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The Milky Way tomography with Subaru Hyper Suprime-Cam. I. Halo substructures.
- Source :
-
Publications of the Astronomical Society of Japan . Apr2024, Vol. 76 Issue 2, p205-218. 14p. - Publication Year :
- 2024
-
Abstract
- We analyze the photometric data in the Wide layer of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) over ∼1200 deg2 to uncover new halo substructures beyond the distance, D ⊙ ∼ 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 a new overdensity toward Boötes at about D ⊙ ∼ 60 kpc and a new stream-like feature toward Pisces at around D ⊙ ∼ 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *MILKY Way
*STELLAR parallax
*MAIN sequence (Astronomy)
*TOMOGRAPHY
*SPECTROGRAPHS
Subjects
Details
- Language :
- English
- ISSN :
- 00046264
- Volume :
- 76
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Publications of the Astronomical Society of Japan
- Publication Type :
- Academic Journal
- Accession number :
- 176847279
- Full Text :
- https://doi.org/10.1093/pasj/psae003