HIFI: CASCA07 – lunch meeting 6 June, 2007 1 Herschel Lunch Meeting Agenda 1.HIFI overview (10...

HIFI: CASCA07 – lunch meeting6 June, 2007

1

Herschel Lunch Meeting Agenda

1. HIFI• overview (10 min) - Mike Fich• instrument status, testing (5 min) Doug Johnstone• key projects and other science (10 min.) Doug and

perhaps other members of Science Team? • user software and support(10 min.) Carolyn McCoey

2. SPIRE (30 min.) - David Naylor


2

Canadian Participation in HIFI

• provide instrument subsystem – Local Oscillator Source Unit

• provide two people for Instrument Control Centre (ICC)– software development and support– one person (Kevin Edwards) located at ICC (Groningen) and

one at U.Waterloo (Carolyn McCoey)

• four members of international Science Team• significant involvement in at least one Key Project

(1000-2000 hours observing time)

• Guaranteed Time in proportion to our investment• one person on the international HIFI Steering Committee


3

Top Level Requirements and Resulting Concept

HIFI Implementation:Heterodyne spectroscopy

– single pixel on the sky– very high spectral resolution

• 7 dual-pol mixer bands– 480-1250 GHz (625-240 m) 5x2

SIS mixers, IF 4-8 GHz

– 1410-1910 GHz(212-157 m; 2x2 HEB mixers, IF 2.4-4.8 GHz

• 14 LO sub-bands– LO source unit in common– LO multiplier chains

• 2 spectrometer systems;– for each polarisation

- auto-correlator spectrometer- acousto-optical spectrometer

HIFI designed for: - Spectral Scans and Spectral

line surveys- Very high spectral resolution- Widest possible coverage in the

unexplored FIR/Submm range

1. Frequency coverage:480 – 1250 GHz (625-240 m)1410 – 1910 GHz (212-157 m)

2. SensitivityNear-quantum noise limit

sensitivity• IF bandwidth/Resolution:

- 4 GHz (in 2 polarisations)- 140 – 280 kHz –0.5 and 1

MHz3. Calibration Accuracy: 10%

baseline; 3% goal


4

HIFI Band SensitivitiesBand

1 2 3 4 5 6 & 7Frequency Range (GHz) 480-640 640-

800800-960

960-1120

1120-1250

1410-1910

Tsys (K) 160 320 480 730 2000 2500Flux Limit (5, 1hr, R=104) (Jy) 2.3 4.0 5.5 8.0 20 22Flux Limit (5, 1hr, R=104) (mK) 5 9 12 17 43 45Line Flux limit (5,1hr, 104) (10-

18 Wm-2)1.3 3 5 8 24 34

Beamwidth (arcsec) 39 30 25 21 19 13Spectral Resolution (MHz) 0.14 – 0.28 – 1.00

testing currently underway - values may change


5

HIFI-HRS (auto-correlator) FM Capabilities

2 HRS FM modules


6

WBO (AOS) FM (one Polarisation)with 1.1 MHz resolution and 4GHz bandwidth


7

HIFI Key Programswith possible Open time Key projects (*)OVERVIEW: (with coordinator’s name)

1. Water and Chemistry Studies in the Solar System (P. Hartogh and E. Lellouch)

2. The Star Formation Program1.1 WATER (E. van Dishoeck)1.2 Spectral Scans (C. Ceccarelli)1.3 The Orion and Sgr B2 regions (T. Bergin)(1.4 Maps of the ORION region (J. Cernicharo))*(1.5 Molecular Oxygen (P. Goldsmith))*

3. ISM2.1 The Warm ISM (V. Ossenkopf)2.2 Hydrides and Molecular Carriers ( M. Gerin)

4. Late stages of Stellar Evolution (V. Bujarrabal)3.1 WATER and CO observations of AGB envelopes, PPNe and PNe(3.2 HIFI frequency surveys of AGB, PPNe and PNe; coord. Pardo)*

5. Extragalactic Science (R. Guesten)4.1 Physical and Chemical Conditions of the ISM in Galactic Nuclei4.2 The Physics of the ISM in Low-Metallicity Environments*


8

Updated Herschel Observing Proposal AO Timeline

• AO KP (GT and OT) issue 1 February 2007• KP GT proposal deadline 4 April 2007• KP GT result official 5 July 2007• KP OT proposal deadline 25 October 2007• KP OT result official 28 February 2008• AO ‘regular’ GT cycle 1 issue 28 February 2008• AO ‘regular’ GT cycle 1 deadline 3 April 2008 • GT result official 5 June 2008• Launch 31 July 2008• OT cycle 1 issue 1 February 2009 (?)• OT cycle 1 deadline 1 May 2009 (?)• OT cycle 1 observing 1 Aug 2009 (?)


9

Canadian HIFI Steering Committee

• Michel Fich* (University of Waterloo)

Canadian Lead Co-Investigator• Doug Johnstone* (NRC/HIA)• Peter Martin* (University of Toronto)• Henry Matthews (NRC/HIA/DAO/DRAO)• Bill McCutcheon (University of British Columbia)• Rene Plume* (University of Calgary)

* “Astronomy Co-Investigator” - member of the international HIFI Science Team

Other Canadians currently active in HIFI: Kevin Edwards (U.Waterloo/ICC), Carolyn McCoey (U.Waterloo), Martin Houde (U.Western Ontario), Li-Hong Xu (U.New Brunswick)


10

Canadian HIFI strategy is to maximize success rate on Open Time Proposals

• Canadian staff and Science Team members available as a resource to all Canadian astronomers to help with

– proposals preparation

– observing assistance

– data analysis advice

– software support

• Canadian HIFI Workshop for potential users in 2007(?)

http://astro.uwaterloo.ca/HIFI

email: [email protected]

http://astro.uwaterloo.ca/HIFI

mailto:[email protected]


11

Intermediate Mass Protostars (30 hrs)

Doug Johnstone -> co-ordintator, prep. work, planning

Mike Fich -> water line modeling

Rene Plume -> chemistry, prep. work

Asuncion Fuente-> prep. work, planning

Ewine van Dishoeck -> prep. work, obs. planning

Paola Caselli -> prep. work, obs planning

others?


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Polarisation studies with Herschel/HIFI

• Each of the 7 bands have a pair of orthogonally linear polarised mixers (SIS or HEB)

• Three Stokes parameters (I,Q,U) can be evaluated with two (or three) measurements– Successive measurements can only be performed weeks apart

– Different analysis techniques than commonly used


17

Polarisation component orientations for each channel

Courtesy W. Jellema


18

Polarisation studies with Herschel/HIFI

• Team lead by M. Harwit (mission scientist), including M. Houde, W. Jellema, G. Melnick, K. Menten, and D. Neufeld

• Initial program will concentrate on masers– Potential for high linear polarisation levels– Many spectral lines (i.e., water) predicted

• If successful, expand to other types of observing programs

Recruiting graduate student talk to me!

Martin Houde ([email protected])

HIFI: CASCA07 – lunch meeting 6 June, 2007 1 Herschel Lunch Meeting Agenda 1.HIFI overview (10...

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