Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: XMM-Newton View of the Hubble Deep Field-North and Groth-Westphal Strip
  Regions   We report the progress on our analysis of two deep XMM observations in the
areas of Hubble Deep Field-North and the Groth-Westphal Strip field. We present
the source detection method, Monte-Carlo simulation on source detection, and
our preliminary Log N -- Log S relations. Comparing these two fields and other
fields in literature, we find up to 30% variations in number counts near our
flux limits, which is most likely to be due to cosmic variance. This serves as
a pilot study for a more systematic investigation. The nature of the X-ray
sources in the Groth-Westphal field is also discussed in terms of hardness
ratios, morphology and spectroscopic properties.

23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an