Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The sub-mJy radio sky in the Extended Chandra Deep Field South: source
  population   The sub-mJy radio population is a mixture of active systems, that is star
forming galaxies (SFGs) and active galactic nuclei (AGNs). We study a sample of
883 radio sources detected at 1.4 GHz in a deep Very Large Array survey of the
Extended Chandra Deep Field South (E-CDFS) that reaches a best rms sensitivity
of 6 microJy. We have used a simple scheme to disentangle SFGs, radio-quiet
(RQ), and radio-loud (RL) AGNs based on the combination of radio data with
Chandra X-ray data and mid-infrared observations from Spitzer. We find that at
flux densities between about 30 and 100 microJy the radio population is
dominated by SFGs (~60%) and that RQ AGNs become increasingly important over RL
ones below 100 microJy. We also compare the host galaxy properties of the three
classes in terms of morphology, optical colours and stellar masses. Our results
show that both SFG and RQ AGN host galaxies have blue colours and late type
morphology while RL AGNs tend to be hosted in massive red galaxies with early
type morphology. This supports the hypothesis that radio emission in SFGs and
RQ AGNs mainly comes from the same physical process: star formation in the host
galaxy.

31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
1
The categories of this paper are: cs