J/ApJ/646/1009 Structures of dust in Perseus molecular cloud (Kirk+, 2006)
The large- and small-scale structures of dust in the star-forming
Perseus molecular cloud.
Kirk H., Johnstone D., Di Francesco J.
<Astrophys. J., 646, 1009-1023 (2006)>
=2006ApJ...646.1009K 2006ApJ...646.1009K
ADC_Keywords: Molecular clouds ; Millimetric/submm sources
Keywords: ISM: clouds - stars: formation
Abstract:
We present an analysis of 3.5deg2 of submillimeter continuum and
extinction data of the Perseus molecular cloud. We identify 58 clumps
in the submillimeter map, and we identify 39 structures (cores) and 11
associations of structures (super cores) in the extinction map. The
cumulative mass distributions of the submillimeter clumps and
extinction cores have steep slopes (alpha∼2 and 1.5-2, respectively),
steeper than the Salpeter initial mass function (IMF; alpha=1.35),
while the distribution of extinction super cores has a shallow slope
(alpha∼1). Most of the submillimeter clumps are well fit by stable
Bonnor-Ebert spheres with 10K<T<19K and 5.5<log10(Pext/k)<0.6. The
clumps are found only in the highest column density regions
(AV>5-7mag), although Bonnor-Ebert models suggest that we should have
been able to detect them at lower column densities if they exist.
Description:
Submillimeter data at 850um of the Perseus molecular cloud were
obtained using the Submillimeter Common User Bolometer Array (SCUBA)
on the James Clerk Maxwell Telescope (JCMT) on Mauna Kea.4 The data we
present here are a combination of our own observations (∼1.3deg2)
with publicly available archival data for a total of 3.5deg2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 85 58 Properties of Submillimeter Clumps in Perseus
table2.dat 59 39 Properties of Extinction Cores in Perseus
table3.dat 49 11 Properties of Extinction Super Cores in Perseus
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See also:
J/ApJ/638/293 : 1.1mm sources in the Perseus Molecular Cloud (Enoch+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- SMM Name from J2000 positions (HHMMSS+DDMMm)
[KJD2006] SMM JHHMMmm+DDMMm in Simbad
14- 15 I2 h RAh Peak flux right ascension (J2000) (1)
17- 18 I2 min RAm Peak flux right ascension (J2000) (1)
20- 23 F4.1 s RAs Peak flux right ascension (J2000) (1)
25 A1 --- DE- Peak flux declination sign (J2000) (1)
26- 27 I2 deg DEd Peak flux declination (J2000) (1)
29- 30 I2 arcmin DEm Peak flux declination (J2000) (1)
32- 35 F4.1 arcsec DEs Peak flux declination (J2000) (1)
37- 41 F5.2 Jy f0 Peak flux at 850um (in Jy/beam)
43- 47 F5.2 Jy S850um Total flux at 850um (2)
49- 52 F4.1 arcsec Reff Radius derived from clfind (Williams et al.
1994, Cat. J/ApJ/428/693)
54- 56 F3.1 solMass Mass Mass derived from the total flux assuming
Td=15K and k850=0.02cm2/g, d=250pc
58- 61 F4.2 --- Conc Concentration from Bonnor-Ebert modeling
63- 66 F4.1 K Temp Temperature from Bonnor-Ebert modeling
68- 71 F4.2 solMass MBE Mass from Bonnor-Ebert modeling
73- 75 F3.1 [cm-3] logNc Central number density from Bonnor-Ebert
modeling
77- 79 F3.1 [cm-3.K] logP/k External pressure derived from Bonnor-Ebert
modeling, log(Pext/k)
81- 82 I2 --- [HRF2005] ? Best corresponding submillimeter clump in
Hatchell et al. (2005, Cat. J/A+A/440/151)
number (3)
84- 85 I2 --- EC Closest corresponding extinction core number,
[KJD2006] EC NN in Simbad, in table2
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Note (1): Position of peak flux within clump (accurate to 6").
Note (2): Note a beam size of 19.9" is used for the peak flux.
Note (3): More clumps were identified in their survey, as discussed in
Section 4.1.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- EC Identification number,
[KJD2006] EC NN in Simbad
4- 5 I2 h RAh Peak flux right ascension (J2000) (1)
7- 8 I2 min RAm Peak flux right ascension (J2000) (1)
10- 13 F4.1 s RAs Peak flux right ascension (J2000) (1)
15 A1 --- DE- Peak flux declination sign (J2000) (1)
16- 17 I2 deg DEd Peak flux declination (J2000) (1)
19- 20 I2 arcmin DEm Peak flux declination (J2000) (1)
22- 25 F4.1 arcsec DEs Peak flux declination (J2000) (1)
27- 29 F3.1 --- AVpeak Peak extinction (2)
31- 33 F3.1 --- AVbg Background extinction (2)
35- 39 F5.1 solMass Mass Mass (2)
41- 45 F5.1 arcsec sigmax sigmax (2)
47- 51 F5.1 arcsec sigmay sigmay (2)
53- 56 F4.1 10+3cm-3 Mean number density (2)
58- 59 I2 --- ESC Associated extinction super core,
[KJD2006] ESC NN in Simbad, in table3
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Note (1): Position of peak extinction within core (accurate to 2.5').
Note (2): From results of Gaussian fitting
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- ESC Identification number,
[KJD2006] ESC NN in Simbad
4- 5 I2 h RAh Peak flux right ascension (J2000) (1)
7- 8 I2 min RAm Peak flux right ascension (J2000) (1)
10- 13 F4.1 s RAs Peak flux right ascension (J2000) (1)
15 A1 --- DE- Peak flux declination sign (J2000) (1)
16- 17 I2 deg DEd Peak flux declination (J2000) (1)
19- 20 I2 arcmin DEm Peak flux declination (J2000) (1)
22- 25 F4.1 arcsec DEs Peak flux declination (J2000) (1)
27- 30 F4.1 --- AVpeak Peak extinction (2)
32- 37 F6.1 solMass Mass Mass from results (2)
39- 44 F6.1 arcsec Reff Effective radius (2)
46- 49 F4.1 10+3cm-3 Mean number density (2)
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Note (1): Position of peak extinction within core (accurate to 2.5').
Note (2): Derived from Clumpfind (Williams et al. 1994, Cat. J/ApJ/428/693)
with several clumps further separated.
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History:
From electronic version of the journal
Tables 1 and 2 are taken from erratum Vol. 669, p. 657 (2007).
(End) Patricia Vannier [CDS] 09-May-2008