EMPRESS. III. Morphology, Stellar Population, and Dynamics of Extremely Metal-poor Galaxies (EMPGs): Are EMPGs Local Analogs of High-z Young Galaxies?
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EMPRESS. III. Morphology, Stellar Population, and Dynamics of Extremely Metal-poor Galaxies (EMPGs) : Are EMPGs Local Analogs of High-z Young Galaxies? / Isobe, Yuki; Ouchi, Masami; Kojima, Takashi; Shibuya, Takatoshi; Hayashi, Kohei; Rauch, Michael; Kikuchihara, Shotaro; Zhang, Haibin; Ono, Yoshiaki; Fujimoto, Seiji; Harikane, Yuichi; Kim, Ji Hoon; Komiyama, Yutaka; Kusakabe, Haruka; Lee, Chien-Hsiu; Mawatari, Ken; Onodera, Masato; Sugahara, Yuma; Yabe, Kiyoto.
I: Astrophysical Journal, Bind 918, Nr. 2, 54, 07.09.2021.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - EMPRESS. III. Morphology, Stellar Population, and Dynamics of Extremely Metal-poor Galaxies (EMPGs)
T2 - Are EMPGs Local Analogs of High-z Young Galaxies?
AU - Isobe, Yuki
AU - Ouchi, Masami
AU - Kojima, Takashi
AU - Shibuya, Takatoshi
AU - Hayashi, Kohei
AU - Rauch, Michael
AU - Kikuchihara, Shotaro
AU - Zhang, Haibin
AU - Ono, Yoshiaki
AU - Fujimoto, Seiji
AU - Harikane, Yuichi
AU - Kim, Ji Hoon
AU - Komiyama, Yutaka
AU - Kusakabe, Haruka
AU - Lee, Chien-Hsiu
AU - Mawatari, Ken
AU - Onodera, Masato
AU - Sugahara, Yuma
AU - Yabe, Kiyoto
PY - 2021/9/7
Y1 - 2021/9/7
N2 - We present the morphology and stellar population of 27 extremely metal-poor galaxies (EMPGs) at z similar to 0 with metallicities of 0.01-0.1 Z(circle dot). We conduct multicomponent surface brightness (SB) profile fitting for the deep Subaru/Hyper Suprime-Cam i-band images of the EMPGs with the Galfit software, carefully removing the SB contributions of tails. We find that the EMPGs with a median stellar mass of log(M-*/M-circle dot)=6.0 n = 1.1 and a median effective radius of r (e) = 200 pc, suggesting that typical EMPGs have a very compact disk. We compare the EMPGs with z similar to 6 galaxies and local galaxies on the size-mass (r(e) -M-*) diagram, and identify that the majority of the EMPGs have an r (e) -M-* relation similar to z similar to 0 star-forming galaxies rather than z similar to 6 galaxies. Not every EMPG is a local analog of high-z young galaxies in the r(e) -M-* relation. A spectrum of one pair of EMPG and tail, so far available, indicates that the tail is dynamically related to the EMPG with a median velocity difference of Delta V = 101 +/- 32 km s(-1). This moderately large Delta V cannot be explained by the dynamics of the tail, but likely by the infall on the tail. For the first time, we may identify the metal-poor star-forming system just now infalling into the tail.
AB - We present the morphology and stellar population of 27 extremely metal-poor galaxies (EMPGs) at z similar to 0 with metallicities of 0.01-0.1 Z(circle dot). We conduct multicomponent surface brightness (SB) profile fitting for the deep Subaru/Hyper Suprime-Cam i-band images of the EMPGs with the Galfit software, carefully removing the SB contributions of tails. We find that the EMPGs with a median stellar mass of log(M-*/M-circle dot)=6.0 n = 1.1 and a median effective radius of r (e) = 200 pc, suggesting that typical EMPGs have a very compact disk. We compare the EMPGs with z similar to 6 galaxies and local galaxies on the size-mass (r(e) -M-*) diagram, and identify that the majority of the EMPGs have an r (e) -M-* relation similar to z similar to 0 star-forming galaxies rather than z similar to 6 galaxies. Not every EMPG is a local analog of high-z young galaxies in the r(e) -M-* relation. A spectrum of one pair of EMPG and tail, so far available, indicates that the tail is dynamically related to the EMPG with a median velocity difference of Delta V = 101 +/- 32 km s(-1). This moderately large Delta V cannot be explained by the dynamics of the tail, but likely by the infall on the tail. For the first time, we may identify the metal-poor star-forming system just now infalling into the tail.
KW - STAR-FORMING GALAXIES
KW - LOW-MASS GALAXIES
KW - PHYSICAL-PROPERTIES
KW - REIONIZATION-ERA
KW - CLUSTER
KW - DISCOVERY
KW - ABUNDANCE
KW - EMISSION
KW - RELEASE
KW - I.
U2 - 10.3847/1538-4357/ac05bf
DO - 10.3847/1538-4357/ac05bf
M3 - Journal article
VL - 918
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 54
ER -
ID: 279823647