2002ApJ...575..291H

Query : 2002ApJ...575..291H

2002ApJ...575..291H - Astrophys. J., 575, 291-305 (2002/August-2)

Molecular hydrogen outflows in W51.

HODAPP K.W. and DAVIS C.J.

Abstract (from CDS):

We present the results of a deep search for the molecular hydrogen shock fronts associated with young stellar outflows in the giant molecular cloud and massive star-forming region W51. A total of 14 outflows were identified by comparing images in the H and K bands and in a narrowband filter centered on the H2 1-0 S(1) line at 2.122 µm. A few of the newly discovered outflows were subsequently imaged at higher spatial resolution in the S(1) filter; one outflow was also imaged in the 1.644 µm emission line of [Fe II]. For two of the outflows, high-resolution echelle spectroscopy in the H2 1-0 S(1) line was obtained using NIRSPEC at Keck. For one outflow additional high-resolution spectra were obtained in the [Fe II] line and in Brγ. The largest and best-studied outflow shock front shows a remarkably broad [Fe II] line, an unusual high-velocity component in Brγ, and comparably narrow line widths in the H2 1-0 S(1) line. A scenario involving high-velocity shocks and UV excitation of preshock material is used to explain these spectra.

Abstract Copyright: ∼

Journal keyword(s): Infrared: ISM - ISM: Jets and Outflows - ISM: Lines and Bands - ISM: Molecules - Stars: Formation - Stars: Pre-Main-Sequence

Nomenclature: Fig.2: W51H2 JHHMMSS.s+DDMMSS N=14. Fig.5: W51H2 J192323.6+142515 WA (Nos N, C, S, SA-SC). Fig.7: W51H2 J192339.7+143131 A (Nos A-C).

Simbad objects: 36

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Number of rows : 36
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 2MASS J03290842+3115284 NIR 03 29 08.420 +31 15 28.48           ~ 229 1
2 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 900 0
3 NAME HH 240/241 DNe 05 19 48.9 -05 52 05           ~ 115 1
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
5 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2421 1
6 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
7 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1276 2
8 HH 111 HH 05 51 44.207 +02 48 33.87           ~ 418 0
9 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1227 1
10 Cl* NGC 6205 KAD 185 * 16 40 41.29 +36 21 13.1   15.38 14.70     G8IV/V 31 0
11 W51H2 J192318.1+142738 PoC 19 23 18.1 +14 27 38           ~ 1 0
12 W51H2 J192318.5+142656 PoC 19 23 18.5 +14 26 56           ~ 1 0
13 W51H2 J192319.6+142654 PoC 19 23 19.6 +14 26 54           ~ 1 0
14 W51H2 J192322.0+143333 PoC 19 23 22.0 +14 33 33           ~ 1 0
15 W51H2 J192323.6+142515 PoC 19 23 23.6 +14 25 15           ~ 1 0
16 W51H2 J192325.9+143703 PoC 19 23 25.9 +14 37 03           ~ 1 0
17 W51H2 J192327.9+143701 PoC 19 23 27.9 +14 37 01           ~ 1 0
18 W 51a HII 19 23 29.3 +14 31 38           ~ 186 0
19 W51H2 J192335.0+143028 PoC 19 23 35.0 +14 30 28           ~ 2 0
20 W51H2 J192336.6+143014 PoC 19 23 36.6 +14 30 14           ~ 2 0
21 JCMTLSP J192338.5+143038 PoC 19 23 38.3 +14 30 47           ~ 5 0
22 W51H2 J192339.7+143131 PoC 19 23 39.7 +14 31 31           ~ 3 0
23 MHO 2419 out 19 23 39.7 +14 31 31           ~ 1 0
24 [WBN74] W 51 IRS 2 SFR 19 23 39.93 +14 31 09.4           ~ 321 0
25 NAME W 51 IRS 1 HII 19 23 41.9 +14 30 36           ~ 124 0
26 NAME W 51 Main reg 19 23 43.8 +14 30 37           ~ 147 0
27 W51H2 J192345.5+143537 PoC 19 23 45.5 +14 35 37           ~ 1 0
28 SSTOERC G049.4836-00.4060 Y*? 19 23 47.23 +14 29 43.3           ~ 3 0
29 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
30 W51H2 J192403.3+143255 PoC 19 24 03.3 +14 32 55           ~ 1 0
31 W51H2 J192323.6+142515 S PoC ~ ~           ~ 1 0
32 W51H2 J192323.6+142515 C PoC ~ ~           ~ 1 0
33 W51H2 J192323.6+142515 N PoC ~ ~           ~ 1 0
34 W51H2 J192323.6+142515 SA PoC ~ ~           ~ 1 0
35 W51H2 J192323.6+142515 SB PoC ~ ~           ~ 1 0
36 W51H2 J192323.6+142515 SC PoC ~ ~           ~ 1 0

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