2023A&A...671A..44T

Query : 2023A&A...671A..44T

2023A&A...671A..44T - Astronomy and Astrophysics, volume 671A44 (2023/3-1)

Dynamical signature of a stellar bulge in a quasar-host galaxy at z ≃ 6.

TRIPODI R., LELLI F., FERUGLIO C., FIORE F., FONTANOT F., BISCHETTI M. and MAIOLINO R.

Abstract (from CDS):

We present a dynamical analysis of a quasar-host galaxy at z ≃ 6 (SDSS J2310+1855) using a high-resolution ALMA observation of the [CII] emission line. The observed rotation curve was fitted with mass models that considered the gravitational contribution of a thick gas disc, a thick star-forming stellar disc, and a central mass concentration, which is likely due to a combination of a spheroidal component (i.e. a stellar bulge) and a supermassive black hole (SMBH). The SMBH mass of 5 × 10⁹ M_⊙, previously measured using the CIV and MgII emission lines, is not sufficient to explain the high velocities in the central regions. Our dynamical model suggests the presence of a stellar bulge with a mass of M_bulge ∼ 10¹⁰M_⊙ in this object, when the Universe was younger than 1 Gyr. To finally be located on the local M_SMBH - M_bulge relation, the bulge mass should increase by a factor of ∼40 from z = 6 to 0, while the SMBH mass should grow by a factor of 4 at most. This points towards asynchronous galaxy-BH co-evolution. Imaging with the JWST will allow us to validate this scenario.

Abstract Copyright: © The Authors 2023

Journal keyword(s): quasars: individual: SDSS J231038.88+185519.7 - galaxies: high-redshift - galaxies: kinematics and dynamics - galaxies: bulges - techniques: interferometric

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	SDSS J231038.88+185519.7	QSO	23 10 38.888	+18 55 19.72						~	107	0

Query : 2023A&A...671A..44T

Basic data :

SDSS J231038.88+185519.7 -- Quasar

QSO (2013ApJ,QSO), MIR (WISE), Opt (SDSS)

23 10 38.888 +18 55 19.72 (Optical) [ 105 98 90 ] C 2011yCat.2306....0A

23 08 10.096 +18 39 01.87 [ 105 98 90 ]

092.255217 -37.873190 [ 105 98 90 ]

V(km/s) 287934 [~] / z(spectroscopic) 6.040 [~] / cz 1810746 [~] (Opt) D 2013ApJ...773...44W

J (AB) 18.862 [0.0473] C 2020MNRAS.494..789R

u (AB) 24.86 [1.66] E 2011yCat.2306....0A

g (AB) 24.87 [0.99] E 2011yCat.2306....0A

r (AB) 23.52 [0.60] E 2011yCat.2306....0A

i (AB) 21.99 [0.25] D 2011yCat.2306....0A

z (AB) 19.50 [0.03] C 2016ApJS..227...11B

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QSO J2310+1855 SDSS J231038.88+185519.7 WISE J231038.87+185519.3

References (107 between 1850 and 2026) (Total 107)
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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Data at NED - NASA/IPAC Extragalactic Database : SDSS J231038.88+185519.7

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