This site requires javascript to be enabled to fuction correctly


RSS Feed
Knowledgebase : General ALMA Queries
     
Since Cycle 2, the ALMA calibrator database is accessible at the ALMA Science Portal [1]. It provides a history of flux densities at given frequencies and angular structure information or limits for more than 700 sources. In addition, processed data...
Raw ALMA data files include autocorrelation outputs from the antennas which do not have atmospheric or instrumental effects subtracted. In principle, a well-modeled astronomical source could be subtracted from the autocorrelations, leaving the atmosphe...
A new feature that has been requested from the users has finally come to the helpdesk! You can now reply to your open tickets via email. When you get a notification of a reply to your helpdesk ticket, you can now hit reply in your email client instea...
Yes! you can submit a ticket to EA ARC in Japanese. EA ARC では日本語のチケットも受け付けます。日本語での質問・要望に対しては、原則として日本語で回答します。
As stated in Section 2.2 of the ALMA Cycle 4 Proposers Guide [1], "A paragraph describing the potential for publicity of the proposed observation is no longer required. Instead, the data delivered for successful observations will include contact inform...
There is no difference in the feathering process between the Solar and other observations, except for the case that the field of view is very near the solar limb (< the diameter of the primary beam). For the limb observations, you might need to apply the ...
For a full description of the proposal selection process, see the ALMA Cycle 4 Proposers Guide [1]. Proposals will be assessed on the overall scientific merit of the proposed investigation and its potential contribution to the advancement of scienti...
The ALMA calibrator databasecan be directly queried through a web form at http://almascience.org/sc [1]. Alternatively, you can query the ALMA calibrator database from the OT in this way: - Open up the OT and create a Science Goal (or use an existi...
As of Cycle 4, PI's (and people delegated by the PI - see Knowledgebase Article: _\"As PI of an ALMA proposal, how can I give others access to the data during the proprietary period?_ [1]_"_) can sign up to receive email notification of certain activit...
ALMA can actually point at the Sun (although solar observations are not yet available). Small grooves or etchings in the antenna surface are designed to ensure that sunlight is not reflected to the secondary subreflector, and observations of the Sun have ...
Please note first the limitations of ALMA observations: * The longest duration of one scheduling block (SB) is 2 hours. * Every SB includes a calibration session before starting scientific observation. The duration of the session is 25~30 minute...
The ALMA Science Portal allows users to link their ALMA accounts to an account at a trusted institution. This can be done on the Science Portal profile page [1], by clicking on the "Account linking" tab. Trusted institutions are currently limited to ES...
You can use the OT to retrieve your current and any previously submitted ALMA proposals that you are PI or Co-I on. Use the OT commands: File=>Open Project=>From Archive, and search based on your ALMA username or proposal ID. If your username and p...
The ALMA Snooping Project Interface (SnooPI) is a read-only web application that allows Principal Investigators (PIs) to follow their ALMA projects from the moment of acceptance all the way to data delivery. SnooPI is available at http://almascience.or...
When you request an observation with single-pointing, the time cadence of images is limited by the integration time of the 64-bits correlator. Since the integration time is set to 2 seconds in Cycle4, the highest time cadence is 2 seconds. When you reques...
In each Science Goal, sources are selected in one of two ways: by specifying a rectangular field, or by specifying individual positions, with or without offsets. Each involves some restrictions. A Cycle 3 proposal may contain up to a total of 150 po...
For interferometric observations, the highest time resolution is set by the shortest correlator dump time. In so-called time division mode (TDM), the correlator can output every 16ms (though at reduced spectral resolution), so you can Nyquist sample a 32m...
If not completed by the end of the cycle, Cycle 3 projects assigned grade A will be carried over to Cycle 4. The relative ranking of projects in Cycle 4 will proceed as follows (see Section 5.3.1 of the Cycle 4 Proposers Guide [1]): a. Cycle 3 "A" ...
Cycle 4 observations will be scheduled during nighttime in 16 h shifts and three to four days a week during daytime, interrupted by periods of engineering and computing activities as well as execution of tasks associated with optimization and further ...
