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J/A+A/518/L73     Youngest massive protostars in the LMC        (Sewilo+, 2010)

The youngest massive protostars in the LMC. Sewilo M., Indebetouw R., Carlson L.R., Whitney B., Chen C.-H.R., Meixner M., Robitaille T., van Loon J.T., Oliveira J.M., Churchwell E., Simon J.D., Hony S., Panuzzo P., Sauvage M., Roman-Duval J., Gordon K., Engelbracht C., Misselt K., Okumura K., Beck T., Hora J., Woods P.M. <Astron. Astrophys. 518, L73 (2010)> =2010A&A...518L..73S
ADC_Keywords: Magellanic Clouds ; Protostars ; YSOs ; Photometry, infrared ; Photometry, millimetric/submm Keywords: stars: formation - stars: protostars - Magellanic Clouds Abstract: We demonstrate the unique capabilities of Herschel to study very young luminous extragalactic young stellar objects (YSOs) by analyzing a central strip of the Large Magellanic Cloud obtained through the HERITAGE Science Demonstration Program. We combine PACS 100 and 160, and SPIRE 250, 350, and 500um photometry with 2MASS (1.25-2.17um) and Spitzer IRAC and MIPS (3.6-70um) to construct complete spectral energy distributions (SEDs) of compact sources. From these, we identify 207 candidate embedded YSOs in the observed region, ∼40% never-before identified. We discuss their position in far-infrared color-magnitude space, comparing with previously studied, spectroscopically confirmed YSOs and maser emission. All have red colors indicating massive cool envelopes and great youth. We analyze four example YSOs, determining their physical properties by fitting their SEDs with radiative transfer models. Fitting full SEDs including the Herschel data requires us to increase the size and mass of envelopes included in the models. This implies higher accretion rates (greater or equal to 10-4M/yr), in agreement with previous outflow studies of high-mass protostars. Our results show that Herschel provides reliable longwave SEDs of large samples of high-mass YSOs; discovers the youngest YSOs whose SEDs peak in Herschel bands; and constrains the physical properties and evolutionary stages of YSOs more precisely than was previously possible. Description: This table contains the names, coordinates, 2MASS (JHKs), Spitzer (IRAC 3.6, 4.5, 5.8, 8.0um; MIPS 24, 70um), and Herschel (PACS 100, 160; SPIRE 250, 350, 500um) fluxes for 4 embedded YSOs analyzed in the paper. Source fluxes were determined by aperture photometry on 2MASS, Spitzer, and Herschel images using apertures scaled to the instrumental resolution. Details on aperture sizes and aperture corrections can be found in Sect. 2 of the paper. The last column of the table gives alternative names of the sources from literature. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 192 4 Spitzer and Herschel fluxes for YSOs discussed in Sect. 5
See also: J/ApJS/184/172 : High- and intermediate-mass YSOs in the LMC (Gruendl+, 2009) J/ApJ/699/150 : Spectral analysis of massive YSOs in LMC (Seal+, 2009) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Name Source name (YSO-N) 7- 8 I2 h RAh Right ascension (J2000) 10- 11 I2 min RAm Right ascension (J2000) 13- 17 F5.2 s RAs Right ascension (J2000) 19 A1 --- DE- Declination sign (J2000) 20- 21 I2 deg DEd Declination (J2000) 23- 24 I2 arcmin DEm Declination (J2000) 26- 29 F4.1 arcsec DEs Declination (J2000) 31 A1 --- l_FJ Limit flag on FJ 32- 34 F3.1 mJy FJ 2MASS J band flux 36- 38 F3.1 mJy e_FJ ? rms uncertainty in FJ 40 A1 --- l_FH Limit flag on FH 41- 43 F3.1 mJy FH 2MASS H band flux 45- 47 F3.1 mJy e_FH ? rms uncertainty in FH 49 A1 --- l_FKs Limit flag on FKs 50- 52 F3.1 mJy FKs 2MASS Ks band flux 54- 56 F3.1 mJy e_FKs ? rms uncertainty in FKs 58- 62 F5.2 mJy F3.6 Spitzer/IRAC 3.6 micron band flux 64- 67 F4.2 mJy e_F3.6 rms uncertainty in F3.6um 69- 73 F5.2 mJy F4.5 Spitzer/IRAC 4.5 micron band flux 75- 78 F4.2 mJy e_F4.5 rms uncertainty in F4.5um 80 A1 --- l_F5.8 Limit flag on F5.8um 81- 83 I3 mJy F5.8 Spitzer/IRAC 5.8 micron band flux 85- 86 I2 mJy e_F5.8 ? rms uncertainty in F5.8um 88 A1 --- l_F8.0 Limit flag on F8.0um 89- 91 I3 mJy F8.0 Spitzer/IRAC 8.0 micron band flux 93- 94 I2 mJy e_F8.0 ? rms uncertainty in F8.0um 96 A1 --- l_F24 Limit flag on F24um 97-100 I4 mJy F24 Spitzer/MIPS 24 micron band flux 102-103 I2 mJy e_F24 ? rms uncertainty in F24um 105-109 I5 mJy F70 Spitzer/MIPS 70 micron band flux 111-114 I4 mJy e_F70 rms uncertainty in F70um 116-120 I5 mJy F100 Herschel/PACS 100 micron band flux 122-125 I4 mJy e_F100 rms uncertainty in F100um 127-131 I5 mJy F160 Herschel/PACS 160 micron band flux 133-137 I5 mJy e_F160 rms uncertainty in F160um 139-143 I5 mJy F250 Herschel/SPIRE 250 micron band flux 145-148 I4 mJy e_F250 rms uncertainty in F250um 150-154 I5 mJy F350 Herschel/SPIRE 350 micron band flux 156-159 I4 mJy e_F350 rms uncertainty in F350um 161 A1 --- l_F500 Limit flag on F500um 162-165 I4 mJy F500 Herschel/SPIRE 500 micron band flux 167-169 I3 mJy e_F500 ? rms uncertainty in F500um 171-188 A18 --- OName Other names 190-192 A3 --- r_OName Reference for OName (1)
Note (1): Reference as follows: 1 = Gruendl & Chu, 2009, Cat. J/ApJS/184/172 2 = Seale, Looney, Chu et al., 2009, Cat. J/ApJ/699/150
Acknowledgements: Marta Sewilo, mmsewilo(at)
(End) Marta Sewilo [STScI], Patricia Vannier [CDS] 27-Apr-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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