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JCMT call-for-proposals for semester 15B

  • 작성자 : KASI
  • 작성일 : 2015-04-29
  • 조회수 : 1837
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(1) Available Instrumentation and Observing Modes

The current status and availability of the JCMT instrument suite is here.


Continuum Receivers

ㅇSCUBA-2 (simultaneous 450µm & 850µm imaging)

 

Heterodyne Receivers – General overview

ㅇRxA3 (211-272 GHz) – has a single receptor.
ㅇHARP (325-375 GHz) – is a 16-element B-band array.

Heterodyne Backend

ㅇACSIS – Available bandwidths, spectral resolutions and backend modes.

The ACSIS correlating spectrometer is a highly flexible backend; it was designed to work with HARP, but it works with all our heterodyne receivers.

Several modes of heterodyne observing and several switching schemes are supported. See also the Instrumentation summary from the January Workshops

 

(2) Calculating Integration Times

Integration time calculators or formulae are available, for

ㅇHeterodyne receivers : HITEC (the Heterodyne Integration TimE Calculator),
ㅇSCUBA-2 ( Formulae)

They should be used to calculate the integration time needed to reach a given RMS per channel or beam or output-map pixel as a function of receiver, frequency, observing mode, elevation and sky opacity.

The JCMT Observing Tool (JCMTOT) gives equivalent results for all instruments.

Overheads for pointing, focussing, and calibrations should not be added to the time request. These activities will be accounted for separately. Calibration observations (eg. focus, pointing, flux calibrators) and other unavoidable overheads (eg receiver tuning) are no longer charged to science projects and instead are charged to an observatory accounting code. There is therefore no need for applicants to provide calibration overhead estimates in their proposals.The observatory will perform regular and appropriate calibration observations to ensure that all science data obtained are sensibly calibrated.

Spectroscopically, this involves observations of one of our Spectral Line Standards at one of about ten different standard line frequencies . If your programme frequency is one of these, then you’re decidely in luck. In any case, the calibration allows you to assess the performance of the instrument. We will perform such an observation at least once per programme unless a previous calibration is still appropriate, and more often if circumstances change or if more than a couple of hours pass.

For continuum work, continuum calibrators will be observed at both operational wavelengths of SCUBA-2 (450µm, 850µm) at appropriate times and airmass to meet the general needs of the science programmes.

If a proposal demands more unusual or more frequent calibrations then this needs to be clearly stated in the proposal and the time for these calibrations requested explicitly. If you have queries about what our default calibrations might be or what extra overheads are generated by your calibration requirements please get in touch with us.


(3) Proposal Submission

Northstar is now available for submissions. All users are advised to register, check and/or update their accounts. As mentioned in our Help page, you may, at first, have to accept the server certificate to gain access to Northstar. Except for the University of Hawaii, all proposals should be submitted HERE.

If you already have a Northstar account you can login now! – new users should first register. Applicants should avoid using font sizes that are excessively small.

 

It is important that all applicants (PI & CoIs) and their national affiliations are listed on the proposal, so that an assessment can be made of how much observing time is being used by each partner organization. We suggest that you edit your Northstar profile to include, eg


      REMARK : Affiliation = China (or Japan or Taiwan or Korea or UK or Canada)


(4) Flexible Scheduling

The overall philosophy of observing at JCMT is to match observing programmes to the weather. A summary was given at the January Workshops and new guidelines will appear here soon.


(5) The JCMT Users e-mail exploder:

From time to time, subscribers to the ‘jcmt_users’ email list will receive notices on the status of the JCMT, call for proposals, etc. To subscribe, please send email to jcmt_users-join@eaobservatory.org (no particular Subject or content is required).


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