class-herschel-fits

IRAM Memo 2015-3
Importing Herschel-FITS into CLASS
S. Bardeau, D.Teyssier, D.Rabois, J. Pety
1. IRAM (Grenoble)
2. ESAC (Madrid)
3. IRAP (Toulouse)
4. Observatoire de Paris
October, 28 2016
Version 1.0.1

### Abstract:

Herschel/HIFI data were already readable by CLASS after conversion into specific FITS file by the HiClass task from HIPE. These FITS files are however not the ones served by the Herschel Science Archive as result of the standard data processing. The CLASS community thus requested the possibility to fill Herschel/HIFI archive science products directly into CLASS.

In a nutshell, the new filler automatically recognizes the Herschel/HIFI FITS level 2.0 and 2.5. The standard CLASS sections (General, Position, Spectroscopy, Calibration) are filled from the FITS header parameters. A dedicated Herschel section is added to the CLASS Data Format in order to attach HIFI specific metadata. The data are filled as one or several CLASS spectra depending of the FITS level and/or context (On-The-Fly, spectral survey, etc). The associated FLAG and LINE arrays are filled as associated arrays (new CLASS feature documented in a separate memo) to each spectrum data. This memo describes all these points in details.

Keywords: CLASS Data Format

Related documents: CLASS documentation, CLASS Associated Arrays.

- Contents
- Quick start guide
  - Supported HIPE versions
  - Importing Herschel-HIFI FITS
  - Observation header
  - Associated Arrays
  - Setting the source velocity
  - Going from to
- Look-up tables
  - Intensity array
  - General section
  - Spectroscopic section
  - Position section
  - Calibration section
  - Frequency Switch section
  - Herschel-HIFI section
  - Associated Arrays
- Technical details
  - Detecting an Herschel-HIFI FITS
  - FITS level
  - Cards and metacards
- Acknowledgements
- About this document ...