J/ApJS/209/31 The MYStIX IR-Excess Source catalog (MIRES) (Povich+, 2013)
The MYStIX infrared-excess source catalog.
Povich M.S., Kuhn M.A., Getman K.V., Busk H.A., Feigelson E.D., Broos P.S.,
Townsley L.K., King R.R., Naylor T.
<Astrophys. J. Suppl. Ser., 209, 31 (2013)>
=2013ApJS..209...31P 2013ApJS..209...31P
ADC_Keywords: Photometry, infrared ; Stars, pre-main sequence ; YSOs ;
H II regions ; Clusters, open
Keywords: infrared: stars - methods: data analysis -
open clusters and associations: general - protoplanetary disks -
stars: pre-main sequence - stars: protostars
Abstract:
The Massive Young Star-Forming Complex Study in Infrared and X-rays
(MYStIX) project provides a comparative study of 20 Galactic massive
star-forming complexes (d=0.4-3.6kpc). Probable stellar members in
each target complex are identified using X-ray and/or infrared data
via two pathways: X-ray detections of young/massive stars with
coronal activity/strong winds or (2) infrared excess (IRE) selection
of young stellar objects (YSOs) with circumstellar disks and/or
protostellar envelopes. We present the methodology for the second
pathway using Spitzer/IRAC, 2MASS, and UKIRT imaging and photometry.
Although IRE selection of YSOs is well-trodden territory, MYStIX
presents unique challenges. The target complexes range from relatively
nearby clouds in uncrowded fields located toward the outer Galaxy
(e.g., NGC 2264, the Flame Nebula) to more distant, massive complexes
situated along complicated, inner Galaxy sightlines (e.g., NGC 6357,
M17). We combine IR spectral energy distribution (SED) fitting with IR
color cuts and spatial clustering analysis to identify IRE sources and
isolate probable YSO members in each MYStIX target field from the
myriad types of contaminating sources that can resemble YSOs:
extragalactic sources, evolved stars, nebular knots, and even
unassociated foreground/background YSOs. Applying our methodology
consistently across 18 of the target complexes, we produce the MYStIX
IRE Source (MIRES) Catalog comprising 20719 sources, including 8686
probable stellar members of the MYStIX target complexes. We also
classify the SEDs of 9365 IR counterparts to MYStIX X-ray sources to
assist the first pathway, the identification of X-ray-detected stellar
members.
Description:
The Massive Young star-forming complex Study in Infrared and X-rays
(MYStIX) project, described by Feigelson et al. (2013ApJS..209...26F 2013ApJS..209...26F),
provides a comprehensive, parallel study of 20 Galactic massive
star-forming regions (MSFRs; d=0.4-3.6kpc). The core data products of
MYStIX are tables of "MYStIX probable complex members" (MPCMs) in each
target MSFR, compiled by Broos et al. (2013ApJS..209...32B 2013ApJS..209...32B). MPCMs are
identified using a combination of X-ray imaging data from the Chandra
X-ray Observatory and infrared (IR) data from the United Kingdom
Infrared Telescope (UKIRT), the Two-Micron All-Sky Survey (2MASS), and
the Spitzer Space Telescope. The basic input data for MIRES were
near-IR (NIR) and mid-IR (MIR) photometric catalogs. We also use NIR
and MIR images and mosaics for visualizing the point-source
populations with respect to various nebular structures. We provide
