Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Siopis, Christos"'
Autor:
Merle, Thibault, Pourbaix, Dimitri, Jorissen, Alain, Siopis, Christos, Van Eck, Sophie, Van Winckel, Hans
The Gaia mission is delivering a large number of astrometric orbits for binary stars. By combining these with spectroscopic orbits for systems with two observable spectra (SB2), it is possible to derive the masses of both components. However, to get
Externí odkaz:
http://arxiv.org/abs/2312.09151
We obtained Spitzer/IRAC 3.6-8 micron images of the nearby spiral galaxy NGC 4258 to study possible interactions between dust and the radio jet. In our analysis we also included high-resolution radio continuum, H-alpha, CO, and X-ray data. Our data r
Externí odkaz:
http://arxiv.org/abs/1008.3586
Autor:
Gultekin, Kayhan, Richstone, Douglas O., Gebhardt, Karl, Lauer, Tod R., Tremaine, Scott, Aller, M. C., Bender, Ralf, Dressler, Alan, Faber, S. M., Filippenko, Alexei V., Green, Richard, Ho, Luis C., Kormendy, John, Magorrian, John, Pinkney, Jason, Siopis, Christos
Publikováno v:
Astrophys.J.698:198-221,2009
We derive improved versions of the relations between supermassive black hole mass (M_BH) and host-galaxy bulge velocity dispersion (sigma) and luminosity (L) (the M-sigma and M-L relations), based on 49 M_BH measurements and 19 upper limits. Particul
Externí odkaz:
http://arxiv.org/abs/0903.4897
Autor:
Gultekin, Kayhan, Richstone, Douglas O., Gebhardt, Karl, Lauer, Tod R., Pinkney, Jason, Aller, M. C., Bender, Ralf, Dressler, Alan, Faber, S. M., Filippenko, Alexei V., Green, Richard, Ho, Luis C., Kormendy, John, Siopis, Christos
Publikováno v:
Astrophys.J.695:1577-1590,2009
We report five new measurements of central black hole masses based on STIS and WFPC2 observations with the Hubble Space Telescope and on axisymmetric, three-integral, Schwarzschild orbit-library kinematic models. We selected a sample of galaxies with
Externí odkaz:
http://arxiv.org/abs/0901.4162
Autor:
Siopis, Christos, Gebhardt, Karl, Lauer, Tod R., Kormendy, John, Pinkney, Jason, Richstone, Douglas, Faber, S. M., Tremaine, Scott, Aller, M. C., Bender, Ralf, Bower, Gary, Dressler, Alan, Filippenko, Alexei V., Green, Richard, Ho, Luis C., Magorrian, John
Publikováno v:
Astrophys.J.693:946-969,2009
We determine the mass of the black hole at the center of the spiral galaxy NGC 4258 by constructing axisymmetric dynamical models of the galaxy. These models are constrained by high spatial resolution imaging and long-slit spectroscopy of the nuclear
Externí odkaz:
http://arxiv.org/abs/0808.4001
Autor:
Gebhardt, Karl, Lauer, Tod R., Pinkney, Jason, Bender, Ralf, Richstone, Douglas, Aller, Monique, Bower, Gary, Dressler, Alan, Faber, Sandra, Filippenko, Alexei, Green, Richard, Ho, Luis, Kormendy, John, Siopis, Christos, Tremaine, Scott
The largest galaxies, and in particular central galaxies in clusters, offer unique insight into understanding the mechanism for the growth of nuclear black holes. We present Hubble Space Telescope kinematics for NGC1399, the central galaxy in Fornax.
Externí odkaz:
http://arxiv.org/abs/0709.0585
Autor:
Lauer, Tod R., Faber, S. M., Gebhardt, Karl, Richstone, Douglas, Tremaine, Scott, Ajhar, Edward A., Aller, M. C., Bender, Ralf, Dressler, Alan, Filippenko, Alexei V., Green, Richard, Grillmair, Carl J., Ho, Luis C., Kormendy, John, Magorrian, John, Pinkney, Jason, Siopis, Christos
We analyze HST+WFPC2 images of 77 early-type galaxies. Brightness profiles are classed into "core" or "power-law" forms. Cores are typically rounder than power-law galaxies. Nearly all power-laws with central ellipticity >=0.3 have stellar disks, imp
Externí odkaz:
http://arxiv.org/abs/astro-ph/0412040
Autor:
Richstone, Douglas, Gebhardt, Karl, Aller, Monique, Bender, Ralf, Bower, Gary, Dressler, Alan, Faber, S. M., Filippenko, Alexei V., Green, Richard, Ho, Luis C., Kormendy, John, Lauer, Tod R., Magorrian, John, Pinkney, Jason, Siopis, Christos, Tremaine, Scott
We show that orbit-superposition dynamical models (Schwarzschild's method) provide reliable estimates of nuclear black hole masses and errors when constructed from adequate orbit libraries and kinematic data. We thus rebut two recent papers that argu
Externí odkaz:
http://arxiv.org/abs/astro-ph/0403257
Autor:
Kandrup, Henry E., Siopis, Christos
Publikováno v:
Mon.Not.Roy.Astron.Soc. 345 (2003) 727
This paper investigates chaos and chaotic phase mixing in triaxial Dehnen potentials which have been proposed to describe realistic ellipticals. Earlier work is extended by exploring the effects of (1) variable axis ratios, (2) `graininess' associate
Externí odkaz:
http://arxiv.org/abs/astro-ph/0305198
Autor:
Siopis, Christos, Kandrup, Henry E.
Cuspy triaxial potentials admit a large number of chaotic orbits, which moreover exhibit extreme "stickiness" that makes the process of chaotic mixing surprisingly inefficient. Environmental effects, modeled as noise and/or periodic driving, help acc
Externí odkaz:
http://arxiv.org/abs/astro-ph/0202188