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The MALATANG Survey: Dense Gas and Star Formation from High Transition HCN and HCO+ maps of NGC253

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The MALATANG Survey : Dense Gas and Star Formation from High Transition HCN and HCO+ maps of NGC253. / Jiang, Xue-Jian; Greve, Thomas R.; Gao, Yu; Zhang, Zhi-Yu; Tan, Qinghua; Grijs, Richard de; Ho, Luis C.; Michalowski, Michal J.; Currie, Malcolm J.; Wilson, Christine D.; Brinks, Elias; Ao, Yiping; Zhao, Yinghe; He, Jinhua; Harada, Nanase; Yang, Chentao; Jiao, Qian; Chung, Aeree; Lee, Bumhyun; Smith, Matthew W. L.; Liu, Daizhong; Matsushita, Satoki; Shi, Yong; Imanishi, Masatoshi; Rawlings, Mark G.; Zhu, Ming; Eden, David; Davis, Timothy A.; Li, Xiaohu.

In: Monthly Notices of the Royal Astronomical Society: Letters, 24.03.2020.

Research output: Contribution to journalArticlepeer-review

Harvard

Jiang, X-J, Greve, TR, Gao, Y, Zhang, Z-Y, Tan, Q, Grijs, RD, Ho, LC, Michalowski, MJ, Currie, MJ, Wilson, CD, Brinks, E, Ao, Y, Zhao, Y, He, J, Harada, N, Yang, C, Jiao, Q, Chung, A, Lee, B, Smith, MWL, Liu, D, Matsushita, S, Shi, Y, Imanishi, M, Rawlings, MG, Zhu, M, Eden, D, Davis, TA & 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

APA

Jiang, 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., ... 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

Vancouver

Author

Jiang, Xue-Jian ; Greve, Thomas R. ; Gao, Yu ; Zhang, Zhi-Yu ; Tan, Qinghua ; Grijs, Richard de ; Ho, Luis C. ; Michalowski, Michal J. ; Currie, Malcolm J. ; Wilson, Christine D. ; Brinks, Elias ; Ao, Yiping ; Zhao, Yinghe ; He, Jinhua ; Harada, Nanase ; Yang, Chentao ; Jiao, Qian ; Chung, Aeree ; Lee, Bumhyun ; Smith, Matthew W. L. ; Liu, Daizhong ; Matsushita, Satoki ; Shi, Yong ; Imanishi, Masatoshi ; Rawlings, Mark G. ; Zhu, Ming ; Eden, David ; Davis, Timothy A. ; Li, Xiaohu. / The MALATANG Survey : Dense Gas and Star Formation from High Transition HCN and HCO+ maps of NGC253. In: Monthly Notices of the Royal Astronomical Society: Letters. 2020.

Bibtex

@article{cb8cbecc4bae45448c2dc91e24ad3e07,
title = "The MALATANG Survey: Dense Gas and Star Formation from High Transition HCN and HCO+ maps of NGC253",
abstract = " To 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. ",
keywords = "astro-ph.GA",
author = "Xue-Jian Jiang and Greve, {Thomas R.} and Yu Gao and Zhi-Yu Zhang and Qinghua Tan and Grijs, {Richard de} and Ho, {Luis C.} and Michalowski, {Michal J.} and Currie, {Malcolm J.} and Wilson, {Christine D.} and Elias Brinks and Yiping Ao and Yinghe Zhao and Jinhua He and Nanase Harada and Chentao Yang and Qian Jiao and Aeree Chung and Bumhyun Lee and Smith, {Matthew W. L.} and Daizhong Liu and Satoki Matsushita and Yong Shi and Masatoshi Imanishi and Rawlings, {Mark G.} and Ming Zhu and David Eden and Davis, {Timothy A.} and Xiaohu Li",
note = "This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. {\textcopyright} 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. ",
year = "2020",
month = mar,
day = "24",
doi = "10.1093/mnras/staa794",
language = "English",
journal = "Monthly Notices of the Royal Astronomical Society: Letters",
issn = "1745-3925",
publisher = "Oxford University Press",

}

RIS

TY - JOUR

T1 - The MALATANG Survey

T2 - Dense Gas and Star Formation from High Transition HCN and HCO+ maps of NGC253

AU - Jiang, Xue-Jian

AU - Greve, Thomas R.

AU - Gao, Yu

AU - Zhang, Zhi-Yu

AU - Tan, Qinghua

AU - Grijs, Richard de

AU - Ho, Luis C.

AU - Michalowski, Michal J.

AU - Currie, Malcolm J.

AU - Wilson, Christine D.

AU - Brinks, Elias

AU - Ao, Yiping

AU - Zhao, Yinghe

AU - He, Jinhua

AU - Harada, Nanase

AU - Yang, Chentao

AU - Jiao, Qian

AU - Chung, Aeree

AU - Lee, Bumhyun

AU - Smith, Matthew W. L.

AU - Liu, Daizhong

AU - Matsushita, Satoki

AU - Shi, Yong

AU - Imanishi, Masatoshi

AU - Rawlings, Mark G.

AU - Zhu, Ming

AU - Eden, David

AU - Davis, Timothy A.

AU - Li, Xiaohu

N1 - This 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.

PY - 2020/3/24

Y1 - 2020/3/24

N2 - To 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.

AB - To 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.

KW - astro-ph.GA

U2 - 10.1093/mnras/staa794

DO - 10.1093/mnras/staa794

M3 - Article

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

SN - 1745-3925

ER -