VizieR Online Data Catalog: ATOMS Paper III, massive star-forming regions (Liu+, 2021)

With the ATOMS survey data (same as see Paper I 2020MNRAS.496.2790L, Cat. J/MNRAS/496/2790 and Paper II 2020MNRAS.496.2821L, Cat. J/MNRAS/496/2821) , in this paper we aim to establish catalogues of a large sample of both candidate HMCs and H/UC-H II regions as a crucial foundation for future studies for the early stages of high-mass star formation. The ATOMS survey targeted a large sample of 146 IRAS clumps (Bronfman, Nyman & May 1996A&AS..115...81B, Cat. J/A+AS/115/81; Liu et al. 2016ApJ...829...59L ). (please see section 2 alma observations for mere details).

The ACA and 12 m array data were calibrated and imaged separately with the casa software package version 5.6 (McMullin et al. 2007 ASP Conf. Ser. Vol. 376, Astronomical Data Analysis Software and Systems XVI. Astron. Soc. Pac, San Francisco, p. 127). More details on the data reduction can be found in Paper I (Liu T.et al. 2020MNRAS.496.2790L, Cat. J/MNRAS/496/2790) and Paper II (Liu T. et al. 2020MNRAS.496.2821L, Cat. J/MNRAS/496/2821). To extract compact cores (observational and physical properties) from the 3 mm continuum maps, we make use of both the Dendrogram algorithm and casaimfit function. As a result, we finally obtained 453 cores from the 146 ATOMS target clumps.

Hereafter, we search for candidate HMCs and H/UC-HII cores. The advantage of the ATOMS survey strategy is that the two wide SPWs 7 and 8 cover many transitions of the COMs (i.e. HMC tracers) and the H40α transition (the ionized gas tracer).

If the H40α emission appears compact and is spatially associated with the compact continuum core, the core will be classified as an H/UC-HII core. Following this rule, we finally obtain 91 H/UC-HII cores. Their parameters determined are given in table1.dat.

To quantitatively describe the chemical richness of a core, we use the number of lines (Nline). These spectral windows cover tens of transitions from COMs (e.g. CH3OCHO, CH3CHO, CH3OH, C2H5CN) that are usually detectable in an HMC, and only two or three transitions of non-HMC-tracer molecules (i.e. CS (2-1), SO (3-2) or H2CO. Counting the emission lines is therefore useful in a search for the COM-containing cores.

Following the above criteria, 138 COM-containing cores were selected. However we only exhibit COM-containing cores without H/UC-H II spectral signatures. Thus, the table2.dat refers to 31 pure strong cores with Nline >= 20 while the table3.dat represents 51 pure weak cores with 5 <= Nline <= 20.

Finally, the remaining 280 cores lack observationally quantifiable metrics for association into any of the three categories above. Hence, we refer to these as 'unknown cores' as their properties are shown in the table4.dat (see section 3.3 for more details).

(4 data files).