Modelling the baryon cycle in low-mass galaxy encounters: the case of NGC 4490 and NGC 4485
Modelling the baryon cycle in low-mass galaxy encounters: the case of NGC 4490 and NGC 4485
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模拟低质量星系相遇中的重子周期:NGC 4490 和 NGC 4485 的案例
DOI:
10.1093/mnras/sty2052
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发表时间:
2018
影响因子:
4.8
通讯作者:
Kallivayalil, Nitya
中科院分区:
文献类型:
--
作者:
Pearson, Sarah;Privon, George C;Besla, Gurtina;Putman, Mary E;Martínez-Delgado, David;Johnston, Kathryn V;Gabany, R Jay;Patton, David R;Kallivayalil, Nitya
Discoveries of low-mass galaxy pairs and groups are increasing. Studies indicate that dwarf galaxy pairs are gas rich in the field and exhibit elevated star formation rates, suggestive of interactions. Lacking are dynamical models of observed dwarf galaxy pairs to disentangle the physical processes regulating their baryon cycles. We present new optical data and the first detailed theoretical model of an observed tidal encounter between two isolated low-mass galaxies (NGC 4490 and NGC 4485). This system is an isolated analogue of the Magellanic Clouds and is surrounded by a ∼50 kpc extended Hienvelope. We use hybridN-body and test-particle simulations along with a visualization interface (Identikit) to simultaneously reproduce the observed present-day morphology and kinematics. Our results demonstrate how repeated encounters between two dwarf galaxies can ‘park’ baryons at very large distances, without the aid of environmental effects. Our best match to the data is an 8:1 mass ratio encounter where a one-armed spiral is induced in the NGC 4490-analogue, which we postulate explains the nature of diffuse starlight presented in the new optical data. We predict that the pair will fully merge in ∼370 Myr, but that the extended tidal features will continue to evolve and return to the merged remnant over ∼5 Gyr. This pre-processing of baryons will affect the efficiency of gas stripping if such dwarf pairs are accreted by a massive host. In contrast, in isolated environments this study demonstrates how dwarf–dwarf interactions can create a long-lived supply of gas to the merger remnant.
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DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
A. Emerick;M. M. Low;J. Grcevich;A. Gatto
通讯作者:
A. Gatto
影响因子:
6.5
作者:
F. Lelli;M. Verheijen;F. Fraternali;Renzo Sancisi University of Groningen;U. Bologna;I. Bologna
通讯作者:
F. Lelli;M. Verheijen;F. Fraternali;Renzo Sancisi University of Groningen;U. Bologna;I. Bologna
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
K. Bekki
通讯作者:
K. Bekki
DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
C. Sengupta;T. Scott;S. Paudel;D. Saikia;K. Dwarakanath;B. Sohn
通讯作者:
B. Sohn
DOI:
10.1088/0004-637x/692/2/955
发表时间:
2008-01
期刊:
The Astrophysical Journal
影响因子:
--
作者:
D. Martinez-Delgado;D. Martinez-Delgado;M. Pohlen;M. Pohlen;R. J. Gabany;S. Majewski;J. Peñarrubia;C. Palma;C. Palma;C. Palma
通讯作者:
D. Martinez-Delgado;D. Martinez-Delgado;M. Pohlen;M. Pohlen;R. J. Gabany;S. Majewski;J. Peñarrubia;C. Palma;C. Palma;C. Palma