Junor+1999 1um / 2.4m http://asd.gsfc.nasa.gov/archive/hubble/ 3mm - - PowerPoint PPT Presentation

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HST (OPTICAL) Harms + 1994 M87 Walker+2007 VLBA( Radio Interferometry, VLBI) Junor+1999 1um / 2.4m http://asd.gsfc.nasa.gov/archive/hubble/ 3mm / 300m 3mm / 45m Japanese VLBI, D=2000km Radio IR Visible UV X- ray

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M87 HST (OPTICAL) Harms + 1994 VLBA( Radio Interferometry, VLBI) Junor+1999 Walker+2007

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1um / 2.4m 3mm / 300m 3mm / 45m

http://asd.gsfc.nasa.gov/archive/hubble/

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Japanese VLBI, D=2000km

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High Resolution

Lobanov, A.P. 2003, SKA Memo 38 Realized Telescopes Radio IR Visible UV X-ray γ-ray

VLBI

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BT T T kS 2

2 1 2 1

 

Source Flux Antenna Diameter of Station 1,2

bandwidth

Integration Time Receiver noise

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Whitney 2011

OCTAVE (Network base)

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Y.U.

SINET4 JGN-X Local Access line

NAOJ Correlation Center H.U NIFS KEK Tomakomai11m Kashima34m Yamaguchi 32m Gifu11m GSI 32m

OCTAVE : Optically Connected Array for VLBI Exploration

Otemachi

Wideband 10GbE Network

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In scientific operation as an element of JVN (Japanese VLBI network)

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VLBI Observation of Fermi/LAT Un-associated Gamma-ray Sources

Identify the un-identified γ-ray sources

using “high sensitivity” VLBI

– search for new γ-ray emitting VLBI sources

Fermi/LAT 3-years all sky map, Fermi Webpage

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VLBI observation for Fermi-FoVs

Obs. Status:

– Date: 2012 Dec 1, 2, 3, 8, 24, total of 70-hrs – 1-baseline: Yamaguchi – Tsukuba (~800 km) – Freq. (ΔB): 8.4 (0.512) GHz – Maximum angular resolution: 9 mili-arcsec – T_int: 3 min (for every sources) – Sν_min: ~ 2 mJy (TB_min > 3 x 10^5) : observations

(~ 0.8 mJy (TB_min ~ 1.4 x 105) : calculation)

Target:

– We conducted observations for 150 un-IDs ( = 845 sources which are 70% of all our targets)

*all δ >= 0 deg sources, and several δ < 0 deg sources

AP-RASC'13, Taipei Taiwan, 2013 Sep 7

Niinuma+2013

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Detection of new VLBI sources

Total of 27 new VLBI sources

– 17 detections – 10 marginal detections

All VLBI sources were found one

by one for each un-IDs

– These VLBI sources are

possible counterpart to each

unIDs?

γ-ray emitting blazars?

– Further multi-ν VLBI obs. will be planed to know morphology and radio spectra

AP-RASC'13, Taipei Taiwan, 2013 Sep 7

new VLBI source within Fermi-FoV

Niinuma+2013 won YSA2013

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