The AstroSat UV Deep Field North: The IRX-$β$ relation for the UV-selected galaxies at $z\sim$ 0.5-0.7
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arXiv
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| Natura: | Preprint |
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2024
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| _version_ | 1866910452868448256 |
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| author | Mondal, Chayan Saha, Kanak |
| author_facet | Mondal, Chayan Saha, Kanak |
| contents | The relation between the observed UV continuum slope ($β$) and the infrared excess (IRX) is used as a powerful probe to understand the nature of dust attenuation law in high-redshift galaxies. We present a study of 83 UV-selected galaxies between redshift 0.5 and 0.7 from the AstroSat UV Deep Field north (AUDFn) that encloses the GOODS-north field. Using empirical relation, we estimate the observed IRX of 52 galaxies that are detected in either one or both of the Herschel PACS 100$μ$m and 160$μ$m bands. We further utilize the multi-band photometric data in 14 - 18 filters from the UVIT, KPNO, HST, Spitzer, and Herschel telescopes to perform spectral energy distribution (SED) modeling. Both the observed and model-derived IRX - $β$ values show a large scatter within the span of previously known relations, signifying diversity in dust attenuation. We found a distinct relation between the best-fit power law slope of the modified Calzetti relation ($δ$) in the IRX - $β$ plane: where the steeper SMC-like attenuation law prefers lower $δ$ values. Our SED model based IRX - $β$ relation shows a preference for steeper SMC-like attenuation which we further confirm from the agreement between extinction-corrected star formation rates derived using H$α$ emission line and the observed FUV plus reprocessed far-IR fluxes. The current study reveals a strong positive correlation between IRX and the galaxy stellar mass between $10^{9.5}$ and $10^{11.0}$ M$_{\odot}$, signifying increased dust production in more massive star-forming galaxies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_11544 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The AstroSat UV Deep Field North: The IRX-$β$ relation for the UV-selected galaxies at $z\sim$ 0.5-0.7 Mondal, Chayan Saha, Kanak Astrophysics of Galaxies The relation between the observed UV continuum slope ($β$) and the infrared excess (IRX) is used as a powerful probe to understand the nature of dust attenuation law in high-redshift galaxies. We present a study of 83 UV-selected galaxies between redshift 0.5 and 0.7 from the AstroSat UV Deep Field north (AUDFn) that encloses the GOODS-north field. Using empirical relation, we estimate the observed IRX of 52 galaxies that are detected in either one or both of the Herschel PACS 100$μ$m and 160$μ$m bands. We further utilize the multi-band photometric data in 14 - 18 filters from the UVIT, KPNO, HST, Spitzer, and Herschel telescopes to perform spectral energy distribution (SED) modeling. Both the observed and model-derived IRX - $β$ values show a large scatter within the span of previously known relations, signifying diversity in dust attenuation. We found a distinct relation between the best-fit power law slope of the modified Calzetti relation ($δ$) in the IRX - $β$ plane: where the steeper SMC-like attenuation law prefers lower $δ$ values. Our SED model based IRX - $β$ relation shows a preference for steeper SMC-like attenuation which we further confirm from the agreement between extinction-corrected star formation rates derived using H$α$ emission line and the observed FUV plus reprocessed far-IR fluxes. The current study reveals a strong positive correlation between IRX and the galaxy stellar mass between $10^{9.5}$ and $10^{11.0}$ M$_{\odot}$, signifying increased dust production in more massive star-forming galaxies. |
| title | The AstroSat UV Deep Field North: The IRX-$β$ relation for the UV-selected galaxies at $z\sim$ 0.5-0.7 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2405.11544 |