Stored in the archives: Uncovering the CN/CO intensity ratio with ALMA in nearby U/LIRGs

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A90106%2F24%3A00616888" target="_blank" >RIV/67985815:90106/24:00616888 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1093/mnras/stad3310" target="_blank" >https://doi.org/10.1093/mnras/stad3310</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stad3310" target="_blank" >10.1093/mnras/stad3310</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Stored in the archives: Uncovering the CN/CO intensity ratio with ALMA in nearby U/LIRGs

Popis výsledku v původním jazyce

We present an archival Atacama Large Millimeter/submillimeter Array (ALMA) study of the cyanide radical (CN) N = 1 0/carbon monoxide (CO) J = 1 0 intensity ratio in nearby (z < 0.05) ultra-luminous and luminous infrared galaxies (U/LIRGs). We identify 16 U/LIRGs that have been observed in both CN and CO lines at similar to 500 pc resolution based on 16 different ALMA projects. We measure the (CN bright)/CO and (CN bright)/(CN faint) intensity ratios at an ensemble of molecular clouds scales (CN bright = CN N = 1 0, J = 3/2 1/2, CN faint = CN N = 1 0, J = 1/2 1/2 hyperfine groupings). Our global measured (CN bright)/CO ratios range 0.02-0.15 in LIRGs and 0.08-0.17 in ULIRGs. We attribute the larger spread in LIRGs to the variety of galaxy environments included in our sample. Overall, we find that the (CN bright)/CO ratio is higher in nuclear regions, where the physical and excitation conditions favour increased CN emission relative to the disc regions. 10 out of 11 galaxies which contain well-documented active galactic nuclei show higher ratios in the nucleus compared with the disc. Finally, we measure the median resolved (CN bright)/(CN faint) ratio and use it to estimate the total integrated CN line optical depth in ULIRGs (tau similar to 0.96) and LIRGs (tau similar to 0.23). The optical depth difference is likely due to the higher molecular gas surface densities found in the more compact ULIRG systems.

Název v anglickém jazyce

Stored in the archives: Uncovering the CN/CO intensity ratio with ALMA in nearby U/LIRGs

Popis výsledku anglicky

We present an archival Atacama Large Millimeter/submillimeter Array (ALMA) study of the cyanide radical (CN) N = 1 0/carbon monoxide (CO) J = 1 0 intensity ratio in nearby (z < 0.05) ultra-luminous and luminous infrared galaxies (U/LIRGs). We identify 16 U/LIRGs that have been observed in both CN and CO lines at similar to 500 pc resolution based on 16 different ALMA projects. We measure the (CN bright)/CO and (CN bright)/(CN faint) intensity ratios at an ensemble of molecular clouds scales (CN bright = CN N = 1 0, J = 3/2 1/2, CN faint = CN N = 1 0, J = 1/2 1/2 hyperfine groupings). Our global measured (CN bright)/CO ratios range 0.02-0.15 in LIRGs and 0.08-0.17 in ULIRGs. We attribute the larger spread in LIRGs to the variety of galaxy environments included in our sample. Overall, we find that the (CN bright)/CO ratio is higher in nuclear regions, where the physical and excitation conditions favour increased CN emission relative to the disc regions. 10 out of 11 galaxies which contain well-documented active galactic nuclei show higher ratios in the nucleus compared with the disc. Finally, we measure the median resolved (CN bright)/(CN faint) ratio and use it to estimate the total integrated CN line optical depth in ULIRGs (tau similar to 0.96) and LIRGs (tau similar to 0.23). The optical depth difference is likely due to the higher molecular gas surface densities found in the more compact ULIRG systems.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

—

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

1365-2966

Svazek periodika

527

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

28

Strana od-do

2963-2990

Kód UT WoS článku

001143378500102

EID výsledku v databázi Scopus

2-s2.0-85178636644