high-level descriptions of each input catalog in section 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 212 20719 MIRES (MYStIX IR Excess Source) catalog
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See also:
II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)
J/ApJS/209/27 : MYStIX: the Chandra X-ray sources (Kuhn+, 2013)
J/ApJS/209/28 : MYStIX Wide-Field NIR data: crowded fields (King+, 2013)
J/ApJS/209/29 : MYStIX: MIR observations and catalogs (Kuhn+, 2013)
J/ApJS/209/30 : MYStIX: Bayesian matching (Naylor+, 2013)
J/ApJS/209/32 : MYStIX probable young stars (MPCM) (Broos+, 2013)
J/A+A/553/A48 : Near-infrared variability in RCW 38 (Doerr+, 2013)
J/ApJS/194/10 : NIR properties of YSO in the CCCP (Preibisch+, 2011)
J/ApJ/741/35 : NIR photometry and polarization in NGC 2264 (Kwon+, 2011)
J/ApJ/714/L285 : YSO candidates in M17 SWex (Povich+, 2010)
J/MNRAS/407/1170 : IRAC photometry of M8 (Kumar+, 2010)
J/MNRAS/392/1034 : IZJHKL' photometry of NGC 6611 (Oliveira+, 2009)
J/AJ/138/1116 : A Spitzer view of NGC 2264 (Sung+, 2009)
J/ApJ/698/1 : Spitzer observations of NGC 2362 (Currie+, 2009)
J/ApJ/696/1278 : The extended star-forming environment of M17 (Povich+, 2009)
J/A+A/488/211 : Infrared photometry of NGC 1893 (Caramazza+, 2008)
J/MNRAS/384/675 : Monitoring low-mass stars in NGC 2362 (Irwin+ 2008)
J/ApJS/169/353 : Chandra sources in M17 (Broos+, 2007)
J/ApJS/168/100 : X-ray study of star-forming region NGC 6357 (Wang+, 2007)
J/AJ/133/2072 : Spitzer observations of NGC 2362 (Dahm+, 2007)
J/ApJ/671/605 : NGC 2264 and ONC PMS stars in the infrared (Cieza+, 2007)
J/ApJ/642/972 : IR phot. of a star-forming core in NGC 2264 (Young+, 2006)
J/AJ/130/1145 : YSO near-infrared properties (Doppmann+, 2005)
J/ApJ/562/446 : X-rays and protostars in Trifid nebula (Rho+, 2001)
J/A+A/355/651 : HRI observations of PMS stars in NGC 2264 (Flaccomio+, 2000)
J/A+AS/121/223 : Multiphotometry of NGC 6611 (de Winter+ 1997)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- MIRES Source name in IRAC catalog (GLIMPSE or Kuhn
et al., 2013, Cat. J/ApJS/209/29);
in Simbad
19- 29 F11.7 deg RAdeg Right ascension (J2000)
31- 41 F11.7 deg DEdeg Declination (J2000)
43- 48 F6.3 mag Jmag [8/22]? J-band magnitude used for SED fitting
50- 55 F6.3 mag Hmag ? H-band magnitude used for SED fitting
57- 62 F6.3 mag Ksmag ? Ks-band magnitude used for SED fitting
64- 69 F6.3 mag [3.6] [5/19]? Spitzer/IRAC 3.6um magnitude used for
SED fitting
71- 76 F6.3 mag [4.5] ? Spitzer/IRAC 4.5um magnitude used for SED
fitting
78- 83 F6.3 mag [5.8] ? Spitzer/IRAC 5.8um magnitude used for SED
fitting
85- 90 F6.3 mag [8.0] [2/16]? Spitzer/IRAC 8.0um magnitude used for
SED fitting
92- 97 F6.2 mag e_Jmag ? Jmag uncertainty (1)
99-104 F6.2 mag e_Hmag ? Hmag uncertainty (1)
106-111 F6.2 mag e_Ksmag ? Ksmag uncertainty (1)
113-118 F6.2 mag e_[3.6] ? [3.6] uncertainty (1)
120-125 F6.2 mag e_[4.5] ? [4.5] uncertainty (1)
127-132 F6.2 mag e_[5.8] ? [5.8] uncertainty (1)
134-139 F6.2 mag e_[8.0] ? [8.0] uncertainty (1)
141-142 I2 --- n_Jmag [-1/1] Provenance of the J source matched to
IRAC source (0=2MASS, 1=UKIRT, -1=none)
144-145 I2 --- n_Hmag [-1/1] Provenance of the H source matched to
IRAC source (0=2MASS, 1=UKIRT, -1=none)
147-148 I2 --- n_Ksmag [-1/1] Provenance of the Ks source matched to
