1998AJ....116.2953A

Query : 1998AJ....116.2953A

1998AJ....116.2953A - Astron. J., 116, 2953-2964 (1998/December-0)

Spectral indices of centimeter continuum sources in star-forming regions: implications on the nature of the outflow exciting sources.

ANGLADA G., VILLUENDAS E., ESTALELLA R., BELTRAN M.T., RODRIGUEZ L.F., TORRELLES J.M. and CURIEL S.

Abstract (from CDS):

We present 6 cm VLA observations of nine regions with molecular or HH outflows that appear to be driven by young stellar objects of low bolometric luminosity. Radio continuum emission at 3.6 cm had been detected previously toward the center of symmetry of 13 outflows in these regions. With the new 6 cm observations we have been able to estimate the spectral index in the 6 to 3.6 cm wavelength range for 11 of these outflow central (Class 0 and Class I) sources. All the spectral indices obtained for these central sources are positive and consistent with partially thick thermal free-free emission. We discuss this result in relation to the current models for the origin of centimeter radio continuum emission in outflow sources. In particular, we find that the observed flux densities of these sources fit very well in the observational correlation between the radio continuum luminosity and the momentum rate of the outflow, and that the results are consistent with the central sources being thermal radio jets. Our data suggest that the ionized part of the jets begins at a distance ≲10 AU from the star. In addition, we have derived a positive value for the spectral index of HH 32A, indicative of partially thick thermal emission. For the remaining sources detected in the nine fields observed, our results indicate that the emission is, in general, nonthermal, as expected for background extragalactic sources. However, a few of these sources could be related to the star-forming regions studied.

Abstract Copyright: ∼

Journal keyword(s): ISM: Jets and Outflows - Radio Continuum - Stars: Formation

Nomenclature: Table 2: [ARC92] AS 353A N (Nos 6-8) added, [ARC92] Barn 335 NN (Nos 8-12) added. Table 2: [AVE98] LDN 1641N N (Nos 1-7), [AVE98] Haro 4-255 N (Nos 1-2), [AVE98] HH 24-26 NN (Nos 1-11), [AVE98] LDN 1617 N (Nos 1-8), [AVE98] LDN 1251B N (Nos 1-4), [AVE98] LDN 1262 N (Nos 1-5).

CDS comments: * SSV 61 = SSV LDN 1630 61. T.2: sources in RNO 43 = [ARC92] RNO 43 N.

