2019A&A...625A.101B


Query : 2019A&A...625A.101B

2019A&A...625A.101B - Astronomy and Astrophysics, volume 625A, 101-101 (2019/5-1)

A new radio molecular line survey of planetary nebulae. HNC/HCN as a diagnostic of ultraviolet irradiation.

BUBLITZ J., KASTNER J.H., SANTANDER-GARCIA M., BUJARRABAL V., ALCOLEA J. and MONTEZ R.

Abstract (from CDS):

Certain planetary nebulae (PNe) contain shells, filaments, or globules of cold gas and dust whose heating and chemistry are likely driven by UV and X-ray emission from their central stars and from wind-collision-generated shocks. We present the results of a survey of molecular line emission in the 88-236GHz range from nine nearby (<1.5kpc) planetary nebulae spanning a range of UV and X-ray luminosities, using the 30m telescope of the Institut de Radioastronomie Millimetrique. Rotational transitions of thirteen molecules, including CO isotopologues and chemically important trace species, were observed and the results compared with and augmented by previous studies of molecular gas in PNe. Lines of the molecules HCO+, HNC, HCN, and CN, which were detected in most objects, represent new detections for four planetary nebulae in our study. Specifically, we present the first detections of 13CO (1-0, 2-1), HCO+, CN, HCN, and HNC in NGC 6445; HCO+ in BD+30°3639; 13CO (2-1), CN, HCN, and HNC in NGC 6853; and 13CO (2-1) and CN in NGC 6772. Flux ratios were analyzed to identify correlations between the central star and/or nebular UV and X-ray luminosities and the molecular chemistries of the nebulae. This analysis reveals a surprisingly robust dependence of the HNC/HCN line ratio on PN central star UV luminosity. There exists no such clear correlation between PN X-rays and various diagnostics of PN molecular chemistry. The correlation between HNC/HCN ratio and central star UV luminosity demonstrates the potential of molecular emission line studies of PNe for improving our understanding of the role that high-energy radiation plays in the heating and chemistry of photodissociation regions.

Abstract Copyright: © J. Bublitz et al. 2019

Journal keyword(s): astrochemistry - ISM: molecules - planetary nebulae: general - radio lines: ISM

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1113 2
2 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1001 1
3 PN M 1-7 PN 06 37 20.966 +24 00 36.56           ~ 111 0
4 NGC 2346 PN 07 09 22.5215800440 -00 48 23.610997332   11.76 11.58     A5V 564 0
5 NGC 2440 PN 07 41 54.91 -18 12 29.7   18.9       ~ 642 2
6 QSO J0854+2006 BLL 08 54 48.8749846272 +20 06 30.639583620   15.91 15.43 15.56   ~ 2182 1
7 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2247 0
8 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 1751 1
9 QSO B1730-130 QSO 17 33 02.7055087032 -13 04 49.545516612   18 18.5 18.78 17.39 ~ 1068 1
10 PN Hb 5 PN 17 47 56.20 -29 59 39.6   10.50 10.78     ~ 261 0
11 NGC 6445 PN 17 49 15.21 -20 00 34.5   18.9       ~ 289 0
12 M 57 PN 18 53 35.0967659112 +33 01 44.883287544   15.405 15.769 15.901 16.062 DA(O?) 815 2
13 NGC 6772 PN 19 14 36.373 -02 42 25.04   17.01       ~ 146 0
14 NGC 6781 PN 19 18 28.085 +06 32 19.29     11.8     ~ 257 0
15 HD 184738 PN 19 34 45.2337620448 +30 30 58.950651240   10.41 10.44     [WC9] 936 0
16 M 27 PN 19 59 36.3631850088 +22 43 16.312059552   13.749 14.089 14.247 14.405 DAO.6 580 0
17 NAME K 3-50A HII 20 01 45.6 +33 32 42           ~ 78 0
18 NGC 7008 PN 21 00 32.817600 +54 32 35.37600       13.21   ~ 237 1
19 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2407 1
20 NGC 7293 PN 22 29 38.5454047152 -20 50 13.747242408 11.894 13.158 13.524 13.689 13.898 DAO.5 926 0

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2022.08.18-16:58:16

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