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MYSTIXMIDI - Massive Young Star-Forming Complex Study in IR & X-Rays: Mid-IR Source Catalogs

HEASARC
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Overview

Spitzer IRAC observations and stellar photometric catalogs are presented for the Massive Young star-forming complex Study in the Infrared and X-ray (MYStIX). MYStIX is a multi-wavelength census of young stellar members of 20 nearby (distances < 4 kpc), Galactic, star-forming regions (SFRs) that contain at least one O-type star. All regions have data available from the Spitzer Space Telescope consisting of GLIMPSE or other published catalogs for 11 regions and results of the authors' own photometric analysis of archival data for the remaining 9 regions. The authors also reduced the GLIMPSE data for the W 3 SFR using the aperture photometry method in order to compare the results obtained using the two methods (see Section 3.4.2 of the reference paper).

The reference paper seeks to construct deep and reliable catalogs of sources from the Spitzer images. Mid-infrared study of these regions faces challenges of crowding and high nebulosity. These new catalogs typically contain fainter sources than existing Spitzer studies, which improves the match rate to Chandra X-ray sources that are likely to be young stars, but increases the possibility of spurious point-source detections, especially peaks in the nebulosity. IRAC color-color diagrams help distinguish spurious detections of nebular polycyclic aromatic hydrocarbon (PAH) emission from the infrared excess associated with dusty disks around young stars. The distributions of sources on the mid-infrared color-magnitude and color-color diagrams reflect differences between MYStIX regions, including astrophysical effects such as stellar ages and disk evolution.

The GLIMPSE (Galactic Legacy Infrared Mid-Plane Survey Extraordinaire) Survey is a Legacy Science Program of the Spitzer Space Telescope to study star formation in the disk of the Milky Way Galaxy. It contains six MYStIX regions - the Lagoon Nebula, the Trifid Nebula, NGC 6334, the Eagle Nebula, M 17, and NGC 6357 - within the 2-degree wide strip along the Galactic equator (GLIMPSE I and II data releases). Furthermore, Spitzer images and photometry for RCW 38 and NGC 3576 come from the Vela-Carina survey (Majewski et al. 2007, Spitzer Proposal 40791), using a similar observing strategy with mosaicking and photometric analysis as performed with the GLIMPSE pipeline.

The authors obtained publicly available raw IRAC images from the Spitzer Heritage Archive for nine MYStIX regions without GLIMPSE coverage. The target list and details of the Astronomical Observation Requests (AORs) are provided in Table 1 of the reference paper. The camera spatial resolutions are FWHM = 1.6" to 1.9" from 3.6 to 8.0um.

This table contains the combined IRAC source lists from the GLIMPSE photometry of W 3 and the aperture photometry of the 9 SFRs listed in Table 4, part 1 of the reference paper.


Catalog Bibcode

2013ApJS..209...29K

References

The Massive Young star-forming complex Study in Infrared and X-ray:
mid-infrared observations and catalogs.
    Kuhn M.A., Povich M.S., Luhman K.L., Getman K.V., Busk H.A., Feigelson E.D.
   <Astrophys. J. Suppl. Ser., 209, 29 (2013)>
   =2013ApJS..209...29K    (SIMBAD/NED BibCode)

Provenance

This table was created by the HEASARC in February 2014 based on CDS Catalog J/ApJS/209/29 files table2.dat and table3.dat. To distinguish from which table a source originated, the HEASARC has added a parameter called table_number listing the number of the source table, 2 or 3.

Parameters

SFR_Name
The designation of the MYStIX star-forming region (SFR). See Table 2 of Kuhn et al. (2013, ApJS, 209, 27) for more information on the SFRs. The HEASARC has modified the SFR names given in Table 3 of the reference paper (Kuhn et al. 2013, ApJS, 209, 29) for this present table so that they agree exactly with those in Table 2 of Kuhn et al. (2013, ApJS, 209, 27). All of the objects which were in Table 2 of the reference paper were from the GLIMPSE Survey of the W 3 SFR and have been given the sfr_name value of 'W 3'.

The use of these SFR names for IR sources is to identify Spitzer pointings; they do not necessarily imply membership in these astrophysical clusters.

Table_Number
To distinguish from which table in the reference paper that a source originated, the HEASARC has added this parameter listing the number of the source table, 2 or 3.

