### Abstract

Gravitational lenses on arcseconds scales provide a tool to probe the mass distribution in the lensing galaxies at redshift z 0.5-1.0. Image positions can be fitted using simple smooth galaxy mass models, but observed fluxes are more difficult to match. We analyze the effects of substructures in galaxy halos to explain such anomalies in the cusp and fold lensing configurations. In the first case we use detailed numerical simulations combined with a Monte Carlo approach to compare predictions from the ACDM small scale mass function with observed flux ratios. We extended our analysis down to a mass of ≈ 10^{5} M_{⊙} for the subhalos. In the second case we try to constrain, with semianalytical approach, the mass and the position of a substructure by considering its effects on the flux of the images: we add to a smooth lens model, which reproduces well the positions of the images but not the anomalous fluxes, one or two substructures (in the mass range ∼ 10^{6} -10^{8} M_{⊙}) described as singular isothermal spheres. In a work in progress we take into account the effect of substructures along the line of the sight.

Original language | English (US) |
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Title of host publication | 11th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories - Proc. of the MG11 Meeting on General Relativity |

Pages | 1731-1733 |

Number of pages | 3 |

State | Published - Dec 1 2008 |

Event | 11th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories, MG 2006 - Berlin, Germany Duration: Jul 23 2006 → Jul 29 2006 |

### Other

Other | 11th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories, MG 2006 |
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Country | Germany |

City | Berlin |

Period | 7/23/06 → 7/29/06 |

### Fingerprint

### Keywords

- Gravitational lensing

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

*11th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories - Proc. of the MG11 Meeting on General Relativity*(pp. 1731-1733)

**QSO lensing.** / Miranda, M.; Jetzer, P.; Maccio, Andrea.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*11th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories - Proc. of the MG11 Meeting on General Relativity.*pp. 1731-1733, 11th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories, MG 2006, Berlin, Germany, 7/23/06.

}

TY - GEN

T1 - QSO lensing

AU - Miranda, M.

AU - Jetzer, P.

AU - Maccio, Andrea

PY - 2008/12/1

Y1 - 2008/12/1

N2 - Gravitational lenses on arcseconds scales provide a tool to probe the mass distribution in the lensing galaxies at redshift z 0.5-1.0. Image positions can be fitted using simple smooth galaxy mass models, but observed fluxes are more difficult to match. We analyze the effects of substructures in galaxy halos to explain such anomalies in the cusp and fold lensing configurations. In the first case we use detailed numerical simulations combined with a Monte Carlo approach to compare predictions from the ACDM small scale mass function with observed flux ratios. We extended our analysis down to a mass of ≈ 105 M⊙ for the subhalos. In the second case we try to constrain, with semianalytical approach, the mass and the position of a substructure by considering its effects on the flux of the images: we add to a smooth lens model, which reproduces well the positions of the images but not the anomalous fluxes, one or two substructures (in the mass range ∼ 106 -108 M⊙) described as singular isothermal spheres. In a work in progress we take into account the effect of substructures along the line of the sight.

AB - Gravitational lenses on arcseconds scales provide a tool to probe the mass distribution in the lensing galaxies at redshift z 0.5-1.0. Image positions can be fitted using simple smooth galaxy mass models, but observed fluxes are more difficult to match. We analyze the effects of substructures in galaxy halos to explain such anomalies in the cusp and fold lensing configurations. In the first case we use detailed numerical simulations combined with a Monte Carlo approach to compare predictions from the ACDM small scale mass function with observed flux ratios. We extended our analysis down to a mass of ≈ 105 M⊙ for the subhalos. In the second case we try to constrain, with semianalytical approach, the mass and the position of a substructure by considering its effects on the flux of the images: we add to a smooth lens model, which reproduces well the positions of the images but not the anomalous fluxes, one or two substructures (in the mass range ∼ 106 -108 M⊙) described as singular isothermal spheres. In a work in progress we take into account the effect of substructures along the line of the sight.

KW - Gravitational lensing

UR - http://www.scopus.com/inward/record.url?scp=84893011392&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84893011392&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84893011392

SN - 9812834265

SN - 9789812834263

SP - 1731

EP - 1733

BT - 11th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories - Proc. of the MG11 Meeting on General Relativity

ER -