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| ##acl hermelo,NicolasBillot,CarstenKramer,SamuelLeclerc:read,write,delete,revert,admin Default ##http://www.iram.es/IRAMES/mainWiki/Continuum/PoolPreparation |
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| '''[[ http://www.iram.es/IRAMES/mainWiki/GISMO/Main | Go back to the GISMO Main Wiki ]]''' | '''Go to the [[http://www.iram.es/IRAMES/mainWiki/Continuum/GISMO/Main|GISMO]] |[[http://www.iram.es/IRAMES/mainWiki/NIKA/Main|NIKA]] page.''' |
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| Note that your project will '''NOT''' be observed in case you do not send your observing instructions to the GISMO pool manager before the begin of the pool. | Note that your project will '''NOT''' be observed in case you do not send your observing instructions to the GISMO & NIKA Pool Manager before the begin of the pool. |
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| ||[[attachment:README_078-13.txt]]||[[attachment:catalog_078-13.sou]]||[[attachment:setup_078-13.pako]]||[[attachment:observe_NGC4449.pako]]|| | ||[[attachment:README_199-14.txt]]||[[attachment:setup_199-14.pako]]||[[attachment:199-14.sou]]||[[attachment:observe_NGC4449.pako]]|| |
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| You can download these example scripts and adapt them to your project. If you have questions please contact the GISMO pool manager. | You can download these example scripts and adapt them to your project. If you have questions please contact the pool manager. |
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| It is possible to select pointing sources nearby to your science targets using [[http://www.clearskyinstitute.com/xephem/ | XEphem]] and the [[attachment:pointingIRAM30m.edb | IRAM 30m catalog of pointing sources]]. The ongoing IRAM flux monitoring program provides [[http://www.iram.es/IRAMES/FluxMonitoring/PointingSources/plotPointingSources.html | flux estimations ]] for most of these pointing sources. These data are provided ONLY to help in the planning of observations, in particular to select pointing and focus sources at the IRAM 30-m telescope. They should not be used for any other purpose. |
It is possible to select pointing sources nearby to your science targets using [[http://www.clearskyinstitute.com/xephem/ | XEphem]] and the [[http://www.iram.es/IRAMES/mainWiki/Continuum/Calibrators | IRAM 30m Catalog for Continuum Cameras]]. |
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| Two different total power mapping modes are offered: | We offer two standard observing modes where data are taken continuously while the telescope follows either Lissajous curves, or zig-zag patterns. Neither mode makes use of the secondary mirror to modulate the signal. Lissajous patterns are very efficient for point source observations as the target stays on-array at all times during the scans (map size ~1'). We have noticed however that the '''strong telescope accelerations generated by the Lissajous scanning pattern produce some systematic noise at medium-to-large spatial scales (>20") in the reconstructed maps'''. While we are investigating the possibility to mitigate this extra noise (hardware and/or software), we currently consider the '''Lissajous observing mode not suitable for mapping extended emission'''. Instead the traditional zig-zag scanning pattern should be used for mapping extended emission or covering large areas (up to 30'x30'). |
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| * '''On-the-fly mode:''' Data are taken while the telescope follows a traditional zig-zag pattern. This mode is appropriate for large maps. It is necessary to specify the size of the map (in arcminutes) and the position angle (in degrees) measured North through West. For example, for a 6'x12' on-the-fly map rotated 25 degrees launch the '''[[attachment:gismo_onthefly.pako | gismo_onthefly]]''' script with the following parameters: | The syntax of the two observing modes offered is the following: * '''On-the-fly mode:''' It is necessary to specify the size of the map in both axis, the position angle and the tilt angle of the scanning direction (both measured '''anticlockwise'''), and the coordinate system (radec or azel). For example, for a 6'x12' on-the-fly map, a position angle of 25 degrees, a tilt angle of 0 degrees, and equatorial coordinate system, type: |
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| PAKO> @ gismo_onthefly 6 12 25 | PAKO> @ cont_onthefly 6 12 25 0 radec |
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| * '''Lissajous mode:''' Data are taken while the telescope follows a Lissajous curve pattern. Lissajous maps are square shaped. For example, for a 3'x3' Lissajous map launch the '''[[attachment:gismo_lissajous.pako | gismo_lissajous]]''' script with the following parameters: | * '''Lissajous mode:''' Lissajous maps are square shaped and the coordinate system is always horizontal. Therefore, the only parameter needed is the amplitude of the Lissajous pattern. For example, for a 3'x3' Lissajous map, type: |
