ALMA Primer
ALMA Primer
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Sidebands, Basebands and Spectral Windows: Practical Examples for Spectral Line Observing
In this video we continue our look at sidebands, basebands and spectral windows, and will explore some practical examples of ALMA tuning setups when spectral line observing is your primary science goal. We’ll also look at some common issues you may encounter.
Переглядів: 89

Відео

Band 7 Single Continuum tuning options
Переглядів 512 місяці тому
This companion video to "Sidebands, Basebands and Spectral Windows: Practical Examples for Continuum Observing" shows the power of using the single continuum observing mode with high spectral resolution for serendipitous discovery. This is a short, un-narrated extract from the video, suitable for use in presentations and teaching.
Sidebands, Basebands and Spectral Windows: Practical Examples for Continuum Observing
Переглядів 6312 місяці тому
In this video we continue our look at sidebands, basebands and spectral windows, with practical examples of how to set up observations where continuum imaging is the primary science driver of your proposal. We have a stand-alone extract from this video at ua-cam.com/video/iTjpWwht_2k/v-deo.htmlsi=Hqn4H-qW8V4ifqeN
ALMA Primer Videos: Sidebands, Basebands and Spectral Windows; Part 1: Principles & Components
Переглядів 2653 місяці тому
In this instalment, we'll learn about Sidebands, Basebands and Spectral Windows: what they are and how they are created, and their power and limitations.
ALMA Primer Video Series: An Introduction to Self-Calibration
Переглядів 33710 місяців тому
In this instalment, we look at Self-Calibration, how it works, and how and when to use this powerful technique that can significantly improve the dynamic range of your images.
ALMA Primer Series: Multi-scale Cleaning
Переглядів 7202 роки тому
In this installment, we talk about multiscale cleaning, where we supplement the delta function components used by the regular CLEAN algorithm with wider components that better model extended emission. Keywords: multi-scale; clean components; ALMA Observatory; Atacama Large Millimeter/Submillimeter Array Have you seen the rest of the ALMA Primer Series? ua-cam.com/play/PL7RYrDLalw-yZ18mQrvnxwHQS...
ALMA Primer Series: CLEAN Masking
Переглядів 4712 роки тому
This installment of the series tackles the topic of Clean masking, where we restrict the areas in a dirty image or residual where the CLEAN algorithm can assign components. Intro to CLEAN: ua-cam.com/video/fF3KetPUyFE/v-deo.html Keywords: clean bias; clean components; clean mask; auto-multithresh; ALMA Observatory; Atacama Large Millimeter/Submillimeter Array Check out the rest of the ALMA Prim...
ALMA Primer Series: Introduction to CLEAN
Переглядів 1,4 тис.2 роки тому
In this video, we take a look at why interferometric images need to be deconvolved, and the ubiquitous CLEAN algorithm, used and improved for decades to perform this deconvolution. This video covers the basic concepts of CLEAN and how the algorithm works. In other videos, we will talk about more advanced cleaning concepts, such as masking and weighting. Some useful resources: CASA Tclean imagin...
ALMA Primer Series: Intro to Calibration
Переглядів 5412 роки тому
In this video, we explore the fundamentals of calibrating interferometric data: why calibration data are needed, how they are obtained, and how they are used to calibrate your data. Keywords: phase calibration; flux calibration; bandpass calibration water vapour; system temperature; ALMA Observatory; Atacama Large Millimeter/Submillimeter Array Check out the rest of the ALMA Primer Series: ua-c...
ALMA Primer Series: Image and Cell Size
Переглядів 6652 роки тому
In this installment, we tackle image and cell size; two of the most important parameters when imaging. We talk about field of view, the relationships between image and U-V plane parameters, and show some of the consequences of poor choices, such as aliasing. Keywords: field-of-view; primary beam; mosaic; image plane; uv plane; resolution; ALMA Observatory; Atacama Large Millimeter/Submillimeter...
Aliasing Animation
Переглядів 4982 роки тому
This video is taken from an animation in our Image and Cell size video. It visually shows the consequences of undersampling with a two point-source example. Check out the main video: Don't forget to check out the rest of the ALMA Primer Series: ua-cam.com/play/PL7RYrDLalw-yZ18mQrvnxwHQSYEqwGuwE.html
Image/U-V Plane Parameters Animation
Переглядів 2902 роки тому
This is a standalone, qualitative animation about how Image and Cell size affect everything to do with the Image and UV grids. For a more thorough explanation, watch the full Image and Cell Size Video: and be sure to check out the full ALMA Primer Series! ua-cam.com/play/PL7RYrDLalw-yZ18mQrvnxwHQSYEqwGuwE.html Feel free to use this animation for your own demonstrations, but please credit the AL...
ALMA Primer Series: Largest Angular Scale and Maximum Recoverable Scale
Переглядів 5082 роки тому
In this installment, we discuss the topics of Largest Angular Scale and Maximum Recoverable Scale. With any interferometer, the angular resolution you can achieve depends on distance between the furthest apart antennas, but the antennas which are closest together will limit how large an object you can detect. This video will explain why. Keywords: Largest angular scale; maximum recoverable scal...
ALMA Primer Series: Estimating ALMA Sensitivity Using Single Dish Data
Переглядів 4322 роки тому
ALMA Primer Series: This video explains how you can use single dish data (like from the JCMT, APEX, IRAM, etc.) to estimate the sensitivity you'll need when writing an ALMA proposal. It also tells you roughly how to convert between antenna temperatures and flux densities. Keywords: Jansky; Antenna temperature; flux density; beam; aperture efficiency; beam filling; ALMA Observatory; Atacama Larg...
Weighting in Imaging: 4 Panel Animation
Переглядів 1172 роки тому
This is a repeating version of the 4 panel graphic that appears in the Weighting in Imaging video of the ALMA Primer Series. It is intended to be used to contemplate the tradeoffs discussed without narration/music, or to be used for demonstrations during presentations. Feel free to use this so long as you credit the ALMA Primer Series! Keywords: uniform weighting; natural weighting; Briggs weig...
ALMA Primer Series: Weighting in Imaging
Переглядів 8512 роки тому
ALMA Primer Series: Weighting in Imaging
An Introduction to Radio Interferometry (Legacy OVRO Video)
Переглядів 3,4 тис.2 роки тому
An Introduction to Radio Interferometry (Legacy OVRO Video)

