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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/31311
Title: Dense molecular gas properties on 100 pc scales across the disc of NGC 3627
Authors: Bešlić, I.
Barnes, A. T.
Bigiel, F.
Puschnig, J.
Pety, J.
Herrera Contreras, C.
Leroy, A. K.
Usero, A.
Schinnerer, E.
Meidt, S. E.
Emsellem, E.
Hughes, A.
Faesi, C.
Kreckel, K.
BELFIORE, FRANCESCO MICHEL CONCETTO 
Chevance, M.
den Brok, J. S.
Eibensteiner, C.
Glover, S. C. O.
Grasha, K.
Jimenez-Donaire, M. J.
Klessen, R. S.
Kruijssen, J. M. D.
Liu, D.
Pessa, I.
Querejeta, M.
Rosolowsky, E.
Saito, T.
Santoro, F.
Schruba, A.
Sormani, M. C.
Williams, T. G.
Issue Date: 2021
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 506
Issue: 1
First Page: 963
Abstract: It is still poorly constrained how the densest phase of the interstellar medium varies across galactic environment. A large observing time is required to recover significant emission from dense molecular gas at high spatial resolution, and to cover a large dynamic range of extragalactic disc environments. We present new NOrthern Extended Millimeter Array (NOEMA) observations of a range of high critical density molecular tracers (HCN, HNC, HCO<SUP>+</SUP>) and CO isotopologues (<SUP>13</SUP>CO, C<SUP>18</SUP>O) towards the nearby (11.3 Mpc) strongly barred galaxy NGC 3627. These observations represent the current highest angular resolution (1.85 arcsec; 100 pc) map of dense gas tracers across a disc of a nearby spiral galaxy, which we use here to assess the properties of the dense molecular gas, and their variation as a function of galactocentric radius, molecular gas, and star formation. We find that the HCN(1-0)/CO(2-1) integrated intensity ratio does not correlate with the amount of recent star formation. Instead, the HCN(1-0)/CO(2-1) ratio depends on the galactic environment, with differences between the galaxy centre, bar, and bar-end regions. The dense gas in the central 600 pc appears to produce stars less efficiently despite containing a higher fraction of dense molecular gas than the bar ends where the star formation is enhanced. In assessing the dynamics of the dense gas, we find the HCN(1-0) and HCO<SUP>+</SUP>(1-0) emission lines showing multiple components towards regions in the bar ends that correspond to previously identified features in CO emission. These features are cospatial with peaks of Hα emission, which highlights that the complex dynamics of this bar-end region could be linked to local enhancements in the star formation.
URI: http://hdl.handle.net/20.500.12386/31311
URL: https://academic.oup.com/mnras/article/506/1/963/6311820
http://arxiv.org/abs/2106.09742v1
ISSN: 0035-8711
DOI: 10.1093/mnras/stab1776
Bibcode ADS: 2021MNRAS.506..963B
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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