A giant galaxy in the young Universe with a massive ring
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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A giant galaxy in the young Universe with a massive ring. / Yuan, Tiantian; Elagali, Ahmed; Labbe, Ivo; Kacprzak, Glenn G.; Lagos, Claudia del P.; Alcorn, Leo Y.; Cohn, Jonathan H.; Tran, Kim-Vy H.; Glazebrook, Karl; Groves, Brent A.; Freeman, Kenneth C.; Spitler, Lee R.; Straatman, Caroline M. S.; Fisher, Deanne B.; Sweet, Sarah M.
I: Nature Astronomy, Bind 4, Nr. 10, 01.10.2020, s. 957-964.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - A giant galaxy in the young Universe with a massive ring
AU - Yuan, Tiantian
AU - Elagali, Ahmed
AU - Labbe, Ivo
AU - Kacprzak, Glenn G.
AU - Lagos, Claudia del P.
AU - Alcorn, Leo Y.
AU - Cohn, Jonathan H.
AU - Tran, Kim-Vy H.
AU - Glazebrook, Karl
AU - Groves, Brent A.
AU - Freeman, Kenneth C.
AU - Spitler, Lee R.
AU - Straatman, Caroline M. S.
AU - Fisher, Deanne B.
AU - Sweet, Sarah M.
PY - 2020/10/1
Y1 - 2020/10/1
N2 - In the local (redshift z approximate to 0) Universe, collisional ring galaxies make up only similar to 0.01% of galaxies(1) and are formed by head-on galactic collisions that trigger radially propagating density waves(2-4). These striking systems provide key snapshots for dissecting galactic disks and are studied extensively in the local Universe(5-9). However, not much is known about distant (z > 0.1) collisional rings(10-14). Here we present a detailed study of a ring galaxy at a look-back time of 10.8 Gyr (z = 2.19). Compared with our Milky Way, this galaxy has a similar stellar mass, but has a stellar half-light radius that is 1.5-2.2 times larger and is forming stars 50 times faster. The extended, diffuse stellar light outside the star-forming ring, combined with a radial velocity on the ring and an intruder galaxy nearby, provides evidence for this galaxy hosting a collisional ring. If the ring is secularly evolved(15,16), the implied large bar in a giant disk would be inconsistent with the current understanding of the earliest formation of barred spirals(17-21). Contrary to previous predictions(10-12), this work suggests that massive collisional rings were as rare 11 Gyr ago as they are today. Our discovery offers a unique pathway for studying density waves in young galaxies, as well as constraining the cosmic evolution of spiral disks and galaxy groups.
AB - In the local (redshift z approximate to 0) Universe, collisional ring galaxies make up only similar to 0.01% of galaxies(1) and are formed by head-on galactic collisions that trigger radially propagating density waves(2-4). These striking systems provide key snapshots for dissecting galactic disks and are studied extensively in the local Universe(5-9). However, not much is known about distant (z > 0.1) collisional rings(10-14). Here we present a detailed study of a ring galaxy at a look-back time of 10.8 Gyr (z = 2.19). Compared with our Milky Way, this galaxy has a similar stellar mass, but has a stellar half-light radius that is 1.5-2.2 times larger and is forming stars 50 times faster. The extended, diffuse stellar light outside the star-forming ring, combined with a radial velocity on the ring and an intruder galaxy nearby, provides evidence for this galaxy hosting a collisional ring. If the ring is secularly evolved(15,16), the implied large bar in a giant disk would be inconsistent with the current understanding of the earliest formation of barred spirals(17-21). Contrary to previous predictions(10-12), this work suggests that massive collisional rings were as rare 11 Gyr ago as they are today. Our discovery offers a unique pathway for studying density waves in young galaxies, as well as constraining the cosmic evolution of spiral disks and galaxy groups.
KW - FORMATION RATES
KW - STAR-FORMATION
KW - STELLAR
KW - CATALOG
KW - WHEELS
KW - MASSES
KW - MILKY
KW - FIRE
U2 - 10.1038/s41550-020-1102-7
DO - 10.1038/s41550-020-1102-7
M3 - Journal article
VL - 4
SP - 957
EP - 964
JO - Nature Astronomy
JF - Nature Astronomy
SN - 2397-3366
IS - 10
ER -
ID: 258028434