J/AJ/120/1426 Chandra sources in ONC & BN-KL (Garmire+, 2000)
Chandra X-ray observatory study of the Orion nebula cluster and BN/KL region.
Garmire G., Feigelson E.D., Broos P., Hillenbrand L.A., Pravdo S.H.,
Townsley L., Tsuboi Y.
<Astron. J. 120, 1426 (2000)>
=2000AJ....120.1426G 2000AJ....120.1426G
ADC_Keywords: X-ray sources ; Cross identifications
Misson_Name: Chandra
Keywords: infrared radiation - ISM: individual (Orion Nebula) -
stars: activity - stars: pre-main-sequence - X-rays
Description:
About 1000 X-ray emitting young premain-sequence (PMS) stars
distributed in mass from ∼0.05M☉ brown dwarfs to a ∼50M☉ O
star are detected in an image of the Orion Nebula obtained with the
Advanced CCD Imaging Spectrometer (ACIS) on board the Chandra X-Ray
Observatory.
The sources in the Becklin-Neugebauer/Kleinman-Low region of massive
star formation are discussed in detail.
Note:
A more extensive and accurate list is in preparation, based on more
Chandra data which will have more sources and many more columns of
information.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 24 973 ACIS sources in the ONC
table2.dat 76 27 ACIS sources near the Becklin-Neugebauer (BN) object
notes.dat 80 39 Individual notes
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ONC Sequential number of ACIS source in ONC
7 I1 h RAh ACIS source right ascension (J2000.0)
9- 10 I2 min RAm ACIS source right ascension (J2000.0)
12- 15 F4.1 s RAs ACIS source right ascension (J2000.0)
17 A1 --- DE- ACIS source declination sign (J2000.0)
18 I1 deg DEd ACIS source declination (J2000.0)
20- 21 I2 arcmin DEm ACIS source declination (J2000.0)
23- 24 I2 arcsec DEs ACIS source declination (J2000.0)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- BN Sequential number of ACIS source in BN (1)
4 I1 h RAh ACIS source right ascension (J2000.0)
6- 7 I2 min RAm ACIS source right ascension (J2000.0)
9- 13 F5.2 s RAs ACIS source right ascension (J2000.0)
15 A1 --- DE- ACIS source declination sign (J2000.0)
16 I1 deg DEd ACIS source declination (J2000.0)
18- 19 I2 arcmin DEm ACIS source declination (J2000.0)
21- 24 F4.1 arcsec DEs ACIS source declination (J2000.0)
26- 28 I3 ct/ks Counts ACIS source counts extracted from a 15 circle
in the 0.28 keV band with ASCA grades after
correction for charge-transfer inefficiency.
A background of 2 counts per source has
been subtracted.
30- 33 F4.1 [cm-2] logNH ? ACIS source hydrogen column density
34 A1 --- u_logNH rms uncertainty on logNH
36- 38 F3.1 arcsec theta ? Offset between the ACIS source and its
counterpart (2)
40- 44 A5 --- Class Counterpart class (3)
47- 53 A7 --- IDo Optical counterpart designation (4)
55- 58 F4.1 mag Imag ? Optical counterpart I magnitude
60- 67 A8 --- IDi Infrared counterpart designation (4)
70- 73 F4.1 mag Kmag ? Infrared counterpart K magnitude
75 A1 --- Note Individual note in notes.dat file
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Note (1): CXOONC JHHMMSS.s+DDMMSS in Simbad
Note (2): Offset based on on K-band (Hillenbrand & Carpenter,
2000ApJ...540..236H 2000ApJ...540..236H in press) or radio positions (Felli et al.
1993A&AS..101..127F 1993A&AS..101..127F, adjusted to the astrometry of Menten & Reid,
1995ApJ...445L.157M 1995ApJ...445L.157M).
Note (3): Classification:
ONC: ACIS sources are likely members of the Orion Nebula cluster,
generally optically bright, lightly-absorbed stars
IR: ACIS sources have infrared but not optical counterparts and
are likely embedded young stars
X-ray: ACIS sources have no photospheric stellar counterparts
Note (4): Counterpart designations:
JW: Jones & Walker 1988AJ.....95.1755J 1988AJ.....95.1755J (JW NNNN in Simbad)
PC: Prosser et al. 1994ApJ...421..517P 1994ApJ...421..517P (PSH NNN in Simbad)
HC: Hillenbrand & Carpenter, 2000ApJ...540..236H 2000ApJ...540..236H
BN and Source n : Lonsdale et al. (1982AJ.....87.1819L 1982AJ.....87.1819L).
BN: Becklin-Neugebauer source = NAME Orion-BN in Simbad
Source n = LBLS n in Simbad
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1 A1 --- Note Note
3- 80 A78 --- Text Text of the note
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History:
From AJ electronic version,
table1 copied at ftp://ftp.astro.psu.edu/pub/edf/orion/garmire.tab1.dat
(End) James Marcout, Patricia Bauer [CDS] 05-Dec-2000