The alma observing preparation tool
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The ALMA Observing Preparation Tool. NRAO / North American ALMA Science Center. Video versio ns of this material:. Click here. Registering with User Portal. To register for the user portal, go to either: http://almascience.org/ http://almascience.nrao.edu/ (saves one step)

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The ALMA Observing Preparation Tool

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The alma observing preparation tool

The ALMA Observing Preparation Tool

NRAO / North American ALMA Science Center


The alma observing preparation tool

Video versions of this material:

April 26, 2011


The alma observing preparation tool

April 26, 2011


The alma observing preparation tool

Click here

April 26, 2011


The alma observing preparation tool

April 26, 2011


The alma observing preparation tool

Registering with User Portal

  • To register for the user portal, go to either:

    • http://almascience.org/

    • http://almascience.nrao.edu/ (saves one step)

  • Go to the User Portal to access:

    • ALMA info and news

    • Call for Proposals

    • ALMA tools and documentation

    • Helpdesk

    • Project Tracker

    • ALMA Science Archive

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The alma observing preparation tool

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Launch the application

Launch the Application

A couple of dialog boxes will pop up

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The alma observing preparation tool

  • Hover over these icons to get help

  • New Proposal (Phase I)

  • Open project from Archive

  • New Phase I Science Goal…

  • Sensitivity Calculator …

  • Help!

Contextual help on proposal workflow

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The alma observing preparation tool

Tips

  • Be alert to the presence of sliders, some information may be off-screen

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The alma observing preparation tool

Tips

  • Stippled edges can be dragged to resize panes

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The alma observing preparation tool

Tips

  • Arrowheads maximize and minimize panes

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A walk through of a simple example

A walk through of a simple example

  • Observe molecular gas in NGC 1097

  • Use CO (1-0) emission line

    • Rest frequency: 115.2712 GHz

    • Band 3 (2.6 mm)

  • Size of NGC 1097 is 9’ x 6’

  • The field of view for a single pointing at 115 GHz is ~ 45”

  • Single pointing of the nucleus

    • During ES, up to 50 pointing mosaics are allowed.

Synthesized beam w/400m baseline

NGC 1097 from S4G, Sheth et al. 2010

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The alma observing preparation tool

Proposal Preparation Workflow – Using the Contextual help

Click through the tabs and follow the instructions on the left.

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The alma observing preparation tool

Fill out these relevant fields

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The alma observing preparation tool

Fill out these relevant fields

Proposal Title

Abstract

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The alma observing preparation tool

Fill out these relevant fields

{

Click here to set PI and co-Is

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The alma observing preparation tool

Type in the name or username

An error may pop up

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The alma observing preparation tool

Finding Help

  • If you get stuck on any step, look for the “?” Icon

  • Click on it to get help.

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The alma observing preparation tool

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The alma observing preparation tool

Attaching the Sci / Tech Justification…

…as a single PDF file

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The alma observing preparation tool

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The alma observing preparation tool

At any point you can check whether your proposal passes validation

Validation is required before proposal can be submitted

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The alma observing preparation tool

Click on this turn-key to continue

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The alma observing preparation tool

Press on Science Goal tab to create a science goal

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The alma observing preparation tool

What is a Science Goal in the OT?

  • A science goal is:

    • One correlator / front end setup in one ALMA band

      • spectral windows, rest freq, polarization products, line/continuum modes

    • Subject to one set of control parameters

      • spatial resolution, sensitivity, dynamic range

    • Using one mapping strategy

      • Mosaic or single-pointing

    • And one calibration strategy

      • User or system-defined

    • Applied to an arbitrary set of sky targets (field centers)

      • Each with its own LSR velocity

    • In ES all windows in one science goal must have the same bandwidth and channel spacing

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The alma observing preparation tool

Describe your science goal if you wish – for the technical assessors (not required)

Enter in Source name

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The alma observing preparation tool

Make sure and double check the coordinates.

