DOI: 10.57760/sciencedb.j00149.00001
title: Deep Near-Infrared Survey Toward the W40 and Serpens South Region in Aquila Rift: The 2MASS-UKIDSS-CFHT Near-infrared Catalog
title: Deep Near-Infrared Survey Toward the W40 and Serpens South Region in Aquila Rift: The 2MASS-UKIDSS-CFHT Near-infrared Catalog

description: We use Wide-Field Infrared Camera (WIRCam) at the CFHT to take NIR images of the W40 and the Serpens South at the J, H, and Ks bands. Observations were carried out in the J, H, and Ks bands between 2012 July 27 and 29 by Wide-Field Infrared Camera (WIRCam) at the CFHT, which has a field of view of 20'× 20', and a resolution of 0.3" per pixel. The NIR data covers a "Target" field centered at ~ 18:30:30, -2:00:00 and size of ~ 60'*80', and a "Control" field centered at ~ 18:33:24, -1:03:00 and size of ~ 20'*20'. Average full width at half-maximum (FWHM) of sub-fields varies from 0.45" to 0.96". Single image exposure time of J, H, and Ks is 30, 10.3 and 15 s, respectively. Each sub-field is covered by 4–24 exposures, and about 70% of the final integrated images contain more than 16 exposures. Total exposure time reaches 240, 123.6, and 120 s on average, in the J, H, and Ks bands, respectively.Raw images are processed by CFHT’s IDL Interpreter of the WIRCam Images, which is the 'I'wii pipeline. In the pipeline, following processes are performed automatically: chipbias and dark subtraction, flat-fielding, non-linearity correction, cross-talk removal and sky subtraction. Pixels that are bad or saturated are also marked. We adopt the 'Astromatic' suite and optimize the reduction processes to obtain precise images for photometry. Multiple corrections are applied to these photometry results, such as that for optics astigmatism and telescope spikes, color term fitting, and zero magnitude correction. We use PhotVis (Gutermuth et al. 2008b) to identify stars and perform aperture photometry, and also perform the images on SExtractor to assist the evaluation. The radius of aperture, inner and outer radii of the background annulus are chosen to be 0.75", 1.5", and 3". We identify sources with statistics better than 6 S/N ratio.We present our results in this table. It contains 910,275 stars in the W40 - Serpens South Region with Near-infrared (NIR) photometry data from CFHT observation supplemented by 2MASS and UKIDSS. The table has 40 columns, with their headers listed as follows: 1.RA_J2000, 2.DEC_J2000, 3.J_CFHT, 4.JERR_CFHT, 5.H_CFHT, 6.HERR_CFHT, 7.K_CFHT, 8.KERR_CFHT, 9.J_NN, 10.H_NN,11.K_NN, 12.D_JNN, 13.D_HNN, 14.D_KNN, 15.FWHM_J, 16.FWHM_H, 17.FWHM_K, 18.Field, 19.AK_FRONT, 20.AK_TOTAL, 21.SEx_Ellip_J, 22.SEx_Ellip_H, 23.SEx_Ellip_K, 24.Flag_J, 25.Flag_H, 26.Flag_K, 27.J_UKIDSS, 28.JERR_UKIDSS, 29.H_UKIDSS, 30.HERR_UKIDSS, 31.K_UKIDSS, 32.KERR_UKIDSS, 33.RA_2MASS, 34.DEC_2MASS, 35.J_2MASS, 36.JERR_2MASS, 37.H_2MASS, 38.HERR_2MASS, 39.K_2MASS, 40.KERR_2MASSTheir units are as follows:1. Degrees (0~360), 2. Degrees (-90,90), 3.mag, 4.mag, 5.mag, 6.mag, 7.mag, 8.mag, 9.mag, 10.mag, 11.mag, 12.arcsec, arcsec, 13.arcsec, 14.arcsec, 15.arcsec, 16.arcsec, 17.arcsec, 18.0-10, 19.mag, 20.mag, 21.unitless, 22.unitless, 23.unitless, 24.0-16, 25.0-16, 26.0-16, 27.mag, 28.mag, 29.mag, 30.mag, 31.mag, 32.mag, 33. Degrees (0~360), 34. Degrees (-90,90), 35.mag, 36.mag, 37.mag, 38.mag, 39.mag, 40.magMissing data for all columns are set with -1.0, including the 34th column, DEC_2MASS, which has values both &gt; -1.0 and &lt; -1.0. The corresponding physical meanings and some explanations are as follows:1. Ra (J2000) of CFHT stars; 2. Dec (J2000) of CFHT stars; 3. J magnitude of CFHT stars; 4. J magnitude uncertainty of CFHT stars; 5. H magnitude of CFHT stars; 6. H magnitude uncertainty of CFHT stars; 7. K magnitude of CFHT stars; 8. K magnitude uncertainty of CFHT stars; 9. J magnitude of the star's J band nearest neighbor; 10. H magnitude of the star's H band nearest neighbor; 11. K magnitude of the star's K band nearest neighbor; 12. Distance of the star's J band nearest neighbor; 13. Distance of the star's H band nearest neighbor; 14. Distance of the star's K band nearest neighbor; 15. star's full width at half maximum on J band image; 16. star's full width at half maximum on H