Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exploring the physical properties of lensed star-forming clumps at
  $2\lesssim z \lesssim6$   We study the physical properties (size, stellar mass, luminosity, star
formation rate) and scaling relations for a sample of 166 star-forming clumps
with redshift $z \sim 2-6.2$. They are magnified by the Hubble Frontier Field
galaxy cluster MACS~J0416 and have robust lensing amplification ($2\lesssim \mu
\lesssim 82$) computed by using our high-precision lens model, based on 182
multiple images. Our sample extends by $\sim 3$ times the number of
spectroscopically-confirmed lensed clumps at $z \gtrsim 2$. We identify clumps
in ultraviolet continuum images and find that, whenever the effective spatial
resolution (enhanced by gravitational lensing) increases, they fragment into
smaller entities, likely reflecting the hierarchically-organized nature of star
formation. Kpc-scale clumps, most commonly observed in non-lensed fields, are
not found in our sample. The physical properties of our sample extend the
parameter space typically probed by $z \gtrsim 1$ non-lensed observations and
simulations, by populating the low mass (M$_\star \lesssim 10^7$ M$_\odot$),
low star formation rate (SFR $\lesssim 0.5$ M$_\odot$ yr$^{-1}$), and small
size (R$_\mathrm{eff} \lesssim 100$ pc) regime. The new domain probed by our
study approaches the regime of compact stellar complexes and star clusters. In
the mass-size plane our sample span the region between galaxies and globular
clusters, with a few clumps laying in the region populated by young star
clusters and globular-clusters. For the bulk of our sample, we measure
star-formation rates which are higher than those observed locally in compact
stellar systems, indicating different conditions for star formation at high
redshift and in the local Universe.

23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom