2010A&A...518A..44M


Query : 2010A&A...518A..44M

2010A&A...518A..44M - Astronomy and Astrophysics, volume 518, A44-44 (2010/7-2)

Counter-dispersed slitless-spectroscopy technique: planetary nebula velocities in the halo of NGC 1399.

McNEIL E.K., ARNABOLDI M., FREEMAN K.C., GERHARD O.E., COCCATO L. and DAS P.

Abstract (from CDS):

Using a counter-dispersed slitless spectroscopy technique, we detect and measure the line-of-sight velocities of 187 planetary nebulae (PNe) around one of the nearest cD galaxies, NGC 1399, with FORS1 on the VLT. We describe the method for identifying and classifying the emission-line sources and the procedure for computing their J2000 coordinates and velocities. The number of PN detections and the errors in the velocity measurements (37km/s) indicate that this technique is comparable to other methods. We present the spatial distribution of the PNe and a basic analysis of their velocities. The PN two-dimensional velocity field shows marginal rotation consistent with other studies. We also find a low-velocity substructure in the halo and a flatter velocity-dispersion profile compared to previous observations that extends to ∼400''. The detection of a low-velocity subcomponent underscores the importance of discrete velocity tracers for the detection of un-mixed components. The new velocity-dispersion profile is in good agreement with revised velocity dispersions for the red globular clusters in NGC 1399. The outer parts of this profile are consistent with one of the dynamical models, which corresponds to a circular velocity of ≃340km/s and a rescaled B-band mass-to-light ratio of ≃20 at 7' radius. These measurements trace the kinematics of the outer halo and disentangle the heterogenous populations in the Fornax Cluster core. The new data set the stage for a revised dynamical model of the outer halo of NGC 1399.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: NGC 1399 - galaxies: elliptical and lenticular, cD - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/A+A/518/A44): Data will be published in a companion paper>

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12097 1
2 NGC 1340 GiG 03 28 19.6251763296 -31 04 05.435465520   11.20 10.32 9.70   ~ 206 1
3 NGC 1396 GiG 03 38 06.5677454520 -35 26 23.637846372   14.80       ~ 89 1
4 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1530 1
5 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1725 0
6 NGC 1404 GiP 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 725 1
7 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6379 0
8 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 6826 3

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2023.01.31-01:10:08

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