Prospects for constraining quasar ages with fiber spectrographs: quasar-induced Ly$α$ emission from the intergalactic medium
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| author | Hada, Ryuichiro Takada, Masahiro Inoue, Akio K. |
| author_facet | Hada, Ryuichiro Takada, Masahiro Inoue, Akio K. |
| contents | We present a theoretical framework for linking quasar properties, such as quasar age, to the surrounding Ly$α$ emission intensity. In particular, we focus on a method for mapping the large-scale structure of Ly$α$ emission intensity with galaxy spectra from wide-field spectroscopic surveys, e.g., the Subaru Prime Focus Spectrograph (PFS) or the Dark Energy Spectroscopic Instrument (DESI), and consider the quasar-induced Ly$α$ emission from the intergalactic medium (IGM). To do this, we construct a theoretical model based on two physical processes: resonant scattering of quasar Ly$α$ photons and fluorescence due to quasar ionizing photons, finding that the fluorescence contribution due to optically thick gas clouds is dominant. Taking into account the light cone effect and assuming a typical quasar spectrum, we calculate the fluorescence contribution to the spectrum stacked within each bin of the separation angle from the quasar as a function of quasar age. Furthermore, we compute the quasar-Ly$α$ emission cross-correlation and its SNR for the planned PFS survey. The predicted signal can only account for $\sim10\%$ of the measurements indicated from the BOSS and eBOSS surveys in the outer region of $> 10\ \rm{cMpc}\ \rm{h}^{-1}$, and the predicted SNR is not sufficient to detect the quasar-induced contribution. However, we found that our model, combined with the contribution of star-forming galaxies, is not in conflict with these measurements. We discuss other possible contributions to the Ly$α$ emission excess around quasars, the efficiency of using spectroscopic fibers, and the redshift dependence of our model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_02374 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Prospects for constraining quasar ages with fiber spectrographs: quasar-induced Ly$α$ emission from the intergalactic medium Hada, Ryuichiro Takada, Masahiro Inoue, Akio K. Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We present a theoretical framework for linking quasar properties, such as quasar age, to the surrounding Ly$α$ emission intensity. In particular, we focus on a method for mapping the large-scale structure of Ly$α$ emission intensity with galaxy spectra from wide-field spectroscopic surveys, e.g., the Subaru Prime Focus Spectrograph (PFS) or the Dark Energy Spectroscopic Instrument (DESI), and consider the quasar-induced Ly$α$ emission from the intergalactic medium (IGM). To do this, we construct a theoretical model based on two physical processes: resonant scattering of quasar Ly$α$ photons and fluorescence due to quasar ionizing photons, finding that the fluorescence contribution due to optically thick gas clouds is dominant. Taking into account the light cone effect and assuming a typical quasar spectrum, we calculate the fluorescence contribution to the spectrum stacked within each bin of the separation angle from the quasar as a function of quasar age. Furthermore, we compute the quasar-Ly$α$ emission cross-correlation and its SNR for the planned PFS survey. The predicted signal can only account for $\sim10\%$ of the measurements indicated from the BOSS and eBOSS surveys in the outer region of $> 10\ \rm{cMpc}\ \rm{h}^{-1}$, and the predicted SNR is not sufficient to detect the quasar-induced contribution. However, we found that our model, combined with the contribution of star-forming galaxies, is not in conflict with these measurements. We discuss other possible contributions to the Ly$α$ emission excess around quasars, the efficiency of using spectroscopic fibers, and the redshift dependence of our model. |
| title | Prospects for constraining quasar ages with fiber spectrographs: quasar-induced Ly$α$ emission from the intergalactic medium |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2312.02374 |