Simbad objects: 85

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Number of rows : 85
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 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
2 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
3 [EM98] DG Tau B cRN Y*O 04 27 02.66088 +26 05 30.4548           ~ 208 0
4 V* HL Tau Or* 04 31 38.5107609312 +18 13 57.859747968   15.89 14.49 14.39   K5 1546 0
5 IRAS 04287+1807 mul 04 31 38.8 +18 13 57           ~ 797 0
6 [GR92] 0529+075 Rad 05 32 +07.5           ~ 3 0
7 [ARC92] RNO 43 1 Rad 05 32 11.34 +12 46 48.7           ~ 2 0
8 JCMTSE J053219.3+124938 smm 05 32 19 +12 49.7           ~ 5 0
9 [ARC92] RNO 43 3 Rad 05 32 23.66 +12 56 10.5           ~ 2 0
10 HH 243 HH 05 32 27.83 +12 53 14.6   17.0       ~ 119 0
11 [ARC92] RNO 43 4 Rad 05 32 28.94 +12 53 44.2           ~ 2 0
12 [ARC92] RNO 43 5 Rad 05 32 32.43 +12 56 47.9           ~ 2 0
13 [ARC92] RNO 43 6 Rad 05 32 32.61 +12 58 49.9           ~ 2 0
14 [AVE98] LDN 1641N 1 Rad 05 36 13.58 -06 22 01.9           ~ 2 0
15 NAME LDN 1641 North HII 05 36 17.6 -06 22 10           ~ 252 0
16 [AVE98] LDN 1641N 2 Rad 05 36 18.83 -06 22 11.3           ~ 2 0
17 [AVE98] LDN 1641N 3 Rad 05 36 19.39 -06 22 12.5           ~ 1 0
18 [AVE98] LDN 1641N 4 Rad 05 36 22.5520600 -06 25 13.661660           ~ 3 0
19 NAME HH 1-2 HH 05 36 22.8 -06 46 03           ~ 209 1
20 GBS-VLA J053622.86-064606.6 Y*O 05 36 22.84 -06 46 06.2           ~ 111 0
21 V* PR Ori Or* 05 36 24.9926892648 -06 17 32.551271232   12.59 11.40 10.89   K1.0 57 0
22 [AVE98] LDN 1641N 6 Rad 05 36 26.03 -06 18 09.4           ~ 1 0
23 [AVE98] LDN 1641N 7 Rad 05 36 27.14 -06 21 11.4           ~ 2 0
24 [KSP2003] J053919.44-072619.3 Rad 05 39 19.50 -07 26 20.4           ~ 2 0
25 [AVE98] Haro 4-255 2 Rad 05 39 21.96 -07 23 51.5           ~ 1 0
26 Haro 4-255 Or* 05 39 22.3402033872 -07 26 44.480192532   15 15.830   12.969 K0 111 0
27 QSO B0539-057 Bla 05 41 38.08336552 -05 41 49.4283917     20.4 20.70   ~ 279 1
28 [AVE98] HH 24-26 7 Rad 05 45 44.10 -00 14 58.6           ~ 1 0
29 [AVE98] HH 24-26 8 Rad 05 45 56.38 -00 15 41.4           ~ 1 0
30 GBS-VLA J054557.81-000929.0 X 05 45 57.81 -00 09 29.0           ~ 8 0
31 [AVE98] HH 24-26 9 Rad 05 46 03.17 -00 16 02.4           ~ 1 0
32 NAME HH 24-26 MoC 05 46 07.34 -00 13 31.3           ~ 36 0
33 NAME HH 25MMS Y*O 05 46 07.8 -00 13 41           ~ 59 0
34 2MASS J05460787-0010014 Y*O 05 46 07.873 -00 10 01.41           ~ 36 0
35 HBC 502 TT* 05 46 07.8799942272 -00 11 56.887013256     14.5     K3 56 0
36 IRAS 05435-0011 Y*O 05 46 08.45544 -00 10 02.9568           ~ 91 0
37 HGBS J054608.3-001044 Y*O 05 46 08.8 -00 10 47           ~ 92 0
38 [AVE98] HH 24-26 10 Rad 05 46 13.00 -00 17 40.2           ~ 1 0
39 [AVE98] HH 24-26 11 Rad 05 46 15.68 -00 17 14.4           ~ 1 0
40 [AVE98] LDN 1617 2 Rad 05 51 24.69 +02 53 25.5           ~ 1 0
41 [AVE98] LDN 1617 3 Rad 05 51 29.41 +02 44 31.1           ~ 1 0
42 LDN 1617 DNe 05 51 46 +02 48.5           ~ 62 0
