Zobrazeno 1 - 10
of 173
pro vyhledávání: '"Douglas, N. G."'
Autor:
Cortesi, A., Merrifield, M. R., Coccato, L., Arnaboldi, M., Gerhard, O., Bamford, S., Napolitano, N. R., Romanowsky, A. J., Douglas, N. G., Kuijken, K., Capaccioli, M., Freeman, K. C., Saha, K., Chies-Santos, A. L.
The stellar kinematics of the spheroids and discs of S0 galaxies contain clues to their formation histories. Unfortunately, it is difficult to disentangle the two components and to recover their stellar kinematics in the faint outer parts of the gala
Externí odkaz:
http://arxiv.org/abs/1304.1382
Autor:
Cortesi, A., Arnaboldi, M., Coccato, L., Merrifield, M. R., Gerhard, O., Bamford, S., Romanowsky, A. J., Napolitano, N. R., Douglas, N. G., Kuijken, K., Capaccioli, M., Freeman, K. C., Chies-Santos, A. L., Pota, V.
Publikováno v:
A&A 549, A115 (2013)
The origins of S0 galaxies remain obscure, with various mechanisms proposed for their formation, likely depending on environment. These mechanisms would imprint different signatures in the galaxies' stellar kinematics out to large radii, offering a m
Externí odkaz:
http://arxiv.org/abs/1303.5361
Autor:
Cortesi, A., Merrifield, M. R., Arnaboldi, M., Gerhard, O., Martinez-Valpuesta, I., Saha, K., Coccato, L., Bamford, S., Napolitano, N. R., Das, P., Douglas, N. G., Romanowsky, A. J., Kuijken, K., Capaccioli, M., Freeman, K. C.
To investigate the origins of S0 galaxies, we present a new method of analyzing their stellar kinematics from discrete tracers such as planetary nebulae. This method involves binning the data in the radial direction so as to extract the most general
Externí odkaz:
http://arxiv.org/abs/1101.5092
Autor:
Napolitano, N. R., Romanowsky, A. J., Capaccioli, M., Douglas, N. G., Arnaboldi, M., Coccato, L., Gerhard, O., Kuijken, K., Merrifield, M. R., Bamford, S. P., Cortesi, A., Das, P., Freeman, K. C.
As part of our current programme to test LCDM predictions for dark matter (DM) haloes using extended kinematical observations of early-type galaxies, we present a dynamical analysis of the bright elliptical galaxy NGC 4374 (M84) based on ~450 Planeta
Externí odkaz:
http://arxiv.org/abs/1010.1533
Autor:
Coccato, L., Gerhard, O., Arnaboldi, M., Das, P., Douglas, N. G., Kuijken, K., Merrifield, M. R., Napolitano, N. R., Noordermeer, E., Romanowsky, A. J., Capaccioli, M., Cortesi, A., De Lorenzi, F., Freeman, K. C.
We present new planetary nebulae (PNe) positions, radial velocities, and magnitudes for 6 early-type galaxies obtained with the Planetary Nebulae Spectrograph, their two-dimensional velocity and velocity dispersion fields. We extend this study to inc
Externí odkaz:
http://arxiv.org/abs/0811.3203
Autor:
Coccato, L., Gerhard, O., Arnaboldi, M., Das, P., Douglas, N. G., Kuijken, K., Merrifield, M. R., Napolitano, N. R., Noordermeer, E., Romanowsky, A. J., Capaccioli, M., Cortesi, A., De Lorenzi, F., Freeman, K. C.
We present first results of a study of the halo kinematics for a sample of early type galaxies using planetary nebulae (PNe) as kinematical tracers. PNe allow to extend up to several effective radii (Re) the information from absorption line kinematic
Externí odkaz:
http://arxiv.org/abs/0811.2332
Autor:
Napolitano, N. R., Romanowsky, A. J., Coccato, L., Capaccioli, M., Douglas, N. G., Noordermeer, E., Gerhard, O., Arnaboldi, M., De Lorenzi, F., Kuijken, K., Merrifield, M. R., O'Sullivan, E., Cortesi, A., Das, P., Freeman, K. C.
Publikováno v:
(2009) MNRAS, 393, 329
We present new Planetary Nebula Spectrograph observations of the ordinary elliptical galaxy NGC 4494, resulting in positions and velocities of 255 PNe out to 7 effective radii (25 kpc). We also present new wide-field surface photometry from MMT/Megac
Externí odkaz:
http://arxiv.org/abs/0810.1291
Autor:
De Lorenzi, F., Gerhard, O., Coccato, L., Arnaboldi, M., Capaccioli, M., Douglas, N. G., Freeman, K. C., Kuijken, K., Merrifield, M. R., Napolitano, N. R., Noordermeer, E., Romanowsky, A. J., Debattista, V. P.
Recent results from the Planetary Nebula Spectrograph (PN.S) survey have revealed a rapidly falling velocity dispersion profile in the nearby elliptical galaxy NGC 3379, casting doubts on whether this intermediate-luminosity galaxy has the kind of da
Externí odkaz:
http://arxiv.org/abs/0804.3350
Autor:
Noordermeer, E., Merrifield, M. R., Coccato, L., Arnaboldi, M., Capaccioli, M., Douglas, N. G., Freeman, K. C., Gerhard, O., Kuijken, K., De Lorenzi, F., Napolitano, N. R., Romanowsky, A. J.
We investigate the manner in which lenticular galaxies are formed by studying their stellar kinematics: an S0 formed from a fading spiral galaxy should display similar cold outer disc kinematics to its progenitor, while an S0 formed in a minor merger
Externí odkaz:
http://arxiv.org/abs/0712.0859
Autor:
Napolitano, N. R., Romanowsky, A. J., Coccato, L., Capaccioli, M., Douglas, N. G., Noordermeer, E., Merrifield, M. R., Kuijken, K., Arnaboldi, M., Gerhard, O., Freeman, K. C., De Lorenzi, F., Das, P.
We examine the dark matter properties of nearby early-type galaxies using planetary nebulae (PNe) as mass probes. We have designed a specialised instrument, the Planetary Nebula Spectrograph (PN.S) operating at the William Herschel telescope, with th
Externí odkaz:
http://arxiv.org/abs/0709.1636