Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Herschel/PACS Point Source Catalogue Explanatory Supplement   The Herschel Space Observatory was the fourth cornerstone mission in the
European Space Agency (ESA) science programme. It had excellent broad band
imaging capabilities in the far-infrared (FIR) and sub-millimetre part of the
electromagnetic spectrum. Although the spacecraft finished observing in 2013,
it left a large legacy dataset that is far from having been fully explored and
still has a great potential for new scientific discoveries. The PACS and SPIRE
photometric cameras observed about 8% of the sky in six different wavebands.
This document describes the Herschel/PACS Point Source Catalogue (HPPSC), a FIR
catalogue based on the broad-band photometric observations of the PACS
instrument with filters centred at 70, 100 and 160 microns.
  We analysed 14842 combined, Level 2.5/Level 3 Herschel/PACS photometric
observations. The PACS photometer maps were generated by the JScanam task of
the Herschel Interactive Processing Environment (HIPE) v13.0.0. Sources were
identified with the HIPE implementation of SUSSEXtractor, and the flux
densities obtained by aperture photometry. We found a total of 108 319 point
sources that are considered to be reliable in the 70 micron maps, 131 322 at
100 micron and 251 392 point sources in the 160 micron maps. In addition, our
quality control algorithm identified 546 587 candidate sources that were found
to be extended and 7 185 160 features which did not pass the signal-to-noise
and other criteria to be considered reliable sources. These sources were
included in the Extended Source List and Rejected Source List of the HPPSC,
respectively. The calculated completeness and photometric accuracy values are
based on simulations, where artificial sources were injected into the
observational timeline with well controlled flux density values. The actual
completeness is a complex function of the source flux, photometric band and the
background complexity.

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