2003ApJ...584..882S


Query : 2003ApJ...584..882S

2003ApJ...584..882S - Astrophys. J., 584, 882-894 (2003/February-3)

Clustered star formation in W75 N.

SHEPHERD D.S., TESTI L. and STARK D.P.

Abstract (from CDS):

We present 2"-7" resolution 3 mm continuum and CO(J=1-0) line emission and near-infrared Ks, H2, and [Fe II] images toward the massive star-forming region W75 N. The CO emission uncovers a complex morphology of multiple, overlapping outflows. A total flow mass of greater than 255 Mextends 3 pc from end to end and is being driven by at least four late to early-B protostars. More than 10% of the molecular cloud has been accelerated to high velocities by the molecular flows (>5.2 km/s relative to vLSR) and the mechanical energy in the outflowing gas is roughly half the gravitational binding energy of the cloud. The W75 N cluster members represent a range of evolutionary stages, from stars with no apparent circumstellar material to deeply embedded protostars that are actively powering massive outflows. Nine cores of millimeter-wavelength emission highlight the locations of embedded protostars in W75 N. The total mass of gas and dust associated with the millimeter cores ranges from 340 to 11 M. The infrared reflection nebula and shocked H2emission have multiple peaks and extensions which, again, suggests the presence of several outflows. Diffuse H2emission extends about 0.6 pc beyond the outer boundaries of the CO emission while the [Fe II] emission is only detected close to the protostars. The infrared line emission morphology suggests that only slow, nondissociative J-type shocks exist throughout the parsec-scale outflows. Fast, dissociative shocks, common in jet-driven low-mass outflows, are absent in W75 N. Thus, the energetics of the outflows from the late to early B protostars in W75 N differ from their low-mass counterparts–they do not appear to be simply scaled-up versions of low-mass outflows.

Abstract Copyright:

Journal keyword(s): ISM: H II Regions - ISM: Jets and Outflows - ISM: Molecules - Stars: Formation

Nomenclature: Fig.2: [STS2003] WW-A (Nos SW-A to SW-K, C-A to C-B, NE-A to NE-I). Fig.5, Table 1: [S2001] MM N (Nos 5-9) added.

Simbad objects: 56

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Number of rows : 56
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Ori I As* 05 38 -02.8           ~ 570 0
2 GAL 192.16-03.82 HII 05 58 13.4 +16 32 00           ~ 137 1
3 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5458 1
4 3C 345 QSO 16 42 58.8100340220 +39 48 36.999540578   16.81 16.59 16.84   ~ 1588 2
5 NAME HH 80-81 HH 18 19 06 -20 51.4           ~ 199 0
6 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 406 0
7 NAME Cyg X Cld 20 28 41 +41 10.2           ~ 664 1
8 [DSM98] W75N A ? 20 38 26.2 +42 36 32           ~ 3 0
9 [DSM98] W75N B ? 20 38 26.5 +42 36 41           ~ 3 0
10 [DSM98] W75N C ? 20 38 28.1 +42 36 32           ~ 2 0
11 [DSM98] W75N D ? 20 38 29.7 +42 37 10           ~ 2 0
12 [DSM98] W75N E ? 20 38 30.0 +42 36 34           ~ 2 0
13 [DSM98] W75N F ? 20 38 30.7 +42 36 49           ~ 2 0
14 [DSM98] W75N G ? 20 38 30.8 +42 37 11           ~ 2 0
15 JCMTSF J203830.7+423628 smm 20 38 31.1 +42 36 36           ~ 3 0
16 [S2001] MM 8 mm 20 38 33.68 +42 38 01.7           ~ 2 0
17 [YST88] IRS 2 Y*O 20 38 35.37 +42 37 13.7           ~ 11 0
18 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 368 1
19 [S2001] MM 2 mm 20 38 35.92 +42 37 32.1           ~ 9 0
20 [S2001] MM 4 mm 20 38 36.30 +42 37 29.9           ~ 4 0
21 [S2001] MM 6 mm 20 38 36.31 +42 37 55.9           ~ 2 0
22 [S2001] MM 1 mm 20 38 36.39 +42 37 34.1           ~ 11 0
23 [YST88] IRS 1 IR 20 38 36.4 +42 37 35           ~ 14 0
24 [HRB81] W75N(Ba) HII 20 38 36.445 +42 37 34.82           ~ 45 0
25 NAME W75N(B) HII 20 38 36.46 +42 37 34.9           ~ 32 0
26 [TGR97] VLA 2 HII 20 38 36.482 +42 37 34.08           ~ 48 0
27 [HRB81] W75N(Bb) HII 20 38 36.486 +42 37 33.44           ~ 31 0
28 [HRB81] W75N(Bc) Rad 20 38 36.533 +42 37 32.04           ~ 9 0
29 [S2001] MM 7 mm 20 38 36.56 +42 38 12.7           ~ 2 0
30 [S2001] MM 3 mm 20 38 37.05 +42 37 37.4           ~ 8 0
31 [HRB81] W75N(A) HII 20 38 37.6 +42 38 00           ~ 7 0
32 [S2001] MM 5 mm 20 38 37.78 +42 37 59.0           ~ 4 0
33 [S2001] MM 9 mm 20 38 38.70 +42 38 19.8           ~ 2 0
34 [HRB81] W75N(C) HII 20 38 39.1 +42 36 51           ~ 6 0
35 [YST88] IRS 3 * 20 38 39.1 +42 37 21           ~ 8 0
36 [DSM98] W75N NE ? 20 38 51.0 +42 38 46           ~ 3 0
37 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 974 0
38 V* PV Cep Or* 20 45 53.9537161790 +67 57 38.678052612   19.27 17.46 15.98 14.60 A5 255 3
39 3C 454.3 Bla 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2592 2
40 [STS2003] C-B ? ~ ~           ~ 1 0
41 [STS2003] C-A ? ~ ~           ~ 1 0
42 [STS2003] SW-K ? ~ ~           ~ 1 0
43 [STS2003] SW-J ? ~ ~           ~ 1 0
44 [STS2003] SW-I ? ~ ~           ~ 1 0
45 [DSM98] W75N AD ? ~ ~           ~ 1 0
46 [DSM98] W75N AC ? ~ ~           ~ 1 0
47 [STS2003] NE-I ? ~ ~           ~ 1 0
48 [STS2003] NE-H ? ~ ~           ~ 1 0
49 [STS2003] NE-G ? ~ ~           ~ 1 0
50 [STS2003] NE-F ? ~ ~           ~ 1 0
51 [STS2003] NE-E ? ~ ~           ~ 1 0
52 [DSM98] W75N SW ? ~ ~           ~ 3 0
53 [STS2003] NE-D ? ~ ~           ~ 1 0
54 [STS2003] NE-C ? ~ ~           ~ 1 0
55 [STS2003] NE-B ? ~ ~           ~ 1 0
56 [STS2003] NE-A ? ~ ~           ~ 1 0

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2021.07.31-08:16:14

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