2011A&A...527A.145B


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.24CEST08:03:25

2011A&A...527A.145B - Astronomy and Astrophysics, volume 527A, 145-145 (2011/3-1)

The end of star formation in Chamaeleon I? A LABOCA census of starless and protostellar cores.

BELLOCHE A., SCHULLER F., PARISE B., ANDRE P., HATCHELL J., JORGENSEN J.K., BONTEMPS S., WEISS A., MENTEN K.M. and MUDERS D.

Abstract (from CDS):

Chamaeleon I is the most active region in terms of star formation in the Chamaeleon molecular cloud complex. Although it is one of the nearest low-mass star forming regions, its population of prestellar and protostellar cores is not known and a controversy exists concerning its history of star formation. Our goal is to search for prestellar and protostellar cores and characterize the earliest stages of star formation in this cloud. We used the bolometer array LABOCA at the APEX telescope to map the cloud in dust continuum emission at 870µm with a high sensitivity. This deep, unbiased survey was performed based on an extinction map derived from 2MASS data. The 870µm map is compared with the extinction map and C18O observations, and decomposed with a multiresolution algorithm. The extracted sources are analysed by carefully taking into account the spatial filtering inherent in the data reduction process. A search for associations with young stellar objects is performed using Spitzer data and the SIMBAD database. Most of the detected 870µm emission is distributed in five filaments. We identify 59 starless cores, one candidate first hydrostatic core, and 21 sources associated with more evolved young stellar objects. The estimated 90% completeness limit of our survey is 0.22M for the starless cores. The latter are only found above a visual extinction threshold of 5 mag. They are less dense than those detected in other nearby molecular clouds by a factor of a few on average, maybe because of the better sensitivity of our survey. The core mass distribution is consistent with the IMF at the high-mass end but is overpopulated at the low-mass end. In addition, at most 17% of the cores have a mass larger than the critical Bonnor-Ebert mass. Both results suggest that a large fraction of the starless cores may not be prestellar in nature. Based on the census of prestellar cores, Class 0 protostars, and more evolved young stellar objects, we conclude that the star formation rate has decreased with time in this cloud. The low fraction of candidate prestellar cores among the population of starless cores, the small number of Class 0 protostars, the high global star formation efficiency, the decrease of the star formation rate with time, and the low mass per unit length of the detected filaments all suggest that we may be witnessing the end of the star formation process in Chamaeleon I.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: individual objects: Chamaeleon I - ISM: structure - evolution - dust, extinction - stars: protostars

VizieR on-line data: <Available at CDS (J/A+A/527/A145): table2.dat table5.dat table6.dat table8.dat table9.dat cha1_870.fit>

Nomenclature: [BSP2011b] Ngcl NNN, [BSP2011b] Nadd N, [BSP2011b] Cha1-CNN, [BSP2011b] Cha1-SNN N=204.

Status in Simbad:  could be processed

CDS comments: Paragraph 2.1 IRAS 13134-6264 is a misprint for IRAS 13134-6242.

