2003AJ....125.2108P

Query : 2003AJ....125.2108P

2003AJ....125.2108P - Astron. J., 125, 2108-2122 (2003/April-0)

Looking into the Horsehead.

POUND M.W., REIPURTH B. and BALLY J.

Abstract (from CDS):

We present the first interferometric CO (1-0) map of the Horsehead Nebula, made with the Berkeley-Illinois-Maryland Association array. The map has an angular resolution of about 10", corresponding to about 0.02 pc. The CO form of the Horsehead closely matches its appearance in visible dust, with the CO emission dominated by a bright, thin ridge along its western side. The molecular cloud exhibits a pronounced velocity gradient of 5 km/s/pc from the northeast to the southwest, with the southwestern portion being redshifted. The mass of the cloud is 27 M☉. We find an unusual U-shaped feature aligned with the ``horse's nose'' for which we discuss several interpretations. The northern portion of the U may trace a small outflow driven by the embedded young star B33-1. We discuss the formation, evolution, and ultimate fate of this well-known nebula.

Abstract Copyright: ∼

Journal keyword(s): ISM: Clouds - ISM: Globules - ISM: individual (Horsehead Nebula) - ISM: Kinematics and Dynamics - Stars: Formation

Nomenclature: Fig.11: [PRB2003] Source N (Nos 1-4).

CDS comments: Stars B33-1, B33-3, B33-4, B33-6 = [RB84] B33-1, 3, 4, 6 in SIMBAD. Paragr. 2, phase calibrator 0530-135 not identified.

Simbad objects: 16

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Number of rows : 16
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 * sig Ori Y*O 05 38 44.7653828520 -02 36 00.283179888 2.54 3.58 3.79 3.87 4.11 O9.5V+B0.2V(n) 855 0
2 IRAS 05383-0228 Y*O 05 40 51.7279052040 -02 26 49.011928224         14.38 ~ 28 0
3 IRAS 05384-0229 FIR 05 40 56.8 -02 27 46           ~ 6 0
4 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 555 0
5 IC 434 HII 05 41 -02.5           ~ 97 1
6 IRAS 05386-0229 IR 05 41 11.2 -02 28 11           ~ 7 0
7 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 715 1
8 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1498 0
9 LDN 1630 DNe 05 45.5 -00 59           ~ 392 0
10 [B2001b] IRS 1 Y*O 12 01 36.53040 -65 08 51.9180           ~ 167 0
11 BHR 71 MoC 12 01 37 -65 08.8           ~ 163 0
12 NAME BHR 71 MM HII 12 01 37.1 -65 08 54           ~ 47 0
13 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
14 [RB84] B33-3 * ~ ~           ~ 1 0
15 [RB84] B33-6 * ~ ~           ~ 1 0
16 [RB84] B33-4 * ~ ~           ~ 1 0

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