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J/ApJ/702/178      YSOs in the central 400pc of the Galaxy  (Yusef-Zadeh+, 2009)

Star formation in the central 400 pc of the Milky Way: evidence for a population of massive young stellar objects. Yusef-Zadeh F., Hewitt J.W., Arendt R.G., Whitney B., Rieke G., Wardle M., Hinz J.L., Stolovy S., Lang C.C., Burton M.G., Ramirez S. <Astrophys. J., 702, 178-225 (2009)> =2009ApJ...702..178Y
ADC_Keywords: Infrared sources ; Milky Way ; YSOs ; Stars, masses Keywords: galaxies: starburst - Galaxy: center - ISM: clouds - masers - stars: formation Abstract: The central kpc of the Milky Way might be expected to differ significantly from the rest of the Galaxy with regard to gasdynamics and the formation of young stellar objects (YSOs). We probe this possibility with mid-infrared observations obtained with Infrared Array Camera and Multiband Imaging Photometer on Spitzer and with Midcourse Space Experiment. We use color-color diagrams and spectral energy distribution (SED) fits to explore the nature of YSO candidates (including objects with 4.5um excesses possibly due to molecular emission). We use the SEDs of these sources to estimate their physical characteristics; their masses appear to range from ∼10 to ∼20M. Description: The source photometry was based on the 24um catalog compiled by Hinz et al. (2009, Cat. J/ApJS/181/227). Our data are complemented by the Spitzer Legacy program MIPS Inner Galactic Plane Survey (MIPSGAL) which observed 220degrees2 of the inner Galactic plane at 24 and 70um (Carey et al. 2009PASP..121...76C). In order to obtain more complete SEDs of some of the high latitude 24um sources that show excess emission at 4.5um, we selected a total of nine such sources distributed at high Galactic latitudes within our survey. These sources were observed separately with MIPS at 70um between 2007 September 21 and 23. We obtained 32 overlapping images at 20cm from two surveys: Yusef-Zadeh et al. 2004, Cat. J/ApJS/155/421 and Law et al. 2008, Cat. J/ApJS/177/255. C. C. Lang et al. (2011ASPC..439...53L) have completed a 6cm survey of the Galactic center region with a uniform uv coverage. We have used this data set to measure the fluxes of several point sources in the G359.43+0.02 cluster. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 61 18 Galactic coordinates and flux density of sources in G359.43+0.02 table3.dat 88 223 parameters of the SED fits to candidate YSOs in l<0° table4.dat 88 137 parameters of the SED fits to candidate YSOs in l>0° table5.dat 69 33 Table of sources with 4.5um Excess Emission table6.dat 58 9 Table of 70um Sources table7.dat 55 21 Table of Methanol class I maser sources table8.dat 55 23 Table of Methanol class II maser sources table9.dat 90 14 Parameters of SED fits to 4.5um excess sources near the Galactic Center table10.dat 90 19 parameters of SED fits to 4.5um excess sources foreground to the Galactic Center
See also: II/295 : Spitzer IRAC survey of the galactic center (Ramirez+, 2008) J/ApJS/181/227 : Catalog of 24um sources toward Galactic Center (Hinz+, 2009) J/ApJ/697/1741 : Warped disks of YSOs in Galactic center (Bartko+, 2009) J/ApJS/177/255 : GBT multiwavelength survey of Galactic center (Law+, 2008) J/A+A/453/535 : Classification of bright mid-IR sources (Schuller+, 2006) J/ApJ/643/1011 : Early-type stars in the center of the Galaxy (Paumard+, 2006) J/ApJS/155/421 : Survey of Galactic Center region at 20cm (Yusef-Zadeh+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [YHA2009] Source number 3 A1 --- m_[YHA2009] [e] e: Extended component 5 A1 --- n_[YHA2009] [abc] Individual notes (1) 7- 16 F10.6 deg GLON Galactic longitude 18- 26 F9.6 deg GLAT Galactic latitude 28- 31 F4.1 --- S6cm ? VLA 6cm flux density 33- 36 F4.1 --- e_S6cm ? S6cm uncertainty 38- 41 F4.1 --- S20cm ? VLA 20cm flux density 43- 46 F4.1 --- e_S20cm ? S20cm uncertainty 48- 51 F4.1 arcsec amaj ? Major axis 53- 56 F4.1 arcsec amin ? Minor axis 58- 61 I4 arcsec2 Surf ? Surface when circular
Note (1): Flag as follows: a = Infrared counterpart 300758. b = Infrared counterpart 284291. c = Source 11 has a central compact source and an extended component.
