J/AJ/140/266 NGC 1333 X-ray luminous YSOs properties (Winston+, 2010)
The properties of X-ray luminous young stellar objects in the NGC 1333 and
Serpens embedded clusters.
Winston E., Megeath S.T., Wolk S.J., Spitzbart B., Gutermuth R.,
Allen L.E., Hernandez J., Covey K., Muzerolle J., Hora J.L., Myers P.C.,
Fazio G.G.
<Astron. J., 140, 266-292 (2010)>
=2010AJ....140..266W 2010AJ....140..266W
ADC_Keywords: Associations, stellar ; X-ray sources ; Infrared sources ; YSOs
Keywords: circumstellar matter - infrared: stars - stars: pre-main sequence -
X-rays: stars
Abstract:
We present new Chandra X-ray data of the NGC 1333 embedded cluster and
combine these data with existing Chandra data, Spitzer photometry, and
ground-based spectroscopy of both the NGC 1333 and Serpens cloud core
clusters to perform a detailed study of the X-ray properties of two of
the nearest embedded clusters to the Sun. We first present new, deeper
observations of NGC 1333 with Chandra ACIS-I and combine these with
existing Spitzer observations of the region. In NGC 1333, a total of
95 cluster members are detected in X-rays of which 54 were previously
identified in the Spitzer data.
Description:
We have obtained Spitzer images of the Serpens and NGC 1333 regions
in six wavelength bands: the 3.6, 4.5, 5.8, and 8.0um bands of the
Infrared Array Camera (IRAC) and the 24um and 70um bands of the
Multi-band Imaging Photometer for Spitzer (MIPS). The photometry
extracted from these data was supplemented by J-, H-, and Ks-band
photometry from the Two Micron All Sky Survey (2MASS) point-source
catalog.
The X-ray data were taken from the Chandra ANCHORS (AN archive of
Chandra Observations of Regions of Star formation11) archive. The
Serpens cluster was observed on 2004 June 19, OBSID 4479, with an
88.45ks exposure time.
The NGC 1333 data are newly published here, hence we describe the
reduction of the NGC 1333 data in detail. NGC 1333 was observed in
three epochs: OBSID 6436, a 36.95ks exposure on 2006 July 5, OBSID
6437, a 40.12ks exposure on 2006 July 11, and OBSID 642, a 43.91ks
exposure on 2000 July 12, giving a total exposure time of 120.98ks.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 82 180 NGC 1333: Chandra X-ray source photometry
table2.dat 169 95 NGC 1333: Coordinates and IR photometry of X-ray
sources
table3.dat 39 95 NGC 1333: IR coordinates and Chandra ID of
X-ray detected YSOs
table4.dat 79 64 Serpens: Spectroscopic and X-ray properties of YSOs
table5.dat 79 74 NGC 1333: Spectroscopic and X-ray properties of YSOs
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See also:
J/ApJ/575/354 : Young stellar objects in the NGC 1333 (Getman+, 2002)
J/ApJ/669/493 : Spitzer/Chandra YSOs in Serpens cloud core (Winston+, 2007)
J/ApJ/674/336 : Spitzer observations of NGC 1333 (Gutermuth+, 2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number <[WMW2010] NNN> in Simbad
5 I1 h RAh Right ascension (J2000)
7- 8 I2 min RAm Right ascension (J2000)
10- 14 F5.2 s RAs Right ascension (J2000)
16 A1 --- DE- Declination sign (J2000)
17- 18 I2 deg DEd Declination (J2000)
20- 21 I2 arcmin DEm Declination (J2000)
23- 27 F5.2 arcsec DEs Declination (J2000)
29- 32 I4 ct RawCt Raw counts
34- 40 F7.2 ct NCt Net Counts, background subtracted and
aperture corrected from raw counts
42- 47 F6.2 10+22cm-2 NH ? Hydrogen column density
49- 52 F4.2 10+22cm-2 e_NH ? rms uncertainty on NH
54- 58 F5.2 keV kT ? Plasma temperature
60- 63 F4.2 keV e_kT ? rms uncertainty on kT
65- 70 F6.2 [mW/m2] FluxA ? Absorbed X-ray flux
72- 77 F6.2 [mW/m2] FluxU ? Total unabsorbed X-ray flux
79- 82 F4.2 --- chi2 ? chi2 value
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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 --- Seq Sequential number <[WMW2010] NNN> in Simbad
5 I1 h RAh X-ray Riht ascension (J2000)
7- 8 I2 min RAm X-ray Right ascension (J2000)
10- 14 F5.2 s RAs X-ray Right ascension (J2000)
16 A1 --- DE- X-ray Declination sign (J2000)
17- 18 I2 deg DEd X-ray Declination (J2000)
20- 21 I2 arcmin DEm X-ray Declination (J2000)
23- 27 F5.2 arcsec DEs X-ray Declination (J2000)
29 I1 h RAIh Infrared Right ascension (J2000) (1)
31- 32 I2 min RAIm Infrared Right ascension (J2000) (1)
34- 38 F5.2 s RAIs Infrared Right ascension (J2000) (1)
40 A1 --- DEI- Infrared Declination sign (J2000) (1)
41- 42 I2 deg DEId Infrared Declination (J2000) (1)
44- 45 I2 arcmin DEIm Infrared Declination (J2000) (1)
47- 52 F6.3 arcsec DEIs Infrared Declination (J2000) (1)
54- 58 F5.3 arcsec Sep Separation (2)