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The alma observing preparation tool

Check the velocity used -> observing frequency.

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The alma observing preparation tool

Click on Spatial Tab to visualize observations

Red text indicates incorrect or missing value

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The alma observing preparation tool

Clicking here opens the visualizer panel

Press Query to get the image from pre-loaded servers

- or -

Load your own image* (Galactic coordinates won’t work yet)

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The alma observing preparation tool

Placing beams on an image

(the graphical method)

Enter frequency

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The alma observing preparation tool

For Calibration Set up: Unless you have a strong reason for choosing User-defined calibration, then leave this as System-defined calibration.

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The alma observing preparation tool

Currently supported modes for Cycle 0

Press here to add a line

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The alma observing preparation tool

e.g. Type in “CO”

A window that can search Splatalogue will open.

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The alma observing preparation tool

Double click on the transition

Now, the line list will be limited to those that can be observed at same time!

Transition moves into this window

Press here to accept selection

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The alma observing preparation tool

Your chosen Line is now loaded into the Setup:

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The alma observing preparation tool

Click on Spectral Tab to visualize observations

Atmospheric transmission

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The alma observing preparation tool

LO

CO line

Band 3

LO Range

Sidebands

Press here to change resolution

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The alma observing preparation tool

Select correlator mode

Trade-off between bandwidth & resolution

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The alma observing preparation tool

Can add up to 4 spectral windows – must have same resolution and bandwidth in Cycle 0

Location of windows is constrained

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The alma observing preparation tool

Summary:

A very versatile tool with lots of options

Note that the colors can be changed from the Preferences:

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The alma observing preparation tool

Request the resolution and sensitivity you need for your Science Goal

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The alma observing preparation tool

Back to our example of NGC 1097

To get a 10σ detection on the faintest emission in the map requires ~10 mJy/beam in a 10 km/s channel.

The ALMA correlator gives 1.275 km/s channels; we will bin 8 channels to get to 10 km/s.

So required sensitivity in one correlator channel

~ 10 mJy/bm * sqrt (8)

~ 28 mJy/beam

Nobeyama maps of NGC 1097 (Kohno et al. 2003)

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The alma observing preparation tool

Back to our example of NGC 1097

1.4”~ 110pc

Sufficient to resolve the ring

Press here to get an idea of how long it will take to do this

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The alma observing preparation tool

  • ALMA with 16 x 12m antennas is very fast!

  • BUT be aware that your UV-coverage may not be ideal – we recommend that you use simdata to check

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The alma observing preparation tool

Back to our example of NGC 1097

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The alma observing preparation tool

Time allocation for the proposal will be the Total Estimated time.

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The alma observing preparation tool

Validation Step

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The alma observing preparation tool

List of problems…

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The alma observing preparation tool

See also: “known issues”

http://almasw.hq.eso.org/almasw/bin/view/OBSPREP/Cycle0KnownIssues

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The alma observing preparation tool

almascience.nrao.edu

science.nrao.edu/alma

The Atacama Large Millimeter/sub-millimeter Array (ALMA), an international astronomy facility, is a partnership of Europe, North America and East Asia in cooperation with the Republic of Chile. ALMA is funded in Europe by the European Organization for Astronomical Research in the Southern Hemisphere (ESO), in North America by the U.S. National Science Foundation (NSF) in cooperation with the National Research Council of Canada (NRC) and the National Science Council of Taiwan (NSC) and in East Asia by the National Institutes of Natural Sciences (NINS) of Japan in cooperation with the Academia Sinica (AS) in Taiwan. ALMA construction and operations are led on behalf of Europe by ESO, on behalf of North America by the National Radio Astronomy Observatory (NRAO), which is managed by Associated Universities, Inc. (AUI) and on behalf of East Asia by the National Astronomical Observatory of Japan (NAOJ). The Joint ALMA Observatory (JAO) provides the unified leadership and management of the construction, commissioning and operation of ALMA.

April 26, 2011


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