2006ApJ...642..339S


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.29CET01:17:34

2006ApJ...642..339S - Astrophys. J., 642, 339-353 (2006/May-1)

Hubble Space Telescope NICMOS polarization measurements of OMC-1.

SIMPSON J.P., COLGAN S.W.J., ERICKSON E.F., BURTON M.G. and SCHULTZ A.S.B.

Abstract (from CDS):

We present 2 µm polarization measurements of positions in the IRc2 and BN regions of the Orion Molecular Cloud (OMC-1) made with NICMOS Camera 2 (0".2 resolution) on the Hubble Space Telescope. Our results are as follows: BN is ∼29% polarized by dichroic absorption and appears to be the illuminating source for most of the nebulosity to its north and for up to ∼5" to its south. Although the stars are probably all polarized by dichroic absorption, there are a number of compact but non-point-source objects that could be polarized by a combination of both dichroic absorption and local scattering of starlight. We identify several candidate YSOs, including an approximately edge-on bipolar YSO 8".7 east of BN, and a deeply embedded variable star. Additional strongly polarized sources are IRc2-B, IRc2-D, and IRc7, all of which are obviously self-luminous at mid-infrared wavelengths and may be YSOs. None of these is a reflection nebula illuminated by a star located near radio source I, as was previously suggested. Other IRc sources are clearly reflection nebulae: IRc3 appears to be illuminated by IRc2-B or a combination of the IRc2 sources, and IRc4 and IRc5 appear to be illuminated by an unseen star in the vicinity of radio source I, or by star n or IRc2-A. Trends in the magnetic field direction are inferred from the polarization of the 26 stars that are bright enough to be seen as NICMOS point sources. The most polarized star has a polarization position angle different from its neighbors by ∼40°, but in agreement with the grain alignment inferred from millimeter polarization measurements of the cold dust cloud in the southern part of OMC-1.

Abstract Copyright:

Journal keyword(s): Infrared: ISM - Infrared: Stars - ISM: individual (Orion BN/KL) - ISM: Magnetic Fields - Stars: Formation - Stars: Pre-Main-Sequence

Nomenclature: Table 2: [SCE2006] NN (Nos 1-26). Table 3, text: [OW94] SSs-MSS N=5.

Status at CDS:  

CDS comments: Fig.4: 143-255 is a misprint for [OW94] 143-225.

Simbad objects: 45

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Number of rows : 45

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 Parenago 1820 Y*O 05 35 13.5186502134 -05 22 19.550872932   13.1 16.160   13.254 M1.2 41 0
2 MLLA 686 * 05 35 13.650 -05 22 11.50           ~ 3 1
3 COUP 572 * 05 35 13.77462 -05 22 17.3912           ~ 14 0
4 V* V1496 Ori FU* 05 35 13.8001039312 -05 22 07.024932180   16.184 14.987   12.289 K2e-m4 48 0
5 COUP 580 * 05 35 13.8300 -05 22 09.100           ~ 11 0
6 [OW94] 139-230 * 05 35 13.9 -05 22 30           ~ 1 0
7 MLLA 602 * 05 35 13.9700 -05 22 31.900           ~ 53 0
8 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1003 2
9 MAX 55 * 05 35 14.0600 -05 22 05.700           ~ 5 0
10 Parenago 1822 *iN 05 35 14.07 -05 22 36.6     15.906   12.799 M3 46 0
11 V* V2254 Ori Or* 05 35 14.113 -05 22 22.73           B 282 2
12 [GD77] B IR 05 35 14.15 -05 22 37.4           ~ 30 0
13 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1976 1
14 [GD77] A IR 05 35 14.19 -05 22 34.0           ~ 58 0
15 [SCE2006] 9 * 05 35 14.2000 -05 22 12.990           ~ 2 0
16 MLLA 709A * 05 35 14.23 -05 22 04.0           ~ 12 0
17 [FW2011] J053514.278-052230.647 IR 05 35 14.278 -05 22 30.65           ~ 68 0
18 COUP 620 * 05 35 14.30842 -05 22 04.3874   14.0 21.31   16.227 ~ 21 1
19 [CBA97] 8 * 05 35 14.33 -05 22 25.2           ~ 13 0
20 NAME Ori N Y*O 05 35 14.35371 -05 22 32.8820           ~ 102 0
21 COUP 622 * 05 35 14.3700 -05 22 36.100     23.30     ~ 22 0
22 [RLK73] IRc 2c X 05 35 14.39867 -05 22 30.3648           ~ 22 0
23 [RLK73] IRc 2d IR 05 35 14.45 -05 22 29.9           ~ 19 0
24 [RLK73] IRc 2b IR 05 35 14.473 -05 22 29.61           ~ 20 0
25 MLLA 704 V* 05 35 14.49 -05 22 06.8   13.0 18.61   15.037 M3 21 0
26 [FRM2016] 184 X 05 35 14.5013870 -05 22 38.696699           ~ 22 0
27 [RLK73] IRc 2a Y*O 05 35 14.511 -05 22 30.40           ~ 112 0
28 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 568 1
29 [FW2011] J053514.579-052230.679 Y*O 05 35 14.579 -05 22 30.68           ~ 3 0
30 Parenago 1839 *iN 05 35 14.64 -05 22 33.7   15.891 14.779   12.008 K7 49 0
31 MLLA 572A * 05 35 14.656 -05 22 38.36           ~ 8 0
32 COUP 656 * 05 35 14.6900 -05 22 38.200           ~ 12 1
33 [SBE98] CB4 ** 05 35 14.70 -05 22 29.6           ~ 6 1
34 [OW94] 147-220 Y*O 05 35 14.7 -05 22 20           ~ 1 0
35 MLLA 587 * 05 35 14.7100 -05 22 35.500           ~ 5 0
36 ** SMN 2B * 05 35 14.7300 -05 22 29.800           ~ 7 1
37 ** SMN 2A * 05 35 14.73076 -05 22 29.8298           ~ 16 0
38 [SCE2006] 6 * 05 35 14.790 -05 22 08.91           ~ 1 0
39 MLLA 603 Ir* 05 35 14.82 -05 22 31.9   12.8 17.57   14.452 K-M: 30 1
40 COUP 661 * 05 35 14.8200 -05 22 23.200     22.10     ~ 14 0
41 V* V1330 Ori BY* 05 35 14.90 -05 22 39.2   15.040 13.940   11.632 K4 65 0
42 [OW94] 150-231 Y*O 05 35 14.98 -05 22 31.4         15.161 M6 27 0
43 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1448 1
44 M 42 HII 05 35 17.3 -05 23 28           ~ 3693 0
45 NAME Ori A MoC 05 38 -07.1           ~ 2646 0

    Equat.    Gal    SGal    Ecl

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2020.03.29-01:17:34

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