Table 1.
Discovered major merger events in NGC 1380 and NGC 1427.
| Galaxy name | M* | M∗,Ex1 | Time of Merger | Redshift | M∗,ExSitu |
|---|---|---|---|---|---|
| Milky Way | 5 × 1010 M⊙ | 3−6 × 108 M⊙ | 10 Gyr ago | z ∼ 1.8 | – |
| Andromeda | 1.3 × 1011 M⊙ | 2 × 1010 M⊙ | 2 Gyr ago | z ∼ 0.15 | – |
| NGC 1380 | (1.8 ± 0.2) × 1011 M⊙ |  M⊙ |
10 Gyr ago | z ∼ 1.8 |  M⊙ |
| NGC 1427 | (5.6 ± 0.6) × 1010 M⊙ |  M⊙ |
t ≲ 8 Gyr ago | z ≲ 1 |  M⊙ |
Notes.
Discovered major merger events in NGC 1380 and NGC 1427 in comparison with past mergers in the Milky Way and the Andromeda galaxy. The six columns from left to right are: galaxy name, galaxy’s current total stellar mass (M*), stellar mass of the most massive merger (M∗,Ex1), time of the last massive merger, redshift of the last massive merger, and total ex situ stellar mass (M∗,ExSitu). The total stellar mass of the Milky Way is adopted from Bland-Hawthorn & Gerhard (2016), and its merger mass and time are from Helmi et al. (2018) and Belokurov et al. (2020). The total stellar mass of Andromeda is adopted from Corbelli et al. (2010), and its merger mass and merger time are from D’Souza & Bell (2018b). The errors on NGC 1380 and NGC 1427 indicate the 1σ uncertainties of our results.
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