Generating LSB-optimised synthetic images for simulated galaxies
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866917132788301824 |
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| author | Baes, Maarten Camps, Peter Gebek, Andrea Lauwers, Arno Schaye, Joop Vauterin, Paul |
| author_facet | Baes, Maarten Camps, Peter Gebek, Andrea Lauwers, Arno Schaye, Joop Vauterin, Paul |
| contents | We introduce an emission-biasing scheme in the SKIRT radiative transfer code that enables efficient generation of synthetic galaxy images optimized for low-surface-brightness (LSB) science. Standard Monte Carlo radiative transfer simulations achieve high signal-to-noise in bright regions but require prohibitively many photon packets to reach reliable depth in galaxy outskirts. By assigning stellar particles bias factors that scale with their smoothing lengths, our method boosts photon emission from low-density regions while conserving energy through weight corrections. Tests on a Milky-Way-like galaxy from the TNG50 cosmological simulation show that bias factors proportional to the smoothing length substantially extend the reliable LSB regime, providing an inexpensive improvement for deep synthetic imaging of simulated galaxies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_07320 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Generating LSB-optimised synthetic images for simulated galaxies Baes, Maarten Camps, Peter Gebek, Andrea Lauwers, Arno Schaye, Joop Vauterin, Paul Astrophysics of Galaxies Instrumentation and Methods for Astrophysics We introduce an emission-biasing scheme in the SKIRT radiative transfer code that enables efficient generation of synthetic galaxy images optimized for low-surface-brightness (LSB) science. Standard Monte Carlo radiative transfer simulations achieve high signal-to-noise in bright regions but require prohibitively many photon packets to reach reliable depth in galaxy outskirts. By assigning stellar particles bias factors that scale with their smoothing lengths, our method boosts photon emission from low-density regions while conserving energy through weight corrections. Tests on a Milky-Way-like galaxy from the TNG50 cosmological simulation show that bias factors proportional to the smoothing length substantially extend the reliable LSB regime, providing an inexpensive improvement for deep synthetic imaging of simulated galaxies. |
| title | Generating LSB-optimised synthetic images for simulated galaxies |
| topic | Astrophysics of Galaxies Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2512.07320 |