43 HGBS J055146.1+024829 Y*O 05 51 46.3 +02 48 28           ~ 94 0
44 [AVE98] LDN 1617 4 Rad 05 51 47.41 +02 47 52.0           ~ 1 0
45 [AVE98] LDN 1617 5 Rad 05 51 53.02 +02 52 57.0           ~ 1 0
46 [AVE98] LDN 1617 6 Rad 05 51 57.08 +02 48 37.5           ~ 1 0
47 [AVE98] LDN 1617 7 Rad 05 51 58.04 +02 51 01.4           ~ 1 0
48 [AVE98] LDN 1617 8 Rad 05 51 58.69 +02 45 02.0           ~ 1 0
49 NAME HH 80-81 HH 18 19 06 -20 51.4           ~ 236 0
50 [ARC2001] HH 32 VLA 1 Rad 19 20 12.07 +11 01 34.8           ~ 3 0
51 [ARC92] AS 353A 6 Rad 19 20 18.97 +10 56 16.8           ~ 1 0
52 [ARC2001] HH 32 VLA 2 Rad 19 20 26.63 +11 00 13.8           ~ 3 0
53 HH 32A HH 19 20 29.49 +11 02 01.7           ~ 39 0
54 [ARC92] AS 353A 7 Rad 19 20 30.96 +11 01 55.5           ~ 1 0
55 EM* AS 353 Or* 19 20 30.9918166680 +11 01 54.605482968   13.22 12.21     K5 197 1
56 [ARC2001] HH 32 VLA 6 Rad 19 20 33.10 +11 03 02.2           ~ 3 0
57 [ARC92] AS 353A 8 Rad 19 20 43.70 +10 57 58.0           ~ 1 0
58 [ARC92] AS 353A 5 Rad 19 20 54.55 +10 56 13.6           ~ 2 0
59 [ARC92] Barn 335 8 Rad 19 36 39.99 +07 38 22.1           ~ 1 0
60 [ARC92] Barn 335 9 Rad 19 36 44.38 +07 36 42.8           ~ 1 0
61 [ARC92] Barn 335 1 Rad 19 36 47.65 +07 32 58.0           ~ 2 0
62 [ARC2001] HH 119 VLA 1 Rad 19 36 49.49 +07 35 04.1           ~ 3 0
63 LDN 663 DNe 19 36 55 +07 34.4           ~ 698 0
64 [ARC2001] HH 119 VLA 2 Rad 19 36 55.51 +07 37 00.5           ~ 3 0
65 IRAS 19345+0727 cor 19 37 00.7 +07 34 08           ~ 96 0
66 [ARC92] Barn 335 10 Rad 19 37 07.84 +07 28 58.1           ~ 1 0
67 [ARC92] Barn 335 11 Rad 19 37 08.73 +07 31 41.4           ~ 1 0
68 [ARC2001] HH 119 VLA 4 Rad 19 37 11.75 +06 31 37.6           ~ 3 0
69 [ARC2001] HH 119 VLA 5 Rad 19 37 11.88 +07 31 29.6           ~ 3 0
70 [ARC2001] HH 119 VLA 6 Rad 19 37 12.64 +07 34 01.7           ~ 3 0
71 [ARC92] Barn 335 12 Rad 19 37 19.79 +07 28 52.3           ~ 1 0
72 ICRF J195005.5+080713 QSO 19 50 05.53991678 +08 07 13.9809868     18.0     ~ 75 1
73 6C 222905+693121 BLL 22 30 36.46973826 +69 46 28.0769147     19.6 20.11   ~ 105 1
74 [AVE98] LDN 1251B 1 Rad 22 37 04.90 +75 11 08.4           ~ 2 0
75 IRAS 22376+7455 TT* 22 38 42.5032929744 +75 11 45.489819660   17.65 16.10 14.90 13.62 ~ 53 0
76 LDN 1251B DNe 22 38 46.79 +75 11 32.6           ~ 51 1
77 [AVE98] LDN 1251B 4 Rad 22 39 31.67 +75 07 51.7           ~ 1 0
78 [AVE98] LDN 1251B 2 Rad 22 39 53.47 +05 13 05.2           ~ 1 0
79 NAME Cep A HW 2 Y*O 22 56 17.9 +62 01 49           B0.5 243 0
80 [AVE98] LDN 1262 1 Rad 23 24 46.51 +74 11 29.2           ~ 1 0
81 [AVE98] LDN 1262 2 Rad 23 25 14.94 +74 18 55.0           ~ 1 0
82 [AVE98] LDN 1262 3 Rad 23 25 44.64 +74 11 39.2           ~ 1 0
83 PSCz Q23238+7401 Y*O 23 25 46.65 +74 17 37.2           ~ 61 1
84 LDN 1262 MoC 23 25 47 +74 17.6           ~ 136 0
85 [AVE98] LDN 1262 5 Rad 23 25 55.06 +74 14 01.5           ~ 1 0

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