PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 The SPIRE Photometer and its Observing Modes Bernhard Schulz (NHSC/IPAC)

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Presentation transcript:

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 The SPIRE Photometer and its Observing Modes Bernhard Schulz (NHSC/IPAC) on behalf of the SPIRE ICC, the HSC and the NHSC

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 Your SPIRE Workshop Team 2 NHSC-SPIRE / IPAC Bernhard Schulz Nanyao Lu Joan Xie Kevin Xu Lijun Zhang

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 Contents SPIRE Introduction SPIRE Science examples SPIRE Instrument basics –Footprint, focal plane geometry, wavelength coverage Photometer observing modes (AOTs)AOTs 3

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 The SPIRE Instrument 4 PSW PLW PMW SSW SSWSSW Imaging Photometer Simultaneous observation in 3 bands 139, 88, and 43 pixels Wavelengths: 250, 350, 500  m /  ~ 3 FOV 4' x 8', beams 17.6'', 23.9'', 35.1'' Imaging Fourier Transform Spectrometer Simultaneous imaging observation of the whole spectral band 37 and 19 pixels Wavelength Range: ,  m (447 – 989 GHz, 959 – 1545 GHz) Resolution: 24.98, 7.207, GHz Circular FOV 2.0' diameter, beams: 17-21'', 29-42''

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 SPIRE Scan Map Observations SPIRE mapped about 11% of the sky in 6917 scan map observations. 833 parallel mode, 1880 large maps, 4204 small maps 5 This plot contains only central target coordinates, not areas covered.

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 SPIRE Science Examples 6

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 GOODS-North as seen by SPIRE 7 SCUBA

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct Riechers, D.A. et al., A dust-obscured massive maximum- starburst galaxy at a redshift of Nature, 496(7), pp.329–333.

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct Riechers, D.A. et al., A dust-obscured massive maximum-starburst galaxy at a redshift of Nature, 496(7), pp.329– 333. Comparison of HFLS3 with Arp220 and the Milky Way: Much larger dust and gas masses at comparable stellar masses. In HFLS3 40% of the baryonic mass is in the ISM. SFR > 2000 times that of the Milky Way already at only 880 Mil years after Big Bang.

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 Investigation of dust heating in M81, M83 and NGC 2403 Using MIPS 70  m, PACS  m, SPIRE  m data, 1.6  m 2MASS and H  CCD images. 70/160  m ratios strongly influenced by SFRs. Emission > 250  m from cold component that is rather unaffected by SF but more by the total stellar population. Impact on radiative modeling. Bendo et al. 2012, MNRAS 419, M81 70/160  m 160/250  m 250/350  m 350/500  m

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 HiGal Survey |b|<1deg covered by square tiles, scanned in two directions. Covering entire Galactic plane. 11

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 Dwarf Planet Makemake 12 Lim et al. 2010, A&A 518, L148 Difference of two observations of dwarf planet Makemake that were made 44 h apart on 01-Dec Thanks to the proper motion of the object it appeared as a pair of negative and positive images with fluxes: F(250  m) = 9.5+/-3.1mJy F(350  m) = 7.1+/-1.8mJy This technique beats very efficiently confusion noise (~6mJy).

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 Instrument Details 13

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 Bolometer Arrays Projected on the Sky 14 Photometer Spectrometer Overlapping beam profiles as projected on the Sky. +Z (to Sun) +Y 8’ 4’ Beams: 18.3” x 17.0” 24.7” x 23.2” 33.4” x 35.1” Beams: 16.8”..21.1” 37.3”..42.0” 2’ Feedhorn arrays Circles in diagrams to the right show FWHM of detector beam profiles

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 SPIRE in the Herschel Focal Plane 15

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 SPIRE Wavelength Coverage 16 Complementary to PACS PhotometerSpectrometer

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 Photometer AOT 7 point jiggle (point source) 7-point jiggle for point source photometry, to compensate pointing error and under- sampling. Chopping and nodding at each jiggle position. 126” chop + nod single step ~ 6” small mapscan (large) map Scan map at speeds of 30 and 60 ”/sec is most efficient mode for large-area surveys. Parameters are optimized for full spatial sampling and uniform distribution of integration time. Cross scan capability (84.8 o ) Overlap region 348” 42.4 o Scan Single cross scan at 84.8 o replaces Jiggle map. Scan map at speeds of 30 and 60 ”/sec. Full spatial sampling in center of scans o Scan Fully sampled region ~4’ 17 Some observations exist in the archive but were never used for standard observation programs.

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 Parallel Mode SPIRE and PACS SPIRE Geometry Considerable redundancy for SPIRE due to smaller scan distance needed by PACS arrays. Sample rate lowered from 18 to 10Hz. Overlap region 155” orth. 168” nom o Scan SPIRE PACS Geometry Even field coverage for PACS. Additional frame averaging needed to keep data rate down. Blue array frames are averaged by additional factor two compared to PACS only mode. Overlap region 155” orth. 168” nom o Scan PACS Scan maps at speeds of 20 and 60”/sec with PACS and SPIRE active in parallel are useful for large-area surveys. The distance between PACS and SPIRE apertures is 21 arcmin. Two almost orthogonal (84.8 o ) directions for cross scanning are available. 18

PACS Hitchhiker’s Guide to Herschel Archive Workshop – Pasadena 6 th - 10 th Oct 2014 Examples for Photometer End Products 19 BD RCW 120R Oph L1712 Level 2 Point Source MapsLevel 2 Extended Source MapsLevel 2.5 Extended Source Maps Small Scan Obs. Large Scan Obs. Two Parallel Mode Obs. PSW PMW PLW single observation two observations