Name
The infrared source designation. The main part of the name is based on the Galactic coordinates of the source given to a precision of 10-4 degrees in both Galactic latitude and longitude. The HEASARC has added additional identifying prefixes which conform to Dictionary of Nomenclature of Celestial Objects recommendations for source names, as follows: (i) for the sources in W 3 from the GLIMPSE Survey (table_number = 2), the prefix is 'SSTGLMA' for Spitzer Space Telescope GLIMPSE Archive if glimpse_flag = 'A', or 'SSTGLMC' for Spitzer Space Telescope GLIMPSE Catalog if glimpse_flag = 'C', (ii) for the sources in the 9 other SFRs which were found using IRAC aperture photometry (table_number = 3), the prefix is '[KPL2013] IRAC' for Kuhn, Povich, Luhman 2013 InfraRed Array Camera'.

Glimpse_Flag
The GLIMPSE pipeline was run on a deep, high dynamic range observation of the W 3 star-forming region (AOR 5050624). This flag parameter (given only for sources with table_number = 2) indicates whether the source is only contained in the more complete GLIMPSE Archive (if it is set to 'A'), or if it is contained in the more reliable GLIMPSE Catalog (if it is set to 'C'). The GLIMPSE Catalog contains the sources with reliability >= 99.5% which are considered to be more reliable, while the GLIMPSE Archive contains all sources >= 5 sigma above the background level, i.e., it includes ~ 6,000 additional sources.

RA
The Right Ascension of the infrared source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-7 degrees in the original tables.

Dec
The Declination of the infrared source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-7 degrees in the original tables.

LII
The Galactic Longitude of the infrared source.

BII
The Galactic Latitude of the infrared source.

IRAC_3p6_um_Mag
The Spitzer/IRAC 3.6-micron band magnitude of the infrared source. If glimpse_flag = 'A', the magnitude comes from the GLIMPSE Archive while if glimpse_flag = 'C', the magnitude comes from the GLIMPSE Catalog. Blank values of glimpse_flag indicate that the magnitude derives from the authors' own aperture photometry.

IRAC_3p6_um_Mag_Error
The 1-sigma uncertainty in the Spitzer/IRAC 3.6-micron band magnitude of the infrared source.

IRAC_4p5_um_Mag
The Spitzer/IRAC 4.5-micron band magnitude of the infrared source. If glimpse_flag = 'A', the magnitude comes from the GLIMPSE Archive while if glimpse_flag = 'C', the magnitude comes from the GLIMPSE Catalog. Blank values of glimpse_flag indicate that the magnitude derives from the authors' own aperture photometry.

IRAC_4p5_um_Mag_Error
The 1-sigma uncertainty in the Spitzer/IRAC 4.5-micron band magnitude of the infrared source.

IRAC_5p8_um_Mag
The Spitzer/IRAC 5.8-micron band magnitude of the infrared source. If glimpse_flag = 'A', the magnitude comes from the GLIMPSE Archive while if glimpse_flag = 'C', the magnitude comes from the GLIMPSE Catalog. Blank values of glimpse_flag indicate that the magnitude derives from the authors' own aperture photometry.

IRAC_5p8_um_Mag_Error
The 1-sigma uncertainty in the Spitzer/IRAC 5.8-micron band magnitude of the infrared source.

IRAC_8p0_um_Mag
The Spitzer/IRAC 8.0-micron band magnitude of the infrared source. If glimpse_flag = 'A', the magnitude comes from the GLIMPSE Archive while if glimpse_flag = 'C', the magnitude comes from the GLIMPSE Catalog. Blank values of glimpse_flag indicate that the magnitude derives from the authors' own aperture photometry.

IRAC_8p0_um_Mag_Error
The 1-sigma uncertainty in the Spitzer/IRAC 8.0-micron band magnitude of the infrared source.

Aperture_Size_Flag
The aperture size flag for those sources which were detected using aperture photometry, coded as follows:

      4 = 4-pixel (3.5 arcsecond) aperture used;
      3 = 3-pixel (2.6 arcsecond) aperture used;
      2 = 2-pixel (1.7 arcsecond) aperture used and contaminating flux from
          bright neighboring sources is < 10% of source flux in aperture;
     -1 = 2-pixel  (1.7 arcsecond) aperture used and contaminating flux from
          bright neighboring sources is >= 10% of source flux in aperture.
  

Contact Person

Questions regarding the MYSTIXMIDI database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 4-Feb-2014