HerMES-DR4 - SPIRE Maps (SMAP) July 2016 ================================================================================ 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: "HerMES_PACS_""_""_""um_EdoIba_Unimap.fits" For instance, HerMES_PACS_level5_Bootes_HerMES_100um_EdoIbar_Unimap.fits The and 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 (="100") and the PACS Red band (="160") File content: Each fits file in this data release contains 4 extensions: 1 - 'image' signal map [Jy / pixel] 2 - 'error' standard deviation in signal [Jy / pixel] 3 - 'coverage' detector counts per pixel 4 - 'mask' 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 ------------------------ 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 --------------------------------- HerMES PACS scanning mode observations are obtained using PACS prime (levels 3 & 4) and SPIRE/PACS parallel modes (levels 5 & 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 ---------- [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 -------------------------------------------------------------------------------- History: July 1st, 2015: Fourth Hermes data release. -------------------------------------------------------------------------------- The research leading to these results has received funding from the Cooperation Programme (Space) of the European Union's Seventh Framework Programme FP7/2007-2013/ under REA grant agreement no. 607254 ================================================================================ Herschel Extragalactic Legacy Programme (HELP) July, 2016