2003A&A...401.1017L


Query : 2003A&A...401.1017L

2003A&A...401.1017L - Astronomy and Astrophysics, volume 401, 1017-1022 (2003/4-3)

Centimetre continuum emission from young stellar objects in Cederblad 110.

LEHTINEN K., HARJU J., KONTINEN S. and HIGDON J.L.

Abstract (from CDS):

The low-mass star formation region associated with the reflection nebula Cederblad 110 in the Chamaeleon I cloud was mapped with the Australian Telescope Compact Array (ATCA) at 6 and 3.5cm. Altogether 11 sources were detected, three of which are previously known low mass young stellar objects associated with the nebula: the illuminating star IRS 2 (Class III, Einstein X-ray source CHX 7), the brightest far-infrared source IRS 4 (Class I), and the weak X-ray source CHX10a (Class III). The other young stellar objects in the region, including the Class 0 protostar candidate Cha-MMS1, were not detected. The radio spectral index of IRS 4 (α= 1.7±0.3) is consistent with optically thick free-free emission arising from a dense ionized region, probably a jet-induced shock occurring in the circumstellar material. As the only Class I protostar with a ``thermal jet'' IRS 4 is the strongest candidate for the central source of the molecular outflow found previously in the region. The emission from IRS 2 has a flat spectrum (α= 0.05 ±0.05) but shows no sign of polarization, and therefore its origin is likely to be optically thin free-free emission either from ionized wind or a collimated jet. The strongest source detected in this survey is a new compact object with a steep negative spectral index (-1.1) and a weak linear polarization (∼2 %), which probably represents a background radio galaxy.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: individual objects: Cederblad 110 - ISM: clouds - radio continuum: ISM

Nomenclature: Fig.1, Table 3: [LHK2003] Ced 110 ANa (Nos R1-R4, R5a-R5b, R6-R7).

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 - 2023
#notes
1 QSO B1057-797 BLL 10 58 43.30979475 -80 03 54.1598058   19.08   17.31   ~ 174 0
2 [LHK2003] Ced 110 R1 Rad 11 05 13.9 -77 21 01           ~ 1 0
3 CHXR 15 Y*O 11 05 42.8800288464 -77 26 51.567587304         13.51 M5+M5 33 0
4 [LHK2003] Ced 110 R2 Rad 11 05 44.5 -77 26 39           ~ 1 0
5 HH 50 HH 11 05 49.6 -77 33 10           ~ 31 0
6 HH 49 HH 11 06 00.05 -77 33 36.0           ~ 34 0
7 [LHK2003] Ced 110 R3 Rad 11 06 00.8 -77 22 06           ~ 1 0
8 Ass Cha T 2-21 TT* 11 06 15.3471261840 -77 21 56.720362608   12.58 11.01   9.35 G5Ve 130 0
9 [LHK2003] Ced 110 R4 Rad 11 06 17.4 -77 22 38           ~ 2 0
10 [PCW91] Ced 110 IRS 10 Y*O 11 06 33.38 -77 23 34.6           ~ 65 1
11 IRAS 11051-7706 Y*O 11 06 46.025 -77 22 29.67           ~ 79 0
12 [PMG2001] NIR 72 NIR 11 06 46.453 -77 22 37.11           ~ 3 0
13 [PMG2001] NIR 76 Y*? 11 06 46.580 -77 22 32.56           ~ 55 0
14 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1095 1
15 [PMG2001] NIR 84 IR 11 06 51.09 -77 20 07.1           ~ 2 0
16 [PMG2001] NIR 89 Y*O 11 06 53.80 -77 23 59.9           ~ 6 0
17 [PCW91] Ced 110 IRS 11 Y*O 11 06 58.030 -77 22 48.87           ~ 19 0
18 IRAS 11057-7706 Y*O 11 07 09.19896 -77 23 04.9920           ~ 60 0
19 [LHK2003] Ced 110 R5b Rad 11 07 12.2 -77 21 56           ~ 1 0
20 [LHK2003] Ced 110 R5a Rad 11 07 13.4 -77 21 58           ~ 1 0
21 V* GZ Cha Or* 11 07 16.22784 -77 23 06.8316           M1 26 0
22 [CCE98] 2-24 Y*O 11 07 21.426 -77 22 11.76           M2 33 0
23 [LHK2003] Ced 110 R6 Rad 11 07 49.5 -77 21 55           ~ 1 0
24 RX J1108.2-7728 Y*O 11 07 55.775088 -77 27 25.52724   15.26 13.40 13.07 11.04 K3Ve 55 0
25 [LHK2003] Ced 110 R7 Rad 11 08 08.0 -77 23 47           ~ 1 0
26 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1137 1

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2023.01.27-12:18:55

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