مورد إلكتروني
High star cluster formation efficiency in the strongly lensed Sunburst Lyman-continuum galaxy at z=2.37
| العنوان: | High star cluster formation efficiency in the strongly lensed Sunburst Lyman-continuum galaxy at z=2.37 |
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| المصدر: | Vanzella , E , Castellano , M , Bergamini , P , Meneghetti , M , Zanella , A , Calura , F , Caminha , G B , Rosati , P , Cupani , G , Mestric , U , Brammer , G , Tozzi , P , Mercurio , A , Grillo , C , Sani , E , Cristiani , S , Nonino , M , Merlin , E & Pignataro , G 2022 , ' High star cluster formation efficiency in the strongly lensed Sunburst Lyman-continuum galaxy at z=2.37 ' , Astronomy & Astrophysics , vol. 659 , A2 . |
| بيانات النشر: | 2022-02-25 |
| تفاصيل مُضافة: | Vanzella, E. Castellano, M. Bergamini, P. Meneghetti, M. Zanella, A. Calura, F. Caminha, G. B. Rosati, P. Cupani, G. Mestric, U. Brammer, G. Tozzi, P. Mercurio, A. Grillo, C. Sani, E. Cristiani, S. Nonino, M. Merlin, E. Pignataro, G. |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | We investigate the strongly lensed (mu similar or equal to x10-100) Lyman continuum (LyC) galaxy, dubbed Sunburst, at z = 2.37, taking advantage of a new accurate model of the lens. A characterization of the intrinsic (delensed) properties of the system yields a size of similar or equal to 3 sq. kpc, a luminosity of M-UV = -20.3, and a stellar mass of M similar or equal to 10(9) M-circle dot; 16% of the ultraviolet light is located in a 3 Myr old gravitationally bound young massive star cluster (YMC), with an effective radius of similar to 8 pc (corresponding to 1 milliarcsec without lensing) and a dynamical mass of -107 M. (similar to the stellar mass) - from which LyC radiation is detected (lambda < 912 angstrom). The star formation rate and stellar mass surface densities for the YMC are Log(10)(Sigma(SFR)[M(circle dot)yr(-1) kpc(-2)]) similar or equal to 3.7 and Log(10)(Sigma(M)[M-circle dot pc(-2)]) similar or equal to 4.1, with sSFR > 330 Gyr(-1), consistent with the values observed in local young massive star clusters. The inferred outflowing gas velocity (>300 km s(-1)) exceeds the escape velocity of the cluster. The resulting relative escape fraction of the ionizing radiation emerging from the entire galaxy is higher than 6-12%, whilst it is greater than or similar to 46-93% if inferred from the YMC multiple line of sights. At least 12 additional unresolved star-forming knots with radii spanning the interval 3-20 pc (the majority of them likely gravitationally bound star clusters) are identified in the galaxy. A significant fraction (40-60%) of the ultraviolet light of the entire galaxy is located in such bound star clusters. In adopting a formation timescale of the star clusters of 20 Myr, a cluster formation efficiency Gamma greater than or similar to 30%. The star formation rate surface density of the Sunburst galaxy (Log(10)(Sigma(SFR)) = 0.5(-0.2)(+0.3)) is consistent with the high inferred Gamma, as observed in . local galaxies experiencing |
| مصطلحات الفهرس: | galaxies: high-redshift, galaxies: individual: Sunburst galaxy, galaxies: star formation, galaxies: ISM, galaxies: star clusters: general, gravitational lensing: strong, HIGH-REDSHIFT GALAXIES, MEAN FREE-PATH, PHOTOMETRIC REDSHIFTS, FORMING CLUMPS, PHYSICAL-PROPERTIES, LUMINOSITY FUNCTION, MAGELLAN EVOLUTION, DYNAMICAL MASSES, IONIZING PHOTONS, ESCAPE FRACTION, article |
| URL: | |
| الإتاحة: | Open access content. Open access content info:eu-repo/semantics/openAccess |
| ملاحظة: | application/pdf English |
| أرقام أخرى: | DAV oai:pure.atira.dk:publications/cd9c96bc-35ec-42ee-9099-3010a051a56b 1340141837 |
| المصدر المساهم: | UNIV OF COPENHAGEN From OAIster®, provided by the OCLC Cooperative. |
| رقم الأكسشن: | edsoai.on1340141837 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |