Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two formation paths for cluster dwarf galaxies?   A surprising result of our recent spectroscopic survey of galaxies in the
Coma cluster has been the discovery of a possible bimodal distribution in the
metallicities of faint galaxies at $M_B>-17$. We identified a group of dwarfs
with luminosity-weighted metallicities around solar and a group with [M/H]
around -1.5. A metallicity bimodality among galaxies of similar luminosities is
unexpected and suggests that faint cluster galaxies could be an heterogeneous
population that formed through more than one evolutionary path, possibly as a
consequence of the cluster environment.

4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con