RadioAstron continued scientific experiments

In the early part of the scientific program, ground-space interferometer RadioAstron continues. Announce new outstanding research results of distant quasars and protostars of our universe. In the spring of 2013 participants in the program are hoping to double the amount of the available observing time due to the commissioning of the station tracking and data collection RadioAstron in the United States.

 

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Figure 1: latsertidy OJ287, Range 6 cm base projection CRT-Arecibo about 10 Earth diameters (2,100 M?), The signal-to-noise ratio of about 12. Copyright: ASC FIAN

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Figure 2: The quasar 0748 +126, a range of 1.3 cm, the projection base MCT-GBT about 4.3 Earth diameters (4,100 M?), The signal-to-noise ratio of about 8. Copyright: ASC FIAN

 

Ground-space interferometer successfully registered radiation ultra-compact regions of galactic nuclei OJ287, BL Lac, 0716 714, 0823 033, 1823 568 on the bases of 6 to 11 Earth diameters in the range of 6 and / or 18 cm There are also indications successful measurements on large bases still interferometer, which are currently being tested. There are the first successful results in the range of 1.3 cm, while in the range of 2.5 to 4.3 Earth diameters for galaxies 0716 +714, and +126 0748 1749 096. For many of these facilities provide estimates of brightness temperature values close to or in excess of 1013 K, which is essential to study the physics of synchrotron radiation in the cores of galaxies. If this result is confirmed for bolshego of quasars, it will force scientists to reconsider their current understanding of the physics of light jets in quasars.

The illustrations 1 and 2 show the response of interference with radio astronomer observations of active galactic nuclei. (The vertical axis: the ratio of signal-to-noise ratio, horizontal axis: the residual value of the delay and frequency interference).

 

In the early part of the scientific program RadioAstron were also conducted successful observations of water masers in the object Cepheus A. This object is located 720 parsecs from the Sun and contains a cluster of massive young stars and protostars, which is formed in the vicinity of the maser emission of different molecules. Correlated signal was obtained between the space radio telescope Spektr-R project RadioAstron and 40-m radio telescope in the ground Yebese (Spain) as part of the interferometric session held on November 18, 2012 The projection of the base ground-space interferometer was a record for the observations of masers value? Earth’s diameter is about 3.5, which provided an angular resolution of 60 microseconds of arc. Analysis of the data shows that the sharp signal at the space-based member of the short-lived parts of the maser, which appeared as a result of the outbreak.

 

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Figure 3: The spectrum of the water maser in the star forming region Cepheus A, obtained at the 40th radio telescope in Yebese (Spain).

Copyright: ASC FIAN

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Figure 4: Cross-correlation spectrum of the compact parts (corresponding to the lowest-frequency detail in the full spectrum), resulting in a combination of 10-m space telescope (CMT) and 40-m radio telescope in Yebese. The accumulation time is 570 seconds. The axes: the value correlated flux in arbitrary units and the phase in radians depending on the frequency of the spectral parts in MHz.Copyright: ASC FIAN

 

 

/ 15.01.2013 / According to the materials ANI "LPI-Inform"

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