Influence of Microlensing on Spectral Anomaly of Lensed Objects

TL;DR

This paper investigates how microlensing affects the spectral features of a lensed object with multiple emission regions, revealing flux anomalies caused by microlensing in stratified sources.

Contribution

It introduces a model considering multiple black body emission regions and analyzes microlensing effects on their spectra, highlighting flux anomalies.

Findings

Microlensing causes flux anomalies in stratified emission regions.

Spectral differences are observed in U, V, and B bands due to microlensing.

Flux anomalies depend on the temperature and position of emission regions.

Abstract

Here we consider the influence of the microlensing on the spectrum of a lensed object taking into account that composite emission is coming from different regions arranged subsequently around the central source. We assumed that the lensed object has three regions with the black body emission; first the innermost with the highest temperature of $10^4K$, second and third (located around the central) with slightly lower temperatures $7.5\cdot10^3$ and $5\cdot10^3$K, respectively. Than we explore the flux anomaly in lensed object due to microlensing. We compare U,V and B spectra of a such source. This results show that, due to microlensing, in a spectroscopically stratified object a flux anomaly is present.