2008A&A...489..157L


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET18:20:57

2008A&A...489..157L - Astronomy and Astrophysics, volume 489, 157-171 (2008/10-1)

Star formation in the Trifid Nebula. Cores and filaments.

LEFLOCH B., CERNICHARO J. and PARDO J.R.

Abstract (from CDS):

We aim to characterize the properties of the prestellar and protostellar condensations to understand the star formation processes at work in a young HII region We have obtained maps of the 1.25 mm thermal dust emission and the molecular gas emission over a region of 20'x10 ' around the Trifid Nebula (M20), with the IRAM 30 m and the CSO telescopes as well as in the mid-infrared wavelength with ISO and SPITZER. Our survey is sensitive to features down to N(H2) ∼1022cm–2 in column density. The cloud material is distributed in fragmented dense gas filaments (n(H2) of a few 103cm–3) with sizes ranging from 1 to 10pc. A massive filament, WF, with properties typical of Infra Red Dark Clouds, connects M20 to the W28 supernova remnant. We find that these filaments pre-exist the formation of the Trifid and were originally self-gravitating. The fragments produced are very massive (typically 100M or more) and are the progenitors of the cometary globules observed at the border of the HII region. We could identify 33 cores, 16 of which are currently forming stars. Most of the starless cores have typical H2 densities of a few 104cm–3. They are usually gravitationally unbound and have low masses of a few M. The densest starless cores (several 105cm–3) are located in condensation TC0, currently hit by the ionization front, and may be the site for the next generation of stars. The physical gas and dust properties of the cometary globules have been studied in detail and have been found very similar. They all are forming stars. Several intermediate-mass protostars have been detected in the cometary globules and in the deeply embedded cores. Evidence of clustering has been found in the shocked massive cores TC3-TC4-TC5. M20 is a good example of massive-star forming region in a turbulent, filamentary molecular cloud. Photoionization appears to play a minor role in the formation of the cores. The observed fragmentation is well explained by MHD-driven instabilities and is usually not related to M20. We propose that the nearby supernova remnant W28 could have triggered the formation of protostellar clusters in nearby dense cores of the Trifid.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: clouds - HII regions - Herbig-Haro objects - dust, extinction

Nomenclature: Fig.1, Table 2: [LCP2008] WF N=1, [LCP2008] WL (Nos EL, WL, SL). Fig.1, Table 3: [CLC98] TCNNa (Nos TC00, TC0a-TC0d, TC3a-TC3c,TC 4a, TC4f, TC5-TC17, TC6a-TC6d)

CDS comments: Paragraph. 2.1 HD 164429A is a misprint for HD 164492A.

