Zobrazeno 1 - 10
of 76
pro vyhledávání: '"Meier, D. L."'
Autor:
Kravchenko, E. V., Giroletti, M., Hada, K., Meier, D. L., Nakamura, M., Park, J., Walker, R. C.
We report on high angular resolution polarimetric observations of the nearby radio galaxy M87 using the Very Long Baseline Array at 24 GHz ($\lambda=$1.3 cm) and 43 GHz ($\lambda=$7 mm) in 2017-2018. New images of the linear polarization substructure
Externí odkaz:
http://arxiv.org/abs/2006.07059
Autor:
Cohen, M. H., Aller, H. D., Aller, M. F., Hovatta, T., Kharb, P., Kovalev, Y. Y., Lister, M. L., Meier, D. L., Pushkarev, A. B., Savolainen, T.
Publikováno v:
ApJ 862 (2018) 1
We have obtained a smooth time series for the Electric Vector Position Angle (EVPA) of the blazar OJ 287 at centimeter wavelengths, by making $\pm n\pi$ adjustments to archival values from 1974 to 2016. The data display rotation reversals in which th
Externí odkaz:
http://arxiv.org/abs/1806.02870
Autor:
Walton, D. J., Mooley, K., King, A. L., Tomsick, J. A., Miller, J. M., Dauser, T., Garcia, J., Bachetti, M., Brightman, M., Fabian, A. C., Forster, K., Fuerst, F., Gandhi, P., Grefenstette, B. W., Harrison, F. A., Madsen, K. K., Meier, D. L., Middleton, M. J., Natalucci, L., Rahoui, F., Rana, V., Stern, D.
We present first results from a series of $NuSTAR$ observations of the black hole X-ray binary V404 Cyg obtained during its summer 2015 outburst, primarily focusing on observations during the height of this outburst activity. The $NuSTAR$ data show e
Externí odkaz:
http://arxiv.org/abs/1609.01293
Autor:
Cohen, M. H., Meier, D. L., Arshakian, T. G., Clausen-Brown, E., Homan, D. C., Hovatta, T., Kovalev, Y. Y., Lister, M. L., Pushkarev, A. B., Richards, J. L., Savolainen, T.
Publikováno v:
The Astrophysical Journal 803 (2015) 3
We study the kinematics of ridge lines on the pc-scale jet of the active galactic nucleus BL Lac. We show that the ridge lines display transverse patterns that move superluminally downstream, and that the moving patterns are analogous to waves on a w
Externí odkaz:
http://arxiv.org/abs/1409.3599
Autor:
Cohen, M. H., Meier, D. L., Arshakian, T. G., Homan, D. C., Hovatta, T., Kovalev, Y. Y., Lister, M. L., Pushkarev, A. B., Richards, J. L., Savolainen, T.
Publikováno v:
Astrophysical Journal 787 (2014) 151
Parsec-scale VLBA images of BL Lac at 15 GHz show that the jet contains a permanent quasi-stationary emission feature 0.26 mas (0.34 pc projected) from the core, along with numerous moving features. In projection, the tracks of the moving features cl
Externí odkaz:
http://arxiv.org/abs/1404.0976
Autor:
Baloković, M., Ajello, M., Blandford, R. D., Boggs, S. E., Borracci, F., Chiang, J., Christensen, F. E., Craig, W. W., Forster, K., Furniss, A., Fuerst, F., Ghisellini, G., Giebels, B., Giommi, P., Grefenstette, B. W., Hailey, C. J., Harrison, F. A., Hayashida, M., Humensky, B., Inoue, Y., Koglin, J. E., Krawczynski, H., Madejski, G. M., Madsen, K. K., Meier, D. L., Nelson, T., Ogle, P., Paneque, D., Perri, M., Puccetti, S., Reynolds, C. S., Sbarrato, T., Stern, D., Tagliaferri, G., Urry, C. M., Wehrle, A. E., Zhang, W. W.
Mkn 421 is a nearby active galactic nucleus dominated at all wavelengths by a very broad non-thermal continuum thought to arise from a relativistic jet seen at a small angle to the line of sight. Its spectral energy distribution peaks in the X-ray an
Externí odkaz:
http://arxiv.org/abs/1309.4494
Autor:
King, O. G., Hovatta, T., Max-Moerbeck, W., Meier, D. L., Pearson, T. J., Readhead, A. C. S., Reeves, R., Richards, J. L., Shepherd, M. C.
The OVRO 40-m telescope has been monitoring the 15 GHz radio flux density of over 1200 blazars since 2008. The 15 GHz light curve of the flat spectrum radio quasar J1359+4011 shows a strong and persistent quasi-periodic oscillation. The time-scale of
Externí odkaz:
http://arxiv.org/abs/1309.1158
The physical conditions in the inner parsec of accretion disks believed to orbit the central black holes in active galactic nuclei can be probed by imaging the absorption of background radio emission by ionized gas in the disk. We report high angular
Externí odkaz:
http://arxiv.org/abs/astro-ph/0003119
Publikováno v:
NewAstron.Rev.46:235-238,2002
The structure of AGN accretion disks on sub-parsec scales can be probed through free-free absorption of synchrotron emission from the base of symmetric radio jets. We present new VLBA observations of the nearby FR-I radio galaxy NGC 4261 at 22 and 43
Externí odkaz:
http://arxiv.org/abs/astro-ph/9912525
Autor:
Shen, Z. -Q., Wan, T. -S., Moran, J. M., Jauncey, D. L., Reynolds, J. E., Tzioumis, A. K., Gough, R. G., Ferris, R. H., Sinclair, M. W., Jiang, D. -R., Hong, X. -Y., Liang, S. -G., Edwards, P. G., Costa, M. E., Tingay, S. J., McCulloch, P. M., Lovell, J. E. J., King, E. A., Nicolson, G. D., Murphy, D. W., Meier, D. L., van Ommen, T. D., White, G. L.
We report the results of a 5-GHz southern-hemisphere snapshot VLBI observation of a sample of blazars. The observations were performed with the Southern Hemisphere VLBI Network plus the Shanghai station in 1993 May. Twenty-three flat-spectrum, radio-
Externí odkaz:
http://arxiv.org/abs/astro-ph/9803104