2022A&A...667A.151C

Query : 2022A&A...667A.151C

2022A&A...667A.151C - Astronomy and Astrophysics, volume 667A151 (2022/11-1)

CHEMOUT: CHEMical complexity in star-forming regions of the OUTer Galaxy III. Nitrogen isotopic ratios in the outer Galaxy.

COLZI L., ROMANO D., FONTANI F., RIVILLA V.M., BIZZOCCHI L., BELTRAN M.T., CASELLI P., ELIA D. and MAGRINI L.

Abstract (from CDS):



em Context. Nitrogen isotopic ratios are a key tool for tracing Galactic stellar nucleosynthesis.

em Aims. We present the first study of the 14N/15N abundance ratio in the outer regions of the Milky Way (namely, for galactocentric distances, RGC, from 12 up to 19 kpc), with the aim to study the stellar nucleosynthesis effects in the global Galactic trend. Methods. We analysed IRAM 30 m observations towards a sample of 35 sources in the context of the CHEMical complexity in star-forming regions of the OUTer Galaxy (CHEMOUT) project. We derived the 14N/15N ratios from HCN and HNC for 14 and 3 sources, respectively, using the J = 1-0 rotational transition of HN13C, H15NC, H13CN, and HC15N.

em Results. The results found in the outer Galaxy have been combined with previous measurements obtained in the inner Galaxy. We find an overall linear decreasing H13CN/HC15N ratio with increasing RGC. This translates to a parabolic 14N/15N ratio with a peak at 11 kpc. Updated Galactic chemical evolution models have been taken into account and compared with the observations. The parabolic trend of the 14N/15N ratio with RGC can be naturally explained (i) by a model that assumes novae as the main 15N producers on long timescales (≥1 Gyr) and (ii) by updated stellar yields for low- and intermediate-mass stars.

Abstract Copyright: © L. Colzi et al. 2022

Journal keyword(s): Galaxy: abundances - Galaxy: evolution - local insterstellar matter - ISM: abundances - ISM: molecules - radio lines: ISM

Simbad objects: 37

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Number of rows : 37
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 IRAS 00032+6348 IR 00 05 53.529 +64 05 15.06           ~ 12 0
2 IRAS 01037+6504 IR 01 06 59.7 +65 20 53           ~ 14 0
3 GAL 124.64+02.54 HII 01 07 50.70 +65 21 21.4           ~ 52 0
4 IRAS 01160+6529 IR 01 19 26.5393580496 +65 45 45.024636924           ~ 29 0
5 IRAS 01420+6401 HII 01 45 40.16013 +64 16 09.0770           ~ 32 1
6 RAFGL 5077 HII 02 43 28.62213 +62 57 08.7770           ~ 77 0
7 IRAS 02421+6233 HII 02 46 07.09656 +62 46 30.4248           ~ 20 0
8 CPM 9 Y*O 03 52 27.53 +57 48 33.1           ~ 19 0
9 2MASX J04062549+5321492 G 04 06 25.4523305280 +53 21 49.323364236           ~ 16 0
10 LEDA 3094741 AG? 04 35 58.865 +47 43 03.42           ~ 12 0
11 IRAS 05137+3919 Cld 05 17 13.3 +39 22 14           ~ 75 0
12 2MASX J05254062+4141530 G 05 25 40.6555806696 +41 41 53.115773928           ~ 24 0
13 IRAS 05343+3605 IR 05 37 41.8 +36 07 21           ~ 13 0
14 IRAS 05444+3520 MIR 05 47 45.10104 +35 21 59.1660           ~ 11 0
15 JCMTSF J061724.0+145444 Cl* 06 17 24.30 +14 54 37.2           ~ 31 0
16 GAL 195.82-00.21 HII 06 18 40.25 +15 05 14.2           ~ 19 0
17 2MASX J06503736-0521006 G 06 50 37.3785742608 -05 20 59.774465616           ~ 18 0
18 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
19 NVSS J194022+271832 Rad 19 40 22.15 +27 18 32.8   15.0       ~ 6 1
20 HRDS G061.720+00.864 HII 19 44 23.489 +25 48 41.55           ~ 20 1
21 [BNM96] 066.609+2.060 HII 19 50 53.0583347736 +30 38 10.310744400           ~ 6 0
22 IRAS 19571+3113 HII 19 59 07.6 +31 21 02           ~ 12 0
23 IRAS 20243+3853 HII 20 26 11.61 +39 03 32.8           ~ 18 0
24 IRAS 20357+4703 IR 20 37 22.2 +47 13 53           ~ 9 0
25 IRAS 20413+4724 MIR 20 42 58.28976 +47 35 31.9632           ~ 8 0
26 IRAS 20505+4940 MIR 20 52 07.39032 +49 51 28.9980           ~ 7 0
27 IRAS 21025+4641 IR 21 04 17.9 +46 53 11           ~ 7 0
28 IRAS 21036+4903 IR 21 05 19.6 +49 15 59           ~ 8 0
29 IRAS 21051+4950 IR 21 06 49.9 +50 02 09           ~ 7 0
30 IRAS 21144+5430 HII 21 15 55.636 +54 43 31.01           ~ 28 0
31 IRAS 21228+5332 IR 21 24 29.0 +53 45 34           ~ 13 0
32 IRAS 21248+5331 IR 21 26 28.9 +53 44 11           ~ 9 0
33 AKARI-IRC-V1 J2127477+542657 HII 21 27 47.86416 +54 26 58.5888           ~ 9 0
34 IRAS 22036+6034 MIR 22 05 14.85816 +60 48 40.0104           ~ 11 0
35 IRAS 23301+6316 IR 23 32 23.511 +63 33 19.14           ~ 15 0
36 IRAS 23338+6207 LP? 23 36 08.1704265720 +62 23 46.510545660           ~ 11 0
37 NAME Galactic Bar reg ~ ~           ~ 1458 0

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