Zobrazeno 1 - 10
of 95
pro vyhledávání: '"Teraesranta, H."'
Autor:
Agudo, I., Krichbaum, T. P., Bach, U., Pagels, A., Graham, D., Alef, W., Witzel, A., Zensus, J. A., Bremer, M., Grewing, M., Teräsranta, H.
The Global mm-VLBI Array is at present the most sensitive 3 mm-VLBI interferometer and provides images of up to 40 micro-arcsecond resolution. Using this array, we have monitored the rotation of the innermost jet in the quasar NRAO 150, which shows a
Externí odkaz:
http://arxiv.org/abs/astro-ph/0511268
A very detailed monitoring of a radio flare in the Seyfert I galaxy III Zw 2 with the VLA and the VLBA is presented. The relative astrometry in the VLBA observations was precise on a level of a few microarcseconds. Spectral and spatial evolution of t
Externí odkaz:
http://arxiv.org/abs/astro-ph/0501616
Autor:
Ravasio, M., Tagliaferri, G., Ghisellini, G., Boettcher, M., Aller, H. D., Aller, M. F., Mang, O., Maraschi, L., Massaro, E., Raiteri, C. M., Villata, M., Teraesranta, H.
We present two BeppoSAX observations of BL Lacertae as part of a multiwavelength radio-to-TeV campaign. During the first observation we observe a faint Compton spectrum, while during the second, we detect a synchrotron spectrum with the highest [2-10
Externí odkaz:
http://arxiv.org/abs/astro-ph/0210415
Autor:
Boettcher, M., Aller, H. D., Aller, M. F., Mang, O., Raiteri, C. M., Ravasio, M., Tagliaferri, G., Teraesranta, H., Villata, M.
We have organized an extensive multiwavelength campaign on BL Lacertae in the second half of 2000. Simultaneous or quasi-simultaneous observations were taken at radio frequencies, in the optical - carried out by the WEBT collaboration -, in X-rays -
Externí odkaz:
http://arxiv.org/abs/astro-ph/0203379
So far, all relativistically boosted jets with superluminal motion have only been detected in typical radio galaxies with early type host galaxies. We have now discovered superluminal motion in the Seyfert I galaxy III Zw 2, classified as a spiral. T
Externí odkaz:
http://arxiv.org/abs/astro-ph/0009468
Autor:
Watson, D., Smith, N., Hanlon, L., McBreen, B., Quilligan, F., Tashiro, M., Metcalfe, L., Doyle, P., Teraesranta, H., Carraminana, A., Guichard, J.
Publikováno v:
Astronomy and Astrophysics, v.364, p.43-52 (2000)
The high redshift (z=0.997) blazar B2 1308+326 was observed contemporaneously at x-ray, optical and radio wavelengths in June 1996. The x-ray observations were performed with ASCA. The ASCA results were found to be consistent with reanalysed data fro
Externí odkaz:
http://arxiv.org/abs/astro-ph/0009202
Autor:
Brunthaler, Andreas, Falcke, Heino, Bower, Geoffrey C., Aller, M. F., Aller, H. D., Teraesranta, H., Lobanov, A. P., Krichbaum, T. P., Patnaik, A. R.
So far all relativistically boosted jets with superluminal motion have only been detected in typical radio galaxies with early type host galaxies. We have now discovered superluminal motion in the Seyfert I galaxy III Zw 2, classified as a spiral. Su
Externí odkaz:
http://arxiv.org/abs/astro-ph/0004256
Autor:
Collmar, W., Benlloch, S., Grove, J. E., Hartman, R. C., Heindl, W. A., Kraus, A., Teraesranta, H., Villata, M., Bennett, K., Bloemen, H., Johnson, W. N., Krichbaum, T. P., Raiteri, C. M., Ryan, J., Sobrito, G., Schoenfelder, V., Williams, O. R., Wilms, J.
We report first observational results of multifrequency campaigns on the prominent Virgo blazars 3C 273 and 3C 279 which were carried out in January and February 1999. Both blazars are detected from radio to gamma-ray energies. We present the measure
Externí odkaz:
http://arxiv.org/abs/astro-ph/0004061
Autor:
Watson, D., Hanlon, L., McBreen, B., Smith, N., Tashiro, M., Foley, A. R., Metcalfe, L., Beckmann, V., Sanchez, S. F., Teraesranta, H.
Publikováno v:
Astron.Astrophys.345:414-418,1999
Radio and optical observations of the possible microlensed BL Lac source MS 0205.7+3509 were obtained simultaneously with ASCA x-ray measurements in February 1997. A single power law model, with a photon index of 2.61, is an adequate fit to the ASCA
Externí odkaz:
http://arxiv.org/abs/astro-ph/9903044
Autor:
Maisack, M., Mannheim, K., Geckeler, R. D., Hillas, M., Katajainen, S., Marshall, F., Petry, D., Montigny, C. v., Paubert, G., Rose, J., Sillanpaeae, A., Takalo, L. O., Teraesranta, H.
We report preliminary results of a multi-frequency campaign on the TeV candidate blazar W Comae (z=0.102). Flux limits by Whipple and HEGRA show that the TeV flux must be considerably below an E^-2 extrapolation of the EGRET flux. In the framework of
Externí odkaz:
http://arxiv.org/abs/astro-ph/9706243