ISOTOPOLOGUES OF DENSE GAS TRACERS IN NGC 1068

Junzhi Wang*, Jianjie Qiu, Yong Shi, Jiangshui Zhang, Min Fang, Zhiyu Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We present observations of isotopic lines of dense gas tracers toward the nuclear region of nearby Seyfert 2 galaxy NGC 1068 with the IRAM 30 m telescope and the Atacama Pathfinder Experiment (APEX) 12 m telescope. We detected four isotopic lines ((HCN)-C-13 1-0, (HCO+)-C-13 1-0, (HNC)-C-13 1-0, and (HCO+)-O-18 1-0) at the 3 mm band with the IRAM 30m telescope and obtained upper limits of other lines. We calculated optical depths of dense gas tracers with the detected isotopic lines of HCN 1-0, HCO+ 1-0, and HNC 1-0. We find that the N-14/N-15 abundance ratio is greater than 420 if we adopt the upper limit of (HCN)-N-15(1-0) emission. Combining this with fluxes of 1-0 lines from IRAM 30 m observations and the upper limit of 3-2 lines from APEX 12 m observations, we also estimated the excitation condition of molecular gas in the nuclear region of NGC 1068, which is less dense than that in the extreme starburst regions of galaxies.

Original languageEnglish
Article number57
Number of pages5
JournalAstrophysical Journal
Volume796
Issue number1
DOIs
Publication statusPublished - 20 Nov 2014

Keywords

  • galaxies: active
  • galaxies: individual (NGC 1068)
  • galaxies: ISM
  • NUCLEAR STARBURST ENVIRONMENT
  • MOLECULAR LINE SURVEY
  • INFRARED GALAXIES
  • NEARBY GALAXIES
  • STAR-FORMATION
  • (CO)-C-13
  • EMISSION
  • MERGERS
  • RATIO
  • NUCLEOSYNTHESIS

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