The Milky Way Tomography with Subaru Hyper Suprime-Cam. I. Halo substructures
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866911372877496320 |
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| author | Suzuki, Yoshihisa Chiba, Masashi Komiyama, Yutaka Hayashi, Kohei Tanaka, Masayuki Fukushima, Tetsuya Carlsten, Scott G. Tokiwa, Akira Qiu, Tian Takada, Masahiro |
| author_facet | Suzuki, Yoshihisa Chiba, Masashi Komiyama, Yutaka Hayashi, Kohei Tanaka, Masayuki Fukushima, Tetsuya Carlsten, Scott G. Tokiwa, Akira Qiu, Tian Takada, Masahiro |
| contents | We analyze the photometric data in the Wide layer of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) over $\sim 1,200$ deg$^{2}$ to uncover new halo substructures beyond the distance, $D_{\odot}\sim$ 30 kpc, from the Sun. For this purpose, we develop an isochrone filter for an old, metal-poor stellar system to extract the faint main-sequence stars at a range of distances. With this method, we detect, not only the previously discovered substructures such as the Orphan Stream, but also the new overdensity toward Boötes at about $D_{\odot}\sim$ 60 kpc and the new stream-like feature toward Pisces at around $D_{\odot}\sim$ 60 kpc. It has been suggested that a small-scale overdensity exists in this direction of Pisces (the so-called Pisces Overdensity), but our results show that the overdensity is widely spread with a tidally elongated feature. Combining our results with the ongoing Hyper Suprime-Cam narrow-band survey and the near-future spectroscopic survey with Prime Focus Spectrograph (PFS) will allow us to place strong constraints on the origin of these halo substructures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_17378 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The Milky Way Tomography with Subaru Hyper Suprime-Cam. I. Halo substructures Suzuki, Yoshihisa Chiba, Masashi Komiyama, Yutaka Hayashi, Kohei Tanaka, Masayuki Fukushima, Tetsuya Carlsten, Scott G. Tokiwa, Akira Qiu, Tian Takada, Masahiro Astrophysics of Galaxies We analyze the photometric data in the Wide layer of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) over $\sim 1,200$ deg$^{2}$ to uncover new halo substructures beyond the distance, $D_{\odot}\sim$ 30 kpc, from the Sun. For this purpose, we develop an isochrone filter for an old, metal-poor stellar system to extract the faint main-sequence stars at a range of distances. With this method, we detect, not only the previously discovered substructures such as the Orphan Stream, but also the new overdensity toward Boötes at about $D_{\odot}\sim$ 60 kpc and the new stream-like feature toward Pisces at around $D_{\odot}\sim$ 60 kpc. It has been suggested that a small-scale overdensity exists in this direction of Pisces (the so-called Pisces Overdensity), but our results show that the overdensity is widely spread with a tidally elongated feature. Combining our results with the ongoing Hyper Suprime-Cam narrow-band survey and the near-future spectroscopic survey with Prime Focus Spectrograph (PFS) will allow us to place strong constraints on the origin of these halo substructures. |
| title | The Milky Way Tomography with Subaru Hyper Suprime-Cam. I. Halo substructures |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2311.17378 |