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J/PASJ/55/635     Chandra observations of Monoceros R2    (Nakajima+, 2003)

X-ray observation on the Monoceros R2 star-forming region with the Chandra ACIS-I array. Nakajima H., Imanishi K., Takagi S., Koyama K., Tsujimoto M. <Publ. Astron. Soc. Jap., 55, 635 (2003)> =2003PASJ...55..635N
ADC_Keywords: Molecular clouds ; X-ray sources ; Infrared sources ; YSOs Keywords: ISM: individual (Monoceros R2) - ISM: stars - stars: formation - X-rays: stars Abstract: We report on the results of the Chandra ACIS-I observation on the central region of the Monoceros R2 cloud (Mon R2), a high-mass star-forming region (SFR) at a distance of 830pc. With a deep exposure of ∼100ks, we detected 368 X-ray sources, ∼80% of which were identified with the near-infrared (NIR) counterparts. We systematically analyzed the spectra and time variability of most of the X-ray emitting sources and provided a comprehensive X-ray source catalog for the first time. Using the J-, H- and K-bands magnitudes of the NIR counterparts, we estimated the evolutionary phase (classical T Tauri stars and weak-lined T Tauri stars) and the mass of the X-ray emitting sources, and analyzed the X-ray properties as a function of the age and mass. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 74 368 Chandra X-ray sources and stellar counterparts
See also: B/chandra : The Chandra Archive Log (CXC, 2002) II/241 : 2MASS Catalog Intermediate Data Release (IPAC/UMass, 2000) J/ApJ/567/423 : CHANDRA obs. of YSOs in Monoceros R2 (Kohno+, 2002) J/AJ/114/198 : The Monoceros R2 Cluster (Carpenter+ 1997) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [NIT2003] Sequential number 5- 6 I2 h RAh Right ascension (J2000) (1) 8- 9 I2 min RAm Right ascension (J2000) (1) 11- 15 F5.2 s RAs Right ascension (J2000) (1) 17 A1 --- DE- Declination sign (J2000) (1) 18- 19 I2 deg DEd Declination (J2000) (1) 21- 22 I2 arcmin DEm Declination (J2000) (1) 24- 27 F4.1 arcsec DEs Declination (J2000) (1) 29- 35 F7.2 ct Count Background-subtracted X-ray photon counts in the 0.5-10.0keV band. 37- 51 A15 --- XID X-ray identification (2) 53- 74 A22 --- NIRID NIR identification (3)
Note (1): Coordinates are corrected to the 2MASS frame Note (2): X-ray counterparts: KKH: Kohno et al. (2002, Cat. J/ApJ/567/423), [KKH2002] NNN in Simbad GMCF: Gregorio-Hetem et al. (1998A&A...331..193G), [GMC98] Mon X-NN in Simbad Note (3): NIR counterparts: CMDSH: Carpenter et al. (1997, Cat. J/AJ/114/198), [CMD97] NNNN in Simbad 2MASSI: 2MASS Point Source Catalog in the Second Incremental Data Release, Cat. II/241 NIR source names such as d_N and IRS4 are from Beckwith et al. (1976ApJ...208..390B, [BEB76] IRS N), Howard et al. (1994ApJ...425..707H, [AW90] aW, [BEB76] IRS NWW), and Carpenter et al. (1997, Cat. J/AJ/114/198). (i.e. d_N = [AW90] dN, IRS 4 = [BEB76] IRS 4 in Simbad)
History: * 08-May-2006: From electronic version of the journal * 28-May-2009: For object 190, NIRID identification corrected
(End) James Marcout, Patricia Bauer [CDS] 21-Nov-2003
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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