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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 39 18 Data sets used in this paper table3.dat 99 183 Radio observations
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
Bytes Format Units Label Explanations
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)
Note (1): References as follows: 1 = Walter 2004dimg.conf..159W; Leroy et al. 2006ApJ...643..825L; 2 = Young 2001AJ....122.1747Y; 3 = Bolatto et al. 2003ApJ...595..167B; 4 = Rubio et al. 1993A&A...271....1R; 5 = Bolatto et al. 2000ApJ...545..234B; 6 = Taylor et al. 1999A&A...349..424T; 7 = Simon et al. 2003ApJ...596..957S; 8 = this paper; 9 = Walter et al. 2002AJ....123..225W; 10 = Walter et al. 2001AJ....121..727W; 11 = Bolatto et al. 2002ApJ...565..238B; 12 = Sanders et al. 1986ApJS...60....1S; 13 = Rosolowsky 2007, Cat. J/ApJ/654/240; 14 = Rosolowsky et al. 2003ApJ...599..258R.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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
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☉.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 05-Jan-2011
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