2010ApJ...708.1002F


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST16:10:43

2010ApJ...708.1002F - Astrophys. J., 708, 1002-1024 (2010/January-2)

The initial conditions of clustered star formation. II. N2H+ observations of the Ophiuchus B core.

FRIESEN R.K., DI FRANCESCO J., SHIMAJIRI Y. and TAKAKUWA S.

Abstract (from CDS):

We present a Nobeyama 45 m Radio Telescope map and Australia Telescope Compact Array pointed observations of N2H+ 1-0 emission toward the clustered, low-mass star-forming Oph B Core within the Ophiuchus molecular cloud. We compare these data with previously published results of high-resolution NH3 (1,1) and (2,2) observations in Oph B. We use 3D CLUMPFIND to identify emission features in the single-dish N2H+ map, and find that the N2H+ "clumps" match well similar features previously identified in NH3(1,1) emission, but are frequently offset to clumps identified at similar resolution in 850 µm continuum emission. Wide line widths in the Oph B2 sub-Core indicate that non-thermal motions dominate the Core kinematics, and remain transonic at densities n ∼ 3x105/cm3 with large scatter and no trend with N(H2). In contrast, non-thermal motions in Oph B1 and B3 are subsonic with little variation, but also show no trend with H2 column density. Over all of Oph B, non-thermal N2H+ line widths are substantially narrower than those traced by NH3, making it unlikely NH3 and N2H+ trace the same material, but the vLSR of both species agree well. We find evidence for accretion in Oph B1 from the surrounding ambient gas. The NH3/N2H+ abundance ratio is larger toward starless Oph B1 than toward protostellar Oph B2, similar to recent observational results in other star-forming regions. The interferometer observations reveal small-scale structure in N2H+ 1-0 emission, which are again offset from continuum emission. No interferometric N2H+ emission peaks were found to be coincident with continuum clumps. In particular, the ∼1 MB2-MM8 clump is associated with an N2H+ emission minimum and surrounded by a broken ring-like N2H+ emission structure, suggestive of N2H+ depletion. We find a strong general trend of decreasing N2H+ abundance with increasing N(H2) in Oph B which matches that found for NH3.

Abstract Copyright:

Journal keyword(s): ISM: kinematics and dynamics - ISM: molecules - ISM: structure - radio lines: ISM - stars: formation

Nomenclature: Table 2: [FDS2010] BNN-NN (Nos B1-N1 to B1-N4, B12-N1 to B12-N3, B2-N1 to B2-N9, B3-N1).

