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ALMA Data Reduction Training Day: November 27, 2023

On Monday, November 27, 2023, we will host an ALMA Data Reduction Training Day in-person in HL 111.

The training will begin at 9:30 AM and continue into the afternoon with coffee breaks and an hour lunch break. The Allegro team will be presenting a series of talks that cover the following topics: how to go from the archive to obtaining calibrated visibilities, overview for calibration and self-calibration, imaging, analysis tools and visualizing data with CARTA. There will be sufficient time for Question & Answer at the end of each talk.

Several of the talks will include a hands-on component that participants can follow along with. Information on how to connect to the Allegro workstations will be provided prior to the training day to the registered participants.

Registration is now closed!

Program* November 27, 2023
9:15-9:30 Welcome
9:30-10:15 Aida Ahmadi ALMA data: From the archive to calibrated visibilities
10:15-10:45 Violette Impellizzeri Overview of calibration and self-calibration
10:45-11:05 Coffee break
11:05-11:15 Aida Ahmadi Introduction to CASA + technical setup
11:15-12:15 Monica Huang Imaging & tclean
12:15-13:15 Lunch break
13:15-14:00 Monica Huang Imaging & tclean
14:00-14:30 Coffee break
14:30-15:30 Alex Hygate Analysis tools
15:30-16:30 Aida Ahmadi Intro to CARTA

* Note that this is a rough schedule as we plan to dedicate plenty of time for questions after each session.

Directions to Leiden Observatory

Note that this is not the old observatory in the center of Leiden. Instructions on how to get to Leiden Observatory, including transportation from Schiphol Airport or the central trains station, can be found here. Note that these instructions specify the route to the Lorentz Center, which is in the building on the right in the photo below (Oort building). The event will be held in the joining taller building –  Huygens building. Leiden Observatory is located on the 4-5th floors of both buildings, and the Allegro offices are located on the 11th floor of the Huygens building.

Locations inside the building

Workspaces reserved for the ALMA Data Reduction Training Day on November 27, 2023 are located in room HL-111 on the 1st floor of the Huygens building. There is a reception at the entrance of the building where they can provide you with directions.


Netherlands ALMA+JWST Joint Science Day

Allegro is pleased to announce the first ALMA+JWST Joint Science Day, which will take place on January 30th, 2024, at Kapteyn Astronomical Institute in Groningen. We would like to invite all members of our communities to present your latest scientific results obtained with ALMA and/or JWST. A particular emphasis will be given to projects combining both instruments, but not exclusively, depending on demand. We invite contributions on the synergies with other facilities too. During the Science Day, we will also have talks related to ALMA and JWST technical aspects, news and outlook. The meeting will include ample time to discuss user experiences and related topics.

Invited speakers:

  • Karina Caputi (Kapteyn Astronomical Institute)
  • Łukasz Tychoniec (Leiden Observatory)
  • Martin Zwaan (ESO)
  • Nicolas Crouzet (Leiden Observatory)

To register, please fill in this registration form.

Abstract submission deadline: Monday January 8, 2024

ALMA Cycle 10 Statistics

The ALMA cycle 10 proposal submission statistics again saw some new records. The number of overall submitted proposals for all arrays was 1679 – with 91 as ACA stand-alone projects and 44 large programs (compared to 40 large programs in Cycle 9).  Even though the total number of submitted proposals is lower than for the previous two cycles (1769 proposals in Cycle 9) the overall time requested actually surged again, with over 29,000 hours requested on the 12-m array. The region that saw the highest number of proposals submitted was (again) Europe with a request of 12,177 hours on the 12-m array, also now withstanding the highest oversubscription (8.4), followed by North America (9196 hours, oversubscription of 6.4) , East Asia (5940 hours, oversubscription of 6.2) and Chile (1508 hours, oversubscription of 3.5).  The percentages of proposals for the 12-m array per region, science category, and requested receiver band for regular (top) and large programs (bottom) are shown in the figure below.


The percentage of proposals for the 12-m array per region, science category, and requested receiver band for regular programs.

The percentage of proposals for the 12-m array per region, science category, and requested receiver band for large programs.


