J/AJ/128/787 Chandra Orion flanking fields data (Ramirez+, 2004)
Chandra X-ray observations of young clusters. II. Orion flanking fields data.
Ramirez S.V., Rebull L., Stauffer J., Strom S., Hillenbrand L., Hearty T.,
Kopan E.L., Pravdo S., Makidon R., Jones B.
<Astron. J., 128, 787-804 (2004)>
=2004AJ....128..787R 2004AJ....128..787R
ADC_Keywords: Stars, pre-main sequence ; X-ray sources ; Photometry, infrared
Keywords: stars: activity - stars: pre-main-sequence - X-rays: stars
Abstract:
We present results of Chandra observations of two flanking fields
(FFs) in Orion, outside the Orion Nebula Cluster (ONC). We present a
catalog of 417 sources, which includes X-ray luminosity, optical and
infrared photometry, and X-ray variability information.
Description:
Two flanking fields in Orion were observed with the Advanced CCD
Imaging Spectrometer (ACIS) detector on board the Chandra X-Ray
Observatory. The north Orion flanking field (NOFF) is centered at
05:35:19, -04:48:15, about 36' (∼5pc, at a distance of 470pc)
north of the Trapezium cluster and was observed on 2002 August 26 with
a total exposure time of 48.8ks. The south Orion flanking field
(SOFF), centered at 05:35:06, -05:40:48, about 17' (∼2.5pc, at a
distance of 470pc) south of the Trapezium cluster, was observed on
2002 September 6 with a total exposure time of 47.9ks.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 113 417 The Catalog of X-Ray Sources
table2.dat 52 44 Spectral properties of bright sources
table3.dat 90 356 Optical/Infrared Sources with X-Ray Counterparts
table4.dat 110 356 Cross-Identification of Sources with
Optical/Infrared Counterparts
--------------------------------------------------------------------------------
See also:
J/AJ/127/2659 : CHANDRA observations of NGC 2264 (Ramirez+, 2004)
J/AJ/119/3026 : Circumstellar disk candidates in Orion (Rebull+, 2000)
J/AJ/121/1676 : ONC low-mass stars photometry (Rebull+, 2001)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Field Orion flanking field (1)
6- 9 A4 --- [RRS2004] X-ray source identification number
11- 16 A6 --- --- [CXORRS]
18- 33 A16 --- CXORRS Chandra object name
35 I1 h RAh Hour of right ascension (J2000)
37- 38 I2 min RAm Minute of right ascension (J2000)
40- 44 F5.2 s RAs Second of right ascension (J2000)
46 A1 --- DE- Sign of the declination (J2000)
47 I1 deg DEd Degree of declination (J2000)
49- 50 I2 arcmin DEm Arcminute of declination (J2000)
52- 57 F6.3 arcsec DEs Arcsecond of declination (J2000)
59- 63 F5.2 arcmin phi The off-axis angle
65- 69 F5.2 arcsec RExt Count extraction radius
71- 74 F4.2 --- fPSF Fraction of the point-spread function
76- 79 F4.1 ks ExpTime Effective exposure time
81- 86 F6.2 ct/ks CR Count rate
88- 96 E9.3 mW/m2 FX X-ray flux in units of ergs/s/cm2
98-102 F5.2 [10-7W] logLX Logarithm of the X-ray luminosity in units
of ergs/s (2)
104-106 I3 % Prob Probability of the light curve being constant
108-112 A5 --- Com Additional comments (3)
--------------------------------------------------------------------------------
Note (1): Fields:
NOFF = North Orion flanking field
SOFF = South Orion flanking field
Note (2): Assuming a distance to Orion of 470pc.
Note (3): Additional comments as follows:
v = Variable star;
f = Flarelike light curve;
p = Possible flare in the light curve;
s = Steady increase or decrease in the light curve;
c = Source confusion:
There were cases in which two optical/near-IR counterparts were
located within Rext, which is a measure of the size of the PSF
in the Chandra field. This was the case for nine X-ray sources
These sources are marked with a "c" in Table 1 and are matched to
the closest counterpart in each case.
x = Source detected only in X-rays:
There are 61 X-ray sources that do not have optical or infrared
counterparts.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- [RRS2004] X-ray designation
9- 17 A9 --- Name Optical ID
24- 28 F5.1 ct/ks CR Count rate
33- 36 F4.2 keV kT1 Plasma temperature
41- 44 F4.2 keV kT2 Plasma temperature
48- 52 F5.2 10-16W/m2 FX *X-ray flux in units of 10-13ergs/cm2/s
--------------------------------------------------------------------------------
Note on FX: Flux determined from models of mean plasma temperatures.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 23 A23 --- Name Object name
25 I1 h RAh Hour of right ascension (J2000)
27- 28 I2 min RAm Minute of right ascension (J2000)
30- 35 F6.3 s RAs Second of right ascension (J2000)
37 A1 --- DE- Sign of the declination (J2000)
38 I1 deg DEd Degree of declination (J2000)
40- 41 I2 arcmin DEm Arcminute of declination (J2000)
43- 49 F7.3 arcsec DEs Arcsecond of declination (J2000)
51- 54 A4 --- [RRS2004] X-ray source identification number
56- 59 F4.2 mag Umag ? The U-band magnitude
61- 65 F5.2 mag Vmag ? The V-band magnitude
67- 71 F5.2 mag Icmag ? The Ic band magnitude
73- 77 F5.2 mag Jmag ? The J-band magnitude
79- 83 F5.2 mag Hmag ? The H-band magnitude
85- 89 F5.2 mag Kmag ? The K-band magnitude
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- [RRS2004] X-ray source identification number
6- 8 A3 --- --- [Par]
10- 13 I4 --- Parenago ? Parenago, 1954, Cat. II/171, number
15- 17 A3 --- --- [R01]
19- 22 I4 --- [R2001] ? Rebull, 2001, Cat. J/AJ/121/1676, number
24- 26 A3 --- --- [CHS]
28- 32 I5 --- [CHS2001] ? Carpenter et al., 2001, Cat. J/AJ/121/3160
number
34- 38 A5 --- --- [2MASS]
40- 56 A17 --- 2MASS 2MASS name (JHHMMSSss+DDMMSSs)
58-110 A53 --- OName Other names (1)
--------------------------------------------------------------------------------
Note (1): Other names:
SMMV = Stassun et al., 1999, Cat. J/AJ/117/2941; SMMV NNNN
Tian = Tian et al., 1996, Cat. J/A+AS/118/503; [TVZ96] NNN
ROSAT = Gagne & Caillault, 1994, Cat. J/ApJ/437/361; [GC94b] NNN
Einstein = Gagne et al., 1995, Cat. J/ApJ/445/280;[GCS95] NNN
HBC = Herbig & Bell, 1988, Cat. V/73A; HBC NNN
JW = Jones & Walker, 1988AJ.....95.1755J 1988AJ.....95.1755J; JW NNNN
H97 = Hillenbrand, 1997AJ....113.1733H 1997AJ....113.1733H; [H97b] NNNNa
Feigelson = Feigelson et al., 2002, Cat. J/ApJ/574/258; [FBG2002] NNNN
HBJM = Herbst et al., 2001ApJ...554L.197H 2001ApJ...554L.197H
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 09-Feb-2005