IRAC source (0=2MASS, 1=UKIRT, -1=none)
150-161 A12 --- IRlab UKIRT catalog label (King et al., 2013,
Cat. J/ApJS/209/28) matched to IRAC source
163 I1 --- Nm [0/1] Number of UKIRT sources providing
possible alternative matches to IRAC source
165 I1 --- Cl [0/3] SED classification flag: 0=likely YSO,
1=starburst galaxy, 2=AGN, 3=PAH knot
167-175 F9.6 --- chi2 [0/18] Reduced χ2 of best-fit SED model (2)
177-185 F9.6 mag Av [0/81] Visual extinction AV (3)
187-188 I2 --- St [-1/2] Evolutionary Stage classification (4)
190-193 F4.2 --- cplx [0/1]? Complex member probability (Prob_dens) (5)
195 I1 --- Mm [0/1] Membership flag (1=probable member of
target MSFR [Reg] (8686 sources), 0 otherwise)
197 I1 --- fx [0/1] FOV flag (1=source falls within Chandra
field-of-view for MYStIX, 0 otherwise)
199-212 A14 --- Reg Name of MYStIX Galactic massive star-forming
regions (MSFR)
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Note (1): Uncertainties on the seven IR magnitudes used for SED fitting,
reset to floor values. Value of 99.99 means the corresponding flux
measurement was used as an upper limit for SED fitting. As described
in Section 3.1, minimum uncertainty used for SED fitting was set in
flux density space using σFi≥0.05Fi for JHKS, [3.6], and
[4.5] and σFi≥0.10Fi for [5.8] and [8.0]. For original
photometric error bars we refer the reader to the appropriate original
source catalogs: King et al. (2013ApJS..209...28K 2013ApJS..209...28K), or GLIMPSE (II/293).
Note (2): The reduced χ2 is χ02/Ndata,with 3≤Ndata≤7
(3≤Ndata≤6 when [4.5] is an upper limit, 4≤Ndata≤7 otherwise)
Note (3): Visual extinction AV determined from χ2-weighted mean of
all acceptable SED fits. See equation (3) in section 4.
Note (4): Evolutionary Stage classification, RW06 (Robitaille et al.,
2006ApJS..167..256R 2006ApJS..167..256R) YSO models as follows:
1 = Stage 0/I,
2 = Stage II/III,
-1 = ambiguous.
All sources in MIRES, regardless of color Class, were fit with RW06
models and hence can be classified according to YSO evolutionary stage.
Note (5): "Prob_dens" is a parameter related to the probability that a
source at a given coordinate is a complex member, based on spatial
clustering analysis. Probdens=1-fcon, where fcon is the fraction
of MIRES in the local neighborhood that are consistent with
foreground/background contaminants. NaN values are assigned to MIRES
Catalog sources falling within designated "control" fields for
clustering analysis.
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History:
From electronic version of the journal
References:
Feigelson et al. Overview. 2013ApJS..209...26F 2013ApJS..209...26F
Kuhn et al. X-ray sources. 2013ApJS..209...27K 2013ApJS..209...27K Cat. J/ApJS/209/27
King et al. Crowded fields. 2013ApJS..209...28K 2013ApJS..209...28K Cat. J/ApJS/209/28
Kuhn et al. MIR. 2013ApJS..209...29K 2013ApJS..209...29K Cat. J/ApJS/209/29
Naylor et al. Bayesian matching. 2013ApJS..209...30N 2013ApJS..209...30N Cat. J/ApJS/209/30
Povich et al. IR excess cat. 2013ApJS..209...31P 2013ApJS..209...31P (this paper)
Broos et al. Young stars. 2013ApJS..209...32B 2013ApJS..209...32B Cat. J/ApJS/209/32
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 09-Jan-2014