Welcome to SKA-Japan

Workshop 2010

Many thanks to NAOJ and the Foundation of Promotion of Astronomy for financial support

SKA (Square Kilometer Array) Big Project in the Next Decades

•Freq. range ： 0.07 － 10GHz (25GHz)•Antenna ： Aperture Array, Dishes (2000-

3000 ) •Site: Australia or South Africa•Characteristics

High sensitivity, Wide-band, Wide field, High resolution

　 Japan SKA consortium• Establishment ： May 2008• Member ： 86　individuals　from　26inst.

• Organizers ：H. Nakanishi （ Kagoshima uni. ; chair)Y. Hagiwara (NAOJ)O. Kameya (NAOJ)

• Aim ：To promote Japanese researchers to be involved into the international SKA project

• Activities ：Sharing informations via MLMonthly teleconScience Working group (SWG),

Engineering Working Group (EWG)Discussion on collaboration with IndustryHosting WorkshopApplying for research budget

ＳＷＧ Magnetic field AGN High-z galaxy Pulsar Astrometry Astro-chemistry

ＳＷＧ Magnetic field AGN High-z galaxy Pulsar Astrometry Astro-chemistry

EWG Wideband feed Wideband receiver Wideband backend

EWG Wideband feed Wideband receiver Wideband backend Handmade tapered slot antenna

（ upper ） mesurement in the rqdio quiet room （ lower ）(Kozuma 2010)

↑spectra obtained with fast A/D converter

← Spectra obtained with heterodyne receiver （ Kawaguchi NAOJ, 2008)

8-50GHz linesurvey towards TMC-1(Kaifu et al. 2004)

10xBandwidth＋ spectral fitting⇒ 3x Increase in Dyncamic range

⇒ Higher sensitivity　・ Distant faint object can be detected　・ Increase of reference source for astrometry

Cotton (SKA2009 ＠Capetown)

Polarization angle over wideband→More accurate rotation

NTT Photonics Laboratory

InP HBT fast 3bit A/D sampler

Key WordUltraWideband

3C287

3

AGN CTD93 SED (Nagai et al. 2006)

Industry forum CollaborationIndustry forum Collaboration

SKA Workshop 2008Date: 1-2 Nov. 2008Place: NAOJ Mitaka campusTopic: Combination of science and engineeringTalks: Science: Cosmology, re-ionization, nearby and distant

galaxies, cluster of galaxy, AGN, Magnetic field, Astrometry, SFR, interstellar chemistry, pulsar, transient, solar system

Engineering: Homodyne receiver Status of facilities related to low frequency(Previous workshops were held in 2004 and 2006.

Only science was focused on. )

Topics:Revealing the Universe withWide-band cm-Wavelength Observation

Aim:•To understand the current status of international SKA project•To form more international networks•Key science and engineering for Japanese community•What contribution we can do •Next step