1
$\begingroup$

This question may appear to be the same as What is the luminosity of the Milky Way galaxy?, but that question references a value of $5\times 10^{36}\space W$, which comes from a Wiki page which references an article from 1999. While Rob Jeffries provides some excellent insight into the physics behind the value, it doesn't provide an objective answer to the original question. Does anyone have a more recent value for the absolute luminosity of the Milky Way that can be referenced?

$\endgroup$

1 Answer 1

1
$\begingroup$

As far as I know, the best current estimate is that the Milky Way galaxy has an absolute magnitude of

$$^0M_r - 5 \log h = -21.00^{+0.38}_{-0.37}$$

which is equivalent to a luminosity of $5.4 \times 10^{36}$ to $1.1 \times 10^{37}$ W. This makes the Milky Way one of the brightest known spiral galaxies.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.