Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Galaxy-CMB Lensing   A long-standing problem in astrophysics is to measure the mass associated
with galaxies. Gravitational lensing provides one of the cleanest ways to make
this measurement. To date, the most powerful lensing probes of galactic mass
have been multiply imaged QSO's (strong lensing of a background point source)
and galaxy-galaxy lensing (weak deformation of many background galaxies). Here
we point out that the mass associated with galaxies also lenses the Cosmic
Microwave Background (CMB) and this effect is potentially detectable in small
scale experiments. The signal is small (roughly a few tenths of a microKelvin)
but has a characteristic shape and extends out well beyond the visible region
of the galaxy.

13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math