2012ApJ...744...86Z

Query : 2012ApJ...744...86Z

2012ApJ...744...86Z - Astrophys. J., 744, 86 (2012/January-2)

Millimeter multiplicity in DR21(OH): outflows, molecular cores, and envelopes.

ZAPATA L.A., LOINARD L., SU Y.-N., RODRIGUEZ L.F., MENTEN K.M., PATEL N. and GALVAN-MADRID R.

Abstract (from CDS):

We present sensitive high angular resolution (∼1'') millimeter continuum and line observations from the massive star-forming region DR21(OH) located in the Cygnus X molecular cloud. Within the well-known dusty MM1-2 molecular cores, we report the detection of a new cluster of about 10 compact continuum millimeter sources with masses between 5 and 24 M☉, and sizes of a few thousands of astronomical units. These objects are likely to be large dusty envelopes surrounding massive protostars, some of them most probably driving several of the outflows that emanate from this region. Additionally, we report the detection of strong millimeter emission of formaldehyde (H2CO) and methanol (CH3OH) near 218 GHz as well as compact emission from the typical outflow tracers carbon monoxide and silicon monoxide (CO and SiO) toward this massive star-forming region. The H2 CO and CH3OH emission is luminous (∼10–4 L☉), well resolved, and found along the collimated methanol maser outflow first identified at centimeter wavelengths and in the sources SMA6 and SMA7. Our observations suggest that this maser outflow might be energized by a millimeter source called SMA4 located in the MM2 dusty core. The CO and SiO emission traces some other collimated outflows that emanate from MM1-2 cores, and are not related with the low-velocity maser outflow.

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Journal keyword(s): ISM: individual (DR21(OH), W75S) - stars: formation - techniques: imaging spectroscopy

Nomenclature: Fig. 1, Table 1: [ZLS2012] SMAN (Nos SMA1-SMA9).

Simbad objects: 19

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Number of rows : 19
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 NAME NGC 6334 I(N) smm 17 20 54 -35 45.0           ~ 165 1
2 W 33a Y*O 18 14 39.56547 -17 52 02.2260           ~ 746 0
3 QSO J2015+371 BLL 20 15 28.72978661 +37 10 59.5147372     21.82 21.4   ~ 324 2
4 NAME Cyg X Cld 20 30 04.7973633 +40 51 36.002197           ~ 962 1
5 NAME DR 21(OH) MM 2 Mas 20 39 00.4 +42 22 44           ~ 41 0
6 [ZLS2012] SMA1 mm 20 39 00.400 +42 22 46.60           ~ 5 0
7 [ZLS2012] SMA2 mm 20 39 00.406 +42 22 46.78           ~ 3 0
8 [ZLS2012] SMA3 mm 20 39 00.453 +42 22 44.86           ~ 4 0
9 [ZLS2012] SMA4 mm 20 39 00.598 +42 22 44.94           ~ 4 0
10 NAME DR 21(OH) M Rad 20 39 01 +42 29.8           ~ 91 0
11 [ZLS2012] SMA6 mm 20 39 01.002 +42 22 48.93           ~ 6 0
12 [ZLS2012] SMA5 mm 20 39 01.010 +42 22 48.72           ~ 5 0
13 DR 21 (OH) cor 20 39 01.01 +42 22 50.2           ~ 427 0
14 [ZLS2012] SMA7 mm 20 39 01.079 +42 22 49.06           ~ 8 0
15 NAME DR 21(OH) MM 1 Mas 20 39 01.1 +42 22 49           ~ 43 0
16 [ZLS2012] SMA8 mm 20 39 01.192 +42 22 51.26           ~ 3 0
17 [ZLS2012] SMA9 mm 20 39 01.231 +42 22 51.43           ~ 3 0
18 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
19 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2397 1

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