2014A&A...563L...6M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST06:30:51

2014A&A...563L...6M - Astronomy and Astrophysics, volume 563, L6-6 (2014/3-1)

Chemistry in isolation: High CCH/HCO+ line ratio in the AMIGA galaxy CIG 638.

MARTIN S., VERDES-MONTENEGRO L., ALADRO R., ESPADA D., ARGUDO-FERNANDEZ M., KRAMER C. and SCOTT T.C.

Abstract (from CDS):

Multi-molecule observations towards an increasing variety of galaxies have been showing that the relative molecular abundances are affected by the type of activity. However, these studies are biased towards bright active galaxies, which are typically in interaction. We study the molecular composition of one of the most isolated galaxies in the local Universe where the physical and chemical properties of their molecular clouds have been determined by intrinsic mechanisms. We present 3mm broad band observations of the galaxy CIG 638, extracted from the AMIGA sample of isolated galaxies. The emission of the J=1-0 transitions of CCH, HCN, HCO+, and HNC are detected. Integrated intensity ratios between these line are compared with similar observations from the literature towards active galaxies including starburst galaxies (SB), active galactic nuclei, luminous infrared galaxies (LIRG), and GMCs in M33. A significantly high ratio of CCH with respect to HCN, HCO+, and HNC is found towards CIG 638 when compared with all other galaxies where these species have been detected. This points to either an overabundance of CCH or to a relative lack of dense molecular gas as supported by the low HCN/CO ratio, or both. The data suggest that the CIG 638 is naturally a less perturbed galaxy where a lower fraction of dense molecular gas, as well as a more even distribution could explain the measured ratios. In this scenario the dense gas tracers would be naturally dimmer, while the UV enhanced CCH, would be overproduced in a less shielded medium.

Abstract Copyright:

Journal keyword(s): galaxies: individual: CIG 638 - astrochemistry - ISM: abundances - ISM: molecules - galaxies: ISM

VizieR on-line data: <Available at CDS (J/A+A/563/L6): list.dat sp/*>

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2931 2
2 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5135 1
3 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4093 2
4 UGC 2866 GiG 03 50 15.0017250839 +70 05 40.331792502   15.5       ~ 66 1
5 UGC 5101 Sy1 09 35 51.694 +61 21 10.52   15.20 15.50     ~ 503 4
6 M 108 SBG 11 11 30.967 +55 40 26.84   10.70       ~ 411 1
7 NGC 3690 IG 11 28 31.326 +58 33 41.80   13.19 12.86     ~ 883 4
8 NGC 4194 AGN 12 14 09.615 +54 31 35.93   13.79 13.30     ~ 409 2
9 IC 860 LIN 13 15 03.51 +24 37 07.8   14.8       ~ 179 0
10 NGC 5690 GiG 14 37 41.0621949635 +02 17 27.095213875   13.10       ~ 145 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-06:30:51

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