Zobrazeno 1 - 10
of 1 568
pro vyhledávání: '"Jalali, B."'
Autor:
Borkar, A., Eckart, A., Straubmeier, C., Kunneriath, D., Jalali, B., Sabha, N., Shahzamanian, B., García-Marín, M., Valencia-S, M., Sjouwerman, L., Britzen, S., Karas, V., Dovčiak, M., Donea, A., Zensus, A.
Publikováno v:
Monthly Notices of the Royal Astronomical Society, (2016), Volume 458, Issue 3, p.2336-2349
The supermassive black hole, Sagittarius A* (Sgr A*), at the centre of the Milky Way undergoes regular flaring activity which is thought to arise from the innermost region of the accretion flow. We performed the monitoring observations of the Galacti
Externí odkaz:
http://arxiv.org/abs/1605.00424
We present a microscope paradigm that performs differential interference imaging with high sensitivity via optical amplification and radio-frequency (RF) heterodyne detection. This method, termed differentially-enhanced sideband imaging via radio-fre
Externí odkaz:
http://arxiv.org/abs/1503.07247
Autor:
Eckart, A., Valencia-S., M., Shahzamanian, B., Garcia-Marin, M., Peissker, F., Zajacek, M., Parsa, M., Jalali, B., Saalfeld, R., Sabha, N., Yazic, S., Karssen, G. D., Borkar, A., Markakis, K., Zensus, J. A., Straubmeier, C.
We summarize basic observational results on Sagittarius~A* obtained from the radio, infrared and X-ray domain. Infrared observations have revealed that a dusty S-cluster object (DSO/G2) passes by SgrA*, the central super-massive black hole of the Mil
Externí odkaz:
http://arxiv.org/abs/1501.02164
Autor:
Valencia-S., M., Eckart, A., Zajacek, M., Peissker, F., Parsa, M., Grosso, N., Mossoux, E., Porquet, D., Jalali, B., Karas, V., Yazici, S., Shahzamanian, B., Sabha, N., Saalfeld, R., Smajic, S., Grellmann, R., Moser, L., Horrobin, M., Borkar, A., Marin, M. Garcia, Dovciak, M., Kunneriath, D., Karssen, G. D., Bursa, M., Straubmeier, C., Bushouse, H.
We analyse and report in detail new near-infrared (1.45 - 2.45 microns) observations of the Dusty S-cluster Object (DSO/G2) during its approach to the black hole at the center of the Galaxy that were carried out with ESO VLT/SINFONI between February
Externí odkaz:
http://arxiv.org/abs/1410.8731
Autor:
Jalali, B., Pelupessy, F. I., Eckart, A., Zwart, S. Portegies, Sabha, N., Borkar, A., Moultaka, J., Mužić, K., Moser, L.
It is often assumed that the strong gravitational field of a super-massive black hole disrupts an adjacent molecular cloud preventing classical star formation in the deep potential well of the black hole. Yet, young stars have been observed across th
Externí odkaz:
http://arxiv.org/abs/1408.0005
Autor:
Jalali, B., Pelupessy, I., Eckart, A., Zwart, S. Portegies, Sabha, N., Borkar, A., Moultaka, J., Muzic, K., Moser, L.
We aim at modelling small groups of young stars such as IRS 13N, 0.1 pc away from Sgr A*, which is suggested to contain a few embedded massive young stellar objects. We perform hydrodynamical simulations to follow the evolution of molecular clumps or
Externí odkaz:
http://arxiv.org/abs/1311.4881
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:
Feldmeier, A., Lützgendorf, N., Neumayer, N., Kissler-Patig, M., Gebhardt, K., Baumgardt, H., Noyola, E., de Zeeuw, P. T., Jalali, B.
Intermediate-mass black holes (IMBHs, 10^2-10^5 M_sun) fill the gap between stellar-mass black holes and supermassive black holes (SMBHs). Simulations have shown that IMBHs may form in dense star clusters, and therefore may still be present in these
Externí odkaz:
http://arxiv.org/abs/1304.4176
Autor:
Eckart, A., Muzic, K., Yazici, S., Shahzamanian, B., Witzel, G., Sabha, N., Moser, L., Garcia-Marin, M., Valencia-S., M., Jalali, B., Bremer, M., Straubmeier, C., Kunneriath, D., Moultaka, J.
There are a number of faint compact infrared excess sources in the central stellar cluster of the Milky Way. Their nature and origin is unclear. In addition to several isolated objects of this kind we find a small but dense cluster of co-moving sourc
Externí odkaz:
http://arxiv.org/abs/1208.1907