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J/ApJ/696/47   Chandra study of Rosette star-forming complex. II. (Wang+, 2009)

A Chandra study of the Rosette star-forming complex. II. Clusters in the Rosette Molecular Cloud. Wang J., Feigelson E.D., Townsley L.K., Roman-Zuniga C.G., Lada E., Garmire G. <Astrophys. J., 696, 47-65 (2009)> =2009ApJ...696...47W
ADC_Keywords: Molecular clouds ; X-ray sources ; Cross identifications ; Infrared sources ; Photometry, UBVRI ; YSOs Keywords: ISM: clouds - ISM: individual (Rosette Nebula) - stars: formation - stars: pre-main sequence - X-rays: stars Abstract: We explore here the young stellar populations in the Rosette Molecular Cloud (RMC) region with high spatial resolution X-ray images from the Chandra X-ray Observatory, which are effective in locating weak-lined T Tauri stars as well as disk-bearing young stars. A total of 395 X-ray point sources are detected, 299 of which (76%) have an optical or near-infrared (NIR) counterpart identified from deep FLAMINGOS images. From X-ray and mass sensitivity limits, we infer a total population of ∼1700 young stars in the survey region. Based on smoothed stellar surface density maps, we investigate the spatial distribution of the X-ray sources and define three distinctive structures and substructures within them. Structures B and C are associated with previously known embedded IR clusters, while structure A is a new X-ray-identified unobscured cluster. A high-mass protostar RMCX 89=IRAS 06306+0437 and its associated sparse cluster are studied. Description: The RMC was observed with the Imaging Array of Chandra's Advanced CCD Imaging Spectrometer (ACIS-I) in a sequence of 20ks exposures obtained in 2001 January (ObsIDs 1875-77). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 106 348 Chandra catalog: primary source properties table2.dat 106 47 Chandra Catalog: tentative source properties table3.dat 123 158 X-ray spectroscopy for brighter RMCX sources table4.dat 174 395 Stellar counterparts table5.dat 55 11 X-ray stellar clusters and infrared counterparts
See also: B/chandra : The Chandra Archive Log (CXC, 1999-) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) I/284 : The USNO-B1.0 Catalog (Monet+ 2003) J/ApJ/675/464 : Chandra observations of NGC 2244 (Wang+, 2008) J/ApJ/660/1532 : Spitzer/IRAC-MIPS survey of NGC 2244 (Balog+, 2007) J/A+A/384/890 : BVRIHalpha photometry of NGC 2244 X-ray stars (Berghoefer+, 2002) J/ApJ/574/258 : X-ray-emitting young stars in the Orion nebula (Feigelson+, 2002) J/ApJ/428/693 : Rosette Nebula and Maddalena Cloud structures (Williams+ 1994) : FLAMINGOS data Byte-by-byte Description of file: table[12].dat
Bytes Format Units Label Explanations
1- 3 I3 --- RMCX The RMCX running ID number. Sorted by RA 5 A1 --- f_RMCX [*] Source above the photon flux completeness 7- 24 A18 --- CXOUJ IAU designation ( 26- 34 F9.6 deg RAdeg Right Ascension in decimal degrees (J2000) 36- 43 F8.6 deg DEdeg Declination in decimal degrees (J2000) 45- 47 F3.1 arcsec e_pos Estimated 1σ random position error (2) 49- 52 F4.1 arcmin theta Off-axis angle 54- 58 F5.1 ct FCts Estimated net 0.5-8 keV extracted counts 60- 63 F4.1 ct e_FCts Average Poisson upper and lower 1σ error in FCts 65- 68 F4.1 ct bCts Background 0.5-8 keV extracted counts 70- 73 F4.1 ct HCts Estimated net 2-8 keV extracted counts 75- 78 F4.2 --- fPSF PSF fraction enclused in extraction region (3) 80- 83 F4.1 --- Sig Photometric significance (4) 85 A1 --- l_logPB Limit flag on logPB 86- 90 F5.1 [-] logPB Log probability that extract 0.5-8keV counts from background (5) 92- 95 A4 --- Anom Source anomalies (6) 97 A1 --- Var [abc] Variability characterization (7) 99-102 F4.1 ks Exp Effective exposure time (8) 104-106 F3.1 keV Emed Background-corrected 0.5-8keV median photon energy
