2018A&A...609A.121M


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.20CET03:32:15

2018A&A...609A.121M - Astronomy and Astrophysics, volume 609A, 121-121 (2018/1-1)

Laboratory measurements and astronomical search for cyanomethanimine.

MELOSSO M., MELLI A., PUZZARINI C., CODELLA C., SPADA L., DORE L., DEGLI ESPOSTI C., LEFLOCH B., BACHILLER R., CECCARELLI C., CERNICHARO J. and BARONE V.

Abstract (from CDS):

Context. C-cyanomethanimine (HNCHCN), existing in the two Z and E isomeric forms, is a key prebiotic molecule, but, so far, only the E isomer has been detected toward the massive star-forming region Sagittarius B2(N) using transitions in the radio wavelength domain.
Aims. With the aim of detecting HNCHCN in Sun-like-star forming regions, the laboratory investigation of its rotational spectrum has been extended to the millimeter-/submillimeter-wave (mm-/submm-) spectral window in which several unbiased spectral surveys have been already carried out.
Methods. High-resolution laboratory measurements of the rotational spectrum of C-cyanomethanimine were carried out in the 100-420GHz range using a frequency-modulation absorption spectrometer. We then searched for the C-cyanomethanimine spectral features in the mm-wave range using the high-sensitivity and unbiased spectral surveys obtained with the IRAM 30-m antenna in the ASAI context, the earliest stages of star formation from starless to evolved Class I objects being sampled.
Results. For both the Z and E isomers, the spectroscopic work has led to an improved and extended knowledge of the spectroscopic parameters, thus providing accurate predictions of the rotational signatures up to ∼700GHz. So far, no C-cyanomethanimine emission has been detected toward the ASAI targets, and upper limits of the column density of ∼1011-1012 cm–2 could only be derived. Consequently, the C-cyanomethanimine abundances have to be less than a few 10–10 for starless and hot-corinos. A less stringent constraint, ≤10–9, is obtained for shocks sites.
Conclusions. The combination of the upper limits of the abundances of C-cyanomethanimine together with accurate laboratory frequencies up to ∼700GHz poses the basis for future higher sensitivity searches around Sun-like-star forming regions. For compact (typically less than 1'') and chemically enriched sources such as hot-corinos, the use of interferometers as NOEMA and ALMA in their extended configurations are clearly needed.

Abstract Copyright: © ESO, 2018

Journal keyword(s): ISM: molecules - molecular data - methods: data analysis - methods: laboratory: molecular

VizieR on-line data: <Available at CDS (J/A+A/609/A121): table2.dat>

Simbad objects: 25

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Number of rows : 25

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 LDN 1448 DNe 03 22.5 +30 35           ~ 463 0
2 NGC 1333 SFR 03 28 55 +31 22.2   10.9       ~ 1200 1
3 NAME HH 7-11 FIR 03 29 03.9 +31 16 06           ~ 332 0
4 [JCC87] IRAS 4A2 Y*O 03 29 10.413 +31 13 32.20           ~ 76 1
5 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 576 1
6 [JCC87] IRAS 4A1 Y*O 03 29 10.510 +31 13 31.01           ~ 68 1
7 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 462 0
8 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 252 0
9 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 152 0
10 [HRF2005] 3 PoC 03 33 21.3 +31 07 27           ~ 57 0
11 [KJD2006] SMM J033335+31075 PoC 03 33 21.3 +31 07 28           ~ 69 0
12 LDN 1527 DNe 04 39 53 +25 45.0           ~ 478 0
13 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3374 0
14 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 663 0
15 V* FU Dra EB* 15 34 45.2141461351 +62 16 44.330023737       10.1   G0: 116 1
16 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1013 1
17 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11251 0
18 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 504 1
19 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1879 1
20 [TB95] R2 red 20 38 55 +68 05.0           ~ 9 0
21 NAME LDN 1157-mm Y*O 20 39 06.2 +68 02 15           ~ 155 0
22 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 472 0
23 [DE95] LDN 1157 B2 out 20 39 09.3 +68 00 44           ~ 56 0
24 [DE95] LDN 1157 B1 out 20 39 11 +68 01.3           ~ 170 0
25 LDN 1154 DNe 22 16.8 +56 13           ~ 5 0

    Equat.    Gal    SGal    Ecl

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2020.02.20-03:32:15

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