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J/ApJ/685/1005       Spitzer and high-mass star forming regions     (Qiu+, 2008)

Spitzer IRAC and MIPS imaging of clusters and outflows in nine high-mass star forming regions. Qiu K., Zhang Q., Megeath S.T., Gutermuth R.A., Beuther H., Shepherd D.S., Sridharan T.K., Testi L., De Pree C.G. <Astrophys. J., 685, 1005-1025 (2008)> =2008ApJ...685.1005Q
ADC_Keywords: Photometry, infrared ; YSOs ; H II regions Keywords: infrared: stars - ISM: jets and outflows - reflection nebulae - stars: formation - stars: pre-main sequence Abstract: We present Spitzer Space Telescope IRAC and MIPS observations toward a sample of nine high-mass star forming regions at a distance of around 2kpc. Based on IRAC and MIPS 24um photometric results and 2MASS JHKs data, we carry out a census of young stellar objects (YSOs) in a 5'x5' field toward each region. Toward seven out of the nine regions, we detect parsec-sized clusters with around 20 YSOs surrounded by a more extended and sparse distribution of young stars and protostars. For the other two regions, IRAS 20126+4104 and IRAS 22172+5549, the former has the lowest number of YSOs in the sample and shows no obvious cluster, and the latter appears to be part of a larger, potentially more evolved cluster. Description: The IRAC observations were obtained from 2005 February to September except IRAS 19410+2336, which was observed in 2004 October. The MIPS observations were undertaken in the photometry mode during campaigns separated by less than 1 month from the IRAC observations with the exception of IRAS 22172+5549 (1.5 months' separation) and HH 80-81 (5 months' separation). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 156 417 YSOs: 2MASS, IRAC, MIPS 24um photometry
See also: J/ApJ/629/288 : Infrared sources near AFGL 5142 (Chen+, 2005) J/A+A/361/660 : JHK photometry around S233IR (Porras+, 2000) J/A+A/445/971 : Mid-infrared images of W75N (Persi+, 2006) J/A+A/466/1065 : submm images of IRAS 05358+3543 (Beuther+, 2007) J/A+A/475/925 : IRAS 05358+3543 (sub)mm maps (Leurini+, 2007) J/A+A/489/229 : NIR photometry of IRAS 19410+2336 (Martin-Hernandez+, 2008) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Reg Star forming region 17- 18 I2 h RAh Hour of Right Ascension (J2000) 20- 21 I2 min RAm Minute of Right Ascension (J2000) 23- 27 F5.2 s RAs Second of Right Ascension (J2000) 29 A1 --- DE- Sign of the Declination (J2000) 30- 31 I2 deg DEd Degree of Declination (J2000) 33- 34 I2 arcmin DEm Arcminute of Declination (J2000) 36- 39 F4.1 arcsec DEs Arcsecond of Declination (J2000) 41- 46 F6.3 mag Jmag ? 2MASS J band magnitude 48- 52 F5.3 mag e_Jmag ? Uncertainty in Jmag 54- 59 F6.3 mag Hmag ? 2MASS H band magnitude 61- 65 F5.3 mag e_Hmag ? Uncertainty in Hmag 67- 72 F6.3 mag Ksmag ? 2MASS Ks band magnitude 74- 78 F5.3 mag e_Ksmag ? Uncertainty in Ksmag 80- 85 F6.3 mag 3.6mag ? Spitzer/IRAC 3.6 band magnitude 87- 91 F5.3 mag e_3.6mag ? Uncertainty in 3.6mag 93- 98 F6.3 mag 4.5mag Spitzer/IRAC 4.5 band magnitude 100-104 F5.3 mag e_4.5mag Uncertainty in 4.5mag 106-111 F6.3 mag 5.8mag ? Spitzer/IRAC 5.8 band magnitude 113-117 F5.3 mag e_5.8mag ? Uncertainty in 5.8mag 119-124 F6.3 mag 8.0mag ? Spitzer/IRAC 8.0 band magnitude 126-130 F5.3 mag e_8.0mag ? Uncertainty in 8.0mag 132-133 A2 --- f_24mag Limit flag on 24mag (1) 134-139 F6.3 mag 24mag ? Spitzer/MIPS 24 band magnitude 141-145 F5.3 mag e_24mag ? Uncertainty in 24mag 147-148 A2 --- n_24mag Note on 24mag (2) 150-156 A7 --- Notes Additional remark(s) (3)
Note (1): Indicates that the source is significantly saturated in the MIPS 24 µm band implying a flux level much higher than the saturation limit of 4.1Jy. Note (2): Note as follows: B = most likely attributed to the millimeter source(s) in Zhang et al. (2007ApJ...658.1152Z). * = blended with a neighboring brighter object in the MIPS 24µm band. Magnitudes derived from the PSF-fitting photometry. ** = slightly saturated in the MIPS 24µm band. Magnitudes derived by manually scaling the PSF, subtracting the PSF from the image, and comparing the residual of the PSF wing with a sky value. Note (3): Remark as follows: I = protostar; II = class II; I/II = class I/II; IRe = YSO only identifiable in the 2MASS-IRAC diagram; High = candidate of intermediate- to high-mass YSOs, see numerical notes for details. 1 = the exciting source of the surrounding reflection nebula, associated with the luminous IRAS source (Hunter et al., 1995A&A...302..249H), a B2 star at 3Myr from its position in the J vs. J-H diagram (Chen et al., 2005, Cat. J/ApJ/629/288). 2 = the exciting source of the surrounding reflection nebula, coincident with the IRAS 12µm emission peak, a candidate Herbig Ae/Be star suggested by Porras et al. (2000, Cat. J/A+A/361/660). 3 = the exciting source of the surrounding reflection nebula, spectral type of B2 to B3 estimated from the centimeter free-free emission observed by Marti et al. (1993ApJ...416..208M). 4 = an intermediate- to high-mass pre-main-sequence star suggested by Aspin & Geballe (1992A&A...266..219A). 5 = the exciting source of the surrounding reflection nebula, spectral type of B2 to B3 estimated from the centimeter free-free emission observed by Marti et al. (1993ApJ...416..208M), an intermediate- to high-mass pre-main-sequence star suggested by Aspin et al. (1992???). 6 = the exciting source of the surrounding reflection nebula. 7 = an intermediate-mass YSO suggested by Palau et al. 2007A&A...465..219P 8 = the exciting source of the surrounding reflection nebula, a young B1 star surrounded by a relatively extended UC HII region Palau et al. (2007A&A...465..219P). 9 = a young B star with a 1-20µm luminosity of 254L (Persi et al. 2006A&A...445..971P) to 540L (Moore et al., 1991MNRAS.248...79M). 10 = the exciting source of the surrounding reflection nebula, a B0.5 star at 1-5 Myr surrounded by the expanding HII region W75N(A) and within a warm dust shell (Haschick et al. 1981ApJ...244...76H; Shepherd et al., 2003ApJ...584..882S, 2004ApJ...601..952S). 11 = a young intermediate-mass star with a 1-20µm luminosity of 36L (Persi et al. 2006A&A...445..971P). 12 = the exciting source of the surrounding reflection nebula.
Nomenclature note: YSOs are named <[QZM2008b] JHHMMSS.ss+DDMMSS.ss> in Simbad. History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 16-Dec-2010
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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