Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hidden Trigger for the Giant Starburst Arc in M 83?   The huge star formation events that occur at some galactic centers do not
provide enough clues as to their origin, since the morphological signatures of
the triggering mechanism are smeared out in the timescale of a few orbital
revolutions of the galaxy core. Our high spatial resolution three-dimensional
near-infrared spectroscopy for the first time reveals that a previously known
hidden mass concentration is located exactly at the youngest end of a giant
star-forming arc. This location, the inferred average cluster ages, and the
dynamical times clearly indicate that the interloper has left behind a spur of
violent star formation in M 83, in a transient event lasting less than one
orbital revolution. The study of the origin (bar funneling or cannibalized
satellite) and fate (black hole merging or giant stellar cluster) of this
system could provide clues to the question of core growing and morphological
evolution in grand-design spiral galaxies. In particular, our TreeSPH numerical
modeling suggests that the two nuclei could coalesce, forming a single massive
core in about 60 million years or less.

7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat