2021MNRAS.503.4320F

Query : 2021MNRAS.503.4320F

2021MNRAS.503.4320F - Mon. Not. R. Astron. Soc., 503, 4320-4335 (2021/May-3)

ALMA-IRDC - II. First high-angular resolution measurements of the 14N/15N ratio in a large sample of infrared-dark cloud cores.

FONTANI F., BARNES A.T., CASELLI P., HENSHAW J.D., COSENTINO G., JIMENEZ-SERRA I., TAN J.C., PINEDA J.E. and LAW C.Y.

Abstract (from CDS):

The 14N/15N ratio in molecules exhibits a large variation in star-forming regions, especially when measured from N2H+ isotopologues. However, there are only a few studies performed at high-angular resolution. We present the first interferometric survey of the 14N/15N ratio in N2H+ obtained with Atacama Large Millimeter Array observations towards four infrared-dark clouds harbouring 3 mm continuum cores associated with different physical properties. We detect N15NH+ (1-0) in ∼20-40 per cent of the cores, depending on the host cloud. The 14N/15N values measured towards the millimetre continuum cores range from a minimum of ∼80 up to a maximum of ∼400. The spread of values is narrower than that found in any previous single-dish survey of high-mass star-forming regions and than that obtained using the total power data only. This suggests that the 14N/15N ratio is on average higher in the diffuse gaseous envelope of the cores and stresses the need for high-angular resolution maps to measure correctly the 14N/15N ratio in dense cores embedded in IRDCs. The average 14N/15N ratio of ∼210 is also lower than the interstellar value at the Galactocentric distance of the clouds (∼300-330), although the sensitivity of our observations does not allow us to unveil 14N/15N ratios higher than ∼400. No clear trend is found between the 14N/15N ratio and the core physical properties. We find only a tentative positive trend between 14N/15N and H2 column density. However, firmer conclusions can be drawn only with higher sensitivity measurements.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): stars: formation - ISM: clouds - ISM: molecules

