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J/ApJ/670/428       Bubbles in the galactic disk. II.       (Churchwell+, 2007)

The bubbling galactic disk. II. The inner 20°. Churchwell E., Watson D.F., Povich M.S., Taylor M.G., Babler B.L., Meade M.R., Benjamin R.A., Indebetouw R., Whitney B.A. <Astrophys. J., 670, 428-441 (2007)> =2007ApJ...670..428C
ADC_Keywords: Galactic plane; H II regions; Morphology Keywords: H II regions - ISM: bubbles - stars: formation Abstract: We report 269 mid-infrared bubbles within 10° of the Galactic center from visual inspection of the Spitzer GLIMPSE II Legacy Science program images. The surface density of bubbles is ∼5deg-2 or about 3 times that detected in longitudes |l|=10°-65°, because the inner 10° of longitude were more thoroughly searched for small bubbles. There is a gradient in the number of bubbles with longitude with an increase of about a factor of 2 from 2° to 10°; this is probably the result of several factors, including decreasing diffuse background brightness, confusion, and opacity with longitude. Bubble eccentricities are typically between 0.6 and 0.8, and >50% show evidence for blowouts, which we suggest result from local density fluctuations of the ISM and/or anisotropic stellar winds and radiation fields. Description: In addition to the GI and GII data, Susan Stolovy has given us permission to include her Spitzer/IRAC survey of an area of 0.75°x0.75° centered on the Galactic center (PID 3677 GO program). The properties of the image mosaics from which bubbles were identified have been described in Paper I, Churchwell et al., 2006, Cat. J/ApJ/649/759. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 73 151 Northern Bubble parameters table2.dat 73 118 Southern Bubble parameters
See also: J/ApJ/649/759 : The bubbling galactic disk. I (Churchwell+, 2006) Byte-by-byte Description of file: table?.dat
Bytes Format Units Label Explanations
1- 6 A6 --- [CWP2007] Catalog name, CN NNN or CS NNN (1) 8- 14 F7.3 deg GLON Galactic longitude of center position 16- 21 F6.3 deg GLAT Galactic latitude center position 23- 26 F4.2 arcmin Rin Semimajor axis of the inner ellipse 28- 31 F4.2 arcmin rin Semiminor axis of the inner ellipse 33- 37 F5.2 arcmin Rout Semimajor axis of the outer ellipse 39- 42 F4.2 arcmin rout Semiminor axis of the outer ellipse 44- 47 F4.2 --- Ecc Eccentricity of the ellipses (2) 49- 52 F4.2 arcmin <R> Average radius of the bubble 54- 57 F4.2 arcmin <T> Average thickness of the shell 59- 73 A15 --- MFlags Morphology flags (3)
Note (1): Catalog number preceded by CN if longitude is between 10° and 0°, and CS if longitude is between 360° and 350°. Note (2): The centers and eccentricities of the inner and outer ellipses are constrained to be the same. Note (3): Morphology flags as follows: C = complete or closed ring B = broken or incomplete ring CC = probable enclosed central star cluster, meaning that the stellar density inside the ring appears to be greater than the average stellar density outside the ring BC = complex of two or more bubbles, that may or may not be physically associated MB = Bubbles that have at least one secondary bubble projected within or on its periphery MBm = Bubbles subsidiary to MB bubbles are labeled m(catalog number) according to the MB bubble they are associated with Y = Bubbles that have possible YSO(s) projected within or on its periphery but have not formed a secondary bubble CS = the central star(s) responsible for driving the bubble is/are probably apparent Fl = a flocculent or clumpy bubble structure PN = Two bubbles that are probable planetary nebulae
History: From electronic version of the journal References: Churchwell et al., Paper I 2006ApJ...649..759C Cat. J/ApJ/649/759
(End) Patricia Vannier [CDS] 30-Jan-2010
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