Author Archives: PFS Project

Meeting on data analysis software in Princeton / データ解析ソフト会議がプリンストンで開かれました

Written by  Naoki Yasuda (Kavli IPMU) The galaxies PFS will observe are more than 8 billion light years away and their brightness is less than one to a 10 million of the stars visible to naked eyes. To measure the properties of these faint galaxies accurately, we have to develop data analysis software which can deal with various kinds of noises included in the acquired… Read more »

Subaru renovated a dome floor for the PFS Spectrographs / 分光器設置室完成

In July 2017, the Spectrograph Clean Room  was finally built up on the fourth floor of the dome building at Subaru Telescope! Spectrograph Clean Room at Subaru Telescope It has been one year and a few month since the previous instrument was cleaned up from the floor, in order to accommodate four PFS spectrographs. Since then, floor has been reinforced,… Read more »

PFS science working group meeting at MPA / PFSサイエンスワーキンググループ会議@MPA

The PFS Science Team is now planning a large survey observation of the Universe using PFS. Three working groups have been discussing the plans to achieve their major scientific objectives: “Cosmology” research group to reveal the nature of dark matter, dark energy and neutrinos, “Galactic archeology” research group to reconstruct the history of the Milky Way Galaxy where we exist,… Read more »

Fiber Cable: Slit Assembly of Spectrograph arrived in Marseille / ファイバーケーブル:分光器のスリット部がフランスに到着

For the PFS instrument, the lights from about 2400 astronomical objects are designed to be delivered through long fiber cable from the prime focus of the telescope to the spectrograph modules on the fourth floor in the dome building. This fiber cable subsystem, which is about 65m long in total, consists of 3 parts: (1) short cables accommodated into the… Read more »

Joint Work for Spectrograph Development at LAM / マルセイユ天文台での分光器開発強化週間

At Laboratoire d’Astrophysique de Marseille (LAM), PFS Spectrograph Module (SM) is fully integrated and its performance is validated. As a part of these processes, two visible-red camera units are being tested; one is for thermal performance test and the other is for optical performance test.  From 19th to 29th June, we got together at LAM and dedicated ourselves to joint… Read more »

Assembly of positioner module is in progress / ファイバー配置モジュール組み立て中

PFS instrument catches light from about 2400 astronomical objects using fibers paved on the focal plane at the prime focus of the Subaru telescope, and each fiber is positioned by 2-staged actuator called “Cobra” (). As talked in the previous posts, 57 assemblies of Cobra positioners and fibers are integrated to one module, which is mounted to the optical bench…. Read more »

Commissioning of IR detector at JHU / ジョンズ・ホプキンス大学で赤外検出器実験開始

PFS is a spectrometer that disperses light and measures the intensity as a function of wavelength using photosensitive detectors. The operational bandpass for the PFS instrument covers the wavelengths from 380nm to 1260nm. The light delivered to the spectrograph is initially separated into three channels of blue, red, and near-infrared (NIR) by two dichroic mirrors. Each channel is deflected to… Read more »

Prototyping Fiber Cable / ファイバーケーブル試作

In PFS observations, photons from the sky are fed into the optical fibers from one end on the Subaru prime focus, and are emitted out from the other end to feed the spectrograph. The prime focus and spectrograph are physically remote from each other, so the total length of the fibers that optically link them has to be approx. 60… Read more »

Spectrograph Integration & Test at LAM / マルセイユ天文台での活動:分光器の組み上げ試験

Among the PFS instrument subsystem, four spectrographs are developed under the leadership of LAM (Laboratoire d’Astrophysique de Marseille). Since 2015, the first spectrograph module has been integrated and tested for its performance. In this article, we’ll talk about integration and test activities at LAM. Below photo shows the Visible-Red camera unit under assembly: optical components were accommodated in the cryostat… Read more »

Review meeting of infrastructures for controling the PFS instruments / PFS装置制御設備の審査会議

Subaru Telescope and its instrument are, like those at many other observatories, controlled by operator and observer sitting in front of computers at the control room in the building next to the telescope enclosure. In some cases, they are operated even from the National Observatory of Japan in Mitaka, Tokyo. PFS is not a single-component instrument but an integration of… Read more »