IRAS Filter Profile: Computing ##\lambda_{mean}##

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It is not specifically mentioned in the conversation, but it can be inferred that T represents transmittance and lambda represents wavelength. The transmittance is usually measured and the data can be found in the provided link. In summary, the IRAS filter profile provides an equation for the mean value of transmittance, which can be calculated using data found in the provided link.
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tryingtolearn1
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IRAS filter profile
I am looking at the following IRAS filter profile IRAS Filter Profile and I am wondering how they computed ##\lambda_{mean}##? They provided the following equation below but what is ##T(\lambda)## and ##\lambda##?
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  • #2
Just a guess: T = transmittance and lambda = wavelength.
 
  • #3
DrStupid said:
Just a guess: T = transmittance and lambda = wavelength.

thanks but where did they get the transmittance?
 
  • #5
The equation itself is a mathematical expression for the mean value of T, whatever T is.
 

1. What is the IRAS Filter Profile?

The IRAS Filter Profile is a set of filters used by the Infrared Astronomical Satellite (IRAS) to measure the infrared radiation emitted by celestial objects. It consists of four filters, each with a specific wavelength range, that allow scientists to study different types of infrared emissions.

2. What is the purpose of computing ##\lambda_{mean}##?

The purpose of computing ##\lambda_{mean}## is to determine the average wavelength of the infrared radiation that is being measured by the IRAS Filter Profile. This can provide valuable information about the temperature and composition of the celestial object emitting the radiation.

3. How is ##\lambda_{mean}## calculated?

##\lambda_{mean}## is calculated by taking the weighted average of the four filter wavelengths in the IRAS Filter Profile. This means that the contribution of each filter to the overall average is based on its wavelength range and the amount of infrared radiation it detects.

4. Why is ##\lambda_{mean}## important in infrared astronomy?

##\lambda_{mean}## is important in infrared astronomy because it allows scientists to accurately measure the average wavelength of infrared radiation emitted by celestial objects. This information can help determine the temperature, composition, and other characteristics of these objects.

5. How is the IRAS Filter Profile used in scientific research?

The IRAS Filter Profile is used in scientific research by astronomers and other scientists who study infrared radiation emitted by celestial objects. By analyzing the data collected by the filters, they can gain insights into the physical properties and behavior of these objects, such as stars, galaxies, and interstellar dust clouds.

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