Simbad objects: 103

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Number of rows : 103

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 * alf UMi cC* 02 31 49.09456 +89 15 50.7923 3.00 2.62 2.02 1.53 1.22 F8Ib 601 2
2 LDN 1448 DNe 03 22.5 +30 35           ~ 459 0
3 NAME LDN 1448 IRS 2E Y*O 03 25 25.9 +30 45 03           ~ 44 0
4 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1008 0
5 IRAS 04191+1523 Y*O 04 22 00.439 +15 30 21.21           ~ 182 0
6 LDN 1521F DNe 04 28 39.3 +26 51 43           ~ 176 1
7 Bad 16 Y*O 04 30 50.280 +23 00 08.85   18.08   14.95   F1 132 0
8 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3310 0
9 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1326 0
10 LDN 1512 MoC 05 04 09.7 +32 43 09           ~ 159 0
11 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 653 0
12 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 434 1
13 V* V883 Ori FU* 05 38 18.0974260202 -07 02 25.963144400   14.80       F:I: 95 1
14 NGC 2071 RNe 05 47 10 +00 18.0           ~ 602 1
15 Ass Cha T 2-3 W Y*O 10 55 59.53 -77 24 39.2           M1.5 8 0
16 V* SX Cha Or* 10 55 59.731 -77 24 39.91   15.88 16.71   12.35 M1.5+M3 78 0
17 V* SY Cha Or* 10 56 30.3882538728 -77 11 39.402450501         11.29 K5Ve 110 0
18 V* SZ Cha TT* 10 58 16.7496916561 -77 17 17.183339177     12.68   10.62 K0e 99 0
19 QSO B1057-797 BLL 10 58 43.30977041 -80 03 54.1597166   19.08   17.31   ~ 145 0
20 V* TW Cha TT* 10 59 01.0608276980 -77 22 40.946475900     13.40   11.68 K8Ve 113 0
21 V* CS Cha TT* 11 02 24.8849252208 -77 33 35.683462615   12.88 11.69   10.123 K2Ve 184 0
22 Ass Cha T 2-14 A TT* 11 04 22.759 -77 18 08.09     17.89     K6/M0e 40 1
23 HH 48 HH 11 04 22.8 -77 18 08           ~ 37 0
24 HH 48E HH 11 04 25.4 -77 18 11           ~ 3 0
25 [PMG2001] NIR 16 IR 11 06 13.60 -77 23 27.2           ~ 2 0
26 [PMG2001] NIR 35 IR 11 06 23.94 -77 23 03.0           ~ 2 0
27 2MASS J11062554-7633418 Y*O 11 06 25.5204707067 -76 33 41.844129668     20.7   15.88 M5.25 27 0
28 1AXG J110700-7728 X 11 06 27.9 -77 22 46           ~ 2 0
29 [RNC96] Cha-MMS 1a mm 11 06 31.7 -77 23 32           ~ 5 1
30 [PCW91] Ced 110 IRS 10 Y*O 11 06 33.38 -77 23 34.6           ~ 57 1
31 IRAS 11051-7706 Y*O 11 06 46.025 -77 22 29.67           ~ 70 0
32 [PMG2001] NIR 72 IR 11 06 46.453 -77 22 37.11           ~ 3 0
33 [PMG2001] NIR 76 Y*? 11 06 46.580 -77 22 32.56           ~ 55 0
34 [PMG2001] NIR 74 IR 11 06 46.98 -77 22 38.3           ~ 2 0
35 NAME Cha I MoC 11 06 48 -77 18.0           ~ 936 1
36 [PMG2001] NIR 80 IR 11 06 48.01 -77 22 43.9           ~ 2 0
37 [PMG2001] NIR 93 IR 11 06 56.64 -77 22 05.5           ~ 2 0
38 [PCW91] Ced 110 IRS 11 Y*O 11 06 58.030 -77 22 48.87           ~ 19 0
39 [PMG2001] NIR 96 IR 11 06 58.15 -77 21 55.3           ~ 2 0
40 [PMG2001] NIR 101 IR 11 07 00.74 -77 22 11.1           ~ 2 0
41 [PMG2001] NIR 103 IR 11 07 01.93 -77 22 04.2           ~ 2 0
42 IRAS 11057-7706 Y*O 11 07 09.199 -77 23 04.99           ~ 58 0
43 [PCW91] Ced 110 IRS 6A IR 11 07 09.91 -77 23 06.3           ~ 6 0
44 [PMG2001] NIR 126 IR 11 07 14.14 -77 24 24.3           ~ 2 0
45 [PMG2001] NIR 129 IR 11 07 15.62 -77 24 44.2           ~ 2 0
46 [CCE98] 2-23 Or* 11 07 16.228 -77 23 06.83           M1 25 0
47 [PMG2001] NIR 130 IR 11 07 16.85 -77 24 27.3           ~ 2 0
48 HH 927 HH 11 07 17.5 -77 38 30           ~ 2 0
49 [PMG2001] NIR 134 IR 11 07 18.56 -77 23 19.4           ~ 2 0
50 [PMG2001] NIR 135 IR 11 07 19.36 -77 23 06.6           ~ 2 0
51 [PMG2001] NIR 136 IR 11 07 20.28 -77 24 35.6           ~ 2 0
52 [PMG2001] NIR 137 IR 11 07 20.72 -77 22 08.9           ~ 2 0
