Far-Infrared and [CII] observations of a z=7 blazar
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| Format: | Preprint |
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2024
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| author | Banados, Eduardo Khusanova, Yana Decarli, Roberto Momjian, Emmanuel Walter, Fabian Connor, Thomas Carilli, Christopher Mazzucchelli, Chiara Rojas-Ruiz, Sofia Venemans, Bram |
| author_facet | Banados, Eduardo Khusanova, Yana Decarli, Roberto Momjian, Emmanuel Walter, Fabian Connor, Thomas Carilli, Christopher Mazzucchelli, Chiara Rojas-Ruiz, Sofia Venemans, Bram |
| contents | We present millimeter observations of the host galaxy of the most distant blazar known, VLASSJ041009.05-013919.88 (hereafter J0410-0139) at z=7, using ALMA and NOEMA observations. The ALMA data reveal a 2e42 erg/s [CII] 158um emission line at z=6.9964 with a [CII]-inferred star-formation rate of 58 Msun/yr. We estimate a dynamical mass of 4.6e9 Msun, implying a black hole mass to host a dynamical mass ratio of 0.15. The 238 GHz continuum (rest-frame IR) decreased by ~33% from the NOEMA to the ALMA observations taken ~10 months apart. The VLA 3-10 GHz radio flux densities showed a ~37% decrease in a similar time frame, suggesting a causal connection. At face value, J0410-0139 would have the lowest [CII]-to-IR luminosity ratio of a z>5.7 quasar reported to date (~1e-4). However, if only <20% of the measured IR luminosity were due to thermal emission from dust, the [CII]-to-IR luminosity ratio would be typical of (U)LIRGS, and the star formation rates derived from [CII] and IR luminosities would be consistent. These results provide further evidence that synchrotron emission significantly contributes to the observed rest-frame IR emission of J0410-0139, similar to what has been reported in some radio-loud AGN at z<1. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_12299 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Far-Infrared and [CII] observations of a z=7 blazar Banados, Eduardo Khusanova, Yana Decarli, Roberto Momjian, Emmanuel Walter, Fabian Connor, Thomas Carilli, Christopher Mazzucchelli, Chiara Rojas-Ruiz, Sofia Venemans, Bram Astrophysics of Galaxies We present millimeter observations of the host galaxy of the most distant blazar known, VLASSJ041009.05-013919.88 (hereafter J0410-0139) at z=7, using ALMA and NOEMA observations. The ALMA data reveal a 2e42 erg/s [CII] 158um emission line at z=6.9964 with a [CII]-inferred star-formation rate of 58 Msun/yr. We estimate a dynamical mass of 4.6e9 Msun, implying a black hole mass to host a dynamical mass ratio of 0.15. The 238 GHz continuum (rest-frame IR) decreased by ~33% from the NOEMA to the ALMA observations taken ~10 months apart. The VLA 3-10 GHz radio flux densities showed a ~37% decrease in a similar time frame, suggesting a causal connection. At face value, J0410-0139 would have the lowest [CII]-to-IR luminosity ratio of a z>5.7 quasar reported to date (~1e-4). However, if only <20% of the measured IR luminosity were due to thermal emission from dust, the [CII]-to-IR luminosity ratio would be typical of (U)LIRGS, and the star formation rates derived from [CII] and IR luminosities would be consistent. These results provide further evidence that synchrotron emission significantly contributes to the observed rest-frame IR emission of J0410-0139, similar to what has been reported in some radio-loud AGN at z<1. |
| title | Far-Infrared and [CII] observations of a z=7 blazar |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2408.12299 |