Note (2): Computed as standard deviation of PSF inside extraction region divided by the square root of the counts extracted. Note (3): At 1.497keV. Note that a reduced PSF fraction (significantly below 90%) may indicate that the source is in a crowded region. Note (4): Computed as the ratio of the net counts to the upper error on net counts. Note (5): Some sources have PB values above the 1% threshold that defines the catalog because local background estimates can rise during the final extraction iteration after sources are removed from the catalog. Note (6): Source anomalies as follows: g = fractional time that source was on a detector (FRACEXPO from mkarf) is <0.9; e = source on field edge; p = source piled up; s = source on readout streak. Note (7): Variability based on K-S statistic (total band) as follows: a = no evidence for variability (0.05<PKS); b = possibly variable (0.005<PKS<0.05); c = definitely variable (PKS<0.005). No value is reported for sources with fewer than 4 counts or for sources in chip gaps or on field edges. Note (8): Approximate time the source would have to be observed on axis to obtain the reported number of counts.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- RMCX The RMCX running ID number. Sorted by RA 5- 22 A18 --- CXOUJ IAU designation ( 24- 28 F5.1 --- FCts Estimated net 0.5-8 keV extracted counts 30- 33 F4.1 --- Sig Photometric significance (1) 35- 38 F4.2 [cm-2] e_logNH ? Lower 90% confidence interval in logNH (2) 39- 42 F4.1 [cm-2] logNH Log of best fit column density (3) 43 A1 --- f_logNH [i] Indicates logNH frozen in the fits 45- 48 F4.2 [cm-2] E_logNH ? Upper 90% confidence interval in logNH (2) 49- 52 F4.2 keV e_kT ? Lower 90% confidence interval in kT (2) 54- 57 F4.1 keV kT Best fit plasma temperature (3) 58 A1 --- f_kT [i] Indicates kT frozen in the fits 60- 63 F4.2 keV E_kT ? Upper 90% confidence interval in kT (2) 65- 68 F4.2 [cm-3] e_logEM ? Lower 90% confidence interval in logEM (2) 69- 72 F4.1 [cm-3] logEM Log of emission measure of model spectrum (3) 74- 77 F4.2 [cm-3] E_logEM ? Upper 90% confidence interval in logEM (2) 78- 82 F5.2 [10-7W] logS ? Log of 0.5-2keV band luminosity 84- 88 F5.2 [10-7W] logH Log of 2-8keV band luminosity 90- 94 F5.2 [10-7W] logHc Log of absorption-corrected 2-8keV band luminosity (4) 96-100 F5.2 [10-7W] logT Log of 0.5-8keV band luminosity 102-106 F5.2 [10-7W] logTc ? Log of absorption-corrected 2-8keV band luminosity (4) 108-123 A16 --- Notes Additional notes (5)
