The ALPINE-ALMA [CII] survey: The contribution of major mergers to the galaxy mass assembly at z\textasciitilde5. Romano, M., Cassata, P., Morselli, L., Jones, G. C., Ginolfi, M., Zanella, A., Béthermin, M., Capak, P., Faisst, A., Le Fèvre, O., Schaerer, D., Silverman, J. D., Yan, L., Bardelli, S., Boquien, M., Cimatti, A., Dessauges-Zavadsky, M., Enia, A., Fujimoto, S., Gruppioni, C., Hathi, N. P., Ibar, E., Koekemoer, A. M., Lemaux, B. C., Rodighiero, G., Vergani, D., Zamorani, G., & Zucca, E. Technical Report July, 2021. Publication Title: arXiv e-prints ADS Bibcode: 2021arXiv210710856R Type: article
The ALPINE-ALMA [CII] survey: The contribution of major mergers to the galaxy mass assembly at z\textasciitilde5 [link]Paper  abstract   bibtex   
Galaxy mergers are thought to be one of the main mechanisms of the mass assembly of galaxies. Recently, many works have suggested a possible increase in the fraction of major mergers in the early Universe, reviving the debate on which processes (e.g., cold accretion, star formation, mergers) most contribute to the mass build-up of galaxies through cosmic time. To estimate the importance of major mergers in this context, we make use of the new data collected by the ALMA Large Program to INvestigate [CII] at Early times (ALPINE), which observed the [CII] 158 \${\textbackslash}mu\$m emission line from a sample of 75 main-sequence star-forming galaxies at 4.4 \textless z \textless 5.9. We used, for the first time, the morpho-kinematic information provided by the [CII] emission to obtain the fraction of major mergers (\$f_\{MM\}\$) at z\textasciitilde5. By adopting different prescriptions for the merger timescales (\$T_\{MM\}\$), we converted this fraction into the merger rate per galaxy (\$R_\{MM\}\$) and per volume (\${\textbackslash}Gamma_\{MM\}\$). We then combined our results with those at lower redshifts from the literature, computing the cosmic evolution of the merger fraction. This is described by a rapid increase from z\textasciitilde0 to higher redshifts, a peak at z\textasciitilde3, and a slow decrease towards earlier epochs. Depending on the timescale prescription used, this fraction translates into a merger rate ranging between \textasciitilde0.1 and \textasciitilde4.0 Gyr\${\textasciicircum}\{-1\}\$ at z\textasciitilde5. Finally, we compare the specific star formation and star-formation rate density with the analogous quantities from major mergers. Our new ALPINE data reveal the presence of a significant merging activity in the early Universe. However, whether this population of mergers can provide a relevant contribution to the galaxy mass assembly at these redshifts and through the cosmic epochs is strongly dependent on the assumption of the merger timescale.
@techreport{2021arXiv210710856R,
	title = {The {ALPINE}-{ALMA} [{CII}] survey: {The} contribution of major mergers to the galaxy mass assembly at z{\textasciitilde}5},
	shorttitle = {The {ALPINE}-{ALMA} [{CII}] survey},
	url = {https://ui.adsabs.harvard.edu/abs/2021arXiv210710856R},
	abstract = {Galaxy mergers are thought to be one of the main mechanisms of the mass assembly of galaxies. Recently, many works have suggested a possible increase in the fraction of major mergers in the early Universe, reviving the debate on which processes (e.g., cold accretion, star formation, mergers) most contribute to the mass build-up of galaxies through cosmic time. To estimate the importance of major mergers in this context, we make use of the new data collected by the ALMA Large Program to INvestigate [CII] at Early times (ALPINE), which observed the [CII] 158 \${\textbackslash}mu\$m emission line from a sample of 75 main-sequence star-forming galaxies at 4.4 {\textless} z {\textless} 5.9. We used, for the first time, the morpho-kinematic information provided by the [CII] emission to obtain the fraction of major mergers (\$f\_\{MM\}\$) at z{\textasciitilde}5. By adopting different prescriptions for the merger timescales (\$T\_\{MM\}\$), we converted this fraction into the merger rate per galaxy (\$R\_\{MM\}\$) and per volume (\${\textbackslash}Gamma\_\{MM\}\$). We then combined our results with those at lower redshifts from the literature, computing the cosmic evolution of the merger fraction. This is described by a rapid increase from z{\textasciitilde}0 to higher redshifts, a peak at z{\textasciitilde}3, and a slow decrease towards earlier epochs. Depending on the timescale prescription used, this fraction translates into a merger rate ranging between {\textasciitilde}0.1 and {\textasciitilde}4.0 Gyr\${\textasciicircum}\{-1\}\$ at z{\textasciitilde}5. Finally, we compare the specific star formation and star-formation rate density with the analogous quantities from major mergers. Our new ALPINE data reveal the presence of a significant merging activity in the early Universe. However, whether this population of mergers can provide a relevant contribution to the galaxy mass assembly at these redshifts and through the cosmic epochs is strongly dependent on the assumption of the merger timescale.},
	urldate = {2021-09-07},
	author = {Romano, M. and Cassata, P. and Morselli, L. and Jones, G. C. and Ginolfi, M. and Zanella, A. and Béthermin, M. and Capak, P. and Faisst, A. and Le Fèvre, O. and Schaerer, D. and Silverman, J. D. and Yan, L. and Bardelli, S. and Boquien, M. and Cimatti, A. and Dessauges-Zavadsky, M. and Enia, A. and Fujimoto, S. and Gruppioni, C. and Hathi, N. P. and Ibar, E. and Koekemoer, A. M. and Lemaux, B. C. and Rodighiero, G. and Vergani, D. and Zamorani, G. and Zucca, E.},
	month = jul,
	year = {2021},
	note = {Publication Title: arXiv e-prints
ADS Bibcode: 2021arXiv210710856R
Type: article},
	keywords = {Astrophysics - Astrophysics of Galaxies},
}
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