Suijian Xue ( 薛随建 ) National Astronomical Observatories, Chinese Academy of Sciences

Suijian Xue ( 薛随建 )National Astronomical Observatories, Chinese Academy of Sciences

2010-05-10 @ JEJU, Korea

Regional Report

Astronomical Activities Update in the Core Observatories, China

Mainland

CAS core observatories CAS core observatories

Changchun Observatory (CAO)

Urumqi Observatory (UAO)

Yunnan Observatory (YNAO)

Headquarters

National Astronomical Observatories (NAOC)

Nanjing Institute of Astronomical Optics and

Technology (NIAOT)

Purple Mountain Observatory (PMO)

Shanghai Observatory (SHAO)

7

Delingha

Urumqi

YNAO

Changchun

NAOC

Xinglong(LAMOST)

Miyun HuaiRou

NIAOT

Urastai

FASTGaomeigu

Distribution of the Observatories/Stations/Institutes of Distribution of the Observatories/Stations/Institutes of NAOCNAOC

PMO

SHAO

- Ground － Based Facilities

Status & Progress of FAST, 21CMA

Current and Ongoing Major Programs & Facilities

Five-hundred-meter ApertureSpherical Telescope - FAST

Unique Karst depression as the siteActive main reflectorCable - parallel robot feed support

Three outstanding aspects

FAST sciences Neutral Hydrogen line (HI) survey Pulsar research Joining VLBI network Molecular lines Search for Extraterrestrial Intelligence (SETI)

Spherical reflector ： Radius ～ 300m, Aperture ～ 500m,

Opening angle 110~120°

Illuminated aperture ： Dill=300m

Focal ratio ： f/D =0.467

Sky coverage ： zenith angle 40°(up to 60°with efficiency

loss) tracking hours 0~6h

Frequency ： 70M ~ 3 GHz （ up to 8GHz in future upgradin

g ）Sensitivity (L-Band) ： A/T~2000, T~25 K

Resolution (L-Band) ： 2.9′

Multi-beam (L-Band) ： 19, beam number of future FPA >100

Slewing ： <10min

Pointing accuracy ： 8″

General Technical Specification

1994.7 Proposal initialized – 15 yrs ago 2006.3 International review and advisory conference Chaired

by Fred Lo and Shuhua Ye 2007.7 Funding Proposal finally has been approved by

NDRC 2008.10 Feasibility Report approved by NDRC 2008.12 Preliminary design reviewed by CAS and GuiZhou

government 2008.12 Foundation laid 2015.1 First light

FAST events

FAST progress

Exploration in depressionrock-soil samples from ground

FAST progress

aluminum

Reflector elements and prototyping triangular panels, side ~11m, manufacturing error ~ 2.0 mm

Trilateral collaboration on the Multi-horn 19-beam receiver

Physical Area: 50544m2 Working Frequency: 70-200MHz

10287 antennas @ 4x6 km arms

21 Centimeter Array (21CMA)

Goal: Search for the Lights of First Stars at Epoch of Reionization

Chief Scientist: Prof. Xiangping WU [email protected]

E

W

S N

control room

21CMA Layout

81 pods along two perpendicular arms (6km+4km)

1 pod=127 antennas

Baselines: 3240 Freq channels: 4096

Total data size: 4 terabytes / day

10o

10o

Radio Sky Seen with 21CMA100 sqr deg around NCP region

Goal: catch EOR signal 10000 times below foreground

VHF Sky@21CMA Residual Background

14

Chinese Spectral Radioheliograph (CSRH) a new instrument capable of true imaging spectroscopy, with high temporal, spatial, and spectral resolution

Specifications

Freq Range 0.4–15 GHz

Spatial Res. 1.3”– 50”

Array 404.5m ＋ 602m

Max baseline 3 km

Field of view 0.6– 7 Site: Inner Mongolia

05/07/2010

By April 2010By April 2010 ，， 5-sets of antennas, 5-sets of antennas, feeds, LNAs, optic Transmitter/ feeds, LNAs, optic Transmitter/ Receivers, monitoring sub-system, Receivers, monitoring sub-system, analogous receivers, digital analogous receivers, digital correlation receivers assembled at correlation receivers assembled at Mingantu Observatory, ready for 5-Mingantu Observatory, ready for 5-element testelement test

For CSRH, radio quiet zone For CSRH, radio quiet zone protection has been establishedprotection has been established

CSRH-I (400MHz-2GHz) in 2008-2010 CSRH-I (400MHz-2GHz) in 2008-2010

CSRH-II (2-15 GHz) in 2011-2013CSRH-II (2-15 GHz) in 2011-2013