Simbad objects: 57

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Number of rows : 57

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 Bol 68 GlC 00 42 03.2026147801 +40 58 50.143293337 18.291 17.497 16.318 15.562 14.794 ~ 49 0
2 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 561 0
3 NAME [BM89] L1498 PoC 04 10 51.4 +25 09 58           ~ 187 0
4 LDN 1498 DNe 04 11.0 +24 58           ~ 250 0
5 NAME [BM89] L1521B cor 04 24 12.7 +26 36 53           ~ 62 0
6 LDN 1551 DNe 04 31 30.0 +18 12 30           ~ 772 1
7 NAME [BM89] L1517B cor 04 55 18.8 +30 38 04           ~ 130 0
8 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 703 0
9 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 434 1
10 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2727 2
11 V* RS Lib Mi* 15 24 19.7909563744 -22 54 39.822052678   10.59 7.00     M7-8e 118 0
12 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 689 1
13 NAME rho Oph A Cloud MoC 16 26 26.4 -24 22 33           ~ 241 1
14 NAME rho Oph A SM 1 cor 16 26 27.60 -24 23 55.0           ~ 59 0
15 NAME rho Oph C Cloud MoC 16 26 53.1 -24 32 31           ~ 57 0
16 NAME rho Oph E MoC 16 27 02.0 -24 38 31           ~ 56 0
17 NAME rho Oph Cloud B1 PoC 16 27 10.5 -24 29 30           ~ 51 1
18 NAME rho Oph B Cloud MoC 16 27 11 -24 28.5           ~ 67 1
19 [FDS2010] B1-N1 cor 16 27 13.10 -24 29 40.3           ~ 1 0
20 [FDS2010] B12-N1 cor 16 27 13.50 -24 28 10.1           ~ 1 0
21 [FDS2010] B1-N2 cor 16 27 14.20 -24 29 15.3           ~ 1 0
22 [FDS2010] B1-N3 cor 16 27 15.30 -24 30 20.5           ~ 1 0
23 [FDS2010] B12-N2 cor 16 27 15.30 -24 27 50.1           ~ 1 0
24 [FDS2010] B1-N4 cor 16 27 16.40 -24 30 30.5           ~ 1 0
25 [FDS2010] B12-N3 cor 16 27 19.00 -24 27 20.0           ~ 1 0
26 NAME rho Oph B3 Cloud MoC 16 27 20 -24 24.5           ~ 8 1
27 [FDS2010] B2-N1 cor 16 27 21.60 -24 27 45.1           ~ 1 0
28 [FDS2010] B3-N1 cor 16 27 22.00 -24 24 54.7           ~ 2 0
29 [FDS2010] B2-N2 cor 16 27 24.90 -24 27 15.0           ~ 1 0
30 [FDS2009] B2-A5 cor 16 27 25.00 -24 26 55.0           ~ 2 0
31 NAME rho Oph B2 Cloud PoC 16 27 27.9 -24 26 29           ~ 75 1
32 [SSG2006] MMS016 cor 16 27 28.1 -24 27 11           ~ 22 0
33 [FDS2010] B2-N3 cor 16 27 28.20 -24 27 40.1           ~ 1 0
34 Elia 2-32 Y*O 16 27 28.44576 -24 27 21.0348           K6.5 104 1
35 [FDS2010] B2-N4 cor 16 27 28.60 -24 26 40.0           ~ 2 0
36 [FDS2009] B2-A6 cor 16 27 29.00 -24 26 59.0           ~ 2 0
37 [FDS2010] B2-N5 cor 16 27 29.15 -24 27 02.0           ~ 4 0
38 JCMTLSG J162729.5-242739 Y*O 16 27 29.6 -24 27 37           ~ 14 0
39 Elia 2-33 Y*O 16 27 30.18024 -24 27 43.3656           M2 109 1
40 [FDS2010] B2-N6 cor 16 27 32.30 -24 27 00.0           ~ 2 0
41 [FDS2009] B2-A7 cor 16 27 32.50 -24 26 57.0           ~ 4 0
42 [MAN98] B2-MM15 cor 16 27 32.8 -24 27 03           ~ 12 0
43 [FDS2009] B2-A8 cor 16 27 32.80 -24 26 17.0           ~ 2 0
44 [FDS2010] B2-N7 cor 16 27 33.00 -24 27 40.1           ~ 1 0
45 [JJK2008] SMM J162733-24262 smm 16 27 33.00 -24 26 22.3           ~ 3 0
46 [FDS2010] B2-N8 cor 16 27 33.40 -24 27 45.1           ~ 1 0
47 [FDS2009] B2-A9 cor 16 27 33.50 -24 27 43.0           ~ 2 0
48 [YEE2006] 21 cor 16 27 33.5 -24 26 20           ~ 10 0
49 [FDS2009] B2-A10 cor 16 27 33.80 -24 26 14.9           ~ 2 0
50 [FDS2010] B2-N9 cor 16 27 34.50 -24 26 04.9           ~ 1 0
51 [MAN98] B2-MM16 cor 16 27 35.04 -24 26 16.8           ~ 9 0
52 NAME rho Oph F MoC 16 27 37.3 -24 42 28           ~ 58 0
53 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3063 0
54 V* AF Sco Mi* 16 50 25.5987983410 -25 33 37.750634408           M9III 17 1
55 NAME Serpens Cluster Cl* 18 29 57 +01 14.4           ~ 59 0
56 IRAS 20293+3952 HII 20 31 11.040 +40 03 10.69           ~ 67 0
57 NAME Gould Belt PoG ~ ~           ~ 723 1

    Equat.    Gal    SGal    Ecl

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2020.10.21-16:10:43

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