Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 2030-2041 |
| Journal | Monthly Notices of the Royal Astronomical Society |
| Volume | 477 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Jun 2018 |
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Formation of S0s via disc accretion around high-redshift compact ellipticals. / Diaz, Jonathan; Bekki, Kenji; Forbes, Duncan A.; Couch, Warrick J.; Drinkwater, Michael J.; Deeley, Simon.
In: Monthly Notices of the Royal Astronomical Society, Vol. 477, No. 2, 06.2018, p. 2030-2041.Research output: Contribution to journal › Article
TY - JOUR
T1 - Formation of S0s via disc accretion around high-redshift compact ellipticals
AU - Diaz, Jonathan
AU - Bekki, Kenji
AU - Forbes, Duncan A.
AU - Couch, Warrick J.
AU - Drinkwater, Michael J.
AU - Deeley, Simon
PY - 2018/6
Y1 - 2018/6
N2 - We present hydrodynamical N-body models which demonstrate that elliptical galaxies can transform into S0s by acquiring a disc. In particular, we show that the merger with a massive gas-rich satellite can lead to the formation of a baryonic disc around an elliptical. We model the elliptical as a massive, compact galaxy which could be observed as a `red nugget' in the high-z universe. This scenario contrasts with existing S0 formation scenarios in the literature in two important ways. First, the progenitor is an elliptical galaxy whereas scenarios in the literature typically assume a spiral progenitor. Second, the physical conditions underlying our proposed scenario can exist in low-density environments such as the field, in contrast to scenarios in the literature which typically address dense environments like clusters and groups. As a consequence, S0s in the field may be the most likely candidates to have evolved from elliptical progenitors. Our scenario also naturally explains recent observations which indicate that field S0s may have older bulges than discs, contrary to cluster S0s which seem to have older discs than bulges.
AB - We present hydrodynamical N-body models which demonstrate that elliptical galaxies can transform into S0s by acquiring a disc. In particular, we show that the merger with a massive gas-rich satellite can lead to the formation of a baryonic disc around an elliptical. We model the elliptical as a massive, compact galaxy which could be observed as a `red nugget' in the high-z universe. This scenario contrasts with existing S0 formation scenarios in the literature in two important ways. First, the progenitor is an elliptical galaxy whereas scenarios in the literature typically assume a spiral progenitor. Second, the physical conditions underlying our proposed scenario can exist in low-density environments such as the field, in contrast to scenarios in the literature which typically address dense environments like clusters and groups. As a consequence, S0s in the field may be the most likely candidates to have evolved from elliptical progenitors. Our scenario also naturally explains recent observations which indicate that field S0s may have older bulges than discs, contrary to cluster S0s which seem to have older discs than bulges.
KW - galaxies: elliptical and lenticular
KW - galaxies: kinematics and dynamics
KW - galaxies: dwarf
U2 - 10.1093/mnras/sty743
DO - 10.1093/mnras/sty743
M3 - Article
VL - 477
SP - 2030
EP - 2041
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 2
ER -