  In the two-dimensional framework, the surface gravity of a (classical) black
hole is independent of its mass $M$. As a consequence, the Hawking temperature
and outflux are also independent of $M$ at the large-$M$ limit. (This contrasts
with the four-dimensional framework, in which the surface gravity and
temperature scale as 1/M.) However, when the semiclassical backreaction effects
on the black-hole geometry are taken into account, the surface gravity is no
longer $M$-independent, and the same applies to the Hawking temperature and
outflux. This effect, which vanishes at the large-$M$ limit, increases with
decreasing $M$. Here we analyze the semiclassical field equations for a
two-dimensional static black hole, and calculate the leading-order backreaction
effect ($\propto 1/M$) on the Hawking temperature and outflux. We then confirm
our analytical result by numerically integrating the semiclassical field
equations.
