2003A&A...405..655C

Query : 2003A&A...405..655C

2003A&A...405..655C - Astronomy and Astrophysics, volume 405, 655-661 (2003/7-2)

New detection of near-infrared H2 line emission in AFGL 5157.

CHEN Y., YAO Y., YANG J., ZENG Q. and SATO S.

Abstract (from CDS):

Narrow-band H2 v=1-0 S(1) and broad-band K' imaging observations towards AFGL 5157 revealed a number of new H2 knots associated with the NH3 core in the region, implying that the multiple H2 outflows are driven by a cluster of embedded point sources in the core. The shell around the infrared cluster is more clearly seen than before, showing a few of newly detected ridge-like features. A string of H2 knots newly revealed along one lobe of the known CO outflow suggests a parsec-scaled jet emanating from a young source in the core. These H2 outflows and jet, together with the known compact HII region, radio continuum source, and H2O masers further imply an extremely embedded cluster containing massive stars within it. The evidence shows that the massive young stars within the cluster are in a strong outflow stage of evolution, and together with the nearby infrared cluster in NGC 1985, further confirms that star forming process propagates from the west to the east in AFGL 5157. The two types of H2 line emission, knots and shell, may be indicators of two different stages of star formation in clusters: the shocked H2 knots are driven by the young stellar sources embraced in the younger cluster, while the diffuse shell-like structure comes from UV photons of relatively evolved cluster. The near-infrared nebula in AFGL 5157 is found to be only associated with the evolved cluster but not observed in the embedded cluster.

Abstract Copyright: ∼

Journal keyword(s): ISM: lines and bands - ISM: individual objects: AFGL 5157 - ISM: jets and outflows - stars: formation

Nomenclature: Table 1: [CYY99] H2 NNa (Nos 3a, 13a-13b, 14-15, 16a-16g, 17) added.

Simbad objects: 35

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Number of rows : 35
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 LDN 1448 DNe 03 22.5 +30 35           ~ 515 0
2 HH 211 Y*O 03 43 56.52 +32 00 52.8           ~ 369 0
3 HH 243 HH 05 32 27.83 +12 53 14.6   17.0       ~ 117 0
4 [CYY99] H2 16a ? 05 37 37.79 +32 01 07.4           ~ 1 0
5 [CYY99] H2 16b ? 05 37 38.93 +32 00 56.3           ~ 1 0
6 [CYY99] H2 16c ? 05 37 39.80 +32 01 13.7           ~ 1 0
7 [CYY99] H2 16d ? 05 37 41.57 +32 01 44.7           ~ 1 0
8 [CYY99] H2 16e ? 05 37 44.51 +32 01 35.1           ~ 1 0
9 HH 285 HH 05 37 45.69 +31 58 59.2           ~ 4 0
10 [CYY99] H2 16f ? 05 37 46.63 +32 01 25.3           ~ 1 0
11 NGC 1985 RNe 05 37 47.8 +31 59 24           ~ 136 2
12 HH 281 HH 05 37 48.12 +32 00 10.0           ~ 4 0
13 [CYY99] H2 17 ? 05 37 48.24 +31 56 59.8           ~ 1 0
14 HH 282 HH 05 37 48.84 +32 00 00.4           ~ 4 0
15 [CYY99] H2 16g ? 05 37 49.18 +32 00 20.3           ~ 1 0
16 [CYY99] H2 6 ? 05 37 49.26 +31 59 55.2           ~ 2 0
17 HH 283 HH 05 37 50.08 +31 59 52.6           ~ 4 0
18 [CYY99] H2 3a ? 05 37 50.95 +31 59 56.1           ~ 1 0
19 [CYY99] H2 14 IR 05 37 51.84 +32 00 03.0           ~ 1 0
20 [CYY99] H2 8 ? 05 37 51.85 +31 59 27.8           ~ 2 0
21 [CYY99] H2 7 ? 05 37 51.90 +32 00 24.6           ~ 2 0
22 [CYY99] H2 13a ? 05 37 52.39 +32 00 29.9           ~ 1 0
23 [CYY99] H2 13b ? 05 37 52.53 +32 00 35.7           ~ 1 0
24 HH 284 HH 05 37 53.46 +31 59 33.6           ~ 5 0
25 [CYY99] H2 9 ? 05 37 53.86 +31 59 28.3           ~ 2 0
26 [CYY99] H2 10 ? 05 37 53.93 +31 59 53.2           ~ 2 0
27 [CYY99] H2 11 ? 05 37 54.10 +32 00 17.5           ~ 2 0
28 [CYY99] H2 15 IR 05 37 54.77 +31 59 56.3           ~ 1 0
29 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 635 1
30 HH 212 HH 05 43 51.41 -01 02 53.1           ~ 392 1
31 2MASS J08254384-5100326 Y*O 08 25 43.85 -51 00 32.7           ~ 316 1
32 HH 47 HH 08 25 44.30 -51 00 26.2           ~ 247 0
33 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 572 0
34 SH 2-152 HII 22 58 40.8107767416 +58 46 59.226036024           ~ 139 1
35 NAME Cep E HII 23 03 12.779 +61 42 25.75           ~ 172 0

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