Galaxy-Galaxy Blending in SPHEREx Survey Data
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arXiv
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| Auteurs principaux: | , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866908797602103296 |
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| author | Dachan, Kim Song, Hyunmi Kim, Yigon Kim, Minjin Shim, Hyunjin Kim, Dohyeong Kim, Yongjung Lee, Bomee Lee, Jeong Hwan Jeong, Woong-Seob Yang, Yujin |
| author_facet | Dachan, Kim Song, Hyunmi Kim, Yigon Kim, Minjin Shim, Hyunjin Kim, Dohyeong Kim, Yongjung Lee, Bomee Lee, Jeong Hwan Jeong, Woong-Seob Yang, Yujin |
| contents | The Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer (SPHEREx) will provide all-sky spectral survey data covering optical to mid-infrared wavelengths with a spatial resolution of 6\farcs2, which can be widely used to study galaxy formation and evolution. We investigate the galaxy-galaxy blending in SPHEREx datasets using the mock galaxy catalogs generated from cosmological simulations and observational data. Only $\sim0.7\%$ of the galaxies will be blended with other galaxies in all-sky survey data with a limiting magnitude of 19 AB mag. However, the fraction of blended galaxies dramatically increases to $\sim7$--$9\%$ in the deep survey area around the ecliptic poles, where the depth reaches $\sim22$ AB mag. We examine the impact of the blending in the number count and luminosity function analyses using the SPHEREx data. We find that the number count can be overestimated by up to $10$--$20\%$ in the deep regions due to the flux boosting, suggesting that the impact of galaxy-galaxy blending on the number count is moderate. However, galaxy-galaxy blending can marginally change the luminosity function by up to 50\%\ over a wide range of redshifts. As we only employ the magnitude limit at $K_s$-band for the source detection, the blending fractions determined in this study should be regarded as lower limits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_21627 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Galaxy-Galaxy Blending in SPHEREx Survey Data Dachan, Kim Song, Hyunmi Kim, Yigon Kim, Minjin Shim, Hyunjin Kim, Dohyeong Kim, Yongjung Lee, Bomee Lee, Jeong Hwan Jeong, Woong-Seob Yang, Yujin Astrophysics of Galaxies The Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer (SPHEREx) will provide all-sky spectral survey data covering optical to mid-infrared wavelengths with a spatial resolution of 6\farcs2, which can be widely used to study galaxy formation and evolution. We investigate the galaxy-galaxy blending in SPHEREx datasets using the mock galaxy catalogs generated from cosmological simulations and observational data. Only $\sim0.7\%$ of the galaxies will be blended with other galaxies in all-sky survey data with a limiting magnitude of 19 AB mag. However, the fraction of blended galaxies dramatically increases to $\sim7$--$9\%$ in the deep survey area around the ecliptic poles, where the depth reaches $\sim22$ AB mag. We examine the impact of the blending in the number count and luminosity function analyses using the SPHEREx data. We find that the number count can be overestimated by up to $10$--$20\%$ in the deep regions due to the flux boosting, suggesting that the impact of galaxy-galaxy blending on the number count is moderate. However, galaxy-galaxy blending can marginally change the luminosity function by up to 50\%\ over a wide range of redshifts. As we only employ the magnitude limit at $K_s$-band for the source detection, the blending fractions determined in this study should be regarded as lower limits. |
| title | Galaxy-Galaxy Blending in SPHEREx Survey Data |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2601.21627 |