2025ApJ...985..185M

Query : 2025ApJ...985..185M

2025ApJ...985..185M - Astrophys. J., 985, 185 (2025/June-1)

A Sandwich Model for Changing-look Active Galactic Nuclei.

MA Q.-Q., GU W.-M., CAI Z.-Y., CAO X., WANG J.-X., ZHANG Z.-X. and SUN M.

Abstract (from CDS):

The spectral variability of changing-look active galactic nuclei (CL-AGNs) occurred on timescales of years to tens of years, posing a significant challenge to the standard thin disk model. In this work, we propose a sandwich model, including an optically thick disk in the mid-plane (Disk 1) and two disks of low effective optical depth on both sides (Disk 2). These two types of disks are coupled with magnetic fields, which allow viscous torque interaction between them. As a consequence, the radial velocity of Disk 1 can increase by up to 3 orders of magnitude compared to the standard thin disk, leading to an equivalent decrease in the accretion timescale. Therefore, such a sandwich model can account for the rapid variability in CL-AGNs. In addition, we also discuss the influence of the magnetic pressure on Disk 2. When Disk 2 is dominated by the magnetic pressure, it resembles a “warm corona,” which is responsible for the soft X-ray excess.

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

Journal keyword(s): Accretion - Active galactic nuclei - Galaxy accretion disks - Black hole physics

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 Z 387-34 Sy1 02 06 15.9896281128 -00 17 29.221733688   15.90 15.50 10.3   ~ 405 0

Query : 2025ApJ...985..185M

Basic data :
Z 387-34 -- Seyfert 1 Galaxy
Other object types: otypes_help 		G (2016A&A,Mrk,...), AGN (2007AJ,[HB91],...), X (2007AJ,PBC,...), EmO (SCHG,UM), Rad (FIRST,NVSS), MIR (WISEA,WISE), Sy2 (2010A&A), Sy1 (2013ApJS), SyG (2023A&A), QSO (2015ApJ), * (Gaia), NIR (2MASS), Opt (SDSS)
ICRS coord. (ep=J2000) : 		02 06 15.9896281128 -00 17 29.221733688 (Optical) [ 0.3412 0.2718 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		02 03 42.4862913966 -00 31 46.138947033 [ 0.3412 0.2718 90 ]
Gal coord. (ep=J2000) : 		159.8194754742419 -57.7018216442425 [ 0.3412 0.2718 90 ]
Proper motions mas/yr : 		0.103 0.183 [0.528 0.322 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 12508 [150] / z(emission) 0.04263127 [0.0005] / cz 12780.5332 [150]
   (Opt) C 2022ApJS..261....2K
Morphological type: 		-1 D 2011A&A...532A..74B
Angular size (arcmin): 		0.93936 0.606357 174 (Opt) B 2023ApJS..269....3M
Fluxes (12) :
B 15.90 [~] D 2010A&A...518A..10V
V 15.50 [~] D 2010A&A...518A..10V
R 10.3 [~] E 2010MNRAS.401.1151M
G 18.074759 [0.012795] C 2020yCat.1350....0G
J 11.597 [0.033] C 2006AJ....131.1163S
H 10.935 [0.031] C 2006AJ....131.1163S
K 10.471 [0.041] C 2006AJ....131.1163S
u (AB) 15.440 [0.008] C 2008ApJS..175..297A
g (AB) 14.5206 [0.0067] B 2023ApJS..269....3M
r (AB) 13.594 [0.002] C 2008ApJS..175..297A
i (AB) 13.237 [0.002] C 2008ApJS..175..297A
z (AB) 13.0447 [0.0098] B 2023ApJS..269....3M
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 2 : 1 Display criteria :

Identifiers (44) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

Mrk 1018 PBC J0206.3-0016 SWIFT J0206.5-0016 Z 0203.7-0032
6dFGS gJ020616.0-001729 RBS 278 TIC 250416479 [HB91] 0203-005
FIRST J020615.9-001729 1RXP J020616.0-001732 UGC 1597 [HSN2016] J031.56-00.29
HE 0203-0031 RX J0206.3-0017 UM 393 [PVK2003] 031.56708 -00.29167
LEDA 8029 1RXS J020615.9-001728 UZC J020616.0-001729 [VV2000c] J020616.0-001729
MaNGA 10223-3701 SCHG 0203+005 1WGA J0206.2-0017 [VV2003c] J020616.0-001728
MaNGA 1-35650 SDSS J020615.98-001729.1 WISEA J020615.98-001729.2 [VV2006c] J020616.0-001728
2MASS J02061598-0017292 SDSS J020615.99-001729.2 WISE J020615.97-001729.1 [VV2010c] J020616.0-001728
2MASX J02061600-0017292 SDSS J020615.99-001729.1 2XMM J020615.9-001730 [VV98c] J020616.0-001729
MCG+00-06-030 SDSS J020615.98-001729.2 XMMSL1 J020615.7-001731 Gaia DR3 2507118340779676032
NVSS J020616-001730 SWIFT J0206.2-0019 Z 387-34 Gaia DR2 2507118340779676032

References (405 between 1850 and 2026) (Total 405)
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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Collections of Measurements Description of Measurements

Velocities : 19    Distance : 1    PM : 1   

   

Observing logs
Herschel : 3    IUE : 6    XMM : 1   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : Z 387-34

Link by name to the catalogue in VizieR :

FIRST J020615.9-001729 2MASS J02061598-0017292 2MASX J02061600-0017292 NVSS J020616-001730 1RXS J020615.9-001728
SDSS J020615.98-001729.1 SDSS J020615.99-001729.2 SDSS J020615.99-001729.1 SDSS J020615.98-001729.2 UGC 1597
UM 393 WISEA J020615.98-001729.2 WISE J020615.97-001729.1 Gaia DR3 2507118340779676032 Gaia DR2 2507118340779676032

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