2006MNRAS.367..513T

Query : 2006MNRAS.367..513T

2006MNRAS.367..513T - Mon. Not. R. Astron. Soc., 367, 513-526 (2006/April-1)

Imaging study of NGC 3372, the Carina nebula - II. Evidence of activity in the complex Trumpler 14/Car I photodissociation region.

TAPIA M., PERSI P., BOHIGAS J., ROTH M. and GOMEZ M.

Abstract (from CDS):

We present the results of an imaging survey, from the optical to the mid-infrared, of the dark cloud associated with Car I, a dense cloud that is subject to an intense ultraviolet radiation field from the rich stellar cluster Trumpler 14. New ground-based broad- and narrow-band near-infrared and narrow-band optical images are analysed in combination with archived Spitzer/InfraRed Array Camera (IRAC) images to study this photodissociation region (PDR) and the triggering of a new generation of stars within the cloud, particularly close to its edges. Evidence is given of a clumpy morphology of the dense cloud. The ionization/dissociation front is delineated at the edges of these clumps. The existence of a number of embedded low- to intermediate-mass pre-main-sequence objects is confirmed by their considerable infrared excesses arising from discs and/or detectable X-ray emission. Most of the young stellar objects (YSOs) are located on or just behind ionization fronts, though a few are also outside the cloud. The infrared properties of the YSOs are discussed. Two Class I objects stand out, one of them is an FU Orionis system candidate that had an outburst of more than 3mag in K between 1993 and 2003, with further evidence that it occurred in the 2000-02 period. Molecular hydrogen line filamentary emission behind the Balmer and Brackett lines along the ionization front is seen delineating the edges of the dense cloud. This emission is also seen in all IRAC images. The diffuse, filamentary emission is very similar in all four 3.6, 4.5, 5.8 and 8µm bands, though there seem to be subtle differences. Across a bright section of the ionization/dissociation front, we found that, within the observational uncertainties, the maximum emission in all four IRAC channels coincides with that of H22.12µm. The western, embedded, dissociation front close to the CO peak (Car I-W) is seen delineated by a bright, long bar of emission in the 3-12µm images, in the Midcourse Space Experiment bands A and C and also in radio continuum and hydrogen line emission. These occur in the vicinity of a region of previously reported strong [Ci], [CII] and [OI] emission, tracers of PDRs. A few bright, compact knots of H2emission, some possibly associated with [SII] emission, are found within the cloud. These may be shock-excited.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): stars: formation - dust, extinction - HII regions - ISM: jets and outflows - infrared: stars

VizieR on-line data: <Available at CDS (J/MNRAS/367/513): table2.dat>

Nomenclature: Table 2: [TPB2006] NNN N=72 among 240. Fig.3, Table 3: [TPB2006] knot A (Nos A-E).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 17

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Number of rows : 17
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 Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 1004 0
2 [W94d] Car I-W Rad 10 43 21.4 -59 34 27           ~ 10 0
3 [TPB2006] knot C NIR 10 43 21.8 -59 34 34           ~ 1 0
4 [TPB2006] knot B NIR 10 43 23.9 -59 33 53           ~ 1 0
5 [TPB2006] knot D NIR 10 43 26.9 -59 34 17           ~ 1 0
6 [TPB2006] knot A NIR 10 43 27.4 -59 34 17           ~ 1 0
7 [TPB2006] knot E NIR 10 43 28.9 -59 33 59           ~ 1 0
8 NAME Carina I HII Region HII 10 43 32 -59 35.0           ~ 59 0
9 CD-58 3524 s*b 10 43 33.3506407920 -59 35 11.148512172 10.084 10.583 10.074 10.09 9.218 B1Ia 38 0
10 HD 93128 SB* 10 43 54.3957741024 -59 32 57.497266716 8.82 8.97 8.77 9.40 8.71 O3.5V((fc))z 112 1
11 Cl Trumpler 14 OpC 10 43 56.0 -59 33 07   5.70 5.5     ~ 547 0
12 HD 93129 ** 10 43 57.462360 -59 32 51.27000 6.26 7.840 7.884 7.839   O2If*+O3.5V((f)) 208 1
13 HD 93129B Y*? 10 43 57.6453994104 -59 32 53.765064780   10.40 8.84     O3.5V((f)) 78 0
14 Cl Collinder 228 OpC 10 44 00 -60 05.2           ~ 211 0
15 Cl Trumpler 15 OpC 10 44 43.6 -59 22 07           ~ 229 0
16 Cl Trumpler 16 OpC 10 45 01.9 -59 42 00           ~ 510 0
17 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1071 2

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