Zobrazeno 1 - 10
of 294
pro vyhledávání: '"Zamaninasab, M."'
Autor:
Shahzamanian, B., Eckart, A., Valencia-S., M., Witzel, G., Zamaninasab, M., Sabha, N., García-Marín, M., Karas, V., Karssen, G. D., Borkar, A., Dovuciak, M., Kunneriath, D., Bursa, M., Buchholz, R., Moultaka, J., Straubmeier, C.
Publikováno v:
A&A 576, A20 (2015)
We present a statistical analysis of polarized near-infrared (NIR) light from Sgr A*, the radio source associated with the supermassive black hole at the center of the Milky Way. The observations have been carried out using the adaptive optics instru
Externí odkaz:
http://arxiv.org/abs/1411.0006
Autor:
Valencia-S., M., Zuther, J., Vitale, M., Eckart, A., Zamaninasab, M., Koeln, I Physikalisches Institut - Universitaet zu, Radioastronomie, Max-Planck Institut fuer
Observationally established correlations between black hole mass and host galaxy structural/dynamical properties (like the M_BH - sigma relation) give support to the idea of an intimate link between the growth of black holes (BHs) and their host gala
Externí odkaz:
http://arxiv.org/abs/1312.1281
Autor:
Eckart, Andreas, Horrobin, M., Britzen, S., Zamaninasab, M., Muzic, K., Sabha, N., Shahzamanian, B., Yazici, S., Moser, L., Garcia-Mari, M., Valencia-S., M., Borkar, A., Bursa, M., Karssen, G., Karas, V., Zajacek, M., Bronfman, L., Finger, R., Jalali, B., Vitale, M., Rauch, C., Kunneriath, D., Moultaka, J., Straubmeier, C., Rashed, Y. E., Markakis, K., Zensus, A.
A fast moving infrared excess source (G2) which is widely interpreted as a core-less gas and dust cloud approaches Sagittarius A* (SgrA*) on a presumably elliptical orbit. VLT K_s-band and Keck K'-band data result in clear continuum identifications a
Externí odkaz:
http://arxiv.org/abs/1311.2753
Autor:
Eckart, Andreas, Britzen, S., Horrobin, M., Zamaninasab, M., Muzic, K., Sabha, N., Shahzamanian, B., Yazici, S., Moser, L., Zuther, J., Garcia-Marin, M., Valencia-S., M., Bursa, M., Karssen, G., Karas, V., Jalali, B., Vitale, M., Bremer, M., Fischer, S., Smajic, S., Rauch, C., Kunneriath, D., Moultaka, J., Straubmeier, C., Rashed, Y. E., Iserlohe, C., Busch, G., Markakis, K., Borkar, A., Zensus, A.
The super-massive 4 million solar mass black hole (SMBH) SgrA* shows flare emission from the millimeter to the X-ray domain. The nucleus of the Milky Way has properties (stellar cluster, young stars, molecular gas and an accreting SMBH) that resemble
Externí odkaz:
http://arxiv.org/abs/1311.2743
Autor:
Witzel, G., Eckart, A., Bremer, M., Zamaninasab, M., Shahzamanian, B., Valencia-S., M., Schödel, R., Karas, V., Lenzen, R., Marchili, N., Sabha, N., Garcia-Marin, M., Buchholz, R. M., Kunneriath, D., Straubmeier, C.
We present a comprehensive data description for Ks-band measurements of Sgr A*. We characterize the statistical properties of the variability of Sgr A* in the near-infrared, which we find to be consistent with a single-state process forming a power-l
Externí odkaz:
http://arxiv.org/abs/1208.5836
Autor:
Eckart, A., Garcia-Marin, M., Vogel, S. N., Teuben, P., Morris, M. R., Baganoff, F., Dexter, J., Schoedel, R., Witzel, G., Valencia-S., M., Karas, V., Kunneriath, D., Bremer, M., Straubmeier, C., Moser, L., Sabha, N., Buchholz, R., Zamaninasab, M., Muzic, K., Moultaka, J., Zensus, J. A.
Based on Bremer et al. (2011) and Eckart et al. (2012) we report on simultaneous observations and modeling of the millimeter, near-infrared, and X-ray flare emission of the source Sagittarius A* (SgrA*) associated with the super-massive black hole at
Externí odkaz:
http://arxiv.org/abs/1208.1135
Autor:
Zamaninasab, M., Eckart, A., Dovciak, M., Karas, V., Schoedel, R., Witzel, G., Sabha, N., Garcia-Marin, M., Kunneriath, D., Muzic, K., Straubmeier, C., Valencia-S, M., Zensus, J. A.
Several massive black holes exhibit flux variability on time scales that correspond to source sizes of the order of few Schwarzschild radii. We survey the potential of near-infrared and X-ray polarimetry to constrain physical properties of such black
Externí odkaz:
http://arxiv.org/abs/1102.0775
Autor:
Witzel, G., Eckart, A., Buchholz, R. M., Zamaninasab, M., Lenzen, R., Schödel, R., Araujo, C., Sabha, N., Bremer, M., Karas, V., Straubmeier, C., Muzic, K.
We report on the results of calibrating and simulating the instrumental polarization properties of the ESO VLT adaptive optics camera system NAOS/CONICA (NACO) in the Ks-band. We use the Stokes/Mueller formalism for metallic reflections to describe t
Externí odkaz:
http://arxiv.org/abs/1010.4708
Autor:
Kunneriath, D., Witzel, G., Eckart, A., Zamaninasab, M., übel, R. Gieß, Schödel, R., Baganoff, F. K., Morris, M. R., Dovčiak, M., Duschl, W. J., García-Marín, M., Karas, V., König, S., Krichbaum, T. P., Krips, M., Lu, R. -S., Mauerhan, J., Moultaka, J., Mužić, K., Sabha, N., Najarro, F., Pott, J. -U., Schuster, K. F., Sjouwerman, L. O., Straubmeier, C., Thum, C., Vogel, S. N., Teuben, P., Weiss, A., Wiesemeyer, H., Zensus, J. A.
Publikováno v:
Astronomy and Astrophysics, Volume 517, id.A46, 2010
We report on a successful, simultaneous observation and modelling of the millimeter (mm) to near-infrared (NIR) flare emission of the Sgr A* counterpart associated with the supermassive black hole at the Galactic centre (GC). We present a mm/sub-mm l
Externí odkaz:
http://arxiv.org/abs/1008.1560
In 2007 we reported two cometary shaped sources in the vicinity of Sgr A* (0.8" and 3.4" projected distance), named X7 and X3. The symmetry axes of the two sources are aligned to within 5 degrees in the plane of the sky and the tips of their bow-shoc
Externí odkaz:
http://arxiv.org/abs/1006.0909