J/MNRAS/367/513 JHKs[3.5][4.5] photometry of NGC 3372 (Tapia+, 2006)
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., Gomez M.
<Mon. Not. R. Astron. Soc., 367, 513-526 (2006)>
=2006MNRAS.367..513T 2006MNRAS.367..513T (SIMBAD/NED BibCode)
ADC_Keywords: H II regions ; Molecular clouds ; Photometry, infrared
Keywords: stars: formation - dust, extinction - H II regions -
ISM: jets and outflows - infrared: stars
Abstract:
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/Infra-Red 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.
Description:
The narrow-band optical images in several of the most important atomic
lines and neighbouring continuum were secured at Las Campanas
Observatory (LCO) in 1994 March 17-22, using the 40-in. telescope
(LCO-40) and the TEK1 1024x1024 pixel detector. The narrow-band
filters are centred in the following emission lines: Hβ, [OIII]
5007Å, Hα, [NII] 6584Å and [SII] 6731Å. Additionally,
a filter centred at 6724Å lets through both lines of the [SII]
doublet. Continuum images were taken with filters centred at 3792,
4772, 5954 and 6253Å.
The near-infrared images were obtained during two runs, with the Clay
and Baade Magellan telescopes and Persson's Auxiliary Nasmyth Infrared
Camera (PANIC) attached. The JHK frames were obtained in 2003 May 17
on the Clay telescope.
In 2004 April 2, a quick survey of a small region of size
40x30arcsec2 (fully sampled region) centred at RA=10:43:26.7,
DE=-59:34:37 (J2000) was performed at 8.9m (0.78m FWHM), 9.8m (0.93m
FWHM) and 11.9m (1.16m FWHM) with TIMMI2 on the European Southern
Observatory (ESO) 3.6-m telescope at La Silla.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 74 72 Coordinates and photometry of sources with
infrared excess.
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See also:
J/MNRAS/355/1237 : JHKs photometry of G287.84-0.82 members (Hagele+, 2004)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [TPB2006] Sequential number
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 15 F5.2 s RAs Right ascension (J2000)
17 A1 --- DE- Declination sign (J2000)
18- 19 I2 deg DEd Declination (J2000)
21- 22 I2 arcmin DEm Declination (J2000)
24- 27 F4.1 arcsec DEs Declination (J2000)
29- 33 F5.2 mag Ksmag Ks magnitude
35- 38 F4.2 mag H-Ks ? H-Ks colour index
40- 43 F4.2 mag J-H ? J-H colour index
45- 49 F5.2 mag [3.6]mag ? Magnitude at 3.6um
50- 51 A2 --- u_[3.6]mag [: ] Uncertainty flag on [3.6]mag
53- 57 F5.2 mag [4.5]mag ? Magnitude at 4.5um
58- 59 A2 --- u_[4.5]mag [: ] Uncertainty flag on [4.5]mag
60 A1 --- n_[4.5]mag [cd] Note on [3.6] and [4.5] magnitudes (1)
61- 74 A14 --- Rem Remarks (2)
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Note (1): Note as follows:
c = #106 and #110 IRAC magnitudes combined
d = #105 and #108 IRAC magnitudes combined
Note (2): Remarks as follows:
xrs = Chandra X-ray source (Townsley et al. 2005, IAU Symp., 227, 311)
lexc = [3.6]-band excess
I = Group I. Eight stars which are relatively bright in J, show low
reddening and near-infrared colour indices that imply early
spectral types (<A5) with slight Ks-band excesses (Sect. 3.1)
II = Group II. 23 stars with moderate extinction have JHKs colours
that suggest A to early-K spectral types and moderate to small
excess emission at λ>2um. (Sect. 3.1)
III = Group III. Highly reddened mid- and low-mass embedded stellar
objects. This subsample is consisting of 33 sources. (Sect. 3.1)
IV = Group IV. This group is composed of 20 medium to highly reddened
massive YSOs. (Sect. 3.1)
V = Group V. Nine highly reddened, massive young stellar objects with
large near-infrared excesses. (Sect. 3.2)
* = close pair of mid-IR sources
** = within extended, nebulous emission in all IRAC bands
*** = very faint at 3.5 and 4.5um
a = IRAC [5.8]=9.48::, [8]=8.02:
b = IRAC [6.8]=5.80, [8]=4.94
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History:
From electronic version of the journal
References:
Tapia et al., Paper I 2003MNRAS.339...44T 2003MNRAS.339...44T
(End) Patricia Vannier [CDS] 26-Sep-2006