Early Results from GLASS-JWST. VII. Evidence for Lensed, Gravitationally Bound Protoglobular Clusters at z=4 in the Hubble Frontier Field A2744*
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Early Results from GLASS-JWST. VII. Evidence for Lensed, Gravitationally Bound Protoglobular Clusters at z=4 in the Hubble Frontier Field A2744*. / Vanzella, E.; Castellano, M.; Bergamini, P.; Treu, T.; Mercurio, A.; Scarlata, C.; Rosati, P.; Grillo, C.; Acebron, A.; Caminha, G. B.; Nonino, M.; Nanayakkara, T.; Roberts-Borsani, G.; Bradac, M.; Wang, X.; Brammer, G.; Strait, James B; Vulcani, B.; Mestric, U.; Meneghetti, M.; Calura, F.; Henry, Alaina; Zanella, A.; Trenti, M.; Boyett, K.; Morishita, T.; Calabro, A.; Glazebrook, K.; Marchesini, D.; Birrer, S.; Yang, L.; Jones, T.
In: Astrophysical Journal Letters, Vol. 940, No. 2, 53, 01.12.2022.Research output: Contribution to journal › Letter › Research › peer-review
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TY - JOUR
T1 - Early Results from GLASS-JWST. VII. Evidence for Lensed, Gravitationally Bound Protoglobular Clusters at z=4 in the Hubble Frontier Field A2744*
AU - Vanzella, E.
AU - Castellano, M.
AU - Bergamini, P.
AU - Treu, T.
AU - Mercurio, A.
AU - Scarlata, C.
AU - Rosati, P.
AU - Grillo, C.
AU - Acebron, A.
AU - Caminha, G. B.
AU - Nonino, M.
AU - Nanayakkara, T.
AU - Roberts-Borsani, G.
AU - Bradac, M.
AU - Wang, X.
AU - Brammer, G.
AU - Strait, James B
AU - Vulcani, B.
AU - Mestric, U.
AU - Meneghetti, M.
AU - Calura, F.
AU - Henry, Alaina
AU - Zanella, A.
AU - Trenti, M.
AU - Boyett, K.
AU - Morishita, T.
AU - Calabro, A.
AU - Glazebrook, K.
AU - Marchesini, D.
AU - Birrer, S.
AU - Yang, L.
AU - Jones, T.
PY - 2022/12/1
Y1 - 2022/12/1
N2 - We investigate the blue and optical rest-frame sizes (lambda similar or equal to 2300-4000 angstrom) of three compact star-forming regions in a galaxy at z = 4 strongly lensed (x30, x45, and x100) by the Hubble Frontier Field galaxy cluster A2744 using GLASS-ERS James Webb Space Telescope (JWST)/NIRISS imaging at 1.15 mu m, 1.50 mu m, and 2.0 mu m with a point-spread function less than or similar to 0.'' 1. In particular, the Balmer break is probed in detail for all multiply imaged sources of the system. With ages of a few tens of Myr, stellar masses in the range (0.7-4.0) x10(6) M (circle dot) and optical/ultraviolet effective radii spanning the interval 3 < R ( eff ) < 20 pc, such objects are currently the highest-redshift (spectroscopically confirmed) gravitationally bound young massive star clusters (YMCs), with stellar mass surface densities resembling those of local globular clusters. Optical (4000 angstrom, JWST-based) and ultraviolet (1600 angstrom, Hubble Space Telescope-based) sizes are fully compatible. The contribution to the ultraviolet underlying continuum emission (1600 angstrom) is similar to 30%, which decreases by a factor of 2 in the optical for two of the YMCs (similar to 4000 angstrom rest-frame), reflecting the young ages (
AB - We investigate the blue and optical rest-frame sizes (lambda similar or equal to 2300-4000 angstrom) of three compact star-forming regions in a galaxy at z = 4 strongly lensed (x30, x45, and x100) by the Hubble Frontier Field galaxy cluster A2744 using GLASS-ERS James Webb Space Telescope (JWST)/NIRISS imaging at 1.15 mu m, 1.50 mu m, and 2.0 mu m with a point-spread function less than or similar to 0.'' 1. In particular, the Balmer break is probed in detail for all multiply imaged sources of the system. With ages of a few tens of Myr, stellar masses in the range (0.7-4.0) x10(6) M (circle dot) and optical/ultraviolet effective radii spanning the interval 3 < R ( eff ) < 20 pc, such objects are currently the highest-redshift (spectroscopically confirmed) gravitationally bound young massive star clusters (YMCs), with stellar mass surface densities resembling those of local globular clusters. Optical (4000 angstrom, JWST-based) and ultraviolet (1600 angstrom, Hubble Space Telescope-based) sizes are fully compatible. The contribution to the ultraviolet underlying continuum emission (1600 angstrom) is similar to 30%, which decreases by a factor of 2 in the optical for two of the YMCs (similar to 4000 angstrom rest-frame), reflecting the young ages (
KW - STAR-FORMING CLUMPS
KW - GALAXIES
KW - II.
KW - ABELL-2744
KW - RESOLUTION
KW - EVOLUTION
U2 - 10.3847/2041-8213/ac8c2d
DO - 10.3847/2041-8213/ac8c2d
M3 - Letter
VL - 940
JO - The Astrophysical Journal Letters
JF - The Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - 53
ER -
ID: 332119702