Extreme CO Isotopic Abundances in the ULIRG IRAS 13120-5453: An Extremely Young Starburst or Top-heavy Initial Mass Function
Artikel i vetenskaplig tidskrift, 2017

We present ALMA 12CO (J = 1-0, 3-2 and 6-5), 13CO (J = 1-0), and C18O (J = 1-0) observations of the local ultraluminous infrared galaxy (ULIRG) IRAS 13120-5453. The morphologies of the three isotopic species differ, as 13CO shows a hole in emission toward the center. We measure integrated brightness temperature line ratios of 12CO/13CO ? 60 (exceeding 200) and 13CO/C18O ? 1 in the central region. Assuming optical thin emission, C18O is more abundant than 13CO in several regions. The abundances within the central 500 pc are consistent with the enrichment of the interstellar medium via a young starburst (>7 Myr), a top-heavy initial mass function, or a combination of both.

galaxies: interactions

galaxies: individual (IRAS 13120-5453)

radiative transfer

galaxies: starburst

submillimeter: galaxies

galaxies: abundances


Kazimierz Sliwa

MPI for Astronomy

Christine D. Wilson

McMaster University, Faculty of Science

Susanne Aalto

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

G. Privon

Universidad de Concepción

Pontificia Universidad Catolica de Chile

Astrophysical Journal Letters

2041-8205 (ISSN) 2041-8213 (eISSN)

Vol. 840 L11


Astronomi, astrofysik och kosmologi


Grundläggande vetenskaper


Onsala rymdobservatorium