1996A&A...310..961D

Query : 1996A&A...310..961D

1996A&A...310..961D - Astronomy and Astrophysics, volume 310961-969 (1996/6-3)

Near-IR imaging and spectroscopy of DR21: a case for supersonic turbulence.

DAVIS C.J. and SMITH M.D.

Abstract (from CDS):

New, H2 v=1-0S(1) narrow-band and K-band images of one of the most massive and most energetic YSO outflows known, DR21, are presented. We also present H2 line profiles at positions across both outflow lobes. The complex, turbulent nature of the outflow is clearly evident in both the images and the line profiles. Remarkable asymmetries in the line profiles and oscillations in the line peak velocities are measured, particularly in the southwestern outflow lobe. We model the profiles with both planar and unresolved, bow shaped shocks. Also, from our data, and from a consideration of earlier work, two outflow episodes are inferred: an early jet produces a narrow cone-like flow towards the southwest, and a late core-dispersal phase generates the supersonic turbulence, observed here through wide, oscillating profiles from planar shock waves. These two phases are being increasingly recognised in other outflows from deeply-embedded stars.

Abstract Copyright: ∼

Journal keyword(s): Shock waves - ISM: individual: DR 21 - ISM: jets and outflows - ISM: molecules - infrared: interstellar: lines - infrared: stars

Nomenclature: Table 1: [DS96] IN (Nos I1-I6), [DS96] ON (Nos O1-O2). Fig.4: [DS96] Knot A (Nos A-Z).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 18

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Number of rows : 18
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 HH 211 Y*O 03 43 56.52 +32 00 52.8           ~ 414 0
2 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 900 0
3 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1249 2
4 HH 212 HH 05 43 51.41 -01 02 53.1           ~ 443 1
5 NAME HH 46-47 HH 08 25 43.6 -51 00 36           ~ 216 2
6 * b03 Cyg dS* 20 14 32.0323540824 +36 48 22.700909124 5.10 5.11 4.99 4.79 4.72 A2V 284 0
7 2MASS J20385908+4219394 NIR 20 38 59.08 +42 19 39.5           ~ 3 0
8 2MASS J20385932+4219273 NIR 20 38 59.32 +42 19 27.4           ~ 2 0
9 [DS96] I1 IR 20 39 00.0 +42 19 38           ~ 2 0
10 [DS96] I2 IR 20 39 00.1 +42 19 45           ~ 1 0
11 [DKS2007] DR21-IRS 1 IR 20 39 00.4 +42 19 37           ~ 9 0
12 [DS96] I3 IR 20 39 00.5 +42 19 40           ~ 1 0
13 [DS96] I6 IR 20 39 00.8 +42 19 32           ~ 1 0
14 [DS96] O2 * 20 39 00.8144934888 +42 20 23.517774276           ~ 1 0
15 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
16 2MASS J20390353+4219420 * 20 39 03.5389737984 +42 19 42.104503920           ~ 1 0
17 HD 199260 PM* 20 56 47.3316655128 -26 17 46.960329480   6.20 5.70     F6V 131 0
18 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 760 2

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