КОМЕНТАРІ

  • @anais5378
    @anais5378 20 днів тому

    This scene represents the distribution of coverage by antennas. Does this u-v plane map correspond to the distance and angles of the antennas in three-dimensional space?

  • @brian_kirk
    @brian_kirk Місяць тому

    Please keep doing these! :)

    • @almaprimer920
      @almaprimer920 28 днів тому

      Many thanks! We'll be producing more early in the new year, on calibrating polarization data and on how ALMA receivers work.

  • @billynomates920
    @billynomates920 2 місяці тому

    i don't know about this but it's great you are helping people who want to. comment to boost you in the algorithm!

    • @DrGHMS
      @DrGHMS 2 місяці тому

      Thanks! Our goal is primarily to teach astronomers how to use the ALMA Observatory, but this isn't you I still hope you manage to get something out of them.

  • @cooksoni.a
    @cooksoni.a 2 місяці тому

    i couldn't tell if this was a video on FM synthesis or science, the 2 types of videos i watch on youtube

    • @DrGHMS
      @DrGHMS 2 місяці тому

      The primary audience for this video series is optical/infrared astronomers who may not be familiar with radio interferometry concepts but who want to use the ALMA Observatory for their science. We hope to provide basic interferometry concepts, observing and data reduction guidance, and so on, in relatively short, easy-to-watch segments. As a secondary goal we hope that our videos will be used as a supplement to undergraduate/graduate astronomy and physics courses. Try watching our (vintage) intro to interferometry video to get some context for the rest of the series.

  • @yaroslavsobolev9514
    @yaroslavsobolev9514 2 місяці тому

    At last, I'm beginning to understand why the merchant starship of the sentient plants in Vernor Vinge's "Fire upon the Deep" book was named "Out of Band II."

  • @maxfine3299
    @maxfine3299 3 місяці тому

    Glory to ALMA

  • @strowera
    @strowera 3 місяці тому

    I would be very grateful if you made a video about the differences between imaging the continuum and molecular lines ^^

    • @almaprimer920
      @almaprimer920 3 місяці тому

      We are working on two "practical examples" videos, one where continuum is the primary goal and one where spectral lines are the focus, and plan on releasing them this summer.

