Overview and Initial Results of the Very Long Baseline Interferometry Space Observatory Programme

Hirabayashi, H.; Hirosawa, H.; Kobayashi, Hideyuki; Murata, Yasuhiro; Edwards, Philip; Fomalont, Ed; Fujisawa, Kenta; Ichikawa, Tsutomu; Kii, T.; Lovell, J. E. J.; Moellenbrock, G.; Okayasu, R.; Inoue, Makoto; Kawaguchi, Noriyuki; Kameno, Seiji; Shibata, Katsunori M.; Asaki, Y.; Bushimata, Takeshi; Enome, S.; Horiuchi, S.; Miyaji, Takeshi; Umemoto, T.; Migenes, V.; Wajima, Kiyoaki; Nakajima, Jun; Morimoto, Manabu; Ellis, J.; Meier, D. L.; Murphy, D. W.; Preston, R. A.; Smith, J. G.; Tingay, S. J.; Traub, Dagmar; Wietfeldt, R. D.; Benson, John M.; Claussen, M. J.; Flatters, C.; Romney, J. D.; Ulvestad, J. S.; D'Addario, Larry R.; Langston, G. I.; Minter, Anthony; Carlson, Brent; Dewdney, P. E.; Jauncey, D. L.; Reynolds, John E.; Taylor, A. R.; McCulloch, P. M.; Cannon, W. H.; Gurvits, L. I.; Mioduszewski, Amy J.; Schilizzi, R. T.; Booth, R. S.

doi:10.1126/science.281.5384.1825

Cited by 168 publications

(94 citation statements)

References 21 publications

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“…In this paper we present a VLBI Space Observatory Programme (VSOP ; Hirabayashi et al 1998) observation of the high-redshift quasar PKS 2215]020. The observations have been conducted as part of a VSOP study of extremely high redshift quasars.…”

Section: Introductionmentioning

confidence: 99%

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VLBI Space Observatory Programme Observation of the Quasar PKS 2215+020: A New Laboratory for Core‐Jet Physics atz = 3.572

Lobanov

Gurvits

Frey³

et al. 2001

ApJ

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We report results of a VLBI Space Observatory Programme (VSOP) observation of a high-redshift quasar, PKS 2215]020 (z \ 3.57). The D1 mas resolution image of the quasar reveals a prominent "" core-jet ÏÏ structure on linear scales from 5 h~1 to 300 h~1 pc h km s~1 Mpc~1). The bright-(H 0 \ 100 ness temperatures and sizes of bright features identiÐed in the jet are consistent with emission from relativistic shocks dominated by adiabatic energy losses. The jet is powered by a central black hole with estimated mass of D4 ] 109Comparisons with VLA and ROSAT observations indicate the pos-M _ . sible presence of an extended radio/X-ray halo surrounding 2215]020.

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Section: Introductionmentioning

confidence: 99%

“…The VSOP is a space VLBI (SVLBI) mission utilizing an orbiting 8 m antenna deployed on the Japanese satellite HAL CA8 (Hirabayashi et al 1998) and the worldwide array of radio telescopes. The satellite has an elliptical orbit, with apogee and perigee heights at^21,000 and^560 km, respectively, and orbital period of roughly 6 hr.…”

Section: Introductionmentioning

confidence: 99%

VLBI Space Observatory Programme Observation of the Quasar PKS 2215+020: A New Laboratory for Core‐Jet Physics atz = 3.572

Lobanov

Gurvits

Frey³

et al. 2001

ApJ

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“…The working group submitted a VSOP-2 mission proposal to ISAS in September 2005. The VSOP-2 mission (Hirabayashi et al 2000) was selected as the 25th scientific mission of JAXA in May 2006 and the VSOP-2 satellite given the developmental name ASTRO-G. VSOP/HALCA was formally an ISAS engineering test mission, but VSOP-2 has been selected as a ISAS/JAXA science mission. To support the ambitious science goals, the ASTRO-G spacecraft requires improvements in both sensitivity and angular resolution when compared with HALCA.…”

Section: Vsop-2/astro-g Projectmentioning

confidence: 99%

“…Launch was on the first flight of the M-V rocket (Hirabayashi et al 1999, Hirabayashi et al 2000 HALCA carried an 8 m diameter center-fed Cassegrain mesh antenna. The on-board radio astronomy subsystem was composed of low-noise amplifiers for three frequency bands, 1.60-1.73 GHz, 4.7-5.0 GHz and 22.0-22.3 GHz.…”

Section: Vsop-1/halca Projectmentioning

confidence: 99%

The next generation space VLBI project, VSOP-2

et al. 2007

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Abstract. The first dedicated space-VLBI project, the VLBI Space Observatory Programme (VSOP), commenced with the successful launch of radio-astronomical satellite HALCA in 1997. Plans for a second generation space-VLBI project have been made by a working group over a number of years. This project, VSOP-2, has now been approved by Japan's space agency, JAXA, as the ASTRO-G project. It is planned for the spacecraft to observe in the 8, 22 and 43 GHz bands with cooled receivers for the two higher bands, which include important maser lines. It will have a maximum angular resolution at 43 GHz (7 mm) of about 40 micro-arcseconds. Although the VSOP project mainly observed continuum emission from active galactic nuclei (AGN), VSOP-2/ASTRO-G is expected to enable a variety of high angular resolution maser line observations.

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“…Here, we report the mas-scale structure of six southern EGRET-identified AGNs with the VLBA and VSOP [2]. VSOP observation can attain a much better angular resolution and a u-v coverage even for southern sources by choosing a favourable observing epoch.…”

Section: Introductionmentioning

confidence: 99%

VSOP and VLBA Observations of EGRET-Identified Active Galactic Nuclei

Wajima¹

2007

Proceedings of 8th European VLBI Network Symposium — PoS(8thEVN)

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We made high-resolution VLBI observations of six southern gamma-ray loud quasars, which were identified by EGRET (Energetic Gamma-Ray Experiment Telescope) on-board gamma-ray detector, with VSOP (VLBI Space Observatory Programme) and the VLBA. All sources show a compact core-dominant structure and the core component of three sources has a brightness temperature greater than 10 12 K in the source's rest frame. Having combined our observations with previous results we conclude that two sources out of three (PKS 0336−019 and PKS 0537−441) have small jet viewing angles. Based on two-epoch VSOP observations, we found that also the third source, PKS 1741−038, has the jet viewing angle smaller than 4.8 • . On the other hand, an observation of PKS 1622−297, exhibiting a spectacular GeV gamma-ray flare, shows rather lower Doppler factor and larger jet viewing angle than those of other gamma-ray-loud active galactic nuclei (AGNs). We examine the gamma-ray emission mechanism in the light of these observations. The 8th European VLBI Network Symposium

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Overview and Initial Results of the Very Long Baseline Interferometry Space Observatory Programme

Cited by 168 publications

References 21 publications

VLBI Space Observatory Programme Observation of the Quasar PKS 2215+020: A New Laboratory for Core‐Jet Physics atz = 3.572

VLBI Space Observatory Programme Observation of the Quasar PKS 2215+020: A New Laboratory for Core‐Jet Physics atz = 3.572

The next generation space VLBI project, VSOP-2

VSOP and VLBA Observations of EGRET-Identified Active Galactic Nuclei

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