The conference “Two in a million” - The interplay between binaries and star clusters will be held at ESO Garching, Germany, between 11-15 September 2023. Both in-person and online participation will be possible. Please note that the list of invited speakers has been updated.

The deadline for submission of abstracts has been postponed to Monday, 1st June 2023 and the organisers are welcoming contributed talks from researchers who have used ESO imaging survey datasets, but also broader community working on imaging surveys that put the legacy of VIRCAM and OmegaCAM surveys in perspective. Furthermore, the current list of invited speakers as well as the registration fees for in-person participants are now available on the workshop’s website.

The release of the MUSE Hubble Ultra-Deep Field survey (Programmes 094.A-0289(B), 095.A-0010(A), 096.A-0045(A), 096.A-0045(B) and 1101.A-0127, PI R. Bacon) includes the deepest spectroscopic survey ever performed. The MUSE mosaic data cubes, with their 3D content, amazing depth, wide spectral range, and excellent spatial and medium spectral resolution, are rich in information. The 3σ point-source flux limit of an unresolved emission line reaches 3.1×10^-19 and 6.3×10^-20 erg s^-1 cm^-2 at 10- and 141-hour depths, respectively. The redshifts of 2221 sources have securely been identified and measured. With the exception of eight stars, the collected sample consists of 25 nearby galaxies (z < 0.25), 677 [O ii] emitters (z = 0.25 - 1.5), 201 galaxies in the MUSE redshift desert range (z = 1.5 - 2.8) and 1308 Lyα emitters (z = 2.8 - 6.7). This represents an order of magnitude more than the collection of all spectroscopic redshifts obtained before MUSE in the Hubble ultra-deep field area (i.e., 2221 versus 292). At high redshift (z > 3), the difference is even more striking, with a factor of 65 increase (1308 versus 20).

The NIRPS instrument, a cryogenic adaptive-optics equipped high-resolution (R=80,000) spectrograph newly installed on La Silla 3.6-m telescope has successfully entered operation at the start of the new period, on April 1st. The instrument is equipped with a stabilized Fabry-Perot calibration source ensuring high radial velocity precision, with a goal of reaching 1m/s. NIRPS targets M-dwarfs since their so-called habitable zones are closer than for stars like our Sun, and so the orbital periods of planets are shorter than the orbital period of Earth, on the order of weeks instead of a year.

In 2022, the ESO community once again published more than 1,000 papers, for the 6^th consecutive year. The total number of data papers included in the ESO Telescope Bibliography (telbib) published between 1996 and 2022 has risen to over 19,500. Despite the fact that ESO's facilities were not operating at the beginning of the pandemic, and then were operating with reduced capacity for several months, the number of refereed data papers remained remarkably stable.

The Beta Pic dataset was obtained on 3 February 2023, in the course of the ESO-led development of a new GRA4MAT narrow off-axis mode. This new mode allows an observer to specify small offsets where to point MATISSE, with respect to the fringe tracking target. This mode is very similar to the dual on-axis mode of GRAVITY that was successfully applied to exoplanet spectroscopy. It will be offered to the community in the Call for Proposals for Period 112.

The Users Committee (UC) represents ESO's astronomical community at large and acts as an advisory body to the ESO Director General on matters related to the performance, scientific access, operation and user interfaces to the La Silla Paranal Observatory and ALMA. The annual meeting of the UC is scheduled on 20 and 21 April 2023. During the UC meeting updates from ESO and feedback from the user community are exchanged and openly discussed. Each year one topic is explored in more detail and this year the Special Topic session is dedicated to Archive Science.

The Multiconjugate adaptive Optics Relay For ELT Observations (MORFEO, previously known as MAORY), an upcoming instrument for ESO’s Extremely Large Telescope (ELT), has recently passed its preliminary design review. MORFEO’s adaptive optics system will use special sensors to measure the blurring effects of the Earth’s atmosphere, correcting them with deformable mirrors. This will allow astronomers to get an unprecedented view into the Universe, offering detailed observations of distant galaxies and stars at the centre of the Milky Way.  

ALMA observations in Band 1 will be offered from Cycle 10. The science verification targets chosen for Band 1 are Orion KL and W51. The observations of these targets demonstrate the imaging and spectral scan capabilities in Band 1. The data are planned to be taken with about 20 antennas and will be released for public use. More information about the Band 1 science verification observations can be found here.

The European ALMA Regional Centre invites European ALMA users to a virtual community assembly on April 17 at 11:00 CEST, in connection with the Cycle 10 call for proposals. At this meeting, more information will be provided on the procedures for Joint Proposals with other facilities, including the European Southern Observatory's Very Large Telescope, the Space Telescope Science Institute's James Webb Space Telescope, and the National Radio Astronomy Observatory's Karl G. Jansky Very Large Array.