Zobrazeno 1 - 10
of 123
pro vyhledávání: '"Aller Hugh D."'
Autor:
Tripathi, Ashutosh, Gupta, Alok C., Smith, Krista Lynne, Wiita, Paul J., Aller, Margo F., Volvach, Alexandr E., Lähteenmäki, Anne, Aller, Hugh D., Tornikoski, Merja, Volvach, Larisa N.
Publikováno v:
The Astrophysical Journal, Volume 977, Number 2, 166 (2024)
We examine lengthy radio light curves of the flat spectrum radio galaxy 3C 454.3 for possible quasi-periodic oscillations (QPOs). The data used in this work were collected at five radio frequencies, 4.8, 8.0, 14.5, 22.0, and 37.0 GHz between 1979--20
Externí odkaz:
http://arxiv.org/abs/2412.10771
Autor:
Zuo, Wenwen, Gupta, Alok C., Gu, Minfeng, Valtonen, Mauri J., Jorstad, Svetlana G., Aller, Margo F., Lähteenmäki, Anne, Kiehlmann, Sebastian, Kushwaha, Pankaj, Aller, Hugh D., Chen, Liang, Readhead, Anthony C. S., Tornikoski, Merja, Yuan, Qi
Using nearly simultaneous radio, near-infrared, optical, and ultraviolet data collected since 2009, we constructed 106 spectral energy distributions (SEDs) of the blazar OJ 287. These SEDs were well-fitted by a log-parabolic model. By classifying the
Externí odkaz:
http://arxiv.org/abs/2412.10752
Autor:
A, Krishna Mohana, Gupta, Alok C., Marscher, Alan P., Sotnikova, Yulia V., Jorstad, S. G., Wiita, Paul J., Cui, Lang, Aller, Margo F., Aller, Hugh D., Kovalev, Yu. A., Kovalev, Y. Y., Liu, Xiang, Mufakharov, T. V., Popkov, A. V., Mingaliev, M. G., Erkenov, A. K., Nizhelsky, N. A., Tsybulev, P. G., Zhao, Wei, Weaver, Z. R., Morozova, D. A.
Publikováno v:
MNRAS 527 (2024) 6970
We present the results of our study of cross-correlations between long-term multi-band observations of the radio variability of the blazar 3C 279. More than a decade (2008-2022) of radio data were collected at seven different frequencies ranging from
Externí odkaz:
http://arxiv.org/abs/2311.02395
Autor:
Goyal, Arti, Soida, Marian, Stawarz, Lukasz, Wiita, Paul J., Nilsson, Kari, Jorstad, Svetlana, Marscher, Alan P., Aller, Margo F., Aller, Hugh D., Lahteenmaki, Anne, Hovatta, Talvikki, Zola, Staszek, Nalewajko, Krzysztof, Tornikoski, Merja, Tammi, Joni, Hodges, Mark, Kiehlmann, Sebastian, Readhead, Anthony C. S., Max-Moerbeck, Walter, Lindfors, Elina, Ramazani, Vandad Fallah, Reichart, D. E., Caton, D. B., Valverde, Janeth, Horan, Deirdre, Ojha, Roopesh, van Zyl, Pfesesani
We present the results of variability power spectral density (PSD) analysis using multiwavelength radio to GeV\,$\gamma$-ray light curves covering decades/years to days/minutes timescales for the blazars 3C 279 and PKS 1510-089. The PSDs are modeled
Externí odkaz:
http://arxiv.org/abs/2112.04194
Autor:
Britzen, Silke, Zajaček, Michal, Popović, Luka Č., Fendt, Christian, Tramacere, Andrea, Pashchenko, Ilya N., Jaron, Frédéric, Pánis, Radim, Petrov, Leonid, Aller, Margo F., Aller, Hugh D.
On 2019/07/30.86853 UT, IceCube detected a high-energy astrophysical neutrino candidate. The Flat Spectrum Radio Quasar PKS 1502+106 is located within the 50 percent uncertainty region of the event. Our analysis of 15 GHz Very Long Baseline Array (VL
Externí odkaz:
http://arxiv.org/abs/2103.00292
Publikováno v:
EPJ Web of Conferences, Vol 61, p 07002 (2013)
As part of a program to investigate jet flow conditions during GeV gamma-ray flares detected by Fermi, we are using UMRAO multi-frequency, centimeter-band total flux density and linear polarization monitoring observations to constrain radiative trans
Externí odkaz:
https://doaj.org/article/a387d40b88c643748443b27dcdf8083a
Autor:
Richards Joseph L., Hovatta Talvikki, Lister Matthew L., Readhead Anthony C. S., Max-Moerbeck Walter, Savolainen Tuomas, Angelakis Emmanouil, Fuhrmann Lars, Aller Margo F., Aller Hugh D., Myserlis Ioannis, Karamanavis Vassilis
Publikováno v:
EPJ Web of Conferences, Vol 61, p 04010 (2013)
In September 2012, the high-synchrotron-peaked (HSP) blazar Markarian 421 underwent a rapid wideband radio flare, reaching nearly twice the brightest level observed in the centimeter band in over three decades of monitoring. In response to this event
Externí odkaz:
https://doaj.org/article/88ace7d6ef5a42bd87eb3ef3ef849ee3
Publikováno v:
Galaxies, 2017, 5(4), 75
The University of Michigan 26-m paraboloid was dedicated to obtaining linear polarization and total flux density observations of blazars from the mid-1960s until June 2012 providing an unprecedented record tracking centimeter-band variability over de
Externí odkaz:
http://arxiv.org/abs/1711.05763
Autor:
Aller, Margo F., Hughes, Philip A., Aller, Hugh D., Hovatta, Talvikki, Ramakrishnan, Venkatessh
Since the mid-1980s the shock-in-jet model has been the preferred paradigm to explain radio-band flaring in blazar jets. We describe our radiative transfer model incorporating relativistically-propagating shocks, and illustrate how the 4.8, 8, and 14
Externí odkaz:
http://arxiv.org/abs/1609.06332
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