  • @AdrianBoyko
    @AdrianBoyko 4 місяці тому

    Is Dale Gary the grandfather of 3 Blue 1 Brown? This video was super helpful.

    • @almaprimer920
      @almaprimer920 4 місяці тому

      I'm afraid I have no idea what (or who) "3 Blue 1 Brown" is. It's a delightful and insightful video that we decided could not be improved upon, so we asked for (and received) permission to include it in this series.

    • @AdrianBoyko
      @AdrianBoyko 4 місяці тому

      @@almaprimer920 3B1B is a UA-camr who produces educational math videos with stunning visuals. I’m just complimenting Dale’s work.

    • @almaprimer920
      @almaprimer920 4 місяці тому

      @@AdrianBoyko Thanks! I'll have to check that out. Always interested in new visualization ideas.

  • @maxfine3299
    @maxfine3299 4 місяці тому

    Thanks ALMA your in my top fav of radio telescope arrays

    • @almaprimer920
      @almaprimer920 4 місяці тому

      Thanks, Max! We're working on more videos; expecting to release three or four new ones this summer.

  • @ROVKS1
    @ROVKS1 5 місяців тому

    very informative, thank you very much

  • @platovsky
    @platovsky 9 місяців тому

    ASTOUNDING ❤❤❤

  • @farahhatimumtahana8013
    @farahhatimumtahana8013 9 місяців тому

    Thanks for the video.. Currently, I am learning CASA,.. Do you have contact/email to ask for help with CASA?

    • @almaprimer920
      @almaprimer920 9 місяців тому

      Hi! I would suggest you use the ALMA Helpdesk off of the Science Portal (help.almascience.org) or the NRAO Helpdesk (help.nrao.edu). Both NRAO and ESO run workshops from time to time. You can find out about those through the Helpdesk as well.

  • @ScottHoltshousen
    @ScottHoltshousen 10 місяців тому

    much needed! Thanks

  • @lluvik2450
    @lluvik2450 Рік тому

    Im also so glad they decided to make these vids

    • @almaprimer920
      @almaprimer920 Рік тому

      Many thanks! We are working on completing another two or three videos this fall. The first will be on self-calibration.

    • @lluvik2450
      @lluvik2450 Рік тому

      @@almaprimer920 that would be cool

  • @lucasmarquis4530
    @lucasmarquis4530 Рік тому

    Thanks for your videos! I beg you, explain this clearly, in depth, how are done the correlations of the pairs of antennas!

    • @almaprimer920
      @almaprimer920 Рік тому

      Thanks, Lucas. We are actively working on the next batch of videos during the fall. I'll take your suggestion about explaining how correlations are done to the working group.

    • @lucasmarquis4530
      @lucasmarquis4530 Рік тому

      @@almaprimer920 thank you so much !

    • @almaprimer920
      @almaprimer920 9 місяців тому

      That would be a good idea for its own video. Thanks for the suggestion!

    • @lucasmarquis4530
      @lucasmarquis4530 9 місяців тому

      @@almaprimer920 Happy to read that the working group is motivated by this part too! When will it be made and published :p ?

    • @almaprimer920
      @almaprimer920 9 місяців тому

      @@lucasmarquis4530 That I can't predict. We aim to produce 2-3 videos per year; one is due for release in the next couple of months and two others are in various stages of completion. I'll ask around to see if there's anyone at NRAO who's interested in roughing out a script.

  • @brian_kirk
    @brian_kirk Рік тому

    Please keep doing these! :)

    • @almaprimer920
      @almaprimer920 Рік тому

      Thanks, Brian. We are actively working on the next batch of videos. The first one will be on self-calibration, hopefully done within a month or two.

  • @gregghallinan
    @gregghallinan Рік тому

    That is not Dale Gray, but the excellent Dale Gary and he is still the best in the business at doing radio interferometry of the sun.

    • @almaprimer920
      @almaprimer920 Рік тому

      Many thanks, Gregg, for catching that. I'll fix that right away.

  • @gokhan5911
    @gokhan5911 2 роки тому

    For understanging radio interferometry visualing is very helpfull. I hope Dr. Dale Gray. is live . Thanks for sharing .