Simbad objects: 83

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Number of rows : 83
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 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 965 0
2 V* V2457 Ori Or* 05 35 26.97000 -05 09 54.4644         18.858 ~ 166 0
3 IRAS 05358+3543 Y*O 05 39 09.92 +35 45 17.2           ~ 171 0
4 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 2144 1
5 [BHF2021] C1c2 cor 18 42 44.55962088 -04 04 04.7181356           ~ 2 0
6 [BHF2021] C1c1 cor 18 42 46.45848326 -04 04 15.0467555           ~ 2 0
7 [TKB2013] C1-N cor 18 42 46.89 -04 04 06.3           ~ 14 0
8 [BHF2021] C1c3 cor 18 42 47.37562093 -04 03 50.3240306           ~ 2 0
9 [BHF2021] C2c1 cor 18 42 49.85562773 -04 03 25.4233293           ~ 3 0
10 [BHF2021] C2c2 cor 18 42 50.31500034 -04 03 20.8567709           ~ 3 0
11 [KTC2017] C2C cor 18 42 50.37 -04 03 20.0           ~ 2 0
12 NAME Dragon Nebula DNe 18 42 50.6 -04 03 30           ~ 177 0
13 [BHF2021] C2c3/5 cor 18 42 50.60239872 -04 03 16.3986358           ~ 3 0
14 [BHF2021] C2c4 cor 18 42 50.81762373 -04 03 11.5047166           ~ 2 0
15 [KTC2017] C2A cor 18 42 50.97 -04 03 13.3           ~ 2 0
16 [KTC2017] C2B cor 18 42 50.98 -04 03 10.0           ~ 2 0
17 [BHF2021] C2c6 cor 18 42 51.18297694 -04 03 06.7282660           ~ 3 0
18 [KTC2017] C5A cor 18 42 52.26 -04 02 45.8           ~ 2 0
19 [BHF2021] C5c1/2 cor 18 42 52.52715065 -04 02 40.2952582           ~ 2 0
20 [BHF2021] C5c3/4 cor 18 42 52.73583663 -04 02 45.8624859           ~ 2 0
21 [BHF2021] C6c9 cor 18 42 53.75757324 -04 02 16.6505208           ~ 2 0
22 [BHF2021] C6c5 cor 18 42 54.00761394 -04 02 36.0498279           ~ 2 0
23 [BHF2021] C6c1/2 cor 18 42 54.04587673 -04 02 28.0323504           ~ 2 0
24 [BHF2021] C6c6/8 cor 18 42 54.17967369 -04 02 32.9287205           ~ 2 0
25 [BHF2021] C6c7 cor 18 42 54.54151173 -04 02 21.7092818           ~ 2 0
26 [BHF2021] C6c10 cor 18 42 54.86176183 -04 02 12.5587017           ~ 2 0
27 [BHF2021] D3c3/4 cor 18 44 15.52493713 -04 00 58.9000116           ~ 2 0
28 [BHF2021] D5c7 cor 18 44 16.30232934 -03 59 39.7458382           ~ 2 1
29 [BHF2021] D3c5 cor 18 44 16.40432581 -04 00 32.3970210           ~ 2 0
30 [BHF2021] D5c1 cor 18 44 16.74741163 -03 59 17.3747292           ~ 2 0
31 MSXDC G028.53-00.25 DNe 18 44 17.1 -03 59 37           ~ 24 0
32 [BHF2021] D5c3 cor 18 44 17.36022661 -03 59 22.4337109           ~ 2 0
33 [BHF2021] D6c1/2/3 cor 18 44 17.40355459 -04 00 08.5312957           ~ 2 0
34 [BHF2021] D5c5/6 cor 18 44 17.84279318 -03 59 33.8147647           ~ 2 0
35 [BHF2021] D7c1 cor 18 44 17.85564096 -03 59 45.3031025           ~ 2 0
36 [BHF2021] D8c1 cor 18 44 18.04258047 -03 59 22.0202275           ~ 2 0
37 [BHF2021] D6c4 cor 18 44 18.19005853 -04 00 01.5730289           ~ 2 0
38 [BHF2021] D7c2 cor 18 44 18.26045389 -03 59 42.8182449           ~ 2 0
39 [BHF2021] D7c3 cor 18 44 18.36575360 -03 59 27.5523267           ~ 2 0
40 [BHF2021] D6c6 cor 18 44 18.56057389 -03 59 50.4842288           ~ 2 0
41 [BHF2021] D6c5 cor 18 44 18.95351951 -03 59 48.9218709           ~ 2 0
42 [BHF2021] D9c1/2 cor 18 44 19.21414035 -03 58 08.4100985           ~ 2 0
43 [BHF2021] F1c5 cor 18 53 16.52768399 +01 26 21.8172908           ~ 2 0
44 [BHF2021] F1c6 cor 18 53 16.87940950 +01 26 30.6240650           ~ 2 0
45 [BHF2021] F2c1 cor 18 53 17.93279719 +01 27 20.2818153           ~ 2 0
46 [BHF2021] F2c2 cor 18 53 18.01509403 +01 27 14.1349845           ~ 2 0
47 [BHF2021] F1c1 cor 18 53 18.04556735 +01 25 26.1040932           ~ 2 0
48 [BHF2021] F4c1 cor 18 53 18.16933736 +01 28 40.6555983           ~ 2 0
49 [BHF2021] F3c5 cor 18 53 18.18131845 +01 27 28.0082794           ~ 2 0
50 [BHF2021] F1c2 cor 18 53 18.29111029 +01 25 38.5453314           ~ 2 0
51 [BHF2021] F3c1/2 cor 18 53 18.36683192 +01 27 35.3296452           ~ 2 0
52 [BHF2021] F1c3 cor 18 53 18.65860587 +01 25 37.8189188           ~ 2 0
53 [BHF2021] F1c4 cor 18 53 18.70495930 +01 25 47.1150160           ~ 2 0
54 [BHF2021] F3c4 cor 18 53 18.80296200 +01 27 58.6865006           ~ 2 0
55 MSXDC G034.43+00.24 MoC 18 53 18.9 +01 26 39           ~ 122 0
56 [BHF2021] F3c3 cor 18 53 19.05121981 +01 27 48.4144768           ~ 2 0
57 [BHF2021] F4c5 cor 18 53 19.83348676 +01 28 11.1023023           ~ 2 0
58 [BHF2021] F4c9 cor 18 53 20.10305939 +01 28 26.2717518           ~ 2 0
59 [BHF2021] F4c6 cor 18 53 20.17021784 +01 28 14.1376816           ~ 2 0
60 [BHF2021] F4c4 cor 18 53 20.29277936 +01 28 08.1293051           ~ 2 0
61 [BHF2021] F4c10 cor 18 53 20.42819278 +01 28 37.7221039           ~ 2 0
62 [BHF2021] F4c7 cor 18 53 20.51789701 +01 28 20.1732545           ~ 2 0
63 [BHF2021] F4c8 cor 18 53 20.60950937 +01 28 25.7289416           ~ 2 0
64 [KTC2017] H2G cor 18 57 06.53 +02 08 27.3           ~ 2 0
65 [BHF2021] H4c1 cor 18 57 06.57586932 +02 08 32.7516655           ~ 2 0
66 [KTC2017] H2D cor 18 57 06.65 +02 08 23.0           ~ 2 0
67 [KTC2017] H2E cor 18 57 06.71 +02 08 31.7           ~ 2 0
68 [KTC2017] H2A cor 18 57 06.82 +02 08 19.5           ~ 2 0
69 [BHF2021] H2c1 cor 18 57 07.19943705 +02 08 21.4344831           ~ 2 0
70 [KTC2017] H2B cor 18 57 07.23 +02 08 22.2           ~ 2 0
71 [KTC2017] H2C cor 18 57 07.26 +02 08 19.4           ~ 2 0
72 [BHF2021] H5c1 cor 18 57 08.29891608 +02 09 04.8892420           ~ 2 0
73 [KTC2017] H5A cor 18 57 08.31 +02 09 03.1           ~ 2 0
74 [BHF2021] H3c6 cor 18 57 08.59891351 +02 08 06.1919604           ~ 2 0
75 [BHF2021] H5c3 cor 18 57 08.60829178 +02 09 01.3634394           ~ 2 0
76 [BHF2021] H3c1 cor 18 57 08.69659610 +02 08 30.8087120           ~ 2 0
77 MSXDC G035.39-00.33 MoC 18 57 09.0 +02 07 46           ~ 132 0
78 [BHF2021] H3c2 cor 18 57 09.11007660 +02 08 27.8782155           ~ 2 0
79 [KTC2017] H3A cor 18 57 09.14 +02 08 30.0           ~ 2 0
80 [BHF2021] H3c3 cor 18 57 09.14496539 +02 08 20.8230245           ~ 2 0
81 [BHF2021] H3c5 cor 18 57 09.14750825 +02 07 56.1932289           ~ 2 0
82 [BHF2021] H3c4 cor 18 57 09.42917809 +02 07 52.0917011           ~ 2 0
83 [KTC2017] H1A cor 18 57 10.88 +02 07 32.4           ~ 2 0

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