Note (1): Computed as the ratio of the net counts to the upper error on net counts. Note (2): More significant digits are used for uncertainties <0.1 in order to avoid large rounding errors; for consistency, the same number of significant digits is used for both lower and upper uncertainties. Uncertainties are missing when XSPEC was unable to compute them or when their values were so large that the parameter is effectively unconstrained. Fits lacking uncertainties should be considered to merely be a spline to the data to obtain rough estimates of luminosities; actual parameter values are unreliable. Note (3): All fits used the "wabs(apec)" model in XSPEC and assumed 0.3ZSun abundances (Imanishi et al. 2001ApJ...557..747I, Feigelson et al. 2002, Cat. J/ApJ/574/258). Emission measure assumes a distance of 1.4kpc. Note (4): Absorption-corrected luminosities are are omitted when logNH>22.5 since the soft band emission is essentially unmeasurable. Note (5): 2T means a two-temperature model was used. Well-known counterparts from Table 4 are listed for convenience of the reader.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 3 I3 --- RMCX The RMCX running ID number. Sorted by RA 5- 22 A18 --- CXOUJ IAU designation ( 24- 35 A12 --- USNO USNO-B1.0 designation (Cat. I/284) 37- 41 F5.2 mag Bmag ? USNO-B1.0 B2-band magnitude 43- 47 F5.2 mag Rmag ? USNO-B1.0 R2-band magnitude 49- 53 F5.2 mag Imag ? USNO-B1.0 I-band magnitude 55- 70 A16 --- 2MASS 2MASS ID (HHMMSSss+DDMMSSs; Cat. II/246) 72- 84 A13 --- FLAM FLAMINGOS identification (HHMMSS+DDMMSS) 86- 90 F5.2 mag Jmag ? FLAMINGOS or 2MASS J band magnitude 92- 96 F5.2 mag Hmag ? FLAMINGOS or 2MASS H band magnitude 98-102 F5.2 mag Ksmag ? FLAMINGOS or 2MASS Ks band magnitude 104-109 A6 --- Flag 2MASS PhCcFlag 111 A1 --- 3.6 [cx] Spitzer/IRAC 3.6um counterpart (1) 113-115 I3 --- [MJD95] ? Massey et al. (1995, Cat. J/ApJ/454/151) number (recno of VizieR table) 117-123 I7 --- TASS4 ? Droege et al. (2006, Cat. II/271) number 125-148 A24 --- OName Other name(s) (9) 150-174 A25 --- Note Note (magnitude V or/and spectral type)
Note (1): Flag as follows: c = Spitzer/IRAC 3.6 micron counterpart; x = No Spitzer/IRAC 3.6 micron counterpart. Note (9): OName as follows: [BC02] = Berghofer & Christian (2002, Cat. J/A+A/384/890), [VGK85] = Voroshilov et al. (1985, Cat. III/230), <[VGK85] NGC 2244 +DD NNN> in Simbad. [BGD93] = Block, Geballe, & Dyson (1993A&A...273L..41B) <[BGD93] IRS N> in Simbad.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 3 A3 --- RMC Rosette Molecular Cloud structure name 5- 6 I2 h RAh X-ray hour of right ascension (J2000) 8- 9 I2 min RAm X-ray minute of right ascension (J2000) 11- 12 I2 s RAs X-ray second of right ascension (J2000) 14 A1 --- DE- Declination sign (J2000) 15- 16 I2 deg DEd X-ray degree of declination (J2000) 18- 19 I2 arcmin DEm X-ray arcminute of declination (J2000) 21- 22 I2 arcsec DEs X-ray arcsecond of declination (J2000) 24- 26 F3.1 arcmin Ext1 Extent size 27 A1 --- --- [x] 28- 30 F3.1 arcmin Ext2 Extent size 32- 42 A11 --- JHK JHK counterpart(s) (1) 44 A1 --- S Spitzer counterpart (2) 46- 55 A10 --- IRAS IRAS counterpart
Note (1): JHK clusters are from Phelps & Lada (1997ApJ...477..176P = PL; <[PL97] N> in Simbad) and Roman-Zuniga et al. (2008ApJ...672..861R = REFL). Note (2): Spitzer clusters are from Poulton et al. (2008MNRAS.384.1249P; <[PRG2008] A> in Simbad).
Nomenclature Notes: Tables 1-4: sources are <[WFT2009] RMCX NNN> in Simbad. Table 5: sources are <[WFT2009] XAN> in Simbad History: From electronic version of the journal References: Wang et al. Paper I. 2008ApJ...675..464W Cat. J/ApJ/675/464 Wang et al. Paper III. 2010ApJ...716..474W Cat. J/ApJ/716/474
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 04-May-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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