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J/ApJ/654/316       X-ray sources in IC 1396N                (Getman+, 2007)

X-ray study of triggered star formation and protostars in IC 1396N. Getman K.V., Feigelson E.D., Garmire G., Broos P., Wang J. <Astrophys. J., 654, 316-337 (2007)> =2007ApJ...654..316G
ADC_Keywords: H II regions ; X-ray sources ; Infrared sources ; Photometry, infrared Keywords: H II regions - ISM: globules - open clusters and associations: individual (IC 1396) - stars: formation - stars: pre-main-sequence - X-rays: stars Abstract: The IC 1396N cometary globule (CG) within the large nearby HII region IC 1396 has been observed with the ACIS detector on board the Chandra X-Ray Observatory. We detect 117 X-ray sources, of which ∼50-60 are likely members of the young open cluster Trumpler 37 dispersed throughout the HII region, and 25 are associated with young stars formed within the globule. Infrared photometry (2MASS and Spitzer) shows that the X-ray population is very young: 3 older Class III stars, 16 classical T Tauri stars, and 6 protostars including a Class 0/I system. Description: The X-ray observation of the globule IC 1396N and its vicinity was obtained on 2004 October 16.9317.30 with the Advanced CCD Imaging Spectrometer (ACIS) on board Chandra. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 111 117 X-Ray Sources in the IC 1396N Field table2.dat 124 25 Infrared Counterparts to X-Ray Globule Sources table3.dat 99 20 NIR Globule Sample of Nisini et al. (2001A&A...376..553N)
See also: B/chandra : The Chandra Archive Log (CXC, 1999-) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [GFG2007] X-ray source number 5- 22 A18 --- CXOUJ IAU designation, HHMMSS.ss+DDMMSS.s 24- 33 F10.6 deg RAdeg Right ascension in decimals degrees (J2000.0) 35- 43 F9.6 deg DEdeg Declination in decimals degrees (J2000.0) 45- 49 F5.2 arcmin Offax Off-axis angle 51- 55 F5.1 ct Fct Estimated net counts from extracted area in total energy band 0.5-8.0keV 57- 60 F4.1 ct e_Fct rms uncertainty on Fct 62- 64 F3.1 ct bkg Estimated background counts from extracted area in total energy band 66- 70 F5.1 ct Hct Estimated net counts from extracted area in hard energy band 2-8keV. 72- 75 F4.2 --- Frac Fraction of the PSF at the fiducial energy of 1.49-7keV enclosed within the extracted area (1) 77- 80 F4.1 --- Signi Source significance 82 A1 --- Flg [geps] Source anomalies flags (2) 84 A1 --- Var [abc] Variability characterization based on K-S statistics (3) 86- 89 F4.1 ks Exp Source effective exposure time 91- 94 F4.2 keV Emed Background-corrected median photon energy in the total 0.5-8keV energy band 96-111 A16 ---- 2MASS 2MASS counterpart (HHMMSSss+DDMMSSs)
Note (1): Note that a reduced PSF fraction (significantly below 90%) may indicate that the source is in a crowded region or on the edge of the field. Note (2): Source anomalies flags 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 (3): Source variability flags as follows: a = no evidence for variability b = possibly variable c = definitively variable No test is performed for sources with fewer than four total full-band counts. No value is reported for sources in chip gaps or on field edges.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [GFG2007] X-ray source number 4- 21 A18 --- CXOUJ IAU designation (HHMMSS.ss+DDMMSS.s) 23- 38 A16 --- 2MASS 2MASS name (HHMMSSss+DDMMSSs) 40- 43 F4.2 arcsec OC2 ? Chandra-2MASS positional offset 45 A1 --- l_Jmag Limit flag on Jmag 46- 50 F5.2 mag Jmag ? 2MASS J magnitude 52 A1 --- l_Hmag Limit flag on Hmag 53- 57 F5.2 mag Hmag ? 2MASS H magnitude 59- 63 F5.2 mag Ksmag ? 2MASS Ks magnitude 65- 67 A3 --- Qual 2MASS photometry quality 68- 70 I3 --- Flag [0]? 2MASS confusion-contamination flag 72- 73 I2 --- N01 ? NIR identifier from Nisini et al. (2001A&A...376..553N), [NMV2001] YSO NN 75- 79 F5.2 mag Kmag ? K-band magnitude from Nisini et al. (2001A&A...376..553N) 81- 84 F4.2 arcsec OCS ? Chandra-Spitzer positional offset 86- 90 F5.2 mag [3.6] Spitzer 3.6um magnitude 92- 95 F4.2 mag e_[3.6] rms uncertainty on [3.6] 97-101 F5.2 mag [4.5] Spitzer 4.5um magnitude 103-106 F4.2 mag e_[4.5] rms uncertainty on [4.5] 108 A1 --- l_[5.8] Limit flag on [5.8] 109-113 F5.2 mag [5.8] Spitzer 5.8um magnitude 115-118 F4.2 mag e_[5.8] ? rms uncertainty on [5.8] 120-123 A4 --- Class Suggested PMS class based on the presence of a NIR counterpart and positions on color-color NIR-MIR diagrams (Fig. 4) 124 A1 --- Note [abc] Individual note (1)
Note (1): Notes as follows: a = X-ray source 60 is offset by 3.2" to the north of the radio continuum source VLA 1 ([BGE2002] VLA 1) and by 5.0" to the northwest of the millimeter source BIMA 1 ([BGE2002] BIMA 1) of Beltran et al. (2002ApJ...573..246B) b = X-ray source 66 is within 0.5" of the radio continuum source VLA 2 ([BGE2002] VLA 2) and millimeter source BIMA 2 ([BGE2002] BIMA 2) of Beltran et al. (2002ApJ...573..246B). This is also millimeter source A ([CBN2001] A) of Codella et al. (2001A&A...376..271C). c = X-ray source 68 is within 1.0" of the radio continuum source VLA 3 ([BGE2002] VLA 3) and millimeter source BIMA 3 ([BGE2002] BIMA 3) of Beltran et al. (2002ApJ...573..246B). This is also millimeter source B ([CBN2001] B) of Codella et al. (2001A&A...376..271C).
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 --- N01 NIR identifier from Nisini et al. (2001A&A...376..553N), [NMV2001] YSO NN 4- 13 F10.6 deg RAdeg Right ascension in decimals degrees (J2000.0) 15- 23 F9.6 deg DEdeg Declination in decimals degrees (J2000.0) 25- 29 F5.2 mag Kmag ? K-band magnitude from Nisini et al. (2001A&A...376..553N) 31- 32 I2 --- [GFG2007] ? X-ray source number 34- 49 A16 --- 2MASS 2MASS name (HHMMSSss+DDMMSSs) 51 A1 --- l_Jmag Limit flag on Jmag 52- 56 F5.2 mag Jmag ? 2MASS J magnitude 58 A1 --- l_Hmag Limit flag on Hmag 59- 63 F5.2 mag Hmag ? 2MASS H magnitude 65 A1 --- l_Ksmag Limit flag on KsHmag 66- 70 F5.2 mag Ksmag ? 2MASS Ks magnitude 72- 74 A3 --- Qual 2MASS photometry quality 75- 77 A3 --- Flag ? 2MASS confusion-contamination flag 79- 83 F5.2 mag [3.6] Spitzer 3.6um magnitude 85- 88 F4.2 mag e_[3.6] rms uncertainty on [3.6] 90- 94 F5.2 mag [4.5] Spitzer 4.5um magnitude 96- 99 F4.2 mag e_[4.5] rms uncertainty on [4.5]
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Nov-2008
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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