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The ATLASGAL survey: distribution of cold dust in the Galactic plane. Combination with Planck data

dc.contributor.authorCSENGERI, T.,
hal.structure.identifierThe University of Edinburgh
dc.contributor.authorWEISS, A.,
dc.contributor.authorWYROWSKI, F.,
dc.contributor.authorMENTEN, K. M.,
hal.structure.identifierMars Desert Research Station [MDRS]
dc.contributor.authorURQUHART, J. S.,
hal.structure.identifierMax-Planck-Institut für Radioastronomie [MPIFR]
dc.contributor.authorLEURINI, S.,
dc.contributor.authorSCHULLER, F.,
dc.contributor.authorBEUTHER, H.,
hal.structure.identifierFORMATION STELLAIRE 2016
dc.contributor.authorBONTEMPS, Sylvain
hal.structure.identifierDepartamento de Astronomia [DAS]
dc.contributor.authorBRONFMAN, L.,
dc.contributor.authorHENNING, Th.,
hal.structure.identifierFORMATION STELLAIRE 2016
dc.contributor.authorSCHNEIDER, N.
dc.date.issued2016
dc.identifier.issn0004-6361
dc.description.abstractEnSensitive ground-based submillimeter surveys, such as ATLASGAL, provide a global view on the distribution of cold dense gas in the Galactic plane. Here we use the 353 GHz maps from the Planck/HFI instrument to complement the ground-based APEX/LABOCA observations with information on larger angular scales. The resulting maps reveal the distribution of cold dust in the inner Galaxy with a larger spatial dynamic range. We find examples of elongated structures extending over angular scales of 0.5 degree. Corresponding to >30 pc structures in projection at a distance of 3 kpc, these dust lanes are very extended and show large aspect ratios. Furthermore, we assess the fraction of dense gas ($f_{\rm DG}$), and estimate 2-5% (above A$_{\rm{v}}>$7 mag) on average in the Galactic plane. PDFs of the column density reveal the typically observed log-normal distribution for low- and exhibit an excess at high column densities. As a reference for extragalactic studies, we show the line-of-sight integrated N-PDF of the inner Galaxy, and derive a contribution of this excess to the total column density of $\sim2.2$%, above $N_{\rm H_2} = 2.92\times10^{22}$ cm$^{-2}$. Taking the total flux density, we provide an independent estimate of the mass of molecular gas in the inner Galaxy of $\sim1\times10^9\,M_{\odot}$, which is consistent with previous estimates using CO emission. From the mass and $f_{\rm DG}$ we estimate a Galactic SFR of $\dot M = 1.3\,M_{\odot}$ yr$^{-1}$. While the distribution of diffuse gas is homogenous in the inner Galaxy, the CMZ stands out with a higher dense gas fraction. The low star formation efficiency of the Milky Way is well explained by the low $f_{\rm DG}$ in the Galactic ISM, while the high $f_{\rm DG}$ towards the CMZ, despite its low star formation activity, suggests that, in that particular region of our Galaxy, high-density gas is not the bottleneck for star formation.
dc.language.isoen
dc.publisherEDP Sciences
dc.title.enThe ATLASGAL survey: distribution of cold dust in the Galactic plane. Combination with Planck data
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201526639
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA]
dc.identifier.arxiv1511.07145
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.A104
bordeaux.volume585
bordeaux.peerReviewedoui
hal.identifierhal-01238902
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01238902v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2016&rft.volume=585&rft.spage=id.A104&rft.epage=id.A104&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=CSENGERI,%20T.,&WEISS,%20A.,&WYROWSKI,%20F.,&MENTEN,%20K.%20M.,&URQUHART,%20J.%20S.,&rft.genre=article


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