Zobrazeno 1 - 10
of 82
pro vyhledávání: '"Zetzl, M."'
Autor:
Kollatschny, W., Ochmann, M. W., Zetzl, M., Haas, M., Chelouche, D., Kaspi, S., Nunez, F. Pozo, Grupe, D.
Publikováno v:
A&A 619, A168 (2018)
A strong X-ray outburst was detected in HE1136-2304 in 2014. Accompanying optical spectra revealed that the spectral type has changed from a nearly Seyfert 2 type (1.95), classified by spectra taken 10 and 20 years ago, to a Seyfert 1.5 in our most r
Externí odkaz:
http://arxiv.org/abs/1808.07331
Autor:
Zetzl, M., Kollatschny, W., Ochmann, M. W., Grupe, D., Haas, M., Ramolla, M., Chelouche, D., Kaspi, S., Schartel, N.
Publikováno v:
A&A 618, A83 (2018)
A strong outburst in the X-ray continuum and a change of its Seyfert spectral type was detected in HE 1136-2304 in 2014. The spectral type changed from nearly Seyfert 2 type (1.95) to Seyfert 1.5 type in comparison to previous observations taken ten
Externí odkaz:
http://arxiv.org/abs/1804.05911
Autor:
Parker, M. L., Komossa, S., Kollatschny, W., Walton, D. J., Schartel, N., Santos-Lleo, M., Harrison, F. A., Fabian, A. C., Zetzl, M., Grupe, D., Rodriguez-Pascual, P. M., Vasudevan, R. V.
We report the detection of high-amplitude X-ray flaring of the AGN HE 1136-2304, which is accompanied by a strong increase in the flux of the broad Balmer lines, changing its Seyfert type from almost type 2 in 1993 down to 1.5 in 2014. HE 1136-2304 w
Externí odkaz:
http://arxiv.org/abs/1606.04955
Autor:
Kollatschny, W., Schartel, N., Zetzl, M., Santos-Lleó, M., Rodríguez-Pascual, P. M., Ballo, L., Talavera, A.
Publikováno v:
A&A 585, A18 (2016)
The object PG 0043+039 has been identified as a broad absorption line (BAL) quasar based on its UV spectra. However, this optical luminous quasar has not been detected before in deep X-ray observations, making it the most extreme X-ray weak quasar kn
Externí odkaz:
http://arxiv.org/abs/1510.02681
Autor:
Kollatschny, W., Schartel, N., Zetzl, M., Santos-Lleo, M., Rodriguez-Pascual, P. M., Ballo, L.
The optical luminous quasar PG0043+039 has not been detected before in deep X-ray observations indicating the most extreme optical-to-X-ray slope index ${\alpha}_{ox}$ of all quasars. This study aims to detect PG0043+039 in a deep X-ray exposure. Fur
Externí odkaz:
http://arxiv.org/abs/1504.04271
Autor:
Nuñez, F. Pozo, Ramolla, M., Westhues, C., Haas, M., Chini, R., Steenbrugge, K., Domínguez, A. Barr, Kaderhandt, L., Hackstein, M., Kollatschny, W., Zetzl, M., Hodapp, Klaus W., Murphy, M.
Publikováno v:
A&A 576, A73 (2015)
We present the results of a three years monitoring campaigns of the $z = 0.024$ type-1 active galactic nucleus (AGN) PGC50427. Through the use of Photometric Reverberation Mapping with broad and narrow band filters, we determine the size of the broad
Externí odkaz:
http://arxiv.org/abs/1502.06771
Broad emission lines originate in the surroundings of supermassive black holes in the centers of active galactic nuclei (AGN). One method to investigate the extent, structure, and kinematics of the BLR is to study the continuum and line profile varia
Externí odkaz:
http://arxiv.org/abs/1405.1588
Autor:
Kollatschny, W., Zetzl, M.
Broad emission lines are emitted in the surroundings of supermassive black holes in the centers of active galactic nuclei (AGN). This region is spatially not resolved. We intend to get information on the structure and geometry of this broad emitting
Externí odkaz:
http://arxiv.org/abs/1308.1902
Autor:
Kollatschny, W., Zetzl, M.
Supermassive black holes in the centers of active galactic nuclei (AGN) are surrounded by broad-line regions (BLRs). The broad emission lines seen in the AGN spectra are emitted in this spatially unresolved region. We intend to obtain information on
Externí odkaz:
http://arxiv.org/abs/1301.7704
Autor:
Kollatschny, W., Zetzl, M.
We present a study of the broad optical/UV emission line profiles in AGN (active galactic nuclei) to get information on the dominant velocity components (turbulence, rotation, etc.) in the central broad-line region (BLR). We introduce line broadening
Externí odkaz:
http://arxiv.org/abs/1211.3065