2023A&A...673L...6C

Query : 2023A&A...673L...6C

2023A&A...673L...6C - Astronomy and Astrophysics, volume 673L6 (2023/5-1)

Uncovering the stellar structure of the dusty star-forming galaxy GN20 at z = 4.055 with MIRI/JWST.

COLINA L., CRESPO GOMEZ A., ALVAREZ-MARQUEZ J., BIK A., WALTER F., BOOGAARD L., LABIANO A., PEISSKER F., PEREZ-GONZALEZ P., OSTLIN G., GREVE T.R., NORGAARD-NIELSEN H.U., WRIGHT G., ALONSO-HERRERO A., AZOLLINI R., CAPUTI K.I., DICKEN D., GARCIA-MARIN M., HJORTH J., ILBERT O., KENDREW S., PYE J.P., TIKKANEN T., VAN DER WERF P., COSTANTIN L., IANI E., GILLMAN S., JERMANN I., LANGEROODI D., MOUTARD T., RINALDI P., TOPINKA M., VAN DISHOECK E.F., GUDEL M., HENNING T., LAGAGE P.O., RAY T. and VANDENBUSSCHE B.

Abstract (from CDS):

Luminous infrared galaxies at high redshifts (z > 4) include extreme starbursts that build their stellar mass over short periods of time, that is, of 100 Myr or less. These galaxies are considered to be the progenitors of massive quiescent galaxies at intermediate redshifts (z ∼ 2) but their stellar structure and buildup is unknown. Here, we present the first spatially resolved near-infrared (rest-frame 1.1 μm) imaging of GN20, one of the most luminous dusty star-forming galaxies known to date, observed at an epoch when the Universe was only 1.5 Gyr old. The 5.6 μm image taken with the JWST Mid-Infrared Instrument (MIRI/JWST) shows that GN20 is a very luminous galaxy (M_1.1 μm, AB_ = -25.01, uncorrected for internal extinction), with a stellar structure composed of a conspicuous central source and an extended envelope. The central source is an unresolved nucleus that carries 9% of the total flux. The nucleus is co-aligned with the peak of the cold dust emission, and offset by 3.9 kpc from the ultraviolet stellar emission. The diffuse stellar envelope is similar in size (3.6 kpc effective radius) to the clumpy CO molecular gas distribution. The centroid of the stellar envelope is offset by 1 kpc from the unresolved nucleus, suggesting GN20 is involved in an interaction or merger event supported by its location as the brightest galaxy in a proto-cluster. Additional faint stellar clumps appear to be associated with some of the UV- and CO-clumps. The stellar size of GN20 is larger by a factor of about 3 to 5 than known spheroids, disks, and irregulars at z ∼ 4, while its size and low Sérsic index are similar to those measured in dusty, infrared luminous galaxies at redshift 2 of the same mass (∼1011 M⊙). GN20 has all the ingredients necessary for evolving into a massive spheroidal quiescent galaxy at intermediate redshift: it is a large, luminous galaxy at z = 4.05 involved in a short and massive starburst centred in the stellar nucleus and extended over the entire galaxy, out to radii of 4 kpc, and likely induced by the interaction or merger with a member of the proto-cluster.

Abstract Copyright: © The Authors 2023

Journal keyword(s): infrared: galaxies - galaxies: high-redshift - galaxies: individual: GN20 - galaxies: starburst

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2025 		#notes
1 NAME SMM J123711+622212 AGN 12 37 11.92 +62 22 12.1   27.1786 25.185   24.4196 ~ 216 0

Query : 2023A&A...673L...6C

Basic data :
NAME SMM J123711+622212 -- Active Galaxy Nucleus
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types: otypes_help 		G (2015ApJ,GOODS,...), smm (2014ApJ,AzGN,...), Rad (2014ApJ,[MOD2010],...), IR (2011A&A), rG (2014ApJ), AGN (2012ApJ), mm ([PPC2011]), MIR ([SEB2016]), FIR (2011A&A)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) : 		12 37 11.92 +62 22 12.1 (Radio) [ 348 100 90 ] C 2018ApJS..235...34O
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) : 		12 34 58.29 +62 38 41.6 [ 348 100 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) : 		125.78673 +54.67923 [ 348 100 90 ]
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, ∼=unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz : 		V(km/s) 277169 [~] / z(spectroscopic) 4.05 [~] / cz 1214159 [~]
   (MIR) D 2012ApJ...759..139K
Syntax of angular size is : "maj-axis min-axis angle (wtype) quality bibcode"
  • maj-axis : major axis size (arc minutes)
  • min-axis : minor axis size (arc minutes)
  • angle : orientation angle (in degrees)
  • (wtype) : wavelength class for the origin of the angular size (Rad, mm, IR, Opt, UV, Xray, Gam)
  • quality : flag of quality of the angular size values ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the angular size reference
Angular size (arcmin): 		0.017 0.007 8 (Rad) C 2018ApJS..235...34O
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (7) :
B (AB) 27.1786 [0.4349] D 2004ApJ...600L..93G
V (AB) 25.185 [~] D 2009A&A...500..705M
I (AB) 24.4196 [0.0613] C 2004ApJ...600L..93G
K (AB) 22.753 [~] D 2009A&A...500..705M
r (AB) 25.2245 [0.0739] C 2004ApJ...600L..93G
i (AB) 24.487 [~] D 2009A&A...500..705M
z (AB) 24.1590 [0.0602] C 2004ApJ...600L..93G
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The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (21) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

NAME SMM J123711+622212 [BCC2014] CDFN 3 [LDD2018] 564 [PBS2005] GN20
AzGN 01 [CBH2017] SMM J123712+622210 [MMC2009c] 15541 [PPC2011] 1
GOODS J123711.81+622212.6 [FRP2015] z4 GNW 18340 [MOD2010] 862 [SEB2016] J123711.81+622212.3
GOODS J123711.88+622212.1 [GPS2008] GN 1200.1 [O2018] J123711.9+622212
HRG14 J123711.82+622212.3 [GPS2008] MM J123711+622211 [PBS2005] SMM J123711+622212
TKRS 1400 [KPA2012] GN-IRS64 [PBS2005] GN20.1

References (216 between 1850 and 2025) (Total 216)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Velocities : 4   

   

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Data at NED - NASA/IPAC Extragalactic Database : NAME SMM J123711+622212

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