2000A&A...364..769T


Query : 2000A&A...364..769T

2000A&A...364..769T - Astronomy and Astrophysics, volume 364, 769-779 (2000/12-2)

ISOPHOT Serendipity Survey observations of interstellar clouds. I. Detection of the Coldest Cores in Chamaeleon.

TOTH L.V., HOTZEL S., KRAUSE O., LEHTINEN K., LEMKE D., MATTILA K., STICKEL M. and LAUREIJS R.J.

Abstract (from CDS):

ISOPHOT Serendipity Survey (ISOSS) observations at 170µm reveal cold dust clouds in the nearby star forming region Chamaeleon. The distribution of the ISOSS/IRAS based T(I170/I100) colour temperature have been studied in a nearby low-mass star forming region. T(I170/I100) separates the obscured and intercloud regions as seen from a comparison to optical extinction data. The interstellar medium in Chamaeleon-Musca appears to be cold with dust colour temperatures of ≃16.3K for intercloud regions, and ≤14.5K for obscured clouds. The cold clouds account for 3% of the area. ISOSS found 9 very cold cores with colour temperatures as low as Tdust1mm~<12.5K in an 11°x8° sized region. All C18O cores of the Chamaeleon main clouds which were crossed by ISOSS slews were also detected. Of these 11 (73%) are cold with Tdust≤15K, 6 (40%) are associated with very cold cores. The very cold cores have high gas column densities, N(H2)>1021cm–2, and 7 out of 9 have low gas kinetic temperatures as indicated by Tex(C18O)≃8K. The physical parameters of the very cold cores agree with the results of radiative transfer calculations of a spherical model cloud heated from outside by one third of the the solar neighbourhood ISRF intensity. A check of the photometric calibration of ISOSS against ISOPHOT AOT PHT22 maps and DIRBE interpolated 170µm values showed an agreement of ±10% and ±20%, respectively. We expect to discover in total more than 100 very cold cores in the Galaxy by ISOSS.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: dust, extinction - ISM: individual objects: Chamaeleon clouds - ISM: molecules - infrared: ISM: continuum - surveys

Nomenclature: Table 1: [THK2000] N (Nos 1-9).

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 GAL 295-17 Cld 10 15 -77.4           ~ 6 0
2 ISOSS J10495-7705 IR 10 49 30 -77 05.0           ~ 1 0
3 DCld 296.2-15.8 DNe 10 50 39 -77 04.6           ~ 4 0
4 NAME Musca Filament PoC 10 54 -74.0           ~ 29 0
5 ISOSS J10549-7711 IR 10 54 55 -77 11.0           ~ 1 0
6 DCld 296.5-15.7 DNe 10 56 10 -77 07.5           ~ 4 0
7 [DB2002b] G297.10-16.08 DNe 11 02 21 -77 42.0           ~ 5 0
8 ISOSS J11035-7759 IR 11 03 30 -77 59.0           ~ 2 0
9 ISOSS J11037-7748 IR 11 03 45 -77 48.5           ~ 2 0
10 ISOSS J11045-7738 IR 11 04 30 -77 04.5           ~ 2 0
11 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1058 1
12 NAME Cha IR Nebula TT* 11 08 38.702 -77 43 51.54           M5.5 72 0
13 Ced 112 RNe 11 09 52.4 -76 36 57           ~ 31 0
14 ISOSS J11102-7648 IR 11 10 15 -76 48.0           ~ 1 0
15 [DB2002b] G297.15-15.09 DNe 11 10 30 -76 49.4           ~ 5 0
16 GAL 298-13 Cld 11 35 -75.4           ~ 6 0
17 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 740 0
18 NAME Cha-Mus DNe 12 15 -76.7           ~ 33 0
19 IRAS 12340-7958 LP? 12 37 39.7408011816 -80 15 13.707391932   16.11 14.39 13.63 9.81 ~ 106 0
20 NAME Cha III MoC 12 37.8 -80 15           ~ 134 2
21 ISOSS J12500-7655 IR 12 50 00 -76 55.0           ~ 1 0
22 DCld 302.9-14.1 DNe 12 50 24 -76 55.4           ~ 4 0
23 NAME Cha II MoC 12 54 -77.2           ~ 313 0
24 ISOSS J12560-7913 IR 12 56 00 -79 13.0           ~ 1 0
25 ISOSS J12592-7712 IR 12 59 15 -77 12.0           ~ 1 0
26 [DB2002b] G303.48-14.40 DNe 13 01 04 -77 16.1           ~ 5 0

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2022.05.24-07:28:13

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