Allegro’s newest members are postdocs Pascal Keller and Joshiwa van Marrewijk!

Pascal Keller joined Allegro in May 2024. He did his PhD titled “Investigating the Epoch of Reionisation with Radio Interferometers” at the Cavendish Astrophysics group of the University of Cambridge. His research focuses on developing and applying non-standard analysis techniques to radio interferometric data. He is particularly interested in using calibration-insensitive closure invariants such as the “closure phase” to search for the redshifted 21 cm signal of neutral hydrogen during the Epoch of Reionisation (EoR). As part of his thesis, he applied the “closure phase method” to data from the Hydrogen Epoch of Reionization array (HERA), producing robust upper limits on the spatial fluctuations of the EoR signal.

Joshiwa van Marrewijk will join Allegro in October 2024. He did his PhD at ESO in Garching, titled “The birth of cosmic structures as revealed by observations in the (sub-)mm bands”. His research focuses on how galaxies and galaxy clusters form, particularly at two key moments in cosmic history: the epoch of reionization and protoclusters. During his PhD, Joshiwa developed innovative methods to analyse ALMA data in the uv-plane and created a novel simulation tool named maria used for forecasting bolometric single-dish observations and studying phase fluctuations caused by the ever-changing atmosphere.  While his work often reveals the challenges of pushing observations to extreme redshifts, it’s also paving the way for the next generation of (sub-)mm astronomy and provides useful tools to analyse to get the best science out of the observations.

Meanwhile, we said good-bye Dr. Ko-Yun (Monica) Huang this summer. We would like to express our gratitude to Monica for her amazing service at Allegro! We will miss her greatly, and wish her all the best on her new path!

 

Lastly, we are excited that Dr. Violette Impellizzeri will join ASTRON as head of the Astronomy & Operations department. She started her new duties at ASTRON on 1 September 2024, but will still be working at the Allegro ARC Node partially until March 2025, to enable a smooth transition for the new group, new arrivals and daily activities. At ASTRON, Violette will be closely involved in the commissioning efforts for LOFAR2.0, the deployment of the SKA Dutch regional center and astronomy research activities at the institute.

Violette  has been part of ALMA since 2011, when she relocated to the Joint ALMA Observatory (JAO) in Chile as a commissioning postdoc and science fellow. Her involvement during the commissioning phase included early VLBI testing, science verification, and the implementation of high-frequency observing techniques, also known as band-to-band phase transfer. As operations commenced in 2014, she assumed the role of an operations astronomer with added responsibilities such as leading the Phase II Group (P2G), serving as a liaison for VLBI activities (VLBI friend of telescope), and heading the Proposal Handling Team (PHT). In October 2020, she joined the Allegro ARC Node in Leiden as the Program Manager, providing assistance to the ALMA community in the Netherlands.

Moving to ASTRON, Violette said she hopes she can help create further synergies and collaborations among our frequency domains in the coming years, as we are living through a transformation with the exciting WSU upgrade matching the ongoing constructions of SKA and the LOFAR 2.0 observatory.

In July the European ARC network set up a booth at the annual European Astronomical Society (EAS) meeting, where conference participants could pick up a variety of ALMA related stickers, watch an informative video about ALMA and the ARC network, or enjoy a casual chat with one of the ARC representatives. This was a great opportunity for the ARC network to promote its services to the astronomy community and spread excitement about ALMA science and developments.

The ALMA Cycle 11 proposal submission statistics set some new records! Although the number of overall submitted proposals seems to be stabilising with 1712 proposals this semester, the number of hours requested on the 12-meter array continues to increase each cycle with over 30000 hours requested this cycle. The region with the highest number of proposals submitted was (again) Europe with a request of 11946 hours on the 12-m array, leading to the highest oversubscription of any region (over 8). East Asia and North America both had oversubscriptions of about 6.5, and Chile saw a big jump up in oversubscription which is now over 5. Band 6 remained the most popular this cycle, and Band 1 was requested by about 10% of proposals in its debut cycle.

The percentages of proposals for the 12-m array per region, science category, and requested receiver band for regular proposals are shown in the figure below.

42 large programs were submitted, of which four were awarded: two in the Circumstellar Disks, Exoplanets, and the Solar System category; and two in the Cosmology and High Redshift Universe category.

In Cycle 11, 60 proposals were submitted from the Netherlands. From these, 16 were accepted with an A, B or C rating. Worldwide, Netherlands-based astronomers were involved in 103 accepted proposals representing close to 2000 hours of ALMA time. This includes 16 researchers as PI and 106 individuals as co-I.

More details on the submission statistics can be found here.