2009ApJ...699.1720K

Query : 2009ApJ...699.1720K

2009ApJ...699.1720K - Astrophys. J., 699, 1720-1731 (2009/July-2)

A new channel for detecting dark matter substructure in galaxies: gravitational lens time delays.

KEETON C.R. and MOUSTAKAS L.A.

Abstract (from CDS):

We show that dark matter substructure in galaxy-scale halos perturbs the time delays between images in strong gravitational lens systems. The variance of the effect depends on the subhalo mass function, scaling as the product of the substructure mass fraction, and a characteristic mass of subhalos (namely 2>/). Time delay perturbations therefore complement gravitational lens flux ratio anomalies and astrometric perturbations by measuring a different moment of the subhalo mass function. Unlike flux ratio anomalies, "time delay millilensing" is unaffected by dust extinction or stellar microlensing in the lens galaxy. Furthermore, we show that time delay ratios are immune to the radial profile degeneracy that usually plagues lens modeling. We lay out a mathematical theory of time delay perturbations and find it to be tractable and attractive. We predict that in "cusp" lenses with close triplets of images, substructure may change the arrival-time order of the images (compared with smooth models). We discuss the possibility that this effect has already been observed in RX J1131-1231.

Abstract Copyright: ∼

Journal keyword(s): dark matter - gravitational lensing - time

Simbad objects: 11

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Number of rows : 11
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 B1115+080A QSO 11 18 16.951 +07 45 58.23   16.61 16.44     ~ 703 2
2 QSO B1115+080B QSO 11 18 16.98 +07 45 55.7   18.74 18.1     ~ 53 0
3 QSO B1115+080C QSO 11 18 17.00 +07 45 57.7   18.26 17.6     ~ 57 0
4 [YDG81] QSO 1115+080 A1 LeI 11 18 17.09 +07 45 55.7           ~ 48 0
5 [YDG81] QSO 1115+080 A2 LeI 11 18 17.10 +07 45 56.1           ~ 46 0
6 [SSC2003] D LeQ 11 31 51.32 -12 31 57.8           ~ 41 0
7 [SSC2003] C LeQ 11 31 51.50 -12 31 59.8           ~ 43 0
8 2MASS J11315154-1231588 Sy1 11 31 51.5387 -12 31 58.716           ~ 304 1
9 [SSC2003] A LeQ 11 31 51.54 -12 31 58.7           ~ 44 0
10 [SSC2003] B LeQ 11 31 51.54 -12 31 57.5           ~ 42 0
11 NAME Local Group GrG ~ ~           ~ 9325 0

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