The order ALMA is hoping to add new bands is as follows: * Band 5 is expected on or after 2017 once its ALMA Development construction project is completed. * Band 1 receivers are currently being planned as part of an ALMA Development Project and may ...
Yes. Submitted project proposals may include principal investigators (PIs) and co-investigators (Co-Is) who are not affiliated with any of the three ALMA Executive regions.
If a user selects the "Choose a Solar System Object" option (SSO) in the OT Field Setup, the OT sets the position to RA=0deg, Dec=0deg. However the OT time estimate depends on the declination of the observed source, as described in Section 9.1.1. o...
Seven observing bands will be available for Cycle 3 and 4 observations. They are designated bands 3, 4, 6, 7, 8, 9 and 10. The nominal frequency & wavelength ranges are: Band Frequency Range Wavelength Range (GHz) (mm) 3 84-116...
The Cycle 4 duplication guidelines are published at http://almascience.org/proposing/call-for-proposals/duplications [1], the duplication criteria are published in Section 5.4 of the Cycle 4 Proposer's guide [2] document and section 5.2 and appendix A ...
When you submit a helpdesk ticket, notification is sent to triage staff at your affiliated ALMA Regional Center (ARC). Triage staff will assign the ticket to the appropriate staff person within the ARC and a reply will be sent within two working days. ...
Large Programs may designate any number of co-PIs, who share the overall responsibility with the PI in conducting the proposed science, however only the PI has the responsibility for SBs preparation and approval, and the delivery of the data products i...
Publications making use of ALMA data must include the following statement in the acknowledgement: "This paper makes use of the following ALMA data: ADS/JAO.ALMA#[Project code] . ALMA is a partnership of ESO (representing its member states), NSF (USA)...
There are two contributions to the position error of your target. The first is the error in the position of the phase calibrator. Most ALMA calibrators have VLBI positional accuracy, so this will likely result in an offset of less than 1 milliarcsecond...
The Atacama Compact Array (ACA), also known as the Morita Array, is composed of twelve closely spaced 7-meter antennas (7-m Array), and four 12-meter antennas for single dish observations (Total Power Array). The array is designed to enhance wide-field im...
If you have CASA information, tips, or tricks to share with the ALMA or CASA communities please submit it to the NRAO Science Forum. This could include tips on using CASA, scripts or modules that extend CASA's functionality, questions about installing ...
As of October 2013, tests of bandpass stability are underway in Bands 3, 6, and 7, using four different spectral window bandwidths in each case. These results should be more definitive than previous test results (described below) now that a significant...
The voltage pattern assumed by CASA (≤ version 4.3.1) for the ALMA 12-m primary beam is currently hard coded to a uniformly illuminated 10.7-m dish with 0.75m blockage, resulting in an Airy disk whose FWHM is SIMILAR to a 12m Gaussian illumination with...
The spectral resolution of ALMA data will be two times the channel spacing, as the data will be Hanning smoothed by default, when no channel averaging is set in the Observing Tool (OT) by the proposers. The OT reports the number of Hanning-smoothed spe...
Users of any professional background, nationality or affiliation may submit an ALMA proposal. All proposals are reviewed without regard to the nationalities or affiliations of the investigators. Successful projects will have their observing time ass...
The selection process for projects is explained in Proposers Guide [1]. Proposals will be assessed on the overall scientific merit of the proposed investigation and its potential contribution to the advancement of scientific knowledge. ALMA is sche...
The ALMA Regional Center (ARC) websites are: Europe: http://www.eso.org/sci/facilities/alma/arc.html [1] North America: https://science.nrao.edu/facilities/alma [2] East Asia: http://alma.mtk.nao.ac.jp/e/index.html [3] Links: ------ [1] http://w...
The details of the Atacama Compact Array (ACA) are found in the ALMA Technical Handbook [1]. Links: ------ [1] http://almascience.org/proposing/call-for-proposals/technical-handbook
For Early Science data packages (ALMA Cycles 0-3), the images that are included in the data delivery package may not include all spectral windows, or all channels, or all targets that were observed as part of the science program. These images are meant...
Help Desk Software by Kayako Resolve