Simbad objects: 54

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Number of rows : 54

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1121 2
2 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 969 3
3 NAME Heart Nebula HII 02 32.7 +61 27           ~ 287 1
4 IC 1848 OpC 02 51 06 +60 24.6   6.87 6.5     ~ 451 2
5 Ass Per OB 2 As* 03 42.2 +33 26           ~ 313 0
6 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 499 0
7 NAME Rosette Nebula HII 06 32 26.76 +04 47 37.1           ~ 456 1
8 SNR G006.4-00.1 SNR 18 01 22.7 -23 17 20           ~ 664 1
9 [CLC98] TC00 PoC 18 01 53.63 -22 50 57.6           ~ 1 0
10 IRAS 17589-2312 HII 18 01 57.1 -23 12 37           ~ 21 0
11 [CLC98] TC5 PoC 18 01 57.65 -23 12 44.6           ~ 5 0
12 SNR G007.1-00.0 SNR 18 02.0 -22 55           ~ 5 0
13 [CLC98] TC0b PoC 18 02 01.70 -22 57 00.0           ~ 1 0
14 [CLC98] TC6b PoC 18 02 01.94 -23 09 22.0           ~ 1 0
15 [CLC98] TC6a PoC 18 02 02.83 -23 09 39.2           ~ 1 0
16 [CLC98] TC6d PoC 18 02 03.01 -23 08 25.7           ~ 1 0
17 [CLC98] TC6c PoC 18 02 03.36 -23 08 39.7           ~ 1 0
18 [CLC98] TC6 PoC 18 02 03.37 -23 08 40.6           ~ 2 0
19 [CLC98] TC0c PoC 18 02 03.42 -22 57 27.6           ~ 1 0
20 [CLC98] TC7 PoC 18 02 03.50 -23 09 51.2           ~ 2 0
21 [CLC98] TC0d PoC 18 02 04.00 -22 57 55.5           ~ 1 0
22 [CLC98] TC3a PoC 18 02 05.57 -23 05 32.5           ~ 1 0
23 [CLC98] TC3c PoC 18 02 05.87 -23 05 03.9           ~ 1 0
24 [CLC98] TC0 PoC 18 02 06.3 -22 57 14           ~ 5 0
25 [CLC98] TC0a PoC 18 02 06.35 -22 57 13.6           ~ 1 0
26 [CLC98] TC3 PoC 18 02 07 -23 05.2           ~ 11 0
27 [CLC98] TC4a PoC 18 02 12.8 -23 05 47           ~ 2 0
28 [CLC98] TC4 PoC 18 02 12.8 -23 05 47           ~ 12 0
29 [LCC2001b] IRS 6 IR 18 02 14.1 -23 01 44           ~ 3 0
30 [CLC98] TC4b PoC 18 02 14.4 +23 06 47           ~ 4 0
31 [LCC2001b] IRS 7 IR 18 02 16.8 -23 00 52           ~ 3 0
32 2MASS J18021683-2300519 Y*O 18 02 16.83 -23 00 51.9           ~ 3 0
33 [CLC98] TC4c PoC 18 02 17.0 -23 07 13           ~ 3 0
34 [CLC98] TC11 PoC 18 02 20.40 -23 01 24.0           ~ 2 0
35 EM* LkHA 123 Em* 18 02 23.13015 -23 01 59.9462   8.72 6.80 9.37   B6V 40 0
36 HD 164492 Y*O 18 02 23.5527458788 -23 01 51.000902120 6.49 7.49 6.80 7.52   O7.5Vz 214 0
37 HD 164492B sg* 18 02 23.7097182315 -23 01 45.157059210   8.0 12.06     A2Ia 19 0
38 [CLC98] TC1 PoC 18 02 24.7 -23 01 18           ~ 6 0
39 SSTGLMC G007.0097-00.2542 Y*O 18 02 24.70680 -23 01 17.7204           ~ 12 0
40 [CLC98] TC9 PoC 18 02 27.25 -23 03 20.3           ~ 2 0
41 [CLC98] TC2 PoC 18 02 28.5 -23 03 57           ~ 12 0
42 HH 399 HH 18 02 28.9 -23 04 00           ~ 27 0
43 [CLC98] TC8 PoC 18 02 30.4 -23 00 22           ~ 4 0
44 [CLC98] TC12 PoC 18 02 31.66 -22 56 46.2           ~ 1 0
45 [CLC98] TC15 PoC 18 02 34.17 -23 06 53.0           ~ 1 0
46 [CLC98] TC16 PoC 18 02 34.46 -23 08 06.4           ~ 1 0
47 M 20 OpC 18 02 42 -22 58.3           ~ 401 1
48 [CLC98] TC14 PoC 18 02 47.26 -23 06 13.0           ~ 1 0
49 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 954 2
50 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1506 0
51 [CLC98] TC4f PoC ~ ~           ~ 1 0
52 [CLC98] TC3b PoC ~ ~           ~ 1 0
53 [CLC98] TC10 PoC ~ ~           ~ 2 0
54 [CLC98] TC13 PoC ~ ~           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2021.02.26-18:20:57

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