2017A&A...606A..62T


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST22:09:26

2017A&A...606A..62T - Astronomy and Astrophysics, volume 606A, 62-62 (2017/10-1)

CALIFA reveals prolate rotation in massive early-type galaxies: A polar galaxy merger origin?

TSATSI A., LYUBENOVA M., VAN DE VEN G., CHANG J., AGUERRI J.A.L., FALCON-BARROSO J. and MACCIO A.V.

Abstract (from CDS):

We present new evidence for eight early-type galaxies (ETGs) from the CALIFA Survey that show clear rotation around their major photometric axis ("prolate rotation"). These are LSBCF560-04, NGC 0647, NGC 0810, NGC 2484, NGC 4874, NGC 5216, NGC 6173, and NGC 6338. Including NGC 5485, a known case of an ETG with stellar prolate rotation, as well as UGC 10695, a further candidate for prolate rotation, we report ten CALIFA galaxies in total that show evidence for such a feature in their stellar kinematics. Prolate rotators correspond to ∼9% of the volume-corrected sample of CALIFA ETGs, a fraction much higher than previously reported. We find that prolate rotation is more common (∼27%) among the most massive ETGs (M*≥2x1011M). We investigated the implications of these findings by studying N-body merger simulations, and we show that a prolate ETG with rotation around its major axis could be the result of a major polar merger, with the amplitude of prolate rotation depending on the initial bulge-to-total stellar mass ratio of its progenitor galaxies. Additionally, we find that prolate ETGs resulting from this formation scenario show a correlation between their stellar line-of-sight velocity and higher order moment h3, opposite to typical oblate ETGs, as well as a double peak of their stellar velocity dispersion along their minor axis. Finally, we investigated the origin of prolate rotation in polar galaxy merger remnants. Our findings suggest that prolate rotation in massive ETGs might be more common than previously expected, and can help toward a better understanding of their dynamical structure and formation origin.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: formation - galaxies: kinematics and dynamics - galaxies: structure - galaxies: stellar content - galaxies: stellar content

Simbad objects: 26

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Number of rows : 26

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 342 0
2 NGC 647 LIN 01 39 56.193 -09 14 32.63   15   13.03   ~ 22 0
3 IC 179 GiG 02 00 11.515 +38 01 17.14   13.4       ~ 47 0
4 NGC 810 LIN 02 05 28.563 +13 15 05.88   15.4       ~ 32 1
5 NGC 1052 GiP 02 41 04.79851 -08 15 20.7517 11.84 11.41 10.47 10.71   ~ 1142 2
6 Anon 0609-33.1 G 06 11 40 -33 07.8           ~ 8 0
7 MCG+03-20-011 BiC 07 46 18.606 +18 22 07.26   15.3       ~ 22 0
8 3C 189 QSO 07 58 28.10816 +37 47 11.8073   14.15 14.9     ~ 228 1
9 NGC 2749 GiG 09 05 21.313 +18 18 47.25   13.3       ~ 81 0
10 NGC 3923 GiG 11 51 01.783 -28 48 22.36 11.41 10.59 9.80 8.88   ~ 398 1
11 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1114 0
12 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 798 0
13 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1012 1
14 NGC 4473 GiG 12 29 48.878 +13 25 45.55 11.60 11.16 10.20     ~ 601 1
15 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6207 3
16 NGC 4589 LIN 12 37 25.0 +74 11 31   12.0       ~ 261 1
17 NGC 4874 LIN 12 59 35.709 +27 57 33.80 13.01 13.7 11.40 12.122 11.386 ~ 713 3
18 NGC 5216 GiP 13 32 06.9096470880 +62 42 02.417160507   16.80 16.14     ~ 108 0
19 NGC 5485 LIN 14 07 11.312 +55 00 05.47 14.34 13.82 12.22     ~ 221 0
20 NGC 5557 GiG 14 18 25.708 +36 29 37.28   12.2       ~ 196 0
21 NGC 5982 LIN 15 38 39.778 +59 21 21.21   12.4       ~ 277 0
22 NGC 6173 LIN 16 29 44.917 +40 48 41.80   14.0       ~ 140 0
23 UGC 10695 LIN 17 05 05.603 +43 02 35.67   14.7       ~ 36 0
24 NGC 6338 Bla 17 15 23.0 +57 24 40   14.2   8   ~ 143 2
25 NGC 7052 rG 21 18 33.047 +26 26 48.65 15.52 14.85 13.09     ~ 298 1
26 NGC 7626 rG 23 20 42.524 +08 13 01.43   12.8       ~ 402 1

    Equat.    Gal    SGal    Ecl

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2020.07.03-22:09:26

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