2015A&A...576A..45F


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.19CEST05:38:14

2015A&A...576A..45F - Astronomy and Astrophysics, volume 576A, 45-45 (2015/4-1)

Complex organic molecules in organic-poor massive young stellar objects.

FAYOLLE E.C., OEBERG K.I., GARROD R.T., VAN DISHOECK E.F. and BISSCHOP S.E.

Abstract (from CDS):

Massive young stellar objects (MYSOs) with hot cores are classic sources of complex organic molecules. The origins of these molecules in such sources, as well as the small- and large-scale differentiation between nitrogen- and oxygen-bearing complex species, are poorly understood. We aim to use complex molecule abundances toward a chemically less explored class of MYSOs with weak hot organic emission lines to constrain the impact of hot molecular cores and initial ice conditions on the chemical composition toward MYSOs. We use the IRAM 30m and the Submillimeter Array to search for complex organic molecules over 8-16GHz in the 1 mm atmospheric window toward three MYSOs with known ice abundances, but without luminous molecular hot cores. Complex molecules are detected toward all three sources at comparable abundances with respect to CH3OH to classical hot core sources. The relative importance of CH3CHO, CH3CCH, CH3OCH3, CH3CN, and HNCO differ between the organic-poor MYSOs and hot cores, however. Furthermore, the N-bearing molecules are generally concentrated toward the source centers, while most O- and C-bearing molecules are present both in the center and in the colder envelope. Gas-phase HNCO/CH3OH ratios are tentatively correlated with the ratios of NH3 ice over CH3OH ice in the same lines of sight, which is consistent with new gas-grain model predictions. Hot cores are not required to form complex organic molecules, and source temperature and initial ice composition both seem to affect complex organic distributions toward MYSOs. To quantify the relative impact of temperature and initial conditions requires, however, a larger spatially resolved survey of MYSOs with ice detections.

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: molecules - astrochemistry

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 - 2019
#notes
1 4C 60.01 Rad 00 14 48.79215207 +61 17 43.5420962           ~ 24 1
2 7C 0059+5808 QSO 01 02 45.76238248 +58 24 11.1366009   20.09 19.22 18.57 17.90 ~ 179 1
3 NAME W3 IRS 5 Y*O 02 25 40.54 +62 05 51.4           B1 322 0
4 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 942 3
5 ICRF J024457.6+622806 Sy1 02 44 57.6968650655 +62 28 06.517178768   12.15 12.19     ~ 245 1
6 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3460 3
7 RAFGL 490 Y*O 03 27 38.7928323987 +58 47 00.017662871           ~ 334 0
8 Ass Cam OB 1 As* 03 31.6 +58 38           ~ 85 0
9 4C 50.11 QSO 03 59 29.74726473 +50 57 50.1615765           ~ 388 1
10 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 559 1
11 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2634 2
12 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 200 1
13 W 33a Y*O 18 14 39.0 -17 52 03           ~ 570 0
14 [FCC2002] A1 Y*O 18 36 12.6 -07 12 11           ~ 27 0
15 NAME Cygnus 2N HII 20 21 44.1 +37 26 40           ~ 106 1
16 RAFGL 2591 Y*O 20 29 25.2650 +40 11 26.532   18       ~ 562 5
17 3C 454.3 QSO 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2439 2
18 NGC 7538 OpC 23 13 37 +61 30.0           ~ 814 0
19 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 359 3
20 [WBN74] NGC 7538 IRS 9 Y*O 23 14 01.63 +61 27 20.2           ~ 336 0

    Equat.    Gal    SGal    Ecl

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2019.10.19-05:38:14

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