Zobrazeno 1 - 10
of 621
pro vyhledávání: '"Kellermann K"'
Autor:
Kellermann, K. I.
I review the scientific and technical history of the Search for Extraterrestrial Intelligence (SETI), discuss the impact of the political involvement, and speculate on the nature of a successful detection and its potential social and cultural impact.
Externí odkaz:
http://arxiv.org/abs/2302.06446
Autor:
Homan, D. C., Cohen, M. H., Hovatta, T., Kellermann, K. I., Kovalev, Y. Y., Lister, M. L., Popkov, A. V., Pushkarev, A. B., Ros, E., Savolainen, T.
Publikováno v:
ApJ 923 (2021) 67
We present multi-epoch, parsec-scale core brightness temperature observations of 447 AGN jets from the MOJAVE and 2cm Survey programs at 15 GHz from 1994 to 2019. The brightness temperature of each jet over time is characterized by its median value a
Externí odkaz:
http://arxiv.org/abs/2109.04977
Autor:
Lister, M. L., Homan, D. C., Kellermann, K. I., Kovalev, Y. Y., Pushkarev, A. B., Ros, E., Savolainen, T.
Publikováno v:
ApJ 923 (2021) 30
We have analyzed the parsec-scale jet kinematics of 447 bright radio-loud AGN, based on 15 GHz VLBA data obtained between 1994 August 31 and 2019 August 4. We present new total intensity and linear polarization maps obtained between 2017 January 1 to
Externí odkaz:
http://arxiv.org/abs/2108.13358
Autor:
Cheng, X. -P., An, T., Frey, S., Hong, X. -Y., He, X., Kellermann, K. I., Lister, M. L., Lao, B. -Q., Li, X. -F., Mohan, P., Yang, J., Wu, X. -C., Zhang, Z. -L., Zhang, Y. -K., Zhao, W.
Publikováno v:
Astrophysical Journal Supplement Series, Vol. 247, id. 57 (2020)
We present the observational results from the 43-GHz Very Long Baseline Array (VLBA) observations of 124 compact radio-loud active galactic nuclei (AGNs) that were conducted between 2014 November and 2016 May. The typical dimensions of the restoring
Externí odkaz:
http://arxiv.org/abs/2003.01382
Autor:
Lister, M. L., Homan, D. C., Hovatta, T., Kellermann, K. I., Kiehlmann, S., Kovalev, Y. Y., Max-Moerbeck, W., Pushkarev, A. B., Readhead, A. C. S., Ros, E., Savolainen, T.
Publikováno v:
ApJ 874 (2019) 43
We present results from a parsec-scale jet kinematics study of 409 bright radio-loud AGNs based on 15 GHz VLBA data obtained between 1994 August 31 and 2016 December 26 as part of the 2cm VLBA survey and MOJAVE programs. We tracked 1744 individual br
Externí odkaz:
http://arxiv.org/abs/1902.09591
Autor:
Cotton, W. D., Condon, J. J., Kellermann, K. I., Lacy, M., Perley, R. A., Matthews, A. M., Vernstrom, T., Scott, Douglas, Wall, J. V.
Publikováno v:
Astrophysical Journal, Volume 856, Issue 1, article id. 67, 11pp (2018)
We made two new sensitive (rms noise sigma_n ~ 1 microJy/beam) high resolution (theta = 3.0" and theta = 0.66" FWHM) S--band (2 < nu < 4 GHz) images covering a single JVLA primary beam (FWHM ~ 14') centered on J2000 RA = 10 46, Dec = 59 01 in the Loc
Externí odkaz:
http://arxiv.org/abs/1802.04209
Autor:
Cheng, X. -P., An, T., Hong, X. -Y., Yang, J., Mohan, P., Kellermann, K. I., Lister, M. L., Frey, S., Zhao, W., Zhang, Z. -L., Wu, X. -C., Li, X. -F., Zhang, Y. -K.
Radio-loud active galactic nuclei (AGNs), hosting powerful relativistic jet outflows, provide an excellent laboratory for studying jet physics. Very long baseline interferometry (VLBI) enables high-resolution imaging on milli-arcsecond (mas) and sub-
Externí odkaz:
http://arxiv.org/abs/1712.06314
Autor:
Singal, J., Haider, J., Ajello, M., Ballantyne, D. R., Bunn, E., Condon, J., Dowell, J., Fixsen, D., Fornengo, N., Harms, B., Holder, G., Jones, E., Kellermann, K., Kogut, A., Linden, T., Monsalve, R., Mertsch, P., Murphy, E., Orlando, E., Regis, M., Scott, D., Vernstrom, T., Xu, L.
Publikováno v:
PASP, 2018, 130, 985
We summarize the radio synchrotron background workshop that took place July 19-21, 2017 at the University of Richmond. This first scientific meeting dedicated to the topic was convened because current measurements of the diffuse radio monopole reveal
Externí odkaz:
http://arxiv.org/abs/1711.09979
We discuss 6 GHz JVLA observations covering a volume-limited sample of 178 low redshift ($0.2 < z < 0.3$) optically selected QSOs. Our 176 radio detections fall into two clear categories: (1) About $20$\% are radio-loud QSOs (RLQs) having spectral lu
Externí odkaz:
http://arxiv.org/abs/1608.04586
Autor:
Lister, M. L., Aller, M. F., Aller, H. D., Homan, D. C., Kellermann, K. I., Kovalev, Y. Y., Pushkarev, A. B., Richards, J. L., Ros, E., Savolainen, T.
Publikováno v:
Astronomical Journal 152 (2016) 12
We present 1625 new 15 GHz (2 cm) VLBA images of 295 jets associated with active galactic nuclei (AGNs) from the MOJAVE and 2 cm VLBA surveys, spanning observations between 1994 Aug 31 and 2013 Aug 20. For 274 AGNs with at least 5 VLBA epochs, we hav
Externí odkaz:
http://arxiv.org/abs/1603.03882