Evidence of Galactic Center Expansion from Gaia DR3 Stars along the South North Axis: Implications for the JWST Early Galaxy Problem
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arXiv
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| Natura: | Preprint |
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2025
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| author | Karapetian, G. S. Byzalov, L. E. Hovhannisyan, M. A. Mahtessian, L. A. Mahtessian, A. P. |
| author_facet | Karapetian, G. S. Byzalov, L. E. Hovhannisyan, M. A. Mahtessian, L. A. Mahtessian, A. P. |
| contents | Recent observations with the James Webb Space Telescope (JWST) have revealed massive, evolved galaxies only a few hundred million years after the Big Bang, challenging standard cosmological models. To test the hypothesis that the Galactic nucleus may act as a source of matter and energy capable of accelerating galaxy formation, we examined whether the Milky Way itself shows signs of central activity. Expansion of the Galactic center would imply such activity in its nuclear region. To investigate this possibility, we analyzed stellar motions along the south north axis of the Galaxy using Gaia DR3 data. Average Galactocentric radial velocities were computed in 50 control points, spaced by 0.1 kpc with a sampling radius of 0.05 kpc, up to 5 kpc from the Galactic center. The results show a strong symmetry: in the northern region, 36 of 50 points have positive velocities, with an average of 19.15 +/- 10.80 km/s (N = 50), while in the southern region, 37 of 50 points have negative velocities, with an average of - 19.24 +/- 8.22 km/s (N = 50). A Students t test confirms that the two distributions differ significantly (0.003).
The combination of positive average velocities in the north and negative average velocities in the south indicates a symmetric outflow of stars away from the Galactic center, consistent with expansion in its central region.
These Galactocentric radial velocities are consistent with the formation of massive, evolved galaxies within 300 My, as observed by JWST. If extended to other galaxies, the results (together with earlier findings on globular cluster motions) suggest that aspects of standard galaxy formation models may require refinement. This interpretation, however, remains preliminary and requires further study. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_10856 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Evidence of Galactic Center Expansion from Gaia DR3 Stars along the South North Axis: Implications for the JWST Early Galaxy Problem Karapetian, G. S. Byzalov, L. E. Hovhannisyan, M. A. Mahtessian, L. A. Mahtessian, A. P. Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics Recent observations with the James Webb Space Telescope (JWST) have revealed massive, evolved galaxies only a few hundred million years after the Big Bang, challenging standard cosmological models. To test the hypothesis that the Galactic nucleus may act as a source of matter and energy capable of accelerating galaxy formation, we examined whether the Milky Way itself shows signs of central activity. Expansion of the Galactic center would imply such activity in its nuclear region. To investigate this possibility, we analyzed stellar motions along the south north axis of the Galaxy using Gaia DR3 data. Average Galactocentric radial velocities were computed in 50 control points, spaced by 0.1 kpc with a sampling radius of 0.05 kpc, up to 5 kpc from the Galactic center. The results show a strong symmetry: in the northern region, 36 of 50 points have positive velocities, with an average of 19.15 +/- 10.80 km/s (N = 50), while in the southern region, 37 of 50 points have negative velocities, with an average of - 19.24 +/- 8.22 km/s (N = 50). A Students t test confirms that the two distributions differ significantly (0.003). The combination of positive average velocities in the north and negative average velocities in the south indicates a symmetric outflow of stars away from the Galactic center, consistent with expansion in its central region. These Galactocentric radial velocities are consistent with the formation of massive, evolved galaxies within 300 My, as observed by JWST. If extended to other galaxies, the results (together with earlier findings on globular cluster motions) suggest that aspects of standard galaxy formation models may require refinement. This interpretation, however, remains preliminary and requires further study. |
| title | Evidence of Galactic Center Expansion from Gaia DR3 Stars along the South North Axis: Implications for the JWST Early Galaxy Problem |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2509.10856 |