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Query : 2009MNRAS.392.1339M |
2009MNRAS.392.1339M - Mon. Not. R. Astron. Soc., 392, 1339-1362 (2009/February-1)
Probing the microarcsecond structure of the Circinus megamasers through diffractive interstellar scintillation.
McCALLUM J.N., ELLINGSEN S.P., LOVELL J.E.J., PHILLIPS C.J. and REYNOLDS J.E.
Abstract (from CDS):
The very long baseline interferometry (VLBI) images are consistent with previous high-resolution observations and show maser emission arising both in a circumnuclear accretion disc, and in a low-velocity outflow. We find no systematic differences in the variability properties of the disc and outflow masers. The VLBI images reveal that there is considerable spectral blending in single-dish spectra of the Circinus megamasers.
In addition to the VLBI imaging we also used these observations to look for a time delay in the intensity variations observed at the different telescopes in the array, as expected for scintillation-induced variability. No time delay was detected, which allows us to place a lower limit on the velocity of the interstellar medium during these observations 22 km/s for the second epoch. We conclude that any future attempts to measure a time delay in this source should utilize intercontinental baselines to increase the chances of success.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): masers - Scattering - galaxies: individual: Circinus
Simbad objects: 9
Number of rows : 9 |
N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | QSO B0405-385 | QSO | 04 06 59.03533781 | -38 26 28.0423651 | 19.55 | 18.0 | ~ | 233 | 2 | |||
2 | NGC 3079 | Sy2 | 10 01 57.8789863992 | +55 40 47.449758324 | 11.57 | 11.54 | 10.86 | ~ | 1391 | 3 | ||
3 | QSO B1144-3755 | BLL | 11 47 01.37071212 | -38 12 11.0235229 | 19.03 | 16.2 | 16.72 | ~ | 300 | 1 | ||
4 | M 106 | Sy2 | 12 18 57.620 | +47 18 13.39 | 9.14 | 8.41 | 8.11 | ~ | 2364 | 3 | ||
5 | QSO J1300-3253 | QSO | 13 00 42.4259780568 | -32 53 12.114395844 | 18.70 | 18 | ~ | 84 | 1 | |||
6 | NAME Circinus Galaxy | Sy2 | 14 13 09.906 | -65 20 20.47 | 10.89 | 9.84 | 10.6 | 10.0 | ~ | 1217 | 2 | |
7 | QSO B1424-41 | QSO | 14 27 56.29756617 | -42 06 19.4376238 | 18.48 | 17.7 | 16.30 | ~ | 496 | 1 | ||
8 | NGC 6328 | QSO | 17 23 41.02933859 | -65 00 36.6106377 | 13.17 | 13.2 | 11.45 | 12.2 | ~ | 246 | 1 | |
9 | ICRF J181926.5+384501 | SyG | 18 19 26.54735971 | +38 45 01.7860362 | ~ | 118 | 0 |
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