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| PAKO> @ gismo_lissajous 3 | PAKO> @ cont_lissajous 3 |
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| Lissajous curves give a better noise distribution than the classical OTF maps, but they cannot be used in maps larger than 4'x4'. If observers need larger maps, they should use on-the-fly maps or make mosaics with smaller Lissajous maps. For deep field integrations, both Lissajous or on-the-fly maps could be used. | ## Lissajous curves give a better noise distribution than the classical on-the-fly maps, but they cannot be used in maps larger than 4'x4'. For larger maps it is necessary to use on-the-fly mode or make mosaics with smaller Lissajous maps. For deep field integration, both Lissajous or on-the-fly maps could be used. |
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{{attachment:ObservingModes.png}} |
{{attachment:ObservingModes.png | Observing Modes | width=600}} |
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| == Obsolete scripts == | |
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| Fully tested scripts from previous runs are also available within the '''~/PaKo/obs/''' folder. The following list shows how to launch some of the most ''popular'' obsolete scripts: {{{ PAKO> @ obs/gismo_lissajous_tiny1min PAKO> @ obs/gismo_lissajous_tiny2min PAKO> @ obs/gismo_lissajous_tiny5min PAKO> @ obs/gismo_lissajous_tiny10min PAKO> @ obs/gismo_lissajous_2mx2m PAKO> @ obs/gismo_lissajous_3mx3m PAKO> @ obs/gismo_lissajous_4mx4m PAKO> @ obs/gismo_otf_6mx6m PAKO> @ obs/gismo_otf_8mx8m PAKO> @ obs/gismo_otf_10mx10m PAKO> @ obs/gismo_otf_30mx30m }}} ----- Author: Israel Hermelo (GISMO pool manager) |
Author: Israel Hermelo ([[http://www.iram.es/IRAMES/mainWiki/Continuum/GISMO/Main|GISMO]] &[[http://www.iram.es/IRAMES/mainWiki/NIKA/Main|NIKA]] Pool Manager) |
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| Created: 2013.10.25 | Created: 2013.OCT.25 |
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| Last update: 2013.10.25 | Last update: 2014.OCT.16 |
Pool preparation
From our experience, the chances of success of a program are higher if it is scheduled in a pool than in the traditional way of dedicated observing blocks. This is due to the flexibility of pooled observations with respect to demand on weather quality and equipment availability. It is therefore advantageous for any project to participate in these pooled observing sessions. Participation is of additional interest for low rated proposals which may otherwise not be scheduled. Astronomers with little or no experience are welcome as observers at the IRAM 30m radiotelescope.
Scripts preparation
Pooled observations should be fairly simple and straightforward to observe. Note that your project will NOT be observed in case you do not send your observing instructions to the GISMO & NIKA Pool Manager before the begin of the pool. It is highly recommended to use the standard scripts provided by the IRAM staff:
You can download these example scripts and adapt them to your project. If you have questions please contact the pool manager.
Pointing Sources
It is possible to select pointing sources nearby to your science targets using XEphem and the IRAM 30m Catalog for Continuum Cameras.
Observing modes
We offer two standard observing modes where data are taken continuously while the telescope follows either Lissajous curves, or zig-zag patterns. Neither mode makes use of the secondary mirror to modulate the signal. Lissajous patterns are very efficient for point source observations as the target stays on-array at all times during the scans (map size ~1'). We have noticed however that the strong telescope accelerations generated by the Lissajous scanning pattern produce some systematic noise at medium-to-large spatial scales (>20") in the reconstructed maps. While we are investigating the possibility to mitigate this extra noise (hardware and/or software), we currently consider the Lissajous observing mode not suitable for mapping extended emission. Instead the traditional zig-zag scanning pattern should be used for mapping extended emission or covering large areas (up to 30'x30').
The syntax of the two observing modes offered is the following:
On-the-fly mode: It is necessary to specify the size of the map in both axis, the position angle and the tilt angle of the scanning direction (both measured anticlockwise), and the coordinate system (radec or azel). For example, for a 6'x12' on-the-fly map, a position angle of 25 degrees, a tilt angle of 0 degrees, and equatorial coordinate system, type:
PAKO> @ cont_onthefly 6 12 25 0 radec
Lissajous mode: Lissajous maps are square shaped and the coordinate system is always horizontal. Therefore, the only parameter needed is the amplitude of the Lissajous pattern. For example, for a 3'x3' Lissajous map, type:
PAKO> @ cont_lissajous 3
![[ATTACH]](/Continuum/PoolPreparation?action=AttachFile&do=upload_form&ticket=00681e4f5a.06f9942489baf4e2b9599010543ecbaaa2ed5a83&target=ObservingModes.png "[ATTACH]"){kind=small}
Author: Israel Hermelo (GISMO &NIKA Pool Manager)
email: hermelo@iram.es
Created: 2013.OCT.25
Last update: 2014.OCT.16