The Hubble Missing Globular Cluster Survey III. Astro-photometric catalogs, artificial-star tests, and improved absolute proper motions

Libralato, M, Bellini, A, Massari, D, Bellazzini, M, Aguado-Agelet, F, Cassisi, S, Ceccarelli, E, Dalessandro, E, Dodd, E, Ferraro, FR, Gallart, C, Lanzoni, B, Monelli, M, Mucciarelli, A, Pancino, E, Pascale, R, Rosignoli, L, Salaris, M ORCID: 0000-0002-2744-1928, Saracino, S and Zerbinati, C (2026) The Hubble Missing Globular Cluster Survey III. Astro-photometric catalogs, artificial-star tests, and improved absolute proper motions. Astronomy & Astrophysics, 709. ISSN 0004-6361

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Abstract

The Hubble Missing Globular Cluster Survey (MGCS) has taken one of the last opportunities to complete the census of Galactic globular clusters (GCs) started by past Hubble Space Telescope (HST) programs, securing high-resolution data for 34 GCs never observed before by HST. The previous papers in the series have highlighted the astrometric and photometric potential of the project by analyzing a subsample of targets. We present, and release to the community, the official astro-photometric catalogs of the MGCS for all GCs imaged by this project. We describe the data reduction using state-of-the-art techniques designed for HST. We discuss the photometric calibration and show, for the first time, the synergy with the Gaia catalog to ensure homogeneous photometry across our data set. We compute artificial-star tests that can be used to assess systematics and the completeness level of our data. We combined HST and Gaia data to refine the absolute proper motions of our GCs, reaching a precision ∼3 times better than that of Gaia alone. We used these new proper motions to update (and to determine for the first time for five systems) the associations between GCs and their putative galaxy progenitors. This work continues decades-long efforts of large Treasury programs in sharing precise and accurate atlases to the community for studying GCs across a wide range of scientific endeavors.

Item Type:	Article
Uncontrolled Keywords:	techniques: photometric; catalogs; astrometry; proper motions; globular clusters: general; 5109 Space Sciences; 51 Physical Sciences; 5109 Space Sciences; 51 Physical Sciences; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics; 5101 Astronomical sciences; 5107 Particle and high energy physics; 5109 Space sciences
Subjects:	Q Science > QB Astronomy
Divisions:	Astrophysics Research Institute
Publisher:	EDP Sciences
Date of acceptance:	21 March 2026
Date of first compliant Open Access:	27 May 2026
Date Deposited:	27 May 2026 09:42
Last Modified:	27 May 2026 09:42
DOI or ID number:	10.1051/0004-6361/202659363
URI:	https://researchonline.ljmu.ac.uk/id/eprint/28667

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