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dc.contributor.authorJiang, Xue-Jian
dc.contributor.authorGreve, Thomas R.
dc.contributor.authorGao, Yu
dc.contributor.authorZhang, Zhi-Yu
dc.contributor.authorTan, Qinghua
dc.contributor.authorGrijs, Richard de
dc.contributor.authorHo, Luis C.
dc.contributor.authorMichalowski, Michal J.
dc.contributor.authorCurrie, Malcolm J.
dc.contributor.authorWilson, Christine D.
dc.contributor.authorBrinks, Elias
dc.contributor.authorAo, Yiping
dc.contributor.authorZhao, Yinghe
dc.contributor.authorHe, Jinhua
dc.contributor.authorHarada, Nanase
dc.contributor.authorYang, Chentao
dc.contributor.authorJiao, Qian
dc.contributor.authorChung, Aeree
dc.contributor.authorLee, Bumhyun
dc.contributor.authorSmith, Matthew W. L.
dc.contributor.authorLiu, Daizhong
dc.contributor.authorMatsushita, Satoki
dc.contributor.authorShi, Yong
dc.contributor.authorImanishi, Masatoshi
dc.contributor.authorRawlings, Mark G.
dc.contributor.authorZhu, Ming
dc.contributor.authorEden, David
dc.contributor.authorDavis, Timothy A.
dc.contributor.authorLi, Xiaohu
dc.date.accessioned2020-10-08T00:07:06Z
dc.date.available2020-10-08T00:07:06Z
dc.date.issued2020-03-24
dc.identifier.citationJiang , X-J , Greve , T R , Gao , Y , Zhang , Z-Y , Tan , Q , Grijs , R D , Ho , L C , Michalowski , M J , Currie , M J , Wilson , C D , Brinks , E , Ao , Y , Zhao , Y , He , J , Harada , N , Yang , C , Jiao , Q , Chung , A , Lee , B , Smith , M W L , Liu , D , Matsushita , S , Shi , Y , Imanishi , M , Rawlings , M G , Zhu , M , Eden , D , Davis , T A & Li , X 2020 , ' The MALATANG Survey : Dense Gas and Star Formation from High Transition HCN and HCO+ maps of NGC253 ' , Monthly Notices of the Royal Astronomical Society: Letters . https://doi.org/10.1093/mnras/staa794
dc.identifier.issn1745-3925
dc.identifier.otherPURE: 20238450
dc.identifier.otherPURE UUID: cb8cbecc-4bae-4544-8c2d-c91e24ad3e07
dc.identifier.otherArXiv: http://arxiv.org/abs/2003.06595v1
dc.identifier.otherScopus: 85085378736
dc.identifier.otherORCID: /0000-0002-7758-9699/work/81741404
dc.identifier.urihttp://hdl.handle.net/2299/23213
dc.descriptionThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
dc.description.abstractTo study the high-transition dense-gas tracers and their relationships to the star formation of the inner $\sim$ 2 kpc circumnuclear region of NGC253, we present HCN $J=4-3$ and HCO$^+ J=4-3$ maps obtained with the James Clerk Maxwell Telescope (JCMT). With the spatially resolved data, we compute the concentration indices $r_{90}/r_{50}$ for the different tracers. HCN and HCO$^+$ 4-3 emission features tend to be centrally concentrated, which is in contrast to the shallower distribution of CO 1-0 and the stellar component. The dense-gas fraction ($f_\text{dense}$, traced by the velocity-integrated-intensity ratios of HCN/CO and HCO$^+$/CO) and the ratio $R_\text{31}$ (CO 3-2/1-0) decline towards larger galactocentric distances, but increase with higher SFR surface density. The radial variation and the large scatter of $f_\text{dense}$ and $R_\text{31}$ imply distinct physical conditions in different regions of the galactic disc. The relationships of $f_\text{dense}$ versus $\Sigma_\text{stellar}$, and SFE$_\text{dense}$ versus $\Sigma_\text{stellar}$ are explored. SFE$_\text{dense}$ increases with higher $\Sigma_\text{stellar}$ in this galaxy, which is inconsistent with previous work that used HCN 1-0 data. This implies that existing stellar components might have different effects on the high-$J$ HCN and HCO$^+$ than their low-$J$ emission. We also find that SFE$_\text{dense}$ seems to be decreasing with higher $f_\text{dense}$, which is consistent with previous works, and it suggests that the ability of the dense gas to form stars diminishes when the average density of the gas increases. This is expected in a scenario where only the regions with high-density contrast collapse and form stars.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society: Letters
dc.subjectastro-ph.GA
dc.titleThe MALATANG Survey : Dense Gas and Star Formation from High Transition HCN and HCO+ maps of NGC253en
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/staa794
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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