J/ApJ/575/354 Young stellar objects in the NGC 1333 (Getman+, 2002)
Chandra study of young stellar objects in the NGC 1333 star-forming cloud.
Getman K.V., Feigelson E.D., Townsley L., Bally J., Lada C.J., Reipurth B.
<Astrophys. J. 575, 354 (2002)>
=2002ApJ...575..354G 2002ApJ...575..354G
ADC_Keywords: Clusters, open ; Stars, early-type ; X-ray sources ;
Photometry, infrared
Keywords: open clusters and associations: individual (NGC 1333) -
stars: early-type - stars: pre-main-sequence - X-rays: stars
Abstract:
NGC 1333, a highly active star formation region within the Perseus
molecular cloud complex, has been observed with the ACIS-I detector on
board the Chandra X-Ray Observatory. In our image with a sensitivity
limit of ∼1928erg/s, we detect 127 X-ray sources, most with
subarcsecond positional accuracy. While 32 of these sources appear to
be foreground stars and extragalactic background, 95 X-ray sources are
Identified with known cluster members.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 110 109 ACIS NGC 1333 sources and stellar identifications
notes.dat 79 50 Notes
table2.dat 122 109 X-ray properties of NGC 1333 sources
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See also:
J/A+A/401/543 : XMM-Newton observations of NGC 1333 (Preibisch, 2003)
J/A+AS/106/165 : Near-IR imaging photometry of NGC 1333 (Aspin+ 1994)
J/AJ/111/1964 : JHK photometry of NGC 1333 (Lada+, 1996)
J/AJ/127/1131 : NGC 1333 low-mass stars infrared photometry (Wilking+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [GFT2002] X-ray source number
5- 14 A10 --- --- [CXONGC1333]
15- 31 A17 --- CXONGC1333 X-ray source name (G1)
33- 34 I2 h RAh Hour of Xray source Right Ascension (J2000)
36- 37 I2 min RAm Minute of Xray source Right Ascension (J2000)
39- 43 F5.2 s RAs Second of Xray source Right Ascension (J2000)
45 A1 --- DE- Sign of the X-ray source Declination (J2000)
46- 47 I2 deg DEd Degree of X-ray source Declination (J2000)
49- 50 I2 arcmin DEm Arcminute of X-ray source Declination (J2000)
52- 55 F4.1 arcsec DEs Arcsecond of X-ray source Declination (J2000)
57- 59 F3.1 arcmin Theta Distance from the aimpoint of ACIS field
61- 62 I2 --- P97 ? Preibisch (1997A&A...324..690P 1997A&A...324..690P)
source number
64- 66 I3 --- HH ? Herbig & Jones (1983AJ.....88.1040H 1983AJ.....88.1040H)
optical counterpart number, HH NNA
68- 70 A3 --- [BR2001] [yes ] Visible in Bally & Reipurth
(2001ApJ...546..299B 2001ApJ...546..299B) Hα/[S II] image
72- 74 F3.1 arcsec X-USNO ? Xray - USNO-A2.0 offset if listed in the
USNO-A2.0 (Cat. I/252)
76- 79 F4.1 mag Imag ? The KPNO image I band magnitude
81 A1 --- f_Imag [Cy] Flag on Imag (2)
83- 85 I3 --- ASR ? Aspin et al. (1994, Cat. J/A+AS/106/165)
NIR counterpart number
87- 89 I3 --- LAL ? Lada et al. (1996AJ....111.1964L 1996AJ....111.1964L)
NIR counterpart number
91 A1 --- f_LAL [B] Blending flag on LAL (3)
93- 97 F5.2 mag Kmag ? The Lada et al. (1996AJ....111.1964L 1996AJ....111.1964L)
K band magnitude (4)
99-102 F4.2 mag J-H ? The Lada et al. (1996AJ....111.1964L 1996AJ....111.1964L)
(J-H) color index
104-107 F4.2 mag H-K ? The Lada et al. (1996AJ....111.1964L 1996AJ....111.1964L)
(H-K) color index
109-110 I2 --- Notes ? Note code on other counterparts,
in notes.dat file
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Note (2): Flag on Imag as follows:
y = star is saturated;
C = confused region where X-ray position lost in the glare of a
nearby source or reflection nebula.
Note (3): 'B' denotes blended cases where ACIS resolved a close double
that is unresolved in the infrared data.
Note (4): Except for sources 9, 35 and 51, we use the photometry of
Aspin (1994, Cat. J/A+AS/106/165).
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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- 2 I2 --- Note Code number of the note
3- 79 A77 --- Text Text of the note
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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- 3 I3 --- [GFT2002] X-ray source number
5- 14 A10 --- --- [CXONGC1333]
15- 31 A17 --- CXONGC1333 X-ray source name (G1)
33- 36 I4 ct Cxtr Extracted full band (0.5-8keV) counts
from Rad
38- 39 I2 ct Bxtr Extracted full band (0.5-8keV)
background counts
41- 44 F4.1 arcsec Rad Event extraction radius
46- 49 F4.2 --- Frac Fraction of source's events within Rad
51- 54 F4.1 ct/ks CR Average source count rate
56- 61 A6 --- VClass Variability class (2)
63 A1 --- l_logNH Limit flag on logNH
64- 67 F4.1 [cm-2] logNH ? Log of the model hydrogen column density
69- 72 F4.1 [cm-2] e_logNH ? Lower 1σ error on logNH
74- 78 F5.2 [cm-2] E_logNH ? Upper 1σ error on logNH
80 A1 --- l_kT Limit flag on kT
81- 84 F4.1 keV kT ? Model plasma energy
86- 88 F3.1 keV e_kT ? Lower 1σ error on kT
90- 93 F4.1 keV E_kT ? Upper 1σ error on kT
95 A1 --- l_logLs Limit flag on logLs
96- 99 F4.1 [10-7W] logLs ? Log of soft-band (0.5-2keV) luminosity (3)
101 A1 --- l_logLh Limit flag on logLh
102-105 F4.1 [10-7W] logLh ? Log of hard-band (2-8keV) luminosity (3)
107 A1 --- l_logLt Limit flag on logLt
108-111 F4.1 [10-7W] logLt ? Total band (0.5-8keV) luminosity (3)
113 A1 --- l_logLc Limit flag on logLc
114-117 F4.1 [10-7W] logLc ? Total band luminosity corrected for
estimated interstellar absorption (3)
119-121 A3 --- Notes Details of non-standard spectral fit (4)
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Note (2): Variability class as follows:
Flare = flare
Pos fl = possible flare
Const = constant
Note (3): Assuming a distance of 318pc and units of erg/s.
Note (4): Details of non-standard spectral fit as follows:
a = kT and logNH may be unreliable but are reported here to allow
the reproduction of the spline-like fits to the event distribution
for the calculation of broad-band luminosities logLt.
b = Fitted plasma energies above ∼ 10 keV and column densities below
∼20.0cm-2 are not well-determined.
c = Foreground stars:
#5 (distance is less than 318c) and
#33 (distance is 192pc, Preibisch (1997A&A...324..690P 1997A&A...324..690P)).
d = No spectral fit is done as a result of a small number of counts.
Most of these sources have an approximate X-ray luminosity
logLt~=1028erg/s.
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Gloibal notes:
Note (G1): Source name in IAU format CXONGC1333 JHHMMSS.s+DDMMSS.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 06-Feb-2003