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  • Zhou, JingNanjing University (författare)

Dense Gas and Star Formation in Nearby Infrared-bright Galaxies: APEX Survey of HCN and HCO+ J=2 -> 1

  • Artikel/kapitelEngelska2022

Förlag, utgivningsår, omfång ...

  • 2022-08-30
  • American Astronomical Society,2022
  • electronicrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:research.chalmers.se:b85c4473-98c7-4afa-ac76-93286b75ea9c
  • https://doi.org/10.3847/1538-4357/ac82ebDOI
  • https://research.chalmers.se/publication/531980URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:art swepub-publicationtype
  • Ämneskategori:ref swepub-contenttype

Anmärkningar

  • Both Galactic and extragalactic studies of star formation suggest that stars form directly from dense molecular gas. To trace such high volume density gas, HCN and HCO+ J = 1 -> 0 have been widely used for their high dipole moments, relatively high abundances, and often being the strongest lines after CO. However, HCN and HCO+ J = 1 -> 0 emission could arguably be dominated by the gas components at low volume densities. The HCN J = 2 -> 1 and HCO+ J = 2 -> 1 transitions, with more suitable critical densities (1.6 x 10(6) and 2.8 x 10(5) cm(-3)) and excitation requirements, would trace typical dense gas closely related to star formation. Here we report new observations of HCN J = 2 -> 1 and HCO+ J = 2 -> 1 toward 17 nearby infrared-bright galaxies with the APEX 12 m telescope. The correlation slopes between the luminosities of HCN J = 2 -> 1 and HCO+ J = 2 -> 1 and total infrared emission are 1.03 +/- 0.05 and 1.00 +/- 0.05, respectively. The correlations of their surface densities, normalized with the area of radio/submillimeter continuum, show even tighter relations (slopes: 0.99 +/- 0.03 and 1.02 +/- 0.03). The eight active galactic nucleus (AGN)-dominated galaxies show no significant difference from the 11 star-formation-dominated galaxies in the above relations. The average HCN/HCO+ ratios are 1.15 +/- 0.26 and 0.98 +/- 0.42 for AGN- and star-formation-dominated galaxies, respectively, without obvious dependencies on infrared luminosity, dust temperature, or infrared pumping. The Magellanic Clouds roughly follow the same correlations, expanding to 8 orders of magnitude. On the other hand, ultraluminous infrared galaxies with AGNs systematically lie above the correlations, indicating potential biases introduced by AGNs.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Zhang, Zhi-YuNanjing University (författare)
  • Gao, YuXiamen University,Chinese Academy of Sciences (författare)
  • Wang, JunzhiGuangxi University,Chinese Academy of Sciences (författare)
  • Shi, YongNanjing University (författare)
  • Gu, QiushengNanjing University (författare)
  • Yang, Chentao,1988Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)chentao (författare)
  • Wang, TaoNanjing University (författare)
  • Tan, Qing-HuaChinese Academy of Sciences (författare)
  • Nanjing UniversityXiamen University (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Astrophysical Journal: American Astronomical Society936:11538-43570004-637X

Internetlänk

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