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J/ApJ/643/965      Spitzer photometry of the Trifid nebula (M20)    (Rho+, 2006)

Spectacular Spitzer images of the Trifid nebula: protostars in a young, massive-star-forming region. Rho J., Reach W.T., Lefloch B., Fazio G.G. <Astrophys. J., 643, 965-977 (2006)> =2006ApJ...643..965R
ADC_Keywords: H II regions ; Infrared sources ; Photometry, infrared Keywords: H II regions - infrared: stars - ISM: individual (Trifid Nebula) - stars: formation Abstract: Spitzer IRAC and MIPS images of the Trifid Nebula (M20) reveal its spectacular appearance in infrared light, highlighting the nebula's special evolutionary stage. The images feature recently formed massive protostars and numerous young stellar objects, and a single O star that illuminates the surrounding molecular cloud from which it formed, and unveil large-scale, filamentary dark clouds. Multiple protostars are detected in the infrared, within the cold dust cores of TC3 and TC4, which were previously defined as Class 0. The cold dust continuum cores of TC1 and TC2 contain only one protostar each. The Spitzer color-color diagram allowed us to identify 160 young stellar objects (YSOs) and classify them into different evolutionary stages. The diagram also revealed a unique group of YSOs that are bright at 24um but have the spectral energy distribution peaking at 58um. Description: We performed our infrared observations of the Trifid Nebula with the Spitzer Space Telescope, the fourth NASA Great Observatory. The Infrared Array Camera (IRAC) and Multiband Imaging Photometer for Spitzer (MIPS) observations took place on 2004 March 31 (AOR 6049024) and 2004 April 11 (AOR 6048768), respectively. Objects: -------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------- 18 02 23.0 -23 01 48 M 20 = NAME TRIFID NEBULA -------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 132 161 Protostars and Young Stellar Objects in the Trifid Nebula Identified by the Spitzer Color-Color Diagram table2.dat 132 12 Properties of Protostars within the Four Dust Continuum Cores
See also: J/ApJ/562/446 : X-rays and protostars in Trifid nebula (Rho+, 2001) Byte-by-byte Description of file: table1.dat table2.dat
Bytes Format Units Label Explanations
1- 11 A11 --- [RRL2006] Source name 13- 14 I2 h RAh Right ascension (J2000) 16- 17 I2 min RAm Right ascension (J2000) 19- 23 F5.2 s RAs Right ascension (J2000) 25 A1 --- DE- Declination sign (J2000) 26- 27 I2 deg DEd Declination (J2000) 29- 30 I2 arcmin DEm Declination (J2000) 32- 35 F4.1 arcsec DEs Declination (J2000) 37- 40 F4.2 mag MIPS24 MIPS 24um magnitude 42- 45 F4.2 mag e_MIPS24 rms uncertainty on MIPS24 47- 50 F4.2 mag IRAC8 IRAC 8um magnitude 52- 55 F4.2 mag e_IRAC8 rms uncertainty on IRAC8 57- 62 F6.3 mag IRAC5.8 ?=99.99 IRAC 5.8um magnitude 64- 67 F4.2 mag e_IRAC5.8 ?=9.99 rms uncertainty on IRAC5.8 69- 73 F5.2 mag IRAC4.5 ?=99.99 IRAC 4.5um magnitude 75- 78 F4.2 mag e_IRAC4.5 ?=9.99 rms uncertainty on IRAC4.5 80- 84 F5.2 mag IRAC3.6 ?=99.99 IRAC 3.6um magnitude 86- 89 F4.2 mag e_IRAC3.6 ?=9.99 rms uncertainty on IRAC3.6 91- 95 F5.2 mag Kmag ?=99.99 Johnson K magnitude (1) 97-100 F4.2 mag e_Kmag ?=9.99 rms uncertainty on Kmag 102-106 F5.2 mag Hmag ?=99.99 Johnson H magnitude (1) 108-111 F4.2 mag e_Hmag ?=9.99 rms uncertainty on Hmag 113-117 F5.2 mag Jmag ?=99.99 Johnson J magnitude (1) 119-122 F4.2 mag e_Jmag ?=9.99 rms uncertainty on Jmag 124-127 F4.1 arcsec Sep ? Separation from central core protostar (table2 only) 129-132 F4.1 solLum LmidIR ? Mid-IR luminosity (table2 only)
Note (1): Near-infrared data are from Palomar 200 inch measurements.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 24-Aug-2007
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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