CDM and SIDM Interpretations of the Strong Gravitational Lensing Object JWST-ER1
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| Format: | Preprint |
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2024
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| _version_ | 1866916188445999104 |
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| author | Kong, Demao Yang, Daneng Yu, Hai-Bo |
| author_facet | Kong, Demao Yang, Daneng Yu, Hai-Bo |
| contents | van Dokkum et al. (arXiv:2309.07969) reported the discovery of JWST-ER1, a strong lensing object at redshift $z\approx2$, using data from the James Webb Space Telescope. The lens mass within the Einstein ring is $5.9$ times higher than the expected stellar mass from a Chabrier initial mass function, indicating a high dark matter density. In this work, we show that a cold dark matter halo, influenced by gas-driven adiabatic contraction, can account for the observed lens mass. We interpret the measurement of JWST-ER1 in the self-interacting dark matter scenario and show that the cross section per particle mass $σ/m\approx0.1~{\rm cm^2/g}$ is generally favored. Intriguingly, $σ/m\approx0.1~{\rm cm^2/g}$ can also be consistent with the strong lensing observations of early-type galaxies at redshift $z\approx0.2$, where adiabatic contraction is not observed overall. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_15840 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | CDM and SIDM Interpretations of the Strong Gravitational Lensing Object JWST-ER1 Kong, Demao Yang, Daneng Yu, Hai-Bo Astrophysics of Galaxies High Energy Physics - Phenomenology van Dokkum et al. (arXiv:2309.07969) reported the discovery of JWST-ER1, a strong lensing object at redshift $z\approx2$, using data from the James Webb Space Telescope. The lens mass within the Einstein ring is $5.9$ times higher than the expected stellar mass from a Chabrier initial mass function, indicating a high dark matter density. In this work, we show that a cold dark matter halo, influenced by gas-driven adiabatic contraction, can account for the observed lens mass. We interpret the measurement of JWST-ER1 in the self-interacting dark matter scenario and show that the cross section per particle mass $σ/m\approx0.1~{\rm cm^2/g}$ is generally favored. Intriguingly, $σ/m\approx0.1~{\rm cm^2/g}$ can also be consistent with the strong lensing observations of early-type galaxies at redshift $z\approx0.2$, where adiabatic contraction is not observed overall. |
| title | CDM and SIDM Interpretations of the Strong Gravitational Lensing Object JWST-ER1 |
| topic | Astrophysics of Galaxies High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2402.15840 |