Byte-by-byte Description of file: table[34].dat
Bytes Format Units Label Explanations
1- 6 I6 --- SSTGC SST (Spitzer Space Telescope) Galactic center (GC) number (1) 7- 9 A3 --- n_SSTGC [abc, ] Notes for individual sources (2) 11- 18 F8.4 deg GLON Galactic longitude 20- 27 F8.5 deg GLAT Galactic latitude 29- 33 F5.2 --- Chi2 χ2 value 35- 38 I4 --- Nfits Number of acceptably fitting models 40- 43 F4.1 mag Av Visual extinction Av 45- 48 F4.1 Msun Mass Average mass of the protostar 50- 52 F3.1 Msun e_Mass Mass uncertainty 54- 60 E7.2 Lsun Lum Average luminosity of the protostar 62- 68 E7.2 Lsun e_Lum Lum uncertainty 70- 76 E7.2 Msun/yr Menv Average mass accretion rate 78- 84 E7.2 Msun/yr e_Menv Menv 1σ standard deviation 86- 88 A3 --- Stage Evolutionary stage of the fitted source (I, II or III)
Note (1): Based on the IRAC catalogs (Ramirez et al. 2008, Cat. II/295; <SSTGC NNNNNNN> in Simbad) Note (2): Flag as follows: a = radio counterpart 6 b = radio counterpart 5 c = Candidate YSO in the G359.43+0.02 cluster (table 2 of the paper; note that "GLAT" for SSTGC 307175 in table 2 is not 0.02637 but, indeed, -0.00026 as in table 3).
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 2 I2 --- ID Green source identification (<[YHA2009] gNN> in Simbad) (1) 4- 10 F7.3 deg GLON Galactic longitude 12- 17 F6.3 deg GLAT Galactic latitude 19- 20 I2 h RAh Hour of right ascension (J2000) 22- 23 I2 min RAm Minute of right ascension (J2000) 25- 29 F5.2 s RAs Second of right ascension (J2000) 31 A1 --- DE- Sign of declination (J2000) 32- 33 I2 deg DEd Degree of declination (J2000) 35- 36 I2 arcmin DEm Arcminute of declination (J2000) 38- 41 F4.1 arcsec DEs Arcsecond of declination (J2000) 43- 69 A27 --- Comm Description
Note (1): Visually identified from IRAC data. Many point sources may be multiple or extended sources at higher resolution.
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 2 I2 --- ID Source identification from table 5, or from table8 when n_ID is 'a' (1) 3 A1 --- n_ID [a] Methanol class II maser source (2) 5- 13 F9.5 deg GLON Galactic longitude 15- 22 F8.5 deg GLAT Galactic latitude 24- 25 I2 h RAh Hour of right ascension (J2000) 27- 28 I2 min RAm Minute of right ascension (J2000) 30- 34 F5.2 s RAs Second of right ascension (J2000) 36 A1 --- DE- Sign of declination (J2000) 37- 38 I2 deg DEd Degree of declination (J2000) 40- 41 I2 arcmin DEm Arcminute of declination (J2000) 43- 46 F4.1 arcsec DEs Arcsecond of declination (J2000) 48- 52 I5 mJy Flux ? Flux 54- 58 F5.2 --- S/N ? Signal to noise ratio
Note (1): Subset of 4.5um excess sources that were observed with MIPS at 70um. Note (2): Source No. given is for table of methanol class II maser sources (table 8).
Byte-by-byte Description of file: table7.dat table8.dat
Bytes Format Units Label Explanations
1- 2 I2 --- ID Source identification 4- 10 F7.3 deg GLON Galactic longitude 12- 17 F6.3 deg GLAT Galactic latitude 19- 20 I2 h RAh Hour of right ascension (J2000) 22- 23 I2 min RAm Minute of right ascension (J2000) 25- 29 F5.2 s RAs Second of right ascension (J2000) 31 A1 --- DE- Sign of declination (J2000) 32- 33 I2 deg DEd Degree of declination (J2000) 35- 36 I2 arcmin DEm Arcminute of declination (J2000) 38- 41 F4.1 arcsec DEs Arcsecond of declination (J2000) 43- 47 F5.1 km/s Vlsr LSR velocity 49- 55 A7 --- Ref Reference(s) (1)
Note (1): References as follows: H90 = Haschick et al. 1990ApJ...354..556H (44GHz); S94 = Slysh et al. 1994MNRAS.268..464S (44GHz); M97 = Mehringer & Menten 1997ApJ...474..346M (44GHz, multiple sources in Sgr B2); V00 = Val'tts et al. 2000MNRAS.317..315V (95GHz). C96 = Caswell 1996MNRAS.283..606C; W98 = Walsh et al. 1998, Cat. J/MNRAS/301/640
Byte-by-byte Description of file: table9.dat table10.dat
Bytes Format Units Label Explanations
1- 4 A4 --- [YHA2009] Green number (gNNA) 6- 12 I7 --- SSTGC SSTGC number 14- 21 F8.4 deg GLON Galactic longitude 23- 29 F7.4 deg GLAT Galactic latitude 31- 35 F5.2 --- Chi2 χ2 value 37- 40 I4 --- Nfits Number of acceptably fitting models 42- 45 F4.1 mag Av Visual extinction Av 47- 50 F4.1 Msun Mass Average mass of the protostar 52- 54 F3.1 Msun e_Mass Mass uncertainty 56- 62 E7.2 Lsun Lum Average luminosity of the protostar 64- 70 E7.2 Lsun e_Lum Lum uncertainty 72- 78 E7.2 Msun/yr Menv Average mass accretion rate 80- 86 E7.2 Msun/yr e_Menv Menv 1σ standard deviation 88- 90 A3 --- Stage Evolutionary stage of the fitted source
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 26-Sep-2011
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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