ALMACAL V: absorption-selected galaxies with evidence for excited ISMs

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F19%3A00540055" target="_blank" >RIV/67985815:_____/19:00540055 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1093/mnrasl/sly187" target="_blank" >https://doi.org/10.1093/mnrasl/sly187</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnrasl/sly187" target="_blank" >10.1093/mnrasl/sly187</a>

Result language
angličtina
Original language name
ALMACAL V: absorption-selected galaxies with evidence for excited ISMs
Original language description
We present an analysis of multiple CO transitions (L-CO' similar to 10(9) K km s(-1)) in two z similar to 0.5 galaxies associated with one Ly alpha absorber towards J0238+1636. The CO spectral line energy distributions (CO SLEDs) of these galaxies appear distinct from that of typical star-forming galaxies at similar redshifts and is comparable with that of luminous infrared galaxies or active galactic nucleus (AGN). Indeed, these galaxies are associated with optically identified AGN activity. We infer that the CO line ratios and the alpha(CO) conversion factor differ from the Galactic values. Our findings suggest that at least a fraction of absorption-selected systems shows interstellar medium conditions deviating from those of normal star-forming galaxies. For a robust molecular gas mass calculation, it is therefore important to construct the CO SLED. Absorption line selection identifies systems with widely distributed gas, which may preferentially select interacting galaxies, which in turn will have more excited CO SLEDs than isolated galaxies. Furthermore, we raise the question whether quasar absorbers preferentially trace galaxy overdensities.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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