VizieR Online Data Catalog: HC3N & N2H+ obs. toward 61 ultracompact HII regions (Wang+, 2023)

The observations of the HC₃N (J=10-9 and 16-15) and N₂/S lines were carried out toward our 61 ultracompact (UC) HII region sample with the Institut de Radioastronomie Millimetrique (IRAM) 30m telescope during 2020 August 18-24 within project 022-20 (PI Hongzhi Yu). The Eight Mixer Receiver (EMIR) heterodyne receivers (E090 and E150) were employed covering the frequency ranges of 90.5-98.2GHz and 138.3-146GHz.

Toward those 49 sources with detections of both HC₃N lines (J=10-9 and 16-15) lines by the IRAM 30m telescope, we performed complementary observations on their HC₃N J=12-11 line in 2021 May, using the Arizona Radio Observatory (ARO) 12m telescope (Yu_20A1, PI, Hongzhi Yu).

Using the N₂H⁺ (J=1-0) data of the Nobeyama 45m telescope with a beam size of 17" in high-mass starless cores (HMSCs) and high-mass protostellar cores (HMPOs) from Taniguchi+ (2019ApJ...872..154T), and following the procedure and equations in Section 3.3.2, we recalculated N(N₂H⁺) of HMSCs and HMPOs (see details in Table 7 and Section 4.1).

(6 data files).