J/A+A/565/A107 Globulettes in the Carina nebula (Grenman+, 2014)
The tiny globulettes in the Carina nebula.
Grenman T., Gahm G.F.
<Astron. Astrophys., 565, A107-107 (2014)>
=2014A&A...565A.107G 2014A&A...565A.107G
ADC_Keywords: H II regions ; Globules ; Morphology
Keywords: HII regions - dust, extinction - evolution -
ISM: individual: Carina nebula
Abstract:
Small molecular cloudlets are abundant in many HII regions surrounding
newborn stellar clusters. In optical images these so-called
globulettes appear as dark silhouettes against the bright nebular
background.
We aim to make an inventory of the population of globulettes in the
Carina nebula complex, and to derive sizes and masses for comparisons
with similar objects found in other HII regions.
The globulettes were identified from Hα images collected at the
Hubble Space Telescope.
Description:
The optical images of the Carina complex were downloaded from the HST
archive, cycle 13 and 14 programs GO-10241 and 10475 (principal
investigator N. Smith) based on observations with the ACS/WFI camera,
which contains two CCDs of 2048x4096 pixels glued together with a
small gap in between. The pixel size corresponds to ∼0.05 arcsec/pix,
and the field of view is 202x202 arcsec. All images selected were
exposed for 1000 s through the narrow-band filter F658N, covering the
nebular emission lines of Hα and [NII].
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 84 288 List of globulettes in the Carina nebula complex
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See also:
J/AJ/133/1795 : Globulettes in four HII regions (Gahm+, 2007)
J/A+A/567/A108 : Rosette globulettes and shells in the IR (Makela+, 2014)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- CN [1/288] Globulette sequential number
5- 11 A7 --- Field Field designation (F1 to F48)
12- 15 I4 pix Xpos X position
17- 20 I4 pix Ypos Y position
22- 23 I2 h RAh Right ascension (J2000)
25- 26 I2 min RAm Right ascension (J2000)
28- 31 F4.1 s RAs Right ascension (J2000)
33 A1 --- DE- Declination sing (J2000)
34- 35 I2 deg DEd Declination (J2000)
37- 38 I2 arcmin DEm Declination (J2000)
40- 41 I2 arcsec DEs Declination (J2000)
43- 46 F4.2 arcsec alpha [0.08/2.3] Semi-minor axis α
48- 51 F4.2 arcsec beta [0.09/3.0] Semi-major axis β
53- 55 I3 deg PA [-45/45]? Position angle for elongated objects
(β/α>1.5)
57- 60 F4.2 kAU rc Characteristic radius, r{bar}
(mean of the semi-major and semi-minor axes,
adopting a distance to Carina of 2.9kpc)
62- 66 F5.1 Mjup Mass Globulette mass
67 A1 --- l_Mass [*] * indicates a lower limit for Mass
69- 75 A7 --- Notes Notes (1)
77- 84 A8 --- Rem Remarks (2)
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Note (1): Notes include:
EL = Elongated globulette
T = Object have developed tails or tear-drop forms
BR = Object with pronounced bright rims
BH = Object with bright halos
Note (2): Remarks include the abbreviations:
C = Object is connected by a dark, thin filament to a larger
structure, like a nearby trunk; "C to NN" designates the other
globulette to which the source is linked.
S = Objects noted in Smith et al. (2003ApJ...587L.105S 2003ApJ...587L.105S) followed
by the symbol they used:
Se = [SBM2003] J104339.1-593257 and [SBM2003] J104339.8-593247
Sf = [SBM2003] J104402.8-593209, [SBM2003] J104402.3-593214,
and [SBM2003] J104402.5-593218
Si = [SBM2003] J104359.6-593238
HH = HH candidates recognized in Smith et al. (2010MNRAS.405.1153S 2010MNRAS.405.1153S)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 10-Sep-2014