Herschel Calibration Workshop Cross Calibration Goals Anthony Marston
Herschel Calibration Workshop: Cross -Calibration Goals Anthony Marston & Elena Puga, Herschel Instrument and Calibration Scientist Team, HSC, ESAC.
Cross Cal Introduction Intra Instrument Calibration Consistency Planck cross-calibration Photometer Spectrometer Between modes of operation Cross Instrument Calibration Consistency Model Checks Stars Planets Asteroids Cross Observatory Calibration Consistency Observation feedback for these models Calibration legacy for other Observatories * Herschel Cross Calibration Plan and Use Cases, v 0. 1 25/08/2010 (HERSCHEL-HSC-DOC-1720) * Herschel Cross-calibration report, drat v 1. 0 (HERSCHEL-HSC-REP-1935)
Spectral Overlaps HIFI – PACS: 1360 -1900 GHz. Red leakage 1360 -1550 GHz PACS – SPIRE: 1360 -1550 GHz SPIRE – HIFI: 1400 -1550 GHz & 490 -1250 GHz PACS HIFI SPIRE HIFI – PACS: 157 -220 mm. Red leakage 190 -220 mm PACS – SPIRE: 193 -220 mm SPIRE – HIFI: 193 -213 mm & 240 -616 mm Diagnostic lines in routine cross-calibration programmes CO 16 -15 CO 10 -9 CII CO 13 -12 CO 8 -7 CO 6 -5
Cross Comparisons: Use Cases Spectral line fluxes Continuum fluxes HIFI observations with fast chop and continuum timing options enabled Single line measurements of point sources (or sources of known small size) Single line measurements of extended sources Line spectroscopy + single pointing Line spectroscopy + Mapping Broad range measurement of point sources Broader range + single pointing . . . see presentations by Peter Imhof and Ivan Valtchanov
Spectral line fluxes Continuum fluxes HIFI observations with fast chop and continuum timing options enabled Single line measurements of point sources (or sources of known small size) Single line measurements of extended sources Line spectroscopy + single pointing Line spectroscopy + Mapping Broad range measurement of point sources Broader range + single pointing . . . see presentation by Elena Puga
Spectral line fluxes Continuum fluxes HIFI observations with fast chop and continuum timing options enabled Single line measurements of point sources (or sources of known small size) Single line measurements of extended sources Line spectroscopy + single pointing Line spectroscopy + Mapping Broad range measurement of point sources Broader range + single pointing . . . see presentation by Pierre Royer and Elena Puga. Narrow overlap limits the exercise.
Cross Calibration Source Sample New list of common Calibration Monitoring Sources after Cross-calibration Proposal (Sep 2011): Name Alternative names RA (J 2000) Dec (J 2000) v. LSR (km/s) f 160 (Jy) AFGL 2688 V 1610 Cyg, Egg nebula 21: 02: 18. 78 +36: 41. 20 -34 488 CRL 618 V 353 Aur, Westbrook nebula 04: 42: 53. 64 +36: 06: 53. 40 -22 196 NGC 7027 HD 201272 21: 07: 01. 59 +42: 14: 10. 20 +25 90 NGC 6302 HD 155520, Bug nebula 17: 13: 44. 21 -37: 06: 15. 90 -40 400 Additional sources belonging to the HIFI Calibration source monitoring programme (most expensive in time) Name Alternative names RA (J 2000) Dec (J 2000) v. LSR (km/s) f 160 (Jy) IRC+10216 CW Leo, Peanut nebula 09: 47: 57. 38 +13: 16: 43. 70 +26 610 VY CMa HIP 35793, AFGL 1111 07: 22: 58. 33 -25: 46: 03. 20 +21 137 R Dor HIP 21479 04: 36: 45. 59 -62: 04: 37. 80 +7 32. 7 IK Tau IRC+10050, NML Tau 03: 53: 28. 89 +11: 24: 21. 88 +34 27. 6 o Ceti Mra 02: 19: 20. 79 -02: 58: 39. 50 +46 35. 2 EP Aqr HD 207076, AFGL 2806 21: 46: 31. 85 -02: 12: 45. 90 -34 4. 14
Cross Calibration Plan: Observation strategy Materialized in a Spectrometer Cross-calibration Proposal: Total of 32. 7 hours of observing time for cross-calibration purposes Regular coordinated monitoring of CCMs Completion of inter-instrument comparison of additional sources PACS Range Spec HIFI CO 6 -5 433. 56 CO 8 -7 325. 2 CO 10 -9 260. 24 CO 13 -12 200. 27 CO 16 -15 162. 8 CII 157. 74 156 --219 Line Spec CO 16 -15 162. 8 Line Spec CII 157. 74 SPIRE HR or CR Spec 197. 0— 313. 0 303. 0— 672. 0 Position/pointing. Extended source corrections?
Goals Ø Consistency Ø Feedback to models and better calibration through them Ø Determination of clear problem areas in standard processing Ø Specific: • PACS-S red leak using SPIRE/HIFI spectra • HIFI continuum – which modes really do give accurate continua?
- Slides: 9