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|작성자 : 한국천문학회||등록일시 : 2021-01-08 14:38:27|
CALL FOR PROPOSALS
GLOBAL 3mm VLBI ARRAY
Deadline: 1 February 2021
VLBI proposals for observing at 3mmwavelength (86 GHz) using:
the VLBA, GBT*, EFFELSBERG, PICO VELETA, NOEMA, ONSALA,
METSAEHOVI, YEBES and KVN telescopes should be submitted by
1 FEBRUARY 2021 (UT 22:00)
Successful proposals will be considered forscheduling in GMVA
Session II 2021 (30 September - 4 October) orin a later session.
* SEE ALSO THE SECTION BELOWREGARDING PROPOSALS FOR GMVA
* OBSERVATIONS TOGETHER WITHPHASED-ALMA IN ALMA CYCLE 8
| ALL PROPOSALSSHOULD BE SUBMITTED USING |
| THE NRAOPROPOSAL SUBMISSION TOOL (PST): |
In order to maximize the sensitivity for continuumobservations
the GMVA will record at the highest bitratewhich instrumentation
and resources permit. Currently all telescopeswill record at
4 Gbps (except the KVN, which will record in acompatible 1 Gbps
mode). All data will be correlated atthe Bonn DiFX software
* The GBT may be included in GMVA observationsif a sufficiently
compelling justification is given in theproposal but the amount
of time available will be reduced compared toearlier observing
semesters, and observing blocks greater than 6hours will be
very difficult to schedule.
ALMA, the KVN and the Greenland Telescope(GLT) can be selected using
the "Other Stations" text field inthe PST. Rules for requesting the
participation of the Mexican LMT in GMVAobservations are given
in a separate section below.
Note that the availability of NOEMA (PLATEAUDE BURE) for GMVA
Session II in 2021 and later sessions is notconfirmed.
For further details on proposing, includingthe possibility of
additional support observations at 7mm (43GHz), please consult
the administrative and technical informationhosted at the MPIfR:
PARTICIPATION OF ALMA IN GMVAOBSERVATIONS IN ALMA CYCLE 8
Due to the Corona virus pandemic, ALMA wasunable to observe
together with the GMVA for observationsscheduled for GMVA
Session I in 2020 (ALMA Cycle 7). Theseobservations are now
re-scheduled for GMVA Session I in 2021.
ALMA is expected to re-issue a call forproposals for Cycle 8
in March 2021. Successful proposals will bescheduled in
GMVA Session I 2022. New GMVA+ALMA proposalsfor ALMA Cycle 8 must
be submitted by the GMVA February 2021deadline, and separately
to ALMA by the ALMA 2021 deadline.
GMVA+ALMA proposals which were alreadysubmitted to the GMVA in
February 2020 for ALMA Cycle 8 have beenreviewed by
the GMVA observatories (but not by ALMA) andwill be held
over (with their grades) for possiblescheduling in
GMVA Session I 2022. A separate proposal toALMA for these projects
needs to be submitted following the (new) ALMACall for
Cycle 8 proposals in March 2021. SeeCycle 8 pre-announcement at:
Proposers may, instead, submit a revisedversion of their GMVA+ALMA
proposal to the GMVA by the February 2021deadline,
which will then be re-evaluated by the GMVAobservatories.
Proposers should give the code number of theearlier proposal
which is superseded.
Proposals which have already been submittedwill, of course,
compete with any new GMVA+ALMA proposalssubmitted at the
February 2021 deadline.
Restrictions on GMVA+ALMA proposals in ALMACycle 8
GMVA observations with ALMA will be limited toa fixed recording
mode, which currently provides 4 Gbps on allbaselines.
The KVN telescopes will not be available inthis mode.
Only VLBA telescopes will be available at 7mmin this mode.
Direct phasing up of the ALMA array is limitedto sources with a
correlated flux density of >500 mJy withinan unresolved core on ALMA
baselines of up to 1 km. Direct phasing-up onthe target source
("active" phasing) thus limits thestrength of the target.
For weaker sources (<500 mJy), Cycle 8 willintroduce the option of
"passive" phasing. In this mode, theALMA array is periodically phased up
on a bright calibrator source close in angulardistance to the
science target. There will be no restrictionson the flux density of
science targets using passive phasing (asidefrom SNR considerations
on VLBI baselines). However, the phasingcalibrator properties must meet
the same criteria as for actively phasedobservations, and it is
recommended that the calibrator lie within anangular separation of no
more than 5 degrees from the science target.
Proposers must specify any such calibrator intheir proposal; consult
the ALMA calibrator catalogue: https://almascience.eso.org/sc/
In order to make a clean linear-to-circular polarisation
transformation of ALMA recordings, any targetsource must be
observed for a duration of at least 3h (breaksfor calibrators
permitted) to sample a range of parallacticangles.
Large Programs (>50 hours of observingtime) are not permitted
because phased ALMA is a non-standard mode.
No long-term programs may be proposed, and noproposals will be
carried over into the next cycle.
There is a cap for VLBI of 5% of ALMA Cycle 8observing time. As
time for GMVA observations will thus bescarce, proposals should
include a quantitative justification as to whyALMA is essential
for the goals of the project.
PARTICIPATION OF THE LMT IN GMVAOBSERVATIONS
The Mexican LARGE MILLIMETER TELESCOPE ALFONSOSERRANO (LMT) may
be available to participate in some GMVAobservations.
For this a SEPARATE PROPOSAL must be submittedto the LMT
with a P.I. from the LMT community, asdescribed under
Time is allocated to the community as follows:
- Mexico 68.25%
- Uni. Massachusetts Amherst 15%
- USA (rest) 15%
- Spain 1.75% (15h per session)
The P.I. of this LMT proposal need not be theleader (i.e., P.I.) of
the GMVA proposal, but must agree to takeresponsibility for all
necessary arrangements for observing at theLMT, and must be identified
in the GMVA proposal.
The proposal should emphasize the value andimportance of adding
the LMT to the GMVA observations.
NOTE that the LMT proposal deadline forobservations in both
GMVA SessionII 2021
AND GMVA Session I 2022
is in April/May 2021 (i.e. before the August 2021GMVA proposal deadline).
|이전글||Complete JKAS issues of 2020|
|다음글||[vlbi] EVN Call for Proposals: Deadline 1 February 2021 at 16:00 UTC|