Zobrazeno 1 - 10
of 289
pro vyhledávání: '"D. Grupe"'
Publikováno v:
Universe, Vol 10, Iss 7, p 289 (2024)
The quasar 3C 286, a well-known calibrator source in radio astronomy, was found to exhibit exceptional multiwavelength properties. Its rich and complex optical emission-line spectrum revealed its narrow-line Seyfert 1 (NLS1) nature. Given its strong
Externí odkaz:
https://doaj.org/article/ba68645c964e42d6b9878892cc26c37c
Autor:
M. Z. Buhariwalla, L. C. Gallo, J. Mao, J. Jiang, L. K. Pothier-Bogoslowski, E. Järvelä, S. Komossa, D. Grupe
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 1, p 22 (2024)
Previous X-ray works on Mrk 1239 have revealed a complex narrow-line Seyfert 1 that exhibits substantial absorption and strong emission from both collisionally ionized and photoionized plasmas. Here, we report on deep-pointed observations with XMM-Ne
Externí odkaz:
https://doaj.org/article/d838137aaf8a4e98a6f0e47924f4c98e
Autor:
D. W. Xu, S. Komossa, D. Grupe, J. Wang, L. P. Xin, X. H. Han, J. Y. Wei, J. Y. Bai, E. Bon, F. Cangemi, B. Cordier, M. Dennefeld, L. C. Gallo, W. Kollatschny, De-Feng Kong, M. W. Ochmann, Y. L. Qiu, N. Schartel
Publikováno v:
Universe, Vol 10, Iss 2, p 61 (2024)
We discuss applications of the study of the new and barely explored class of changing-look (CL) narrow-line Seyfert 1 (NLS1) galaxies and comment on their detection with the space mission SVOM (Space Variable Objects Monitor). We highlight the case o
Externí odkaz:
https://doaj.org/article/5722199c256d4cd89ab22cca1196b00d
Autor:
S. Komossa, A. Kraus, D. Grupe, A. G. Gonzalez, M. A. Gurwell, L. C. Gallo, F. K. Liu, I. Myserlis, T. P. Krichbaum, S. Laine, U. Bach, J. L. Gómez, M. L. Parker, S. Yao, M. Berton
Publikováno v:
The Astrophysical Journal, Vol 944, Iss 2, p 177 (2023)
Based on our dedicated Swift monitoring program, MOMO, OJ 287 is one of the best-monitored blazars in the X-ray–UV–optical regime. Here, we report results from our accompanying, dense, multifrequency (1.4–44 GHz) radio monitoring of OJ 287 betw
Externí odkaz:
https://doaj.org/article/b1fb861dcbe04907baca8c4b2dc0c539
Autor:
S. Komossa, D. Grupe, A. Kraus, L. C. Gallo, A. G. Gonzalez, M. L. Parker, M. J. Valtonen, A. R. Hollett, U. Bach, J. L. Gómez, I. Myserlis, S. Ciprini
Publikováno v:
Universe, Vol 7, Iss 8, p 261 (2021)
Our project MOMO (Multiwavelength observations and modeling of OJ 287) consists of dedicated, dense, long-term flux and spectroscopic monitoring, and deep follow-up observations of the blazar OJ 287 at >13 frequencies from the radio to the X-ray band
Externí odkaz:
https://doaj.org/article/c4fa6296b4f54773986d281d611703b9
Publikováno v:
Lawther, D, Vestergaard, M, Raimundo, S, Koay, J Y, Peterson, B M, Fan, X, Grupe, D & Mathur, S 2023, ' Flares in the changing look AGN Mrk 590-I. The UV response to X-ray outbursts suggests a more complex reprocessing geometry than a standard disc ', Monthly Notices of the Royal Astronomical Society, vol. 519, no. 3, pp. 3903-3922 . https://doi.org/10.1093/mnras/stac3515
Mrk 590 is a known changing-look AGN which almost turned off in 2012, and then in 2017 partially re-ignited into a repeat flaring state, unusual for an AGN. Our \emph{Swift} observations since 2013 allow us to characterise the accretion-generated emi
Autor:
Velibor Velović, M D Filipović, L Barnes, R P Norris, C D Tremblay, G Heald, L Rudnick, S S Shabala, T G Pannuti, H Andernach, O Titov, S G H Waddell, B S Koribalski, D Grupe, T Jarrett, R Z E Alsaberi, E Carretti, J D Collier, S Einecke, T J Galvin, A Hotan, P Manojlović, J Marvil, K Nandra, T H Reiprich, G Rowell, M Salvato, M Whiting
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 516:1865-1880
We present the discovery of highly-collimated radio jets spanning a total of 355 kpc around the nearby elliptical galaxy NGC 2663, and the possible first detection of recollimation on kiloparsec scales. The small distance to the galaxy (~28.5 Mpc) al
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 515:5198-5210
AT2019pev is a nuclear transient in a narrow-line Seyfert 1 galaxy at $z=0.096$. The archival ultraviolet, optical and infrared data showed features of both tidal disruption events (TDEs) and active galactic nuclei (AGNs), and its nature is not fully
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Akademický článek
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