GRAVITY-RESOLVE: A comprehensive image reconstruction tool for Galactic Center observations with GRAVITY

@misc{dayem2026gravityresolve,
  title = {{GRAVITY-RESOLVE: A comprehensive image reconstruction tool for Galactic Center observations with GRAVITY}},
  author = {K. Abd El Dayem and N. Aimar and P. Amaro-Seoane and B. Aytaç and A. Berdeu and J. -P. Berger and G. Bourdarot and W. Brandner and Y. Cao and C. Correia and R. Davies and D. Defrère and A. Drescher and F. Eisenhauer and T. A. Enßlin and M. Fabricius and H. Feuchtgruber and S. Flesch and N. M. Förster Schreiber and A. Foschi and Q. Fournier and P. Garcia and R. Garcia Lopez and R. Genzel and S. Gillessen and F. Gonté and X. Haubois and S. F. Hönig and M. Houllé and S. Joharle and J. Kammerer and A. Kaufer and P. Kervella and J. Knollmüller and L. Kreidberg and L. Labadie and R. Laugier and S. Lacour and O. Lai and J. -B. Le Bouquin and J. Leftley and R. Li and B. Lopez and D. Lutz and F. Mang and A. Mérand and F. Millour and M. Montargès and N. Morujão and E. Nehiba and H. Nowacki and M. Nowak and J. Osorno and T. Ott and S. Pappert and T. Paumard and C. Paladini and K. Perraut and G. Perrin and R. Petrov},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.38589},
  eprint = {2610.38589},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.38589},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - GRAVITY-RESOLVE: A comprehensive image reconstruction tool for Galactic Center observations with GRAVITY
AU  - K. Abd El Dayem
AU  - N. Aimar
AU  - P. Amaro-Seoane
AU  - B. Aytaç
AU  - A. Berdeu
AU  - J. -P. Berger
AU  - G. Bourdarot
AU  - W. Brandner
AU  - Y. Cao
AU  - C. Correia
AU  - R. Davies
AU  - D. Defrère
AU  - A. Drescher
AU  - F. Eisenhauer
AU  - T. A. Enßlin
AU  - M. Fabricius
AU  - H. Feuchtgruber
AU  - S. Flesch
AU  - N. M. Förster Schreiber
AU  - A. Foschi
AU  - Q. Fournier
AU  - P. Garcia
AU  - R. Garcia Lopez
AU  - R. Genzel
AU  - S. Gillessen
AU  - F. Gonté
AU  - X. Haubois
AU  - S. F. Hönig
AU  - M. Houllé
AU  - S. Joharle
AU  - J. Kammerer
AU  - A. Kaufer
AU  - P. Kervella
AU  - J. Knollmüller
AU  - L. Kreidberg
AU  - L. Labadie
AU  - R. Laugier
AU  - S. Lacour
AU  - O. Lai
AU  - J. -B. Le Bouquin
AU  - J. Leftley
AU  - R. Li
AU  - B. Lopez
AU  - D. Lutz
AU  - F. Mang
AU  - A. Mérand
AU  - F. Millour
AU  - M. Montargès
AU  - N. Morujão
AU  - E. Nehiba
AU  - H. Nowacki
AU  - M. Nowak
AU  - J. Osorno
AU  - T. Ott
AU  - S. Pappert
AU  - T. Paumard
AU  - C. Paladini
AU  - K. Perraut
AU  - G. Perrin
AU  - R. Petrov
PY  - 2026
DA  - 2026/10/28
PB  - arXiv
DO  - 10.48550/arxiv.2610.38589
UR  - https://arxiv.org/abs/2610.38589
AB  - We aim to improve and extend the imaging capabilities of the GRAVITY beam combiner instrument of ESOs VLTI with respect to reconstruction software in the Galactic Center. We revise and develop the image reconstruction code GRAVITY-RESOLVE G^R, which has been specifically developed to reconstruct stars in the Galactic Center with GRAVITY. The main objectives are to increase the limiting magnitude in GRAVITY images, reduce its computational runtime, and allow for a joint reconstruction of multiple, spatially separate datasets/pointings on sky. We apply G^R to recent GRAVITY data, featuring the implemented GRAVITY-faint mode as part of GRAVITY+, the upgrade of GRAVITY. We reconstruct visibility phases and amplitudes and present the first GRAVITY image reconstructed with G^R from these quantities. We demonstrate NIR mosaicking with G^R by jointly reconstructing nine separately acquired datasets of 2025 into a single image on a scale of ≃ 3390 AU× 3390 AU, corresponding to 409.6 mas× 409.6 mas. With dedicated injection tests of point sources into GRAVITY data, we estimate the limiting magnitude to be m_K ≃ 20.0 within a radius of 25 mas around the field center when reconstructing from closure phases and visibility amplitudes. We report on the discovery of two new faint stars in the Galactic Center: S303 and S304. Finally, we find a decrease in computational runtime by a factor of at least ∼10. With G^R, we demonstrate GRAVITYs capabilities for NIR imaging. We show that G^R is a fast, precise, and deep image reconstruction tool for Galactic Center observations, enabling the discovery of even more faint stars.
ER  -