A novelty of Cycle 10 was the introduction of Joint proposals, which resulted in a great success for the observatory: there were 26 proposals submitted to ALMA jointly with JWST, 10 with VLA and another 10 with the VLT, of which 3 proposals requested time in 2 or more partner observatories. 

The final accepted list of proposals contained four large programs (in the categories of planetary science, high-mass star formation, and galaxies (mid- and high-redshift), four joint proposals for which ALMA is the main observatory (with the VLA and JWST), and six VLBI proposals. Despite the high oversubscription, the statistics for the Netherlands were also positive, with 15 PI  proposals accepted (for 36 submitted) and a much wider 96 proposals accepted as collaborators. Of the 7300 hours requested for the 12m array, ~ 3200 hours were awarded in Category 1 (High-z Universe), ~1600 hours in Category 2 (Galaxies), ~850 hours in Category 3 (Star Formation), ~1400 hours in Category 4 (Disks) and finally ~300 hours were awarded in Category 5 (Stars). 

You can find more information about the ALMA Cycle 10 statistics at this link:

ALMA at 10 years: Past, Present, and Future

The ALMA partnership is organizing a conference to commemorate 10 years of ALMA Science Observations, taking place in Puerto Varas, Chile, on 4-8 December 2023. The aim of the conference is to look back on the observatory’s accomplishments, highlight the latest ALMA results from all scientific fields, as well as look forward to future technical developments. The latter will include a focus on its ambitious 2030 development roadmap and in particular the ongoing plans for the Wideband Sensitivity Upgrade that will ultimately quadruple the system bandwidth and improve observing efficiency and sensitivity for both continuum and spectral line observations. 

The conference will have a hybrid format and while in-person attendance has reached capacity and is closed, on-line participation, including posters, is open until November 1, 2023 (register for online attendance here). 

For more information, visit the conference website:

Lorentz Workshop: Tuning to the high frequency ALMA Universe

In the week of September 4-8, an ALMA-dedicated workshop will take place at the Lorentz Center in Leiden.  The workshop aims at gathering the ALMA community to discuss and further develop the unique science that can be achieved at the highest frequencies offered (Bands 8, 9, and 10).  ALMA is the only ground-based interferometer that can routinely observe at frequencies > 350 GHz, making it a truly unique instrument. At the workshop, we aim to discuss the status of high frequency observations for galactic and extragalactic science and to explore which questions have arisen in the field that can be answered with high frequency observations. We will also discuss future developments, technologies, and the ALMA upgrade. The overall goal is to create new ideas, collaborations and synergies within our community and the observatory that will enhance the discovery space of ALMA.

The workshop will be attended by 50 participants from several relevant scientific areas from all ALMA regions, the executives and the Joint ALMA observatory. 

For more information visit:

IAU I-HOW Radio Astronomy Workshop

A joint Iran and Türkıye radio astronomy workshop is set to take place at Erciyes University in Kayseri in Türkıye in the next two weeks (Sep. 4-15). The workshop is part of the IAU Hands-On Workshops (I-HOW) initiative that aims to train young scientists in developing countries in accessing, analyzing and using the vast amounts of astronomical data currently available in archives for their research projects. The workshop will focus on teaching students and young researchers how to analyze radio data from arrays such as VLA, ALMA, MeerKAT, and LOFAR. The two-week workshop will provide ample time for lectures, tutorials, scientific talks of a wide range of topics, and hands-on projects. The students are also given an opportunity to present their own scientific works and request assistance on their own projects from the team of lecturers. Experts from Allegro as well as the Italian and UK ALMA Regional Centre Nodes will be at the workshop training students on how to access, calibrate, image, and analyze ALMA observations. For more information, see the website of I-HOW Radio Astronomy Workshop.

