<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">                         HerMES-DR4 - SPIRE Maps (SMAP)                July 2016
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Contact: eduardo.ibar@uv.cl
E.Ibar
2016-06-29

Description:

  This is the README file for the PACS map files associated with the fourth
  Hershel-SPIRE/SAG-1/HerMES public data release (DR4).

  The HerMES program is presented in [1].

  The maps are produced using the Unimap software [2,3,4]

  If you have any questions, comments or concerns please contact Edo Ibar


File names:

  The file names indicate the level, field, and band:

  â€œHerMES_PACS_â€&lt;level&gt;â€_â€&lt;field&gt;â€_â€&lt;band&gt;â€um_EdoIba_Unimap.fitsâ€

  For instance, HerMES_PACS_level5_Bootes_HerMES_100um_EdoIbar_Unimap.fits

  The &lt;Levels&gt; and &lt;fields&gt; and raw data correspond to the names and AOR sets
  listed in Table 1 of reference [1]

  The two bands presented at the PACS Green band (&lt;band&gt;=â€œ100â€) and the PACS Red
  band (&lt;band&gt;=â€œ160â€)


File content:

  Each fits file in this data release contains 4 extensions:

  1 - â€˜imageâ€™ signal map [Jy / pixel]
  2 - â€˜errorâ€™ standard deviation in signal [Jy / pixel]
  3 - â€˜coverageâ€™ detector counts per pixel
  4 - â€˜maskâ€™ mask map with the following values:
          0: no observed pixel
          1: observed pixel

 The Error is estimated my assuming the fluctuations in the image are all noise
 variations and the variance is inversely proportional to the coverage.

Definition of the fields
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The fields released here are:
  level3_LHN
  level3_SDP_LHN
  level3_UDS_HerMES
  level4_UDS
  level5_Bootes_HerMES
  level5_CDFS_SWIRE
  level5_EGS
  level5_ELAIS_N1_HerMES
  level5_Lockman_SWIRE
  level5_XMM_VIDEO1
  level5_XMM_VIDEO2
  level5_XMM_VIDEO3
  level6_ADFS
  level6_Bootes_NDWFS
  level6_ELAIS_N1_SWIRE
  level6_ELAIS_N2_SWIRE
  level6_ELAIS_S1_VIDEO
  level6_FLS
  level6_XMM_LSS_SWIRE


Details of the Map Making process
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HerMES PACS scanning mode observations are obtained using PACS prime (levels
3 &amp; 4) and SPIRE/PACS parallel modes (levels 5 &amp; 6). All observations are
reduced considering the following stages: (a) raw data (level-0) are retrieved
from the Herschel Science Archive (HSA); (b) level-0 data are processed within
HIPE up to level-1 (calibrated timelines) following a similar approach as
described in [5]; (c) these calibrated data are then converted to timeseries
using the interface UniHIPE (a tool developed by the ASI Science Data Center),
(d) and finally run a maximum likelihood imaging approach using Unimap.

References
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[1] Oliver, S.~J., Bock, J., et al. 2012, MNRAS, 424, 1614
[2] Piazzo, et al., 2012, ITIP, 21, 3687. http://infocom.uniroma1.it/unimap/
[3] Piazzo, et al., Signal Processing, vol. 108, pp. 430-439, 2015.
[4] Piazzo L et al., MNRAS, 2015, 447, pp. 1471-1483.
[5] Ibar et al., 2010, MNRAS, 409, 38
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History:

 July 1st, 2015: Fourth Hermes data release.

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The research leading to these results has received funding from the Cooperation
Programme (Space) of the European Unionâ€™s Seventh Framework Programme
FP7/2007-2013/ under REA grant agreement nÂ° 607254

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Herschel Extragalactic Legacy Programme (HELP)                        July, 2016
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