Star Cluster Formation in Orion A. (arXiv:2004.03668v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Lim_W/0/1/0/all/0/1">Wanggi Lim</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nakamura_F/0/1/0/all/0/1">Fumitaka Nakamura</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wu_B/0/1/0/all/0/1">Benjamin Wu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bisbas_T/0/1/0/all/0/1">Thomas G. Bisbas</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tan_J/0/1/0/all/0/1">Jonathan C. Tan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chambers_E/0/1/0/all/0/1">Edward Chambers</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bally_J/0/1/0/all/0/1">John Bally</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kong_S/0/1/0/all/0/1">Shuo Kong</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+McGehee_P/0/1/0/all/0/1">Peregrine McGehee</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lis_D/0/1/0/all/0/1">Dariusz C. Lis</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ossenkopf_Okada_V/0/1/0/all/0/1">Volker Ossenkopf-Okada</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sanchez_Monge_A/0/1/0/all/0/1">Álvaro Sánchez-Monge</a>
We introduce new analysis methods for studying the star cluster formation
processes in Orion A, especially examining the scenario of a cloud-cloud
collision. We utilize the CARMA-NRO Orion survey $^{13}$CO (1-0) data to
compare molecular gas to the properties of YSOs from the SDSS III IN-SYNC
survey. We show that the increase of $v_{rm 13CO} – v_{rm YSO}$ and $Sigma$
scatter o older YSOs can be signals of cloud-cloud collision. SOFIA-upGREAT
158$mu$m [CII] archival data toward the northern part of Orion A are also
compared to the $^{13}$CO data to test whether the position and velocity
offsets between the emission from these two transitions resemble those
predicted by a cloud-cloud collision model. We find that the northern part of
Orion A, including regions ONC-OMC-1, OMC-2, OMC-3 and OMC-4, shows qualitative
agreements with the cloud-cloud collision scenario, while in one of the
southern regions, NGC1999, there is no indication of such a process in causing
the birth of new stars. On the other hand, another southern cluster, L1641N,
shows slight tendencies of cloud-cloud collision. Overall, our results support
the cloud-cloud collision process as being an important mechanism for star
cluster formation in Orion A.
We introduce new analysis methods for studying the star cluster formation
processes in Orion A, especially examining the scenario of a cloud-cloud
collision. We utilize the CARMA-NRO Orion survey $^{13}$CO (1-0) data to
compare molecular gas to the properties of YSOs from the SDSS III IN-SYNC
survey. We show that the increase of $v_{rm 13CO} – v_{rm YSO}$ and $Sigma$
scatter o older YSOs can be signals of cloud-cloud collision. SOFIA-upGREAT
158$mu$m [CII] archival data toward the northern part of Orion A are also
compared to the $^{13}$CO data to test whether the position and velocity
offsets between the emission from these two transitions resemble those
predicted by a cloud-cloud collision model. We find that the northern part of
Orion A, including regions ONC-OMC-1, OMC-2, OMC-3 and OMC-4, shows qualitative
agreements with the cloud-cloud collision scenario, while in one of the
southern regions, NGC1999, there is no indication of such a process in causing
the birth of new stars. On the other hand, another southern cluster, L1641N,
shows slight tendencies of cloud-cloud collision. Overall, our results support
the cloud-cloud collision process as being an important mechanism for star
cluster formation in Orion A.
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