Large molecular and dust reservoir of a gravitationally-lensed submillimeter galaxy behind the Lupus-I molecular cloud
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| Autores principales: | , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
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2025
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| author | Tamura, Yoichi Taniguchi, Akio Bakx, Tom J. L. C. De Gregorio-Monsalvo, Itziar Hagimoto, Masato Ikarashi, Soh Kawabe, Ryohei Kohno, Kotaro Nakanishi, Kouichiro Takekoshi, Tatsuya Shimajiri, Yoshito Tsukagoshi, Takashi Hatsukade, Bunyo Iono, Daisuke Matsuhara, Hideo Saigo, Kazuya Saito, Masao |
| author_facet | Tamura, Yoichi Taniguchi, Akio Bakx, Tom J. L. C. De Gregorio-Monsalvo, Itziar Hagimoto, Masato Ikarashi, Soh Kawabe, Ryohei Kohno, Kotaro Nakanishi, Kouichiro Takekoshi, Tatsuya Shimajiri, Yoshito Tsukagoshi, Takashi Hatsukade, Bunyo Iono, Daisuke Matsuhara, Hideo Saigo, Kazuya Saito, Masao |
| contents | We report the Australian Telescope Compact Array and Nobeyama 45 m telescope detection of a remarkably bright $S_\mathrm{1.1mm}$ = 44 mJy) submillimeter galaxy MM J154506.4-344318 in emission lines at 48.5 and 97.0 GHz, respectively. We also identify part of an emission line at $\approx$ 218.3 GHz using the Atacama Large Millimeter/submillimeter Array (ALMA). Together with photometric redshift estimates and the ratio between the line and infrared luminosities, we conclude that the emission lines are most likely to be the $J$ = 2-1, 4-3, and 9-8 transitions of $^{12}$CO at redshift $z = 3.753 \pm 0.001$. ALMA 1.3 mm continuum imaging reveals an arc and a spot separated by an angular distance of 1.6 arcsec, indicative of a strongly-lensed dusty star-forming galaxy with respective molecular and dust masses of $\log{M_{\rm mol}/M_\odot} \approx 11.5$ and $\log{M_{\rm dust}/M_\odot} \approx 9.4$ after corrected for $\approx$ 6.6$\times$ gravitational magnification. The inferred dust-to-gas mass ratio is found to be high ($\approx$ 0.0083) among coeval dusty star-forming galaxies, implying the presence of a massive, chemically-enriched reservoir of cool interstellar medium at $z \approx 4$ or 1.6 Gyr after the Big Bang. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_19100 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Large molecular and dust reservoir of a gravitationally-lensed submillimeter galaxy behind the Lupus-I molecular cloud Tamura, Yoichi Taniguchi, Akio Bakx, Tom J. L. C. De Gregorio-Monsalvo, Itziar Hagimoto, Masato Ikarashi, Soh Kawabe, Ryohei Kohno, Kotaro Nakanishi, Kouichiro Takekoshi, Tatsuya Shimajiri, Yoshito Tsukagoshi, Takashi Hatsukade, Bunyo Iono, Daisuke Matsuhara, Hideo Saigo, Kazuya Saito, Masao Astrophysics of Galaxies We report the Australian Telescope Compact Array and Nobeyama 45 m telescope detection of a remarkably bright $S_\mathrm{1.1mm}$ = 44 mJy) submillimeter galaxy MM J154506.4-344318 in emission lines at 48.5 and 97.0 GHz, respectively. We also identify part of an emission line at $\approx$ 218.3 GHz using the Atacama Large Millimeter/submillimeter Array (ALMA). Together with photometric redshift estimates and the ratio between the line and infrared luminosities, we conclude that the emission lines are most likely to be the $J$ = 2-1, 4-3, and 9-8 transitions of $^{12}$CO at redshift $z = 3.753 \pm 0.001$. ALMA 1.3 mm continuum imaging reveals an arc and a spot separated by an angular distance of 1.6 arcsec, indicative of a strongly-lensed dusty star-forming galaxy with respective molecular and dust masses of $\log{M_{\rm mol}/M_\odot} \approx 11.5$ and $\log{M_{\rm dust}/M_\odot} \approx 9.4$ after corrected for $\approx$ 6.6$\times$ gravitational magnification. The inferred dust-to-gas mass ratio is found to be high ($\approx$ 0.0083) among coeval dusty star-forming galaxies, implying the presence of a massive, chemically-enriched reservoir of cool interstellar medium at $z \approx 4$ or 1.6 Gyr after the Big Bang. |
| title | Large molecular and dust reservoir of a gravitationally-lensed submillimeter galaxy behind the Lupus-I molecular cloud |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2501.19100 |