot$), low star formation rate (SFR $\lesssim 0.5$ M$_\odot$ yr$^{-1}$), and small size (R$_\mathrm{eff} \lesssim 100$ pc) regime. The new domain probed by our study approaches the regime of compact stellar complexes and star clusters. In the mass-size plane, our sample spans the region between galaxies and globular clusters, with a few clumps in the region populated by young star clusters and globular-clusters. For the bulk of our sample, we measure star-formation rates which are higher than those observed locally in compact stellar systems, indicating different conditions for star formation at high redshift than in the local Universe. |
| تدمد: | 1365-2966 0035-8711 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::963b15c631e35dc8c7e6739fb8eb5603 https://doi.org/10.1093/mnras/stac2309 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....963b15c631e35dc8c7e6739fb8eb5603 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13652966 00358711 |
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