2011-2012:reasearch
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| Together with Chinese astronomers from Shanghai (Z. Shen, X. Hong, B. Xia, F. Shu) and Yunnan Astronomical Observatories (Z. Li, Y. Xu), JIVE astronomers (J. Yang/PI, Z. Paragi, L.I. Gurvits, R.M. Campbell) investigated a newly-identified Galactic black hole binary candidate MAXI J1836-194 with the e-EVN and the Chinese VLBI Network. The team successfully detected the low-declination source with a high confidence level in both observations. The source was unresolved, which is in agreement with an AU-scale compact jet (Yang et al. 2012, MNRAS, L66). | Together with Chinese astronomers from Shanghai (Z. Shen, X. Hong, B. Xia, F. Shu) and Yunnan Astronomical Observatories (Z. Li, Y. Xu), JIVE astronomers (J. Yang/PI, Z. Paragi, L.I. Gurvits, R.M. Campbell) investigated a newly-identified Galactic black hole binary candidate MAXI J1836-194 with the e-EVN and the Chinese VLBI Network. The team successfully detected the low-declination source with a high confidence level in both observations. The source was unresolved, which is in agreement with an AU-scale compact jet (Yang et al. 2012, MNRAS, L66). | ||
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| //VLBI total intensity images of MAXI J1836−194. The synthesized beams are plotted in the bottom left-hand corner. The contours start from 3 sigma off-source noise level (0.54 mJy/beam at 8.3 GHz, 0.24 mJy/beam at 5 GHz) and increase by a factor of 2.// | //VLBI total intensity images of MAXI J1836−194. The synthesized beams are plotted in the bottom left-hand corner. The contours start from 3 sigma off-source noise level (0.54 mJy/beam at 8.3 GHz, 0.24 mJy/beam at 5 GHz) and increase by a factor of 2.// | ||
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| Working with Fang Wu (ShAO, China) and Tao An (ShAO, China), Jun Yang and Zsolt Paragi imaged the jet in the broad absorption line quasar PG 1700+518. They presented its jet structure on scales of parsec to kiloparsec for the first time (Yang et al. 2012, MNRAS, 419, L74). The source shows two distinct jet features in East-West direction with a separation of around 4 kpc in the VLA image. They identified the radio core and found a symmetric jet morphology in the western jet feature with the EVN observations. The jet axis is nearly parallel to the scattering plane revealed earlier by optical polarimetry. They conclude that the jet likely has a viewing angle around 45 degree by analogy to polar-scattered Seyfert 1 galaxies. Furthermore, | Working with Fang Wu (ShAO, China) and Tao An (ShAO, China), Jun Yang and Zsolt Paragi imaged the jet in the broad absorption line quasar PG 1700+518. They presented its jet structure on scales of parsec to kiloparsec for the first time (Yang et al. 2012, MNRAS, 419, L74). The source shows two distinct jet features in East-West direction with a separation of around 4 kpc in the VLA image. They identified the radio core and found a symmetric jet morphology in the western jet feature with the EVN observations. The jet axis is nearly parallel to the scattering plane revealed earlier by optical polarimetry. They conclude that the jet likely has a viewing angle around 45 degree by analogy to polar-scattered Seyfert 1 galaxies. Furthermore, | ||
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| //The VLA and EVN intensity images of PG 1700+518. The contours start from 3σ off-source noise level (VLA: 0.036 mJy/beam, EVN: 0.15 mJy/beam) and increase by a factor of 2. // | //The VLA and EVN intensity images of PG 1700+518. The contours start from 3σ off-source noise level (VLA: 0.036 mJy/beam, EVN: 0.15 mJy/beam) and increase by a factor of 2. // | ||
| Jun Yang, Zsolt Paragi, Leonid Gurvits, Robert M. Campbell, and Alexander van der Horst (University of Amsterdam) have initiated a campaign in directly observing the motion of the relativistic jet in the tidal disruption event Swift J1644+57. Currently, they have observed the transient AGN at four epochs. The preliminary results show that a position precision of ~15 micro-arcseconds can be achieved with respect to an in-beam calibrator (FIRST J1644+5736, 2.8 arcmin away). With more such high-precision observations, | Jun Yang, Zsolt Paragi, Leonid Gurvits, Robert M. Campbell, and Alexander van der Horst (University of Amsterdam) have initiated a campaign in directly observing the motion of the relativistic jet in the tidal disruption event Swift J1644+57. Currently, they have observed the transient AGN at four epochs. The preliminary results show that a position precision of ~15 micro-arcseconds can be achieved with respect to an in-beam calibrator (FIRST J1644+5736, 2.8 arcmin away). With more such high-precision observations, | ||
| - | {{2011-2012: | + | {{2011-2012: |
| - | //The EVN phase-referencing observations of Swift J1644+57 and its in-beam calibrator FIRST J1644+5736 (a separation of 2.8 arcmin). The background color image is the WSRT map (no primary beam correction). Contours start from the 3 noise level. Each increases by a factor of 4. Natural weighting was used.// | + | //The EVN phase-referencing observations of Swift J1644+57 and its in-beam calibrator FIRST J1644+5736 (a separation of 2.8 arcmin). The background color image is the WSRT map (no primary beam correction). Contours start from the 3 noise level. Each increases by a factor of 4. Natural weighting was used.// |
2011-2012/reasearch.1362056386.txt.gz · Last modified: 2013/02/28 12:59 by yang