Science Highlight: All quiet at z=4.5

Standard galaxy formation models expect that young galaxies should be highly turbulent and kinematically chaotic, as a result of violent gas accretion and frequent mergers. Observations appear to tell a very different story. In this paper, Roman-Oliveira (Kapteyn Institute), Fraternali and Rizzo (2023, MNRAS 521, 1045) show archival ALMA data of the [C II] 158 micron line of five galaxies at z ~ 4.5 at 0.1-0.2 arcsec resolution (~1 kpc). All these galaxies show clear velocity gradients in the [C II] line. Four of these can be explained as rotationally supported disk, and only one is a likely unresolved merger. Turbulent velocities are low, showing that quiescent disks are common even at z ~ 4.5. This paper also shows that the high resolutions offered by ALMA are essential to separate the quiescent disks from localized kinematic features such as inflow/outflow. It also illustrates the potential for discovery through publicly accessible ALMA archival data, even for previously published data that were never interpreted together.


Figure: Observed and modeled velocity patterns of ALMA archival [C II] line emission of the five galaxies at z~4.5 studied by Roman-Oliveira et al. (2023).

First fringes for the ALMA Band-2 pre-production receivers

Over the next few years, ALMA will open up the 2.6-4.5 mm wavelength range for scientific observations with its slew of newly developed Band 2 receivers. The first three Band-2 ‘pre-production’ receivers were recently installed at ALMA, developed and built by the NOVA submillimeter group at the University of Groningen together with GARD/Chalmers University, Sweden, INAF Italy, NAOJ Japan, the University of Chile, and ESO. ‘First fringes’ were obtained with this set of receivers, marking the moment when ALMA opens its eyes at these wavelengths. [more information]

ALMA Proposal Preparation Day 2023

The Allegro ALMA Regional Centre node is organising a proposal preparation workshop on Thursday the 20th of April 2023 in advance of the upcoming ALMA proposal deadline (expected to be the 10th of May 2023). We would like to invite you to attend online or in person at Leiden Observatory.

The workshop will have two sessions:

  1. Morning (10:00 – 12:00): Introduction to writing and preparing ALMA proposals.
  2. Afternoon (13:00 – 14:00): Summary of new features and changes in Cycle 10.

The morning session will introduce attendees to writing and preparing ALMA proposals. The topics covered will include the dual anonymous review process, distributed peer review, accessing the ALMA archive and using the ALMA Observing Tool (OT) to prepare your observing programme. No prior ALMA experience is necessary for attendance.

The afternoon session will cover the differences between Cycle 10 and Cycle 9. In particular, we will highlight the new capabilities of ALMA in this cycle, including the new ALMA Band 1 and the new availability of joint proposals with JWST, the VLA and the VLT. The afternoon session is designed for returning ALMA users and is also suitable for attendees of the morning session.

Both sessions will have time for your questions, and tea, coffee and biscuits will be provided for in person attendees. You can register to attend online or in person for one or both of the sessions before Thursday, April 13, 2023 using our registration form. For more information about the expected dates and what will be on offer in Cycle 10, please see the ALMA Cycle 10 Pre-announcement

In addition to this proposal preparation day, you can request a meeting with the Allegro staff (e-mail us) to discuss your proposal or come to our drop-in sessions (April 24, May 1, and May 8 at HL-1122 from 14:00-16:00).

Program April 20, 2023 (Tentative)
10:00-12:00 Introduction to Proposal Preparation (slides) (GOB/EM1.09) Allegro Team
12:00-13:00 Lunch
13:00-14:00 ALMA’s New Capabilities in Cycle 10 (slides) (GOB/EM1.09) Allegro Team
Directions to Leiden Observatory

The address of Leiden Observatory is Niels Bohrweg 2, 2333 CA Leiden. Note that this is not the old observatory in the center of Leiden. Instructions on how to get to Leiden Observatory, including transportation from Schiphol Airport or the central trains station, can be found here. Leiden Observatory is located on the 4-5th floors of the Oort building (seen on the right in the photo below), and the Huygens building (the taller building seen on the left in the photo below). Allegro offices are located on the 11th floor of the Huygens building.

The workshop will take place in room EM 1.09 in the New Gorlaeus building. We will have signs and there is also a reception at the entrance of the building where they can provide you with directions.

For those joining us online, connection details will be sent to you by email before the start of the event.



Useful resources: