Zobrazeno 1 - 10
of 172
pro vyhledávání: '"Fey, A. L."'
Autor:
Charlot, P., Jacobs, C. S., Gordon, D., Lambert, S., de Witt, A., Böhm, J., Fey, A. L., Heinkelmann, R., Skurikhina, E., Titov, O., Arias, E. F., Bolotin, S., Bourda, G., Ma, C., Malkin, Z., Nothnagel, A., Mayer, D., MacMillan, D. S., Nilsson, T., Gaume, R.
Publikováno v:
A&A 644, A159 (2020)
A new realization of the International Celestial Reference Frame (ICRF) is presented based on the work achieved by a working group of the International Astronomical Union (IAU) mandated for this purpose. This new realization, referred to as ICRF3, is
Externí odkaz:
http://arxiv.org/abs/2010.13625
Autor:
Piner, B. G., Pushkarev, A. B., Kovalev, Y. Y., Marvin, C. J., Arenson, J. G., Charlot, P., Fey, A. L., Collioud, A., Voitsik, P. A.
Publikováno v:
the Astrophysical Journal 758 (2012) id.84
(Abridged) We analyze blazar jet apparent speeds and accelerations from the RDV series of astrometric and geodetic VLBI experiments. From these experiments, we have produced and analyzed 2753 global VLBI images of 68 sources at 8 GHz with a median be
Externí odkaz:
http://arxiv.org/abs/1208.4399
Autor:
Hungwe, F., Ojha, R., Booth, R. S., Bietenholz, M. F., Collioud, A., Charlot, P., Boboltz, D., Fey, A. L.
We present a detailed multi-epoch analysis of 31 potential southern hemisphere radio calibrators that were originally observed as part of a program to maintain the International Celestial Reference Frame (ICRF). At radio wavelengths, the primary cali
Externí odkaz:
http://arxiv.org/abs/1106.2669
Autor:
Ojha, Roopesh, Kadler, Matthias, Böck, Moritz, Booth, Roy, Dutka, M. S., Edwards, P. G., Fey, A. L., Fuhrmann, L., Gaume, R. A., Hase, H., Horiuchi, S., Jauncey, D. L., Johnston, K. J., Katz, U., Lister, M., Lovell, J. E. J., Müller, C., Plötz, C., Quick, J. F. H., Ros, E., Taylor, G. B., Thompson, D. J., Tingay, S. J., Tosti, G., Tzioumis, A. K., Wilms, J., Zensus, J. A.
We introduce the TANAMI program (Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry) which is monitoring an initial sample of 43 extragalactic jets located south of -30 degrees declination at 8.4 GHz and 22 GHz since 2007. All
Externí odkaz:
http://arxiv.org/abs/1005.4432
Autor:
Charlot, P., Boboltz, D. A., Fey, A. L., Fomalont, E. B., Geldzahler, B. J., Gordon, D., Jacobs, C. S., Lanyi, G. E., Ma, C., Naudet, C. J., Romney, J. D., Sovers, O. J., Zhang, L. D.
We have measured the sub-milli-arcsecond structure of 274 extragalactic sources at 24 and 43 GHz in order to assess their astrometric suitability for use in a high frequency celestial reference frame (CRF). Ten sessions of observations with the Very
Externí odkaz:
http://arxiv.org/abs/1003.1067
Autor:
Ojha, Roopesh, Kadler, M., Böck, M., Booth, R., Dutka, M. S., Edwards, P. G., Fey, A. L., Fuhrmann, L., Gaume, R. A., Hase, H., Horiuchi, S., Jauncey, D. L., Johnston, K. J., Katz, U., Lister, M., Lovell, J. E. J., Müller, C., Plötz, C., Quick, J. F. H., Ros, E., Taylor, G. B., Thompson, D. J., Tingay, S. J., Tosti, G., Tzioumis, A. K., Wilms, J., Zensus, J. A.
The TANAMI (Tracking AGN with Austral Milliarcsecond Interferometry) and associated programs provide comprehensive radio monitoring of extragalactic gamma-ray sources south of declination -30 degrees. Joint quasi-simultaneous observations between the
Externí odkaz:
http://arxiv.org/abs/1001.0059
Autor:
Mueller, Cornelia, Kadler, Matthias, Ojha, Roopesh, Boeck, M., Booth, R., Dutka, M. S., Edwardsk, P., Fey, A. L., Fuhrmann, L., Hase, H., Horiuchi, S., Jauncey, D. L., Johnston, K. J., Katz, U., Lister, M., Lovell, J. E. J., Ploetz, C., Quick, J. F. H., Ros, E., Taylor, G. B., Thompson, D. J., Tingay, S. J., Tosti, G., Tzioumisk, A. K., Wilms, J., Zensus, J. A.
We present a summary of the observation strategy of TANAMI (Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry), a monitoring program to study the parsec-scale structure and dynamics of relativistic jets in active galactic nuc
Externí odkaz:
http://arxiv.org/abs/0912.3810
Autor:
Mueller, Cornelia, Kadler, Matthias, Ojha, Roopesh, Boeck, M., Booth, R., Dutka, M. S., Edwardsk, P., Fey, A. L., Fuhrmann, L., Hase, H., Horiuchi, S., Jauncey, D. L., Johnston, K. J., Katz, U., Lister, M., Lovell, J. E. J., Ploetz, C., Quick, J. F. H., Ros, E., Taylor, G. B., Thompson, D. J., Tingay, S. J., Tosti, G., Tzioumisk, A. K., Wilms, J., Zensus, J. A.
TANAMI (Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry) is a monitoring program to study the parsec-scale structures and dynamics of relativistic jets in active galactic nuclei (AGN) of the Southern Hemisphere with the Lon
Externí odkaz:
http://arxiv.org/abs/0912.0686
Autor:
Unwin, Stephen C., Shao, Michael, Tanner, Angelle M., Allen, Ronald J., Beichman, Charles A., Boboltz, David, Catanzarite, Joseph H., Chaboyer, Brian C., Ciardi, David R., Edberg, Stephen J., Fey, Alan L., Fischer, Debra A., Gelino, Christopher R., Gould, Andrew P., Grillmair, Carl, Henry, Todd J., Johnston, Kathryn V., Johnston, Kenneth J., Jones, Dayton L., Kulkarni, Shrinivas R., Law, Nicholas M., Majewski, Steven R., Makarov, Valeri V., Marcy, Geoffrey W., Meier, David L., Olling, Rob P., Pan, Xiaopei, Patterson, Richard J., Pitesky, Jo Eliza, Quirrenbach, Andreas, Shaklan, Stuart B., Shaya, Edward J., Strigari, Louis E., Tomsick, John A., Wehrle, Ann E., Worthey, Guy
Precision astrometry at microarcsecond accuracy has application to a wide range of astrophysical problems. This paper is a study of the science questions that can be addressed using an instrument that delivers parallaxes at about 4 microarcsec on tar
Externí odkaz:
http://arxiv.org/abs/0708.3953
Autor:
Lazio, T. J. W., Ojha, R., Fey, A. L., Kedziora-Chudczer, L., Cordes, J. M., Jauncey, D. L., Lovell, J. E. J.
We analyze a sample of 58 multi-wavelength, Very Long Baseline Array observations of active galactic nuclei (AGN) to determine their scattering properties. Approximately 75% of the sample consists of AGN that exhibit centimeter-wavelength intraday va
Externí odkaz:
http://arxiv.org/abs/0707.1778