How to convert flux from counts to erg.

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Discussion Overview

The discussion revolves around converting the flux of a source observed by a telescope from counts/cm²/sec to erg/cm²/sec within a specific energy band (15-50 keV). Participants are exploring the necessary steps and considerations for this conversion.

Discussion Character

  • Exploratory, Technical explanation, Homework-related

Main Points Raised

  • One participant inquires about the method to convert flux from counts to erg, providing a specific energy band and a reference image.
  • Another participant suggests that each count corresponds to a photon and proposes multiplying the number of photons by their energy, followed by a conversion from keV to erg, but later expresses uncertainty about the graph's details.
  • A third participant clarifies that the bottom axis of the graph represents time in MJD (modified Julian date).
  • A subsequent reply indicates a lack of knowledge on the topic, acknowledging the inability to assist further.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the conversion method, and multiple viewpoints are presented without resolution.

Contextual Notes

There are uncertainties regarding the specific conversion constants needed and the interpretation of the graph referenced by the initial poster.

Who May Find This Useful

This discussion may be useful for individuals interested in astrophysics, particularly those working with observational data and flux measurements in high-energy astrophysics.

RHK
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Hello everyone.
I am trying to translate the flux of a source observed by a telescope, in different units.
In my case, I have the flux equal to counts/cm^2/sec in a given energy band (15-50 keV) and I want to translate this information in erg/cm^2/sec, in the same energy band
Here you can find an example: http://heasarc.gsfc.nasa.gov/docs/swift/results/transients/weak/GX304-1.png

Does anyone know how can I do that?

Every suggestion is really appreciated.
Ciao
 
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each count is just a photon with that specific energy level, so you just have to multiply the number of photons by the energy of the photons. Then of course convert from keV to erg, which just means multiplying by some conversion constants.

er wait, I think I misread the graph, sorry >.> what's on the bottom axis?
 
The time, in MJD (modified julian date, it is like "days").
 
oh, I see, I'm sorry but I thought I could help but I don't know either
 

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