2001A&A...377..784N


Query : 2001A&A...377..784N

2001A&A...377..784N - Astronomy and Astrophysics, volume 377, 784-800 (2001/10-3)

Planetary nebulae as mass tracers of their parent galaxies: Biases in the estimate of the kinematical quantities.

NAPOLITANO N.R., ARNABOLDI M., FREEMAN K.C. and CAPACCIOLI M.

Abstract (from CDS):

Multi-object and multi-fiber spectrographs on 4 and 8 m telescopes make it possible to use extragalactic planetary nebulae (PNe) in the outer halos of early-type galaxies as kinematical tracers, where classical techniques based on integrated stellar light fail. Until now, published PNe radial velocity samples are small, with only a few tens of radial velocity measurements (except for a few cases like NGC 5128 or M 31), causing uncertainties in the mass and angular momentum estimates based on these data. To quantify these uncertainties, we have made equilibrium models for spherical galaxies, with and without dark matter, and via Montecarlo simulations we produce radial velocity samples with different sizes. We then apply, to these discrete radial velocity fields, the same standard kinematical analysis as it is commonly done with small samples of observed PNe radial velocities. By comparison of the inferred quantities with those computed from the analytical model, we test for systematic biases and establish a robust procedure to infer the angular momentum distribution and radial velocity dispersion profiles from such samples.

Abstract Copyright:

Journal keyword(s): techniques: radial velocities - galaxies: elliptical - galaxies: halos - galaxies: kinematics and dynamics - dark matter

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11371 1
2 NGC 1316 GiP 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1240 1
3 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1485 1
4 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6068 0
5 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6441 3
6 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4110 3

    Equat.    Gal    SGal    Ecl

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2021.07.27-08:37:12

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