ALMA Lensing Cluster Survey: An ALMA Galaxy Signposting a MUSE Galaxy Group at z=4.3 Behind "El Gordo"
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ALMA Lensing Cluster Survey : An ALMA Galaxy Signposting a MUSE Galaxy Group at z=4.3 Behind "El Gordo". / Caputi, K. I.; Caminha, G. B.; Fujimoto, S.; Kohno, K.; Sun, F.; Egami, E.; Deshmukh, S.; Tang, F.; Ao, Y.; Bradley, L.; Coe, D.; Espada, D.; Grillo, C.; Hatsukade, B.; Knudsen, K. K.; Lee, M. M.; Magdis, G. E.; Morokuma-Matsui, K.; Oesch, P.; Ouchi, M.; Rosati, P.; Umehata, H.; Valentino, F.; Vanzella, E.; Wang, W. -H.; Wu, J. F.; Zitrin, A.
In: Astrophysical Journal, Vol. 908, No. 2, 146, 01.02.2021.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - ALMA Lensing Cluster Survey
T2 - An ALMA Galaxy Signposting a MUSE Galaxy Group at z=4.3 Behind "El Gordo"
AU - Caputi, K. I.
AU - Caminha, G. B.
AU - Fujimoto, S.
AU - Kohno, K.
AU - Sun, F.
AU - Egami, E.
AU - Deshmukh, S.
AU - Tang, F.
AU - Ao, Y.
AU - Bradley, L.
AU - Coe, D.
AU - Espada, D.
AU - Grillo, C.
AU - Hatsukade, B.
AU - Knudsen, K. K.
AU - Lee, M. M.
AU - Magdis, G. E.
AU - Morokuma-Matsui, K.
AU - Oesch, P.
AU - Ouchi, M.
AU - Rosati, P.
AU - Umehata, H.
AU - Valentino, F.
AU - Vanzella, E.
AU - Wang, W. -H.
AU - Wu, J. F.
AU - Zitrin, A.
PY - 2021/2/1
Y1 - 2021/2/1
N2 - We report the discovery of a Multi Unit Spectroscopic Explorer (MUSE) galaxy group at z = 4.32 lensed by the massive galaxy cluster ACT-CL J0102-4915 (aka El Gordo) at z = 0.87, associated with a 1.2 mm source that is at a 2.07 0.88 kpc projected distance from one of the group galaxies. Three images of the whole system appear in the image plane. The 1.2 mm source has been detected within the Atacama Large Millimetre/submillimetre Array (ALMA) Lensing Cluster Survey (ALCS). As this ALMA source is undetected at wavelengths lambda <2 mu m, its redshift cannot be independently determined, however, the three lensing components indicate that it belongs to the same galaxy group at z = 4.32. The four members of the MUSE galaxy group have low to intermediate stellar masses (similar to 10(7)-10(10) M) and star formation rates (SFRs) of 0.4-24 M yr(-1), resulting in high specific SFRs (sSFRs) for two of them, which suggest that these galaxies are growing fast (with stellar mass doubling times of only similar to 2 x 10(7) yr). This high incidence of starburst galaxies is likely a consequence of interactions within the galaxy group, which is compact and has high velocity dispersion. Based on the magnification-corrected sub-/millimeter continuum flux density and estimated stellar mass, we infer that the ALMA source is classified as an ordinary ultra-luminous infrared galaxy (with associated dust-obscured SFR similar to 200-300 M yr(-1)) and lies on the star formation main sequence. This reported case of an ALMA/MUSE group association suggests that some presumably isolated ALMA sources are in fact signposts of richer star-forming environments at high redshifts.
AB - We report the discovery of a Multi Unit Spectroscopic Explorer (MUSE) galaxy group at z = 4.32 lensed by the massive galaxy cluster ACT-CL J0102-4915 (aka El Gordo) at z = 0.87, associated with a 1.2 mm source that is at a 2.07 0.88 kpc projected distance from one of the group galaxies. Three images of the whole system appear in the image plane. The 1.2 mm source has been detected within the Atacama Large Millimetre/submillimetre Array (ALMA) Lensing Cluster Survey (ALCS). As this ALMA source is undetected at wavelengths lambda <2 mu m, its redshift cannot be independently determined, however, the three lensing components indicate that it belongs to the same galaxy group at z = 4.32. The four members of the MUSE galaxy group have low to intermediate stellar masses (similar to 10(7)-10(10) M) and star formation rates (SFRs) of 0.4-24 M yr(-1), resulting in high specific SFRs (sSFRs) for two of them, which suggest that these galaxies are growing fast (with stellar mass doubling times of only similar to 2 x 10(7) yr). This high incidence of starburst galaxies is likely a consequence of interactions within the galaxy group, which is compact and has high velocity dispersion. Based on the magnification-corrected sub-/millimeter continuum flux density and estimated stellar mass, we infer that the ALMA source is classified as an ordinary ultra-luminous infrared galaxy (with associated dust-obscured SFR similar to 200-300 M yr(-1)) and lies on the star formation main sequence. This reported case of an ALMA/MUSE group association suggests that some presumably isolated ALMA sources are in fact signposts of richer star-forming environments at high redshifts.
KW - High-redshift galaxies
KW - Starburst galaxies
KW - Galaxy groups
KW - Submillimeter astronomy
U2 - 10.3847/1538-4357/abd4d0
DO - 10.3847/1538-4357/abd4d0
M3 - Journal article
VL - 908
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 146
ER -
ID: 257746572