A Deep Search for a Strong Diffuse Interstellar Band in the Circumgalactic Medium
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arXiv
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| Formato: | Preprint |
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2025
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| author | Chang, Chih-Yuan Lan, Ting-Wen |
| author_facet | Chang, Chih-Yuan Lan, Ting-Wen |
| contents | We investigate the absorption signals of a strong diffuse interstellar band, DIB$\lambda4430$, in the circumgalactic medium (CGM) traced by MgII absorption lines. To this end, we make use of approximately 60,000 MgII absorption line spectra within $0.4<z<1.0$ compiled from the Sloan Digital Sky Surveys and obtain composite spectra with uncertainties for absorption line measurements being a few m$Å$. By using MgII absorption strength and dust reddening relation from the literature, we measure the DIB$\lambda4430$ absorption strength as a function of $\rm E(B-V)$ in the CGM, and compare the Milky Way DIB$\lambda4430$ - $\rm E(B-V)$ relation extrapolated down to the CGM $\rm E(B-V)$ region. Our results show no detectable signals of DIB$\lambda4430$ across the entire $\rm E(B-V)$ range in the CGM traced by MgII absorption lines. This lack of detection of DIB$\lambda4430$ in the CGM is inconsistent with the Milky Way signals by $\sim 5 \, σ$, indicating that the factors associated with different environments affect the abundance of the DIB$\lambda4430$ carrier. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_07082 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Deep Search for a Strong Diffuse Interstellar Band in the Circumgalactic Medium Chang, Chih-Yuan Lan, Ting-Wen Astrophysics of Galaxies We investigate the absorption signals of a strong diffuse interstellar band, DIB$\lambda4430$, in the circumgalactic medium (CGM) traced by MgII absorption lines. To this end, we make use of approximately 60,000 MgII absorption line spectra within $0.4<z<1.0$ compiled from the Sloan Digital Sky Surveys and obtain composite spectra with uncertainties for absorption line measurements being a few m$Å$. By using MgII absorption strength and dust reddening relation from the literature, we measure the DIB$\lambda4430$ absorption strength as a function of $\rm E(B-V)$ in the CGM, and compare the Milky Way DIB$\lambda4430$ - $\rm E(B-V)$ relation extrapolated down to the CGM $\rm E(B-V)$ region. Our results show no detectable signals of DIB$\lambda4430$ across the entire $\rm E(B-V)$ range in the CGM traced by MgII absorption lines. This lack of detection of DIB$\lambda4430$ in the CGM is inconsistent with the Milky Way signals by $\sim 5 \, σ$, indicating that the factors associated with different environments affect the abundance of the DIB$\lambda4430$ carrier. |
| title | A Deep Search for a Strong Diffuse Interstellar Band in the Circumgalactic Medium |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2501.07082 |