J/ApJ/686/948 CO in extragalactic giant molecular clouds (Bolatto+, 2008)
The resolved properties of extragalactic giant molecular clouds.
Bolatto A.D., Leroy A.K., Rosolowsky E., Walter F., Blitz L.
<Astrophys. J., 686, 948-965 (2008)>
=2008ApJ...686..948B 2008ApJ...686..948B
ADC_Keywords: Molecular clouds ; Magellanic Clouds ; Milky Way ; Radio lines
Keywords: galaxies: dwarf - galaxies: individual (IC 10, M31, M33, NGC 185,
NGC 205, NGC 1569, NGC 2976, NGC 3077, NGC 4214, NGC 4449, NGC 4605) -
galaxies: ISM - ISM: clouds - Magellanic Clouds
Abstract:
We use high spatial resolution observations of CO to systematically
measure the resolved size-line width, luminosity-line width,
luminosity-size, and mass-luminosity relations of GMCs in a variety of
extragalactic systems. Although the data are heterogeneous, we analyze
them in a consistent manner to remove the biases introduced by limited
sensitivity and resolution, thus obtaining reliable sizes, velocity
dispersions, and luminosities. We compare the results obtained in
dwarf galaxies with those from the Local Group spiral galaxies. We
find that extragalactic GMC properties measured across a wide range of
environments are very much compatible with those in the Galaxy. The
property that shows the largest variability is their resolved
brightness temperature, although even that is similar to the average
Galactic value in most sources.
Description:
We use data from four telescopes: the Berkeley-Illinois-Maryland
Association (BIMA), Caltech's Owens Valley Radio Observatory (OVRO)
millimeter array, the Institut de Radioastronomie Millimetrique
Plateau de Bure Interferometer (PdBI), and the Swedish-ESO
Submillimeter Telescope (SEST). We measure GMC properties in 11 dwarf
galaxies: the LMC and SMC, IC 10, NGC 185, NGC 205, NGC 1569, NGC
2976, NGC 3077, NGC 4214, NGC 4449, and NGC 4605. Table 1 gives the
references for each data set.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 39 18 Data sets used in this paper
table3.dat 99 183 Radio observations
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See also:
B/iram : Plateau de Bure Interferometer Observation Log (IRAM 1991-2010)
J/ApJS/178/56 : CO observations of LMC Giant Molecular clouds (Fukui+, 2008)
J/ApJ/654/240 : Giant molecular clouds in M31 (Rosolowsky+, 2007)
J/ApJ/661/830 : Giant molecular clouds of M33 (Rosolowsky+, 2007)
J/ApJS/149/343 : Giant molecular clouds in M33 (Engargiola+, 2003)
J/PASJ/53/971 : CO catalog of LMC molecular clouds (Mizuno+, 2001)
J/A+AS/115/439 : CO survey of galaxies (Elfhag+, 1996)
J/A+AS/116/157 : SEST obs. of extragalactic radiosources (Tornikoski+, 1996)
J/A+A/295/585 : CO observations in NGC 1365 (Sandqvist+, 1995)
J/A+A/276/25 : ESO-SEST Key Program on CO in LMC and SMC (Israel+ 1993)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Gal Source name
12- 16 A5 --- Tel Instrument designation
18- 20 A3 --- Trans1 First transition observed
21 A1 --- --- [,]
22- 24 A3 --- Trans2 Second transition observed
26- 28 I3 pc Res1 First resolution in parsecs
29 A1 --- --- [,-]
30- 31 I2 pc Res2 ? Second resolution in parsecs
33- 36 F4.2 km/s Resv Resolution in velocity
38- 39 I2 --- Ref Reference number (1)
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Note (1): References as follows:
1 = Walter 2004dimg.conf..159W; Leroy et al. 2006ApJ...643..825L 2006ApJ...643..825L;
2 = Young 2001AJ....122.1747Y 2001AJ....122.1747Y;
3 = Bolatto et al. 2003ApJ...595..167B 2003ApJ...595..167B;
4 = Rubio et al. 1993A&A...271....1R 1993A&A...271....1R;
5 = Bolatto et al. 2000ApJ...545..234B 2000ApJ...545..234B;
6 = Taylor et al. 1999A&A...349..424T 1999A&A...349..424T;
7 = Simon et al. 2003ApJ...596..957S 2003ApJ...596..957S;
8 = this paper;
9 = Walter et al. 2002AJ....123..225W 2002AJ....123..225W;
10 = Walter et al. 2001AJ....121..727W 2001AJ....121..727W;
11 = Bolatto et al. 2002ApJ...565..238B 2002ApJ...565..238B;
12 = Sanders et al. 1986ApJS...60....1S 1986ApJS...60....1S;
13 = Rosolowsky 2007, Cat. J/ApJ/654/240;
14 = Rosolowsky et al. 2003ApJ...599..258R 2003ApJ...599..258R.
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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- 4 A4 --- Tel Telescope facility
6- 15 A10 --- Gal Galaxy observed
17- 18 I2 --- Seq Giant Molecular Cloud number in Gal (1)
20- 23 A4 --- Trans CO transition
25- 26 I2 h RAh Hour of Right Ascension (J2000) (2)
28- 29 I2 min RAm Minute of Right Ascension (J2000) (2)
31- 34 F4.1 s RAs Second of Right Ascension (J2000) (2)
36 A1 --- DE- Sign of the Declination (J2000) (2)
37- 38 I2 deg DEd Degree of Declination (J2000) (2)
40- 41 I2 arcmin DEm Arcminute of Declination (J2000) (2)
43- 46 F4.1 arcsec DEs Arcsecond of Declination (J2000) (2)
48- 53 F6.1 km/s VLSR Cloud mean Local Standard of Rest velocity
55- 58 F4.2 [pc] logR ? Log of cloud radius
60- 63 F4.2 [pc] e_logR ? Uncertainty in logR
65- 69 F5.2 [km/s] logS Log of cloud line of sight velocity dispersion
71- 74 F4.2 [km/s] e_logS Uncertainty in logS
76- 79 F4.2 [Msun] logMl Log of cloud luminous mass from Equ. 5 (3)
81- 84 F4.2 [Msun] e_logMl Uncertainty in logMl
86- 89 F4.2 [Msun] logMv ? Log of cloud virial mass from Equ. 7 (4)
91- 94 F4.2 [Msun] e_logMv ? Uncertainty in logMv
96- 99 F4.1 K TB Peak cloud brightness temperature
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Note (1): GMCs are <[BLR2008] Gal NN> in Simbad.
Note (2): Of the intensity-weighted cloud center.
Note (3): Mlum=1.1x104SCOD2M☉ where
SCO≡∫ICOdΩdv is the integrated 12CO flux of the
molecular cloud measured in Jy.km/s, and D is the distance to the
source in Mpc. See section 3.4 for further details.
Note (4): Mvir=1040σ2νRM☉ where σν is the cloud
velocity dispersion in km/s, R is the spherical cloud radius in pc,
and Mvir is the cloud virial mass in M☉.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 05-Jan-2011