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  • 48 votes cast
Feb
2
comment What is “emission measure”?
I know how to calculate it now. Thank you.
Feb
2
accepted What is “emission measure”?
Feb
1
comment What is “emission measure”?
What does this interation mean? Why do we integrate like this? You can not say E is $mc^2$ and that is all. We can not derive $Ne$ in a light curve directly. How to derive it then? I have specified my question clearly before your answer, right?
Feb
1
revised What is “emission measure”?
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Jan
31
comment What is “emission measure”?
Your answer can be found in general papers, but they do not give a clear and direct definition about EM. There is no direct expression of EM either. Usually expressions of EM carry electron density, but Ne can not be derived from a light curve.
Jan
30
comment What is “emission measure”?
@pela Ne is not a direct observational quantity. There are other expressions of EM, which can be derived by analysing a light curve.
Jan
30
revised What is “emission measure”?
added 154 characters in body
Jan
30
asked What is “emission measure”?
Dec
23
revised Can we draw a min(distance) and max(mass) relation based on current observation data of nearby astronomical objects within several parcsecs?
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Dec
23
revised Can we draw a min(distance) and max(mass) relation based on current observation data of nearby astronomical objects within several parcsecs?
added 60 characters in body; edited title
Dec
22
awarded  Benefactor
Dec
21
accepted How to tell a pulsar is rotation-powered or accretion-powered?
Dec
19
comment How to tell a pulsar is rotation-powered or accretion-powered?
As I said, "if Lx is very low, the question is tricky“ If Lx is very small, smaller than the luminosity given by its rotation, how to tell it is rotation-powered or accretion-powered? There are not necessarily X-ray pulsations
Dec
19
comment How to tell a pulsar is rotation-powered or accretion-powered?
Both rotation and accretion can lead to X-ray emission. How to tell how much X-ray emission is from rotation?
Dec
19
comment How to tell a pulsar is rotation-powered or accretion-powered?
If a pulsar pulses in X-ray band, and its Lx is very small, how to tell it is accretion-powered or rotation-powered?
Dec
18
revised How to tell a pulsar is rotation-powered or accretion-powered?
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Dec
18
comment How to tell a pulsar is rotation-powered or accretion-powered?
pulsar magnetic field. 'The rates of spin down', you mean in X-ray band, right?
Dec
18
comment How to tell a pulsar is rotation-powered or accretion-powered?
@Daniel which kind of drawings?
Dec
18
comment How to tell a pulsar is rotation-powered or accretion-powered?
if Lx is very low, the question is tricky.
Dec
18
revised How to tell a pulsar is rotation-powered or accretion-powered?
added 55 characters in body