60 A1 --- l_Jmag Limit flag on Jmag
61- 66 F6.3 mag Jmag ?=- 2MASS J magnitude
68- 72 F5.3 mag e_Jmag ? rms uncertainty on Jmag
74 A1 --- l_Hmag Limit flag on Hmag
75- 80 F6.3 mag Hmag ?=- 2MASS H magnitude
82- 86 F5.3 mag e_Hmag ? rms uncertainty on Hmag
88- 93 F6.3 mag Kmag ?=- 2MASS Ks magnitude
95- 99 F5.3 mag e_Kmag ? rms uncertainty on Kmag
101-107 F7.4 mag [3.6] ?=- Spitzer/IRAC 3.6um magnitude
109-113 F5.3 mag e_[3.6] ? rms uncertainty on [3.6]
115-121 F7.4 mag [4.5] ?=- Spitzer/IRAC 4.5um magnitude
123-127 F5.3 mag e_[4.5] ? rms uncertainty on [4.5]
129-135 F7.4 mag [5.8] ?=- Spitzer/IRAC 5.8um magnitude
137-141 F5.3 mag e_[5.8] ? rms uncertainty on [5.8]
143-149 F7.4 mag [8.0] ?=- Spitzer/IRAC 8.0um magnitude
151-155 F5.3 mag e_[8.0] ? rms uncertainty on [8.0]
157-163 F7.4 mag [24] ?=- Spitzer/MIPS 24um magnitude
165-169 F5.3 mag e_[24] ? rms uncertainty on [24]
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Note (1): The IR detections in multiple bands are matched to <1", with the
coordinates at the shortest detected wavelength listed
Note (2): Three sources match to IR detections with separations >1":
12, 135, 188.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- SID Spitzer identifier from Gutermuth et al. (2008,
Cat. J/ApJ/674/336) <[GMM2008] NNN> in Simbad
5 I1 h RAh Right ascension (J2000)
7- 8 I2 min RAm Right ascension (J2000)
10- 14 F5.2 s RAs Right ascension (J2000)
16 A1 --- DE- Declination sign (J2000)
17- 18 I2 deg DEd Declination (J2000)
20- 21 I2 arcmin DEm Declination (J2000)
23- 27 F5.2 arcsec DEs Declination (J2000)
29- 31 A3 --- Class Classification (1)
33- 35 I3 --- Seq Sequential number <[WMW2010] NNN> in Simbad
37- 39 I3 --- GID ? Getman et al. (2002, Cat. J/ApJ/575/354)
identifier, [GFT2002] NNN in Simbad
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Note (1): Evolutionary classification modified from that of Gutermuth et al.
(2008, Cat. J/ApJ/674/336) based on Winston et al. (2007, Cat. J/ApJ/669/493)
as follows:
I = Class I
FS = flat spectrum
II = Class II
TD = transition disk
III = Class III
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- SID Spitzer identifier, from Winston et al.,
2009AJ....137.4777W 2009AJ....137.4777W,
[WMW2007] NNN, in Simbad (G1)
5- 8 A4 --- SpT MK spectral type
10- 12 F3.1 --- e_SpT ? Uncertainty on SpT
14- 18 A5 --- Class YSO Classification (G2)
20- 22 I3 --- Seq ? Chandra sequential number
24- 29 F6.3 [Lsun] logLbol Bolometric magnitude
31- 36 F6.1 K Teff Effective temperature
38- 45 F8.3 [Sun] logSA Stellar surface area, in solar units
47- 51 F5.2 [10-7W] logLX ? X-ray luminosity
53- 57 F5.2 keV kT ? Plasma temperature
59- 63 F5.3 10+22cm-2 NH ? Hydrogen column density
65- 68 F4.2 mag AK ? Absorption in K band (G3)
70 A1 --- l_Age [~] Limit flag on Age
71- 74 F4.1 Myr Age ? Isochronal age (G4)
76- 79 F4.2 Msun Mass ? Isochronal mass (G4)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- SID Spitzer identifier, Gutermuth et al.
(2008, Cat. J/ApJ/674/336),
<[GMM2008] NNN> in Simbad (G1)
5- 8 A4 --- SpT MK spectral type
10- 12 F3.1 --- e_SpT ? Uncertainty on SpT
14- 18 A5 --- Class YSO Classification (G2)
20- 22 I3 --- Seq ? Sequential number, <[WMW2010] NNN> in Simbad
24- 29 F6.3 [Lsun] logLbol Bolometric magnitude
31- 36 F6.1 K Teff Effective temperature
38- 45 F8.3 [Sun] logSA Stellar surface area, in solar units
47- 51 F5.2 [10-7W] logLX ? X-ray luminosity
53- 57 F5.2 keV kT ? Plasma temperature
59- 63 F5.3 10+22cm-2 NH ? Hydrogen column density
65- 68 F4.2 mag AK ? Absorption in K band (G3)
70 A1 --- l_Age [~] Limit flag on Age
71- 74 F4.1 Myr Age ? Isochronal age (G4)
76- 79 F4.2 Msun Mass ? Isochronal mass (G4)
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Global notes:
Note (G1): See Tables 6 and 4 of Winston et al. (2009AJ....137.4777W 2009AJ....137.4777W) for
coordinates and magnitudes associated with spectra.
Note (G2): Classification as follows:
0/I = Class 0/I
FS = flat spectrum
II = Class II
TD = transition disk
III = X-ray detected Class III
[III] = new candidate Class IIIs with detected Li i absorption
Note (G3): A value of zero indicates that the source was blueward of the CTTS
locus, and a null value indicates that a value could not be calculated.
Note (G4): Isochronal age and mass are determined by interpolation from the
Baraffe (1998, Cat. J/A+A/337/403) tracks. Age of ∼0.2 indicates that
the source is very young but on the edge of isochrone grid.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Jun-2012