SDSS-V Local Volume Mapper (LVM): The Integrated Light and Internal Rotation of Omega Centauri

@misc{haberle2026sdssv,
  title = {{SDSS-V Local Volume Mapper (LVM): The Integrated Light and Internal Rotation of Omega Centauri}},
  author = {Maximilian Häberle and Dmitry Bizyaev and Alina Boecker and Callie Clontz and Bruno Dias and Antoine Dumont and Evgeniya Egorova and Anja Feldmeier-Krause and José G. Fernández-Trincado and Pablo García and Thomas M. Herbst and Thomas Hilder and Hector Javier Ibarra-Medel and Amy M. Jones and Ralf Klessen and Nick Konidaris and Kathryn Kreckel and Alejandra Z. Lugo-Aranda and Alfredo Mejía-Narváez and Nadine Neumayer and Hans-Walter Rix and Alexandre Roman-Lopes and Sebastián Sánchez and Saroon Sasi and Anil Seth and Amrita Singh and Peter Smith and Rodolfo de J. Zermeño and Zixian Wang and Guillermo A. Blanc and Joel R. Brownstein and Niv Drory and Oleg Egorov and Evelyn J. Johnston and Ivan Katkov and Juna A. Kollmeier and Sorya Lambert},
  howpublished = {arXiv},
  year = {2026},
  month = jul,
  doi = {10.48550/arxiv.2607.28809},
  eprint = {2607.28809},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.28809},
}

TY  - UNPB
TI  - SDSS-V Local Volume Mapper (LVM): The Integrated Light and Internal Rotation of Omega Centauri
AU  - Maximilian Häberle
AU  - Dmitry Bizyaev
AU  - Alina Boecker
AU  - Callie Clontz
AU  - Bruno Dias
AU  - Antoine Dumont
AU  - Evgeniya Egorova
AU  - Anja Feldmeier-Krause
AU  - José G. Fernández-Trincado
AU  - Pablo García
AU  - Thomas M. Herbst
AU  - Thomas Hilder
AU  - Hector Javier Ibarra-Medel
AU  - Amy M. Jones
AU  - Ralf Klessen
AU  - Nick Konidaris
AU  - Kathryn Kreckel
AU  - Alejandra Z. Lugo-Aranda
AU  - Alfredo Mejía-Narváez
AU  - Nadine Neumayer
AU  - Hans-Walter Rix
AU  - Alexandre Roman-Lopes
AU  - Sebastián Sánchez
AU  - Saroon Sasi
AU  - Anil Seth
AU  - Amrita Singh
AU  - Peter Smith
AU  - Rodolfo de J. Zermeño
AU  - Zixian Wang
AU  - Guillermo A. Blanc
AU  - Joel R. Brownstein
AU  - Niv Drory
AU  - Oleg Egorov
AU  - Evelyn J. Johnston
AU  - Ivan Katkov
AU  - Juna A. Kollmeier
AU  - Sorya Lambert
PY  - 2026
DA  - 2026/07/30
PB  - arXiv
DO  - 10.48550/arxiv.2607.28809
UR  - https://arxiv.org/abs/2607.28809
AB  - The SDSS-V Local Volume Mapper (LVM) is a wide-field integral field spectroscopic survey of the Southern Milky Way plane, the Magellanic Clouds, and nearby Local Group galaxies. We use Early Science observations of the whole body of the nearest nuclear cluster, Omega Centauri, to extend the LVM beyond its primary interstellar-medium science case. The wide LVM field allows us to precisely map ω Cen's line-of-sight rotation out to ∼ 3r_HL or 15^′, reaching a maximum value of (8.4 ± 0.8) km s^−1 at r ≈ 4.7^′. Within the central region, comparisons with existing VLT MUSE oMEGACat data show explicitly that the unresolved-light signal is dominated by a small number of bright stars, with an effective sample size of only ∼12 per resolution element. Using Gaia DR3 as an external reference, we verify that the SDSS-V's LVM reduction pipeline recovers integrated stellar fluxes to 1-4 % across six magnitudes of surface brightness. Our resulting total spectrum of ω Cen is one of the highest S/N integrated spectrum for any globular or nuclear star cluster. We use it to test four widely-used SSP template libraries against resolved age-metallicity ground truth from oMEGACat. All templates recover an old, metal-poor population. But, even at S/N ∼1300, the inferred mean ages and mean [Fe/H] vary by ∼7 Gyr and ∼0.4 dex, respectively, across libraries and wavelength ranges, reflecting a systematic floor for integrated-light studies of old multi-population systems.
ER  -