1999A&A...345..965C

Query : 1999A&A...345..965C

1999A&A...345..965C - Astronomy and Astrophysics, volume 345965-976 (1999/5-3)

Mapping of the extinction in giant molecular clouds using optical star counts.

CAMBRESY L.

Abstract (from CDS):

This paper presents large scale extinction maps of most nearby Giant Molecular Clouds of the Galaxy (Lupus, ρ Ophiuchus, Scorpius, Coalsack, Taurus, Chamaeleon, Musca, Corona Australis, Serpens, IC 5146, Vela, Orion, Monoceros R1 and R2, Rosette, Carina) derived from a star count method using an adaptive grid and a wavelet decomposition applied to the optical data provided by the USNO-Precision Measuring Machine. The distribution of the extinction in the clouds leads to estimate their total individual masses M and their maximum of extinction. I show that the relation between the mass contained within an iso-extinction contour and the extinction is similar from cloud to cloud and allows the extrapolation of the maximum of extinction in the range 5.7 to 25.5 magnitudes. I found that about half of the mass is contained in regions where the visual extinction is smaller than 1 magnitude. The star count method used on large scale (∼250 square degrees) is a powerful and relatively straightforward method to estimate the mass of molecular complexes. A systematic study of the all sky would lead to discover new clouds as I did in the Lupus complex for which I found a sixth cloud of about 104M☉.

Abstract Copyright: ∼

Journal keyword(s): methods: data analysis - ISM: clouds - ISM: dust, extinction - ISM: structure

CDS comments: NAME Lupus VI = Lupus 6, also found in 1999PASJ.51.895H

Simbad objects: 32

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Number of rows : 32
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
2 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
3 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 921 0
4 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
5 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 715 1
6 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1498 0
7 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1198 1
8 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 789 2
9 NAME Crossbones MoC 06 26 -10.           ~ 13 0
10 NAME Mon R1 As* 06 32 +10.2           ~ 38 0
11 NAME Rosette Molecular Cloud MoC 06 34.7 +04 02           ~ 277 0
12 NAME Vela SNR 08 34.0 -45 50           ~ 1331 2
13 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1071 2
14 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1266 1
15 DCld 300.0-17.0 DNe 11 58 -78.5           ~ 3 0
16 NAME Musca Cld 12 23 -71.3           ~ 258 0
17 * alf Cru SB* 12 26 35.89522 -63 05 56.7343           B0.5IV+B1V 99 0
18 NAME Coalsack Nebula DNe 12 31 19 -63 44.6           ~ 275 0
19 IRAS 12340-7958 LP* 12 37 39.7408011816 -80 15 13.707391932   16.11 14.39 13.63 9.81 ~ 108 0
20 NAME Cha III MoC 12 37.8 -80 15           ~ 147 2
21 NAME Cha II MoC 12 54 -77.2           ~ 361 0
22 Lupus 2 MoC 15 57 08 -37 47.1           ~ 119 1
23 Lupus 4 MoC 16 03 12.4 -42 07 43           ~ 163 0
24 Lupus 3 SFR 16 09.6 -39 03           ~ 348 0
25 Lupus 5 MoC 16 21 -37.5           ~ 63 0
26 Lupus 6 Cld 16 25 -40.3           ~ 51 1
27 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
28 NAME Scorpius Cloud MoC 16 29 00 -19 00.0           ~ 37 0
29 * alf Sco s*r 16 29 24.45970 -26 25 55.2094 4.08 2.75 0.91 -0.64 -1.87 M1.5Iab+B2Vn 786 0
30 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1195 1
31 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 554 0
32 IC 5146 OpC 21 53 29.3 +47 14 46           ~ 507 2

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