53 [CCE98] 2-24 Y*O 11 07 21.426 -77 22 11.76           M2 33 0
54 [PMG2001] NIR 140 IR 11 07 21.62 -77 22 16.4           ~ 2 0
55 [PMG2001] NIR 142 IR 11 07 22.04 -77 23 24.7           ~ 2 0
56 Ass Cha T 1-15 Or* 11 07 43.6609031154 -77 39 41.135416457   17.05 15.34   12.67 K5Ve 65 0
57 Ass Cha T 1-16 Or* 11 07 57.9375088232 -77 38 44.978809368   15.1 14.2   13.04 K6 61 0
58 HH 920B HH 11 07 59.0 -77 38 38           ~ 2 0
59 ESO-HA 562 Or* 11 08 02.8818832663 -77 38 42.559049944     17.61   14.41 M0.5+M0.5 39 0
60 HD 97048 Ae* 11 08 03.3105687971 -77 39 17.491180130 9.03 8.76 9.00   8.64 A0Vep 435 0
61 BRAN 341B BNe 11 08 03.4 -77 39 19           ~ 27 0
62 [HTN2003] HD 97048 2 IR 11 08 03.6 -77 38 42           ~ 2 0
63 V* HP Cha Y*O 11 08 15.099 -77 33 53.16     13.3     K7V 96 0
64 PDS 47a Y*O 11 08 15.71 -77 33 53.1           K3.5 80 1
65 NAME Cha IRN TT* 11 08 38.702 -77 43 51.54           M5 72 0
66 HJM C 9-1 Y*O 11 08 49.970 -77 43 39.33         16.97 ~ 4 0
67 HJM C 1-3 Y*O 11 09 26.0349781977 -76 33 33.890231773         17.78 ~ 14 0
68 V* GM Cha Or* 11 09 28.554 -76 33 28.14           M3.5-M6.5 41 0
69 V* HW Cha Or* 11 09 41.9197773612 -76 34 58.597303951           ~ 32 0
70 Hn 10W * 11 09 43.083 -76 34 38.64           ~ 5 0
71 HJM C 1-24 TT* 11 09 46.1867409078 -76 34 46.505353388   11.93 18.41   14.72 M3.25e 50 1
72 BYB 43 Y*O 11 09 47.3857825572 -77 26 29.196716064     20.08   16.62 M3.25e 42 0
73 ISO-ChaI 206 * 11 09 47.70 -76 51 18.0           ~ 4 0
74 HD 97300 Ae* 11 09 50.0178181814 -76 36 47.711452436   9.41 9.20   8.82 B9V 157 1
75 Ass Cha T 1-23 Or* 11 09 53.4191770981 -76 34 25.652662545   13.9 19.50 15.10 13.52 G9IIIe 77 0
76 HH 914 HH 11 09 53.8 -76 34 25           ~ 3 0
77 V* WW Cha Or* 11 10 00.0791962314 -76 34 57.971855660   14.74 14.10   10.95 K5 126 0
78 [PMK99] IR Cha INa4 Y*O 11 10 03.368 -76 33 11.13           M4: 15 0
79 HJM C 1-4 pr* 11 10 03.6833471517 -76 33 29.222406347     18.78 16.1 14.72 K8e 50 0
80 OTS 37 * 11 10 07.0 -76 36 53           ~ 2 0
81 HJM C 1-8 pr* 11 10 11.3920788538 -76 35 29.251306607         13.75 K5Ve 48 0
82 Ass Cha T 1-27 Or* 11 10 49.5666192333 -77 17 51.754825123   16.80 16.64   13.84 M4Ve 68 0
83 ESO-HA 569 Y*O 11 11 10.83288 -76 41 57.4332     20.28   17.34 M2.5 23 0
84 BRAN 341D RNe 11 12 27.1 -76 44 24           ~ 4 0
85 V* CV Cha TT* 11 12 27.7052551478 -76 44 22.298597430   12.02 10.98 10.51 9.76 G9Ve 168 1
86 2E 1110.9-7628 X 11 12 29.3 -76 44 20           ~ 1 0
87 NAME Cha Dark Cloud SFR 11 55 -78.0           ~ 527 1
88 IRAS 12340-7958 * 12 37 39.7466355997 -80 15 13.713429632   16.11 14.39 13.63 9.81 ~ 101 0
89 NAME Cha III MoC 12 37.8 -80 15           ~ 122 2
90 NAME Cha II MoC 12 54 -77.2           ~ 294 0
91 IRAS 13134-6242 mul 13 16 42.9 -62 58 45           ~ 28 0
92 [WBH98] 13134-6242 HII 13 16 46.3 -62 58 35           ~ 23 0
93 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 674 1
94 NAME Lup Cloud SFR 16 03 -38.1           ~ 481 0
95 GAL 332.80-00.60 HII 16 19 47 -51 04.1           ~ 91 1
96 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2930 0
97 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 998 1
98 LDN 1689B DNe 16 34 42.1 -24 36 11           ~ 131 0
99 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 317 1
100 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 882 2
101 NAME Aql Rift DNe 18 32 -01.0           ~ 215 1
102 NAME Gould Belt PoG ~ ~           ~ 684 1
103 NAME Aql Region reg ~ ~           ~ 282 0

    Equat.    Gal    SGal    Ecl

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2019.10.24-08:03:25

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