2025ApJ...994..201L

Query : 2025ApJ...994..201L

2025ApJ...994..201L - Astrophys. J., 994, 201 (2025/December-1)

The “Little Dark Dot”: Evidence for Self-interacting Dark Matter in the Strong Lens SDSS J0946+1006?

LI S., LI R., WANG K., JIA Z., CAO X., FRENK C.S., JIANG F., AMVROSIADIS A., COLE S., HE Q., LANGE S.C., MASSEY R., NIGHTINGALE J.W., ROBERTSON A., VON WIETERSHEIM-KRAMSTA M. and MA X.

Abstract (from CDS):

Previous studies, based on precise modeling of a gravitationally lensing image, have identified what may be an extremely compact, dark perturber in the well-known lensing system SDSS J0946+1006 (the “Jackpot”). Its remarkable compactness challenges the standard cold dark matter paradigm. In this paper, we explore whether such a compact perturber could be explained as a core-collapse halo described by the self-interacting dark matter (SIDM) model. Using the isothermal Jeans method, we compute the density profiles of core-collapse halos across a range of masses. Our comparison with observations indicates that a core-collapse halo has an inner density profile and mass enclosed within 1 kpc that fit the data well, but only if the halo has a total mass of ∼1011M⊙. While a halo of this mass should host a detectable galaxy, the current observational upper limit on the perturber's luminosity remains uncertain. Resolving whether or not the data support the presence of a core-collapse SIDM halo therefore requires future deep observations to measure its luminosity.

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

Journal keyword(s): Strong gravitational lensing - Dark matter - Galaxy dark matter halos

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 NVSS J094656+100649 rG 09 46 56.6809160266 +10 06 52.903093208     17.78   17.09 ~ 41 0

Query : 2025ApJ...994..201L

Basic data :
NVSS J094656+100649 -- Radio Galaxy
Other object types: otypes_help 		rG (), G (2008ApJS,SLACS), gLe (2008ApJ,[GTK2008]), Rad (NVSS,FIRST), * (Gaia), NIR (2MASS), MIR (WISE), Opt (SDSS)
ICRS coord. (ep=J2000) : 		09 46 56.6809160266 +10 06 52.903093208 (Optical) [ 23.6792 17.0010 90 ] C 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		09 44 16.2650012576 +10 20 47.637402199 [ 23.6792 17.0010 90 ]
Gal coord. (ep=J2000) : 		225.2404804064599 +43.4207698358608 [ 23.6792 17.0010 90 ]
Radial velocity / Redshift / cz : 		V(km/s) 59296 [18] / z(spectroscopic) 0.22193 [0.00006] / cz 66532.9 [18.0]
   (Opt) C 2020ApJS..249....3A
Morphological type: 		E D 2009ApJ...705.1099A
Fluxes (11) :
V 17.78 [~] D 2009ApJ...705.1099A
G 21.700422 [0.041170] C 2022yCat.1355....0G
I 17.09 [~] D 2008ApJ...682..964B
J 16.176 [0.129] C 2003yCat.2246....0C
H 15.657 [0.166] D 2003yCat.2246....0C
K 15.072 [0.193] D 2003yCat.2246....0C
u (AB) 20.946 [0.185] D 2020ApJS..249....3A
g (AB) 19.064 [0.016] C 2020ApJS..249....3A
r (AB) 17.700 [0.008] B 2020ApJS..249....3A
i (AB) 17.170 [0.007] B 2020ApJS..249....3A
z (AB) 16.862 [0.020] C 2020ApJS..249....3A
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1 : 1 Display criteria :

Identifiers (8) :
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NVSS J094656+100649 2MASS J09465667+1006527 SLACS SDSS J0946+1006 lens [GTK2008] Lens 1
FIRST J094656.6+100652 SDSS J094656.68+100652.8 WISE J094656.69+100652.7 Gaia DR3 612534732378414464

References (41 between 1850 and 2026) (Total 41)
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 : 1   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : NVSS J094656+100649

Link by name to the catalogue in VizieR :

NVSS J094656+100649 FIRST J094656.6+100652 2MASS J09465667+1006527 SDSS J094656.68+100652.8 WISE J094656.69+100652.7
Gaia DR3 612534732378414464

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