2025RNAAS...9..133M

Query : 2025RNAAS...9..133M

2025RNAAS...9..133M - Research Notes of the AAS, 9, 133 (2025/June-0)

Enhanced Merger Fractions in a Reionization-era Protocluster.

MARCELIN L.C., CHAMPAGNE J.B., WANG F., FAN X., PUDOKA M., TEE W.L. and ZHU Y.

Abstract (from CDS):

Mergers play a critical role in galaxy evolution, but their relationship to their surrounding environments is unexplored at high redshift. We investigate the galaxy merger rate among 124 [O III] emitters at 5.3 < z < 6.9 as a function of local galaxy density. Identified in the ASPIRE JWST/NIRCam grism survey, we investigate three density regimes: a z = 6.6 quasar-centered protocluster, two overdensities at z = 5.4 and z = 6.2, and field galaxies. We evaluate merger candidates through close pair and morphological criteria in NIRCam imaging, finding that the z = 6.6 protocluster contains the highest fraction of galaxies meeting either criterion. We observe a >3σ enhancement of the merger fraction amongst all three overdense structures compared to the field. Eleven galaxies are classified as “active mergers” satisfying both merger criteria, all of which occur within the overdensity samples. We conclude that environment affects the merger rates of galaxies at z > 6, leading to increased specific star formation at the 4σ level.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Galaxy mergers - High-redshift galaxy clusters - James Webb Space Telescope

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 - 2026 		#notes
1 QSO J0305-3150 QSO 03 05 16.918 -31 50 55.85           ~ 102 0

Query : 2025RNAAS...9..133M

Basic data :
QSO J0305-3150 -- Quasar
Other object types: otypes_help 		QSO (2013ApJ,QSO), AG? ([BWC2021]), NIR (VIKING), MIR (WISE)
ICRS coord. (ep=J2000) : 		03 05 16.918 -31 50 55.85 (mm) [ 10 40 90 ] C 2020ApJ...904..130V
FK4 coord. (ep=B1950 eq=1950) : 		03 03 13.176 -32 02 31.47 [ 10 40 90 ]
Gal coord. (ep=J2000) : 		230.300569 -60.611261 [ 10 40 90 ]
Radial velocity / Redshift / cz : 		V(km/s) 289625 [60] / z(emission) 6.6139 [0.0002] / cz 1982797 [60]
   (mm) D 2020ApJ...904..130V
Fluxes (3) :
J (AB) 20.602 [0.0458] C 2020MNRAS.494..789R
H (AB) 20.677 [0.1056] D 2020MNRAS.494..789R
K (AB) 20.265 [0.0847] C 2020MNRAS.494..789R
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Identifiers (4) :
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QSO J0305-3150 VIKING J030516.92-315056.0 WISE J030516.89-315055.5 [BWC2021] J030516.91-315055.9

References (102 between 1850 and 2026) (Total 102)
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 : 2   

   

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WISE J030516.89-315055.5

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