### Resumen

Using observations of the high magnification event seen in image C of quasar Q2237+0305 during 1999 we have obtained constraints on the structure of the quasar’s central engine. Data taken with the Apache Point Observatory 3.5 mts telescope in the g’ and the r’ bands shows a smaller amplitude of the event in the r’ filter. We compare these observations and those presented by the OGLE team with synthetic source plane microlensing magnification patterns in order to obtain constraints on the size of the accretion disk regions contributing to each band. We obtain for the Gaussian width 1.20 × 10^{15}M/0.1M cm σ_{g} 7.96 × 10^{15}M/0.1M cm, where M is the mean microlensing mass, and a ratio σ_{r} /σ_{g} = 1.25^{+}
_{−}
^{0}
_{0}
^{45}
_{15}. With the limits on the velocity of the lensing galaxy from Gil-Merino et al. (2005)[2] as our only prior, we obtain 0.60 × 10^{15}M/0.1M cm σ_{g} 1.57 × 10^{15}M/0.1M cm and a ratio σ_{r} /σ_{g} = 1.45^{+}
_{−}
^{0}
_{0}
^{90}
_{25} (all values at 68 percent confidence). Additionally, from our microlensing simulations we find that, during the chromatic microlensing event observed, the continuum emitting region of the quasar crossed a caustic at ≥ 72 percent confidence. This contribution is based on the research presented in Anguita et al. (2008)[1].

Idioma original | Inglés |
---|---|

Número de artículo | 013 |

Publicación | Proceedings of Science |

Volumen | 54 |

Estado | Publicada - 1 ene 2008 |

Evento | Manchester Microlensing Conference, M2C: 12th International Conference on Gravitational Microlensing, and ANGLES Microlensing Workshop, GMC 2008 - Manchester, Reino Unido Duración: 21 ene 2008 → 25 ene 2008 |

### Áreas temáticas de ASJC Scopus

- General

## Huella Profundice en los temas de investigación de 'A quasar under a microlensing caustic'. En conjunto forman una huella única.

## Citar esto

*Proceedings of Science*,

*54*, [013].