2020A&A...641A.143S


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.28CET20:58:55

2020A&A...641A.143S - Astronomy and Astrophysics, volume 641A, 143-143 (2020/9-1)

A robust two-parameter description of the stellar profile of elliptical galaxies.

SONNENFELD A.

Abstract (from CDS):


Context. The stellar density profile of a galaxy is typically summarised with two numbers: the total stellar mass and half-light radius. The total mass of a galaxy, however, is not a well-defined quantity, due to the finite depth of photometric observations and the arbitrariness of the distinction between galaxy and diffuse intra-group light. This limits our ability to make accurate comparisons between models and observations.
Aims. I wish to provide a more robust two-parameter description of the stellar density distribution of elliptical galaxies, in terms of quantities that can be measured unambiguously.
Methods. I propose using the stellar mass enclosed within 10 kpc in projection, M*,10, and the mass-weighted stellar density slope within the same aperture, Γ*,10, for this purpose. I measured the distribution in M*,10 and Γ*,10 of a sample of elliptical galaxies from the Sloan Digital Sky Survey and the Galaxy And Mass Assembly survey, using photometry from the Hyper Suprime-Cam survey. I measured, at fixed (M*,10, Γ*,10), what the spread is in the galaxy surface brightness profile and central stellar velocity dispersion within the sample. As a first application, I then compared the observed M*,10*,10 relation of elliptical galaxies with that of similarly selected galaxies in the EAGLE REFERENCE simulation.
Results. The pair of values of (M*,10, Γ*,10) can be used to predict the stellar density profile in the inner 10 kpc of a galaxy with better than 20% accuracy. Similarly, M*,10 and Γ*,10 can be combined to obtain a proxy for stellar velocity dispersion that is at least as good as the stellar mass fundamental plane. The average stellar density slope of EAGLE elliptical galaxies matches that of observed ones at M*,10=1011 M well, but the EAGLE M*,10*,10 relation is shallower and has a larger intrinsic scatter compared to observations .
Conclusions. This new parameterisation of the stellar density profile of massive elliptical galaxies provides a more robust way of comparing results from different photometric surveys and from hydrodynamical simulations, with respect to a description based on total stellar mass and half-light radius.

Abstract Copyright: © ESO 2020

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters - galaxies: structure

Simbad objects: 21

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Number of rows : 21

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 SDSS J055815.36+020120.8 ? 05 58 15.36768 +02 01 20.8740           ~ 1 0
2 SDSS J084142.36+002838.1 BiC 08 41 42.366 +00 28 38.18           ~ 3 0
3 SDSS J085816.54+020118.8 G 08 58 16.5448953389 +02 01 18.840854937           ~ 3 0
4 SDSS J090213.88+012659.3 G 09 02 13.8791303082 +01 26 59.334034714           ~ 3 0
5 2dFGRS TGN313Z015 G 12 01 38.9551360668 -01 17 30.999108331   19.119   17.426   ~ 4 0
6 2dFGRS TGN314Z003 G 12 02 26.556 -01 10 36.78   18.993   17.436   ~ 4 0
7 SDSS J120724.25+010740.7 G 12 07 24.258 +01 07 40.77           ~ 3 0
8 GAMA 47467 G 14 12 02.692 -00 37 50.81           ~ 2 0
9 SDSS J141344.70+014248.3 G 14 13 44.709 +01 42 48.34           ~ 3 0
10 SDSS J141457.56-013934.6 GiC 14 14 57.562 -01 39 34.65           ~ 4 0
11 SDSS J141612.09+520937.0 ? 14 16 12.09960 +52 09 37.0800           ~ 1 0
12 SDSS J142005.25+005922.3 G 14 20 05.252 +00 59 22.30           ~ 3 0
13 SDSS J142441.49-001944.1 G 14 24 41.494 -00 19 44.13           ~ 3 0
14 2dFGRS TGN413Z056 G 14 30 25.8442341309 +00 58 59.553993784   18.643   17.160   ~ 5 0
15 2MASX J14315615+0056025 rG 14 31 56.1446154555 +00 56 02.673566426   18.039   16.432   ~ 7 0
16 SDSS J143230.74-005721.7 G 14 32 30.7505946563 -00 57 21.779662427           ~ 2 0
17 SDSS J143404.10-015626.9 G 14 34 04.1015859067 -01 56 26.994901837           ~ 2 0
18 SDSS J143724.00-003228.6 GiC 14 37 24.004 -00 32 28.63           ~ 4 0
19 2dFGRS TGN347Z132 G 14 39 09.548 +00 25 05.30   18.918   17.434   ~ 4 0
20 SDSS J145155.71+012644.8 G 14 51 55.717 +01 26 44.84           ~ 3 0
21 2MASX J16270704+4326110 G 16 27 07.0289674740 +43 26 11.232583246           ~ 5 0

    Equat.    Gal    SGal    Ecl

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2020.11.28-20:58:55

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