Adrien Guérou --- Compact dwarf galaxies with the GMOS-IFU and NGVS --Testing the continuity hypothesis. IRAP-OMP, Toulouse university ESO PhD student

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Elfrieda Nicholson
5 years ago
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Collaborators: Satellites & Streams Rogelio

ESO PhD student Eric Emsellem (ESO) Richard

Ferrarese (Herzberg Institute of Astrophysics)

1 Compact dwarf galaxies with the GMOS-IFU and NGVS --Testing the continuity hypothesis --- Collaborators: Satellites & Streams Rogelio Bernal Andreo IRAP-OMP, Toulouse university ESO PhD student Eric Emsellem (ESO) Richard McDermid (Macquarie University) Laura Ferrarese (Herzberg Institute of Astrophysics) Patrick Côté (Herzberg Institute of Astrophysics) ESO-Santiago, Chile

2 Rogelio Bernal Andreo

3 Largest population in cluster (in number) Rogelio Bernal Andreo Building blocks in LCDM theory

4 Mass size plane of galaxies Size Es / als r i p S ge s Adapted from Misgeld & Hilker 11, Updated by Voggel et al., in preparation des / dsph ces UCDs Galactic Nuclei GCs Mass

5 Mass size plane of galaxies Adapted from Pfeffer et al. 13 Size Es / als r i p S ge s Scenarios Evolution paths Stripping des / dsph ces UCDs Galactic Nuclei GCs Mass

6 Mass size plane of galaxies Adapted from Pfeffer et al. 13 Size Es /? als r i p S ge s Scenarios Evolution paths des / dsph ces UCDs Galactic Nuclei? Stripping Ram pressure Harassment Merging Gas accretion... GCs Mass

7 GMOS-IFU program Compact, low-mass ETGs Surface Brightness 1 in Virgo --8 observed Magnitude

Emsellem, 4) Stellar kinematics: MILES library (Sanchez-Blasquez,

8 NGVS - GIZ image GMOS-IFU program 5 x 7 σ(inst) ~ 55 km/s GMOS-IFU cube 4 λ[å] 54 Full spectral fitting: ppxf (Cappellari & Emsellem, 4) Stellar kinematics: MILES library (Sanchez-Blasquez, 6 ; Flacón-Barroso, 11) Stellar population: MIUSCAT library (Vazdeskis, 1)

9 Compact dwarfs: kinematics & stellar population / / /.3 7 / 13 / 6 / / / / / /. 6 / 1 5 / 16 / 1 8 / 11-1 / 1-4 / /.1 VCC / 11 6 / /-. 1 / 5 [Z/H] [Z/H ] VCC144 5 / 1 VCC1475 / 1-35 / 35 VCC1178 VC C119 VCC / 4 V CC / 8 Age (Gyr) Age (Gyr) (km/s) 4 σ (km/s) V (km/s) V (km/s) [Z/H] [Z/H ] -3 / 3 Age (Gyr) Age (Gyr) (km/s) V CC167 σ (km/s) V (km/s) V (km/s) - -3 / / / / Guérou et al., 15, ApJ arxiv Kinematics V : 3 4 km/s σ : 6 km/s Stellar population Age : Gyr [Z/H] : -.8. dex

10 VCC 1475: a Kinematically decoupled core (KDC) σ galaxy (Krajnović, 11) A few other found in des/dsph (Toloba, 14 (a,b), Geha, 5)

11 VCC197 (NGC4486b): a central BH...? Central BH of ~ 18 MΘ (Kormendy & Bender, 1997) 5% of its dynamical mass (~1.1 x 11 MΘ)

12 Younger & more [Z/H] rich cores SF episode at the center Scenarios: Secular processes External processes: - Gas accretion - Grav. interaction

13 Low-mass, compact galaxies in the Mass-size plane Dynamical mass JAM : Anisotropic Jeans equation Virial theorem : M Ξ β(n).σ(re).re / G (equivalent, Cappellari et al. 13) Effective Radius, Re NGVS: Photometry i-band images (Ferrarese, L. et al. 1)

14 Low-mass, compact galaxies in the Mass-size plane 6 massive ETGs (A3D, Mk < -1.5) 39 low-mass ETGs (SMAKCED survey)

15 Low-mass, compact galaxies in the Mass-size plane 6 massive ETGs (A3D, Mk < -1.5) 39 low-mass ETGs (SMAKCED survey) 8 low-mass, COMPACT ETGs (GMOS-IFU program)

16 GMOS-IFU program : results AGE Single Stellar Population within Re --- COMPACT = OLDER --CONTINUITY MASSIVE & LOW-MASS Guérou et al., 15, ApJ arxiv

17 GMOS-IFU program : results [Fe/H] Single Stellar Population within Re --- COMPACT MORE METAL-RICH --CONTINUITY MASSIVE & LOW-MASS Guérou et al., 15, ApJ arxiv

18 GMOS-IFU program : results 5 /s km /s [Fe/H] 5 k m/ s km k m/ s 3 km 1 k m/ s σ = /s AGE Velocity dispersion predictor of AGE and [Fe/H] --(Graves & Faber 1 ; Wake et al. 1 ; Cappellari et al. 13, McDermid et al. 15) --- extended to low-mass galaxies

19 NGVS survey 9 hours in Virgo (CFHT-MegaCam) [Ferrarese, L. et al. 1] u*, g, i, z down to μg ~ 9 mag.arcsec Streams [Talk of Duc, P.A.] GCs [Durrell, P. et al, 14] UCDs [Zhang, H.-X., 15] Dwarfs [Toloba (in prep.)] [Guerou et al. 15 (NGVS XII, accepted in ApJ) arxiv , yesterday] Photometry --Probing environment

20 Probing the environment with NGVS Σ1 = Ltot (R1 ) / Lgal Relative luminosity density Lmax / L = Lmax (R1 ) / Lgal Most luminous companion

21 Probing the environment with NGVS Lmax / L Σ1 COMPACT : CLOSE TO MASSIVE GALAXIES Guérou et al., 15, ApJ arxiv

22 Probing the environment with NGVS Lmax / L COMPACT : CLOSE TO MASSIVE GALAXIES Guérou et al., 15, ApJ arxiv

23 Cluster environment from simulations TIME (Adapted from Lisker et al., 13) ~ 7 Gyr spent in M > 11 MΘ DM MASS LOSS ~ 8% of DM mass loss COMPACT galaxies ~ 9 Gyr old --Strong environmental influence (companions, pair, cluster) DENSITY

24 Conclusions D kinematics and stellar populations of 8 compact, low-mass ETGs in the Virgo Cluster ( MΘ, 7 pc) Trend for a continuity of the stellar populations in the mass-size plane with massive ETGs Strong influence and variation of the environment (pairs, group, cluster)

Kinematic Properties and Dark Matter Halos of Dwarf Early-Type Galaxies in the Virgo Cluster

Kinematic Properties and Dark Matter Halos of Dwarf Early-Type Galaxies in the Virgo Cluster Elisa Toloba (Fulbright Fellow at UCO/Lick & Carnegie Observatories) Collaborators: Alessandro Boselli (LAM-Marseille)