2025PASJ...77.1329F

Query : 2025PASJ...77.1329F

2025PASJ...77.1329F - Publ. Astron. Soc. Jap., 77, 1329-1334 (2025/December-0)

Clumpy-gas radiation hydrodynamics: Application to quasar PDS 456.

FUKUE J.

Abstract (from CDS):

Based upon clumpy-gas radiation hydrodynamics developed recently, we examine super-Eddington clumpy outflows in active galactic nuclei, using steady purely spherical winds and centrifugal-assisted semi-spherical outflows. Despite the models being quite simple, the dynamical properties of clumps in quasar PDS 456 can be roughly explained. In the clumps-gas two-component fluids, the efficiency of the radiative force acting on clumps is less than unity, compared with that acting on the ambient gas, and becomes smaller as the optical depth is larger. Hence, as for quasar PDS 456 with the Eddington parameter of $\Gamma =1.6$ and the clump speed $u_\infty$ of $0.2\, c$ - $0.3\, c$ , the optical depth $\tau _{\rm c}$ of clumps must be less than 5. Furthermore, the clumps with $\tau _{\rm c}=1$ would be launched between $7\, r_{\rm S}$ (for $u_\infty =0.3\, c$ ) and $16\, r_{\rm S}$ (for $u_\infty =0.2\, c$ ), where $r_{\rm S}$ is the Schwarzschild radius of the central black hole. In addition, the speed of the ambient gaseous matter would be higher than clumps, and would be around $0.3\, c$ - $0.4\, c$ .

Abstract Copyright: © The Author(s) 2025. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved. For commercial re-use, please contact for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site-for further information please contact

Journal keyword(s): accretion - accretion disks - galaxies: active - hydrodynamics - radiation: dynamics - quasars: individual (PDS 456)

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 B1725-142	QSO	17 28 19.7893499760	-14 15 55.854918288		14.69	14.03	13.7		~	362	0

Query : 2025PASJ...77.1329F

Basic data :

QSO B1725-142 -- Quasar

QSO (2010A&A,QSO,...), X (RX,1RXS,...), AGN (2012MNRAS), Sy1 (2012MNRAS), G (6dFGS), * (Gaia), Rad (NVSS), UV (UVQS), IR (IRAS)

17 28 19.7893499760 -14 15 55.854918288 (Optical) [ 0.0181 0.0139 90 ] A 2020yCat.1350....0G

17 25 29.2209557175 -14 13 31.621904342 [ 0.0181 0.0139 90 ]

010.3921641157749 +11.1635704912558 [ 0.0181 0.0139 90 ]

0.028 -0.036 [0.023 0.015 90] A 2020yCat.1350....0G

V(km/s) 50158 [~] / z(emission) 0.184 [~] / cz 55162 [~] (Opt) D 2016ApJ...818..113N

B 14.69 [~] D 2010A&A...518A..10V

V 14.03 [~] D 2010A&A...518A..10V

R 13.7 [~] E 2010MNRAS.401.1151M

G 14.090639 [0.003350] C 2020yCat.1350....0G

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`QSO B1725-142`	`PDS 456`	`2XMM J172819.7-141555`	`[VV2010] J172819.9-141556`
`6dFGS gJ172819.8-141556`	`QSO J1728-1415`	`XSS J17276-1359`	`[VV98] J172819.8-141256`
`IRAS 17254-1413`	`RX J1728.3-1416`	`[VV2000] J172819.8-141256`	`Gaia DR2 4137524313328406144`
`LQAC 262-014 001`	`1RXS J172819.3-141600`	`[VV2003] J172819.9-141556`	`Gaia DR3 4137524313328406144`
`NVSS J172819-141555`	`UVQS J172819.79-141555.8`	`[VV2006] J172819.9-141556`

References (362 between 1850 and 2026) (Total 362)
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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Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : QSO B1725-142

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IRAS 17254-1413 NVSS J172819-141555 1RXS J172819.3-141600 Gaia DR2 4137524313328406144 Gaia DR3 4137524313328406144

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