Zobrazeno 1 - 10
of 854
pro vyhledávání: '"Bartko, H"'
(Abridged) The Galactic Center (GC) hosts a population of young stars some of which seem to form mutually inclined discs of clockwise and counter clockwise rotating stars. We present a warped disc origin scenario for these stars assuming that an init
Externí odkaz:
http://arxiv.org/abs/1210.4750
Autor:
Dodds-Eden, K., Gillessen, S., Fritz, T. K., Eisenhauer, F., Trippe, S., Genzel, R., Ott, T., Bartko, H., Pfuhl, O., Bower, G., Goldwurm, A., Porquet, D., Trap, G., Yusef-Zadeh, F.
In this paper we examine properties of the variable source Sgr A* in the near-infrared (NIR) using a very extensive Ks-band data set from NACO/VLT observations taken 2004 to 2009. We investigate the variability of Sgr A* with two different photometri
Externí odkaz:
http://arxiv.org/abs/1008.1984
Autor:
Bartko, H., Gillessen, S., Rabien, S., Thiel, M., Gräter, A., Haug, M., Kellner, S., Eisenhauer, F., Lacour, S., Straubmeier, C., Berger, J. -P., Jocou, L., Chibani, W., Lüst, S., Moch, D., Pfuhl, O., Fabian, W., Araujo-Hauck, C., Perraut, K., Brandner, W., Perrin, G., Amorim, A.
Interferometric measurements of optical path length differences of stars over large baselines can deliver extremely accurate astrometric data. The interferometer GRAVITY will simultaneously measure two objects in the field of view of the Very Large T
Externí odkaz:
http://arxiv.org/abs/1007.1765
Autor:
Gillessen, S., Eisenhauer, F., Perrin, G., Brandner, W., Straubmeier, C., Perraut, K., Amorim, A., Schöller, M., Araujo-Hauck, C., Bartko, H., Baumeister, H., Berger, J. -P., Carvas, P., Cassaing, F., Chapron, F., Choquet, E., Clenet, Y., Collin, C., Eckart, A., Fedou, P., Fischer, S., Gendron, E., Genzel, R., Gitton, P., Gonte, F., Gräter, A., Haguenauer, P., Haug, M., Haubois, X., Henning, T., Hippler, S., Hofmann, R., Jocou, L., Kellner, S., Kervella, P., Klein, R., Kudryavtseva, N., Lacour, S., Lapeyrere, V., Laun, W., Lena, P., Lenzen, R., Lima, J., Moch, D., Moratschke, D., Moulin, T., Naranjo, V., Neumann, U., Nolot, A., Paumard, T., Pfuhl, O., Rabien, S., Ramos, J., Rees, J. M., Rohloff, R. -R., Rouan, D., Rousset, G., Sevin, A., Thiel, M., Wagner, K., Wiest, M., Yazici, S., Ziegler, D.
GRAVITY is an adaptive optics assisted Beam Combiner for the second generation VLTI instrumentation. The instrument will provide high-precision narrow-angle astrometry and phase-referenced interferometric imaging in the astronomical K-band for faint
Externí odkaz:
http://arxiv.org/abs/1007.1612
Autor:
Dodds-Eden, K., Porquet, D., Trap, G., Quataert, E., Gillessen, S., Grosso, N., Genzel, R., Goldwurm, A., Yusef-Zadeh, F., Trippe, S., Bartko, H., Eisenhauer, F., Ott, T., Fritz, T. K., Pfuhl, O.
We summarize recent observations and modeling of the brightest Sgr A* flare to be observed simultaneously in (near)-infrared and X-rays to date. Trying to explain the spectral characteristics of this flare through inverse Compton mechanisms implies p
Externí odkaz:
http://arxiv.org/abs/1002.2885
Autor:
Gillessen, S., Eisenhauer, F., Bartko, H., Dodds-Eden, K., Fritz, T. K., Pfuhl, O., Ott, T., Genzel, R.
The center of the Milky Way hosts a massive black hole. The observational evidence for its existence is overwhelming. The compact radio source Sgr A* has been associated with a black hole since its discovery. In the last decade, high-resolution, near
Externí odkaz:
http://arxiv.org/abs/1002.1224
Autor:
Bartko, H.
We summarize our latest observations of the nuclear star cluster in the central parsec of the Galaxy with the adaptive optics assisted, integral field spectrograph SINFONI on the ESO/VLT, which result in a total sample of 177 bona fide early-type sta
Externí odkaz:
http://arxiv.org/abs/1001.4232
Autor:
Gillessen, S., Eisenhauer, F., Fritz, T. K., Bartko, H., Dodds-Eden, K., Pfuhl, O., Ott, T., Genzel, R.
Publikováno v:
Astrophys.J.707:L114-L117,2009
Two recent papers (Ghez et al. 2008, Gillessen et al. 2009) have estimated the mass of and the distance to the massive black hole in the center of the Milky Way using stellar orbits. The two astrometric data sets are independent and yielded consisten
Externí odkaz:
http://arxiv.org/abs/0910.3069
Autor:
Bartko, H., Martins, F., Trippe, S., Fritz, T. K., Genzel, R., Ott, T., Eisenhauer, F., Gillessen, S., Paumard, T., Alexander, T., Dodds-Eden, K., Gerhard, O., Levin, Y., Mascetti, L., Nayakshin, S., Perets, H. B., Perrin, G., Pfuhl, O., Reid, M. J., Rouan, D., Zilka, M., Sternberg, A.
We present new observations of the nuclear star cluster in the central parsec of the Galaxy with the adaptive optics assisted, integral field spectrograph SINFONI on the ESO/VLT. Our work allows the spectroscopic detection of early and late type star
Externí odkaz:
http://arxiv.org/abs/0908.2177
Autor:
Dodds-Eden, K., Porquet, D., Trap, G., Quataert, E., Haubois, X., Gillessen, S., Grosso, N., Pantin, E., Falcke, H., Rouan, D., Genzel, R., Hasinger, G., Goldwurm, A., Yusef-Zadeh, F., Clenet, Y., Trippe, S., Lagage, P. -O., Bartko, H., Eisenhauer, F., Ott, T., Paumard, T., Perrin, G., Yuan, F., Fritz, T. K., Mascetti, L.
Publikováno v:
Astrophys.J.698:676-692,2009
This paper reports measurements of Sgr A* made with NACO in L' -band (3.80 um), Ks-band (2.12 um) and H-band (1.66 um) and with VISIR in N-band (11.88 um) at the ESO VLT, as well as with XMM-Newton at X-ray (2-10 keV) wavelengths. On 4 April, 2007, a
Externí odkaz:
http://arxiv.org/abs/0903.3416