band image; 17. star's full width at half maximum on K band image; 18. the field number of stars observed by CFHT, 0 means in the "Control" field, and 1-10 means in parts of the "Target" field; 19. dereddening magnitude AK (also called 'FRONT' extinction), adopting the left of Figure 17 in Gutermuth et al. 2009 which only uses J, H and K band; 20. extinction magnitude in K band (so-called 'AK TOTAL'): for the "Target" field it is converted from Herschel column density map, using NH/AV = 1.8 * 10^21 cm−2/mag (Predehl & Schmitt 1995) and AK/AV = 0.112 (Rieke & Lebofsky 1985). For the "Control" field we use 2MASS extinction map, multiplied by a factor of 1/1.22, which is the ratio between the median value of Herschel and 2MASS extinction map in the "Target"; 21. Ellipticity on CFHT image reported by SExtractor in J band, calculated by E=1-B/A, in which A is semi-major axis, and B is semi-minor axis; 22. Ellipticity on CFHT image reported by SExtractor in H band; 23. Ellipticity on CFHT image reported by SExtractor in K band; 24. Star quality flag on CFHT image in J band: +1 = SExtractor reported "blended", +2 = other SExtractor problem flags or not found by SExtractor, +4 = nearby a bright star, +8 = sits on corner of bright star, +16 = has saturated/NAN/negative point nearby star's center on the CFHT image; 25. Star quality flag on CFHT image in H band; 26. Star quality flag on CFHT image in K band; 27. J magnitude from UKIDSS data; 28. J magnitude uncertainty from UKIDSS data; 29. H magnitude from UKIDSS data; 30. H magnitude uncertainty from UKIDSS data; 31. K magnitude from UKIDSS data; 32. K magnitude uncertainty from UKIDSS data; 33. Ra (J2000) from 2MASS data; 34. Dec (J2000) from 2MASS data; 35. J magnitude from 2MASS data; 36. J magnitude uncertainty from 2MASS data; 37. H magnitude from 2MASS data; 38. H magnitude uncertainty from 2MASS data; 39. K magnitude from 2MASS data; 40. K magnitude uncertainty from 2MASS data.
description: We use Wide-Field Infrared Camera (WIRCam) at the CFHT to take NIR images of the W40 and the Serpens South at the J, H, and Ks bands. Observations were carried out in the J, H, and Ks bands between 2012 July 27 and 29 by Wide-Field Infrared Camera (WIRCam) at the CFHT, which has a field of view of 20'× 20', and a resolution of 0.3" per pixel. The NIR data covers a "Target" field centered at ~ 18:30:30, -2:00:00 and size of ~ 60'*80', and a "Control" field centered at ~ 18:33:24, -1:03:00 and size of ~ 20'*20'. Average full width at half-maximum (FWHM) of sub-fields varies from 0.45" to 0.96". Single image exposure time of J, H, and Ks is 30, 10.3 and 15 s, respectively. Each sub-field is covered by 4–24 exposures, and about 70% of the final integrated images contain more than 16 exposures. Total exposure time reaches 240, 123.6, and 120 s on average, in the J, H, and Ks bands, respectively.Raw images are processed by CFHT’s IDL Interpreter of the WIRCam Images, which is the 'I'wii pipeline. In the pipeline, following processes are performed automatically: chipbias and dark subtraction, flat-fielding, non-linearity correction, cross-talk removal and sky subtraction. Pixels that are bad or saturated are also marked. We adopt the 'Astromatic' suite and optimize the reduction processes to obtain precise images for photometry. Multiple corrections are applied to these photometry results, such as that for optics astigmatism and telescope spikes, color term fitting, and zero magnitude correction. We use PhotVis (Gutermuth et al. 2008b) to identify stars and perform aperture photometry, and also perform the images on SExtractor to assist the evaluation. The radius of aperture, inner and outer radii of the background annulus are chosen to be 0.75", 1.5", and 3". We identify sources with statistics better than 6 S/N ratio.We present our results in this table. It contains 910,275 stars in the W40 - Serpens South Region with Near-infrared (NIR) photometry data from CFHT observation supplemented by 2MASS and UKIDSS. The table has 40 columns, with their headers listed as follows: 1.RA_J2000, 2.DEC_J2000, 3.J_CFHT, 4.JERR_CFHT, 5.H_CFHT, 6.HERR_CFHT, 7.K_CFHT, 8.KERR_CFHT, 9.J_NN, 10.H_NN,11.K_NN, 12.D_JNN, 13.D_HNN, 14.D_KNN, 15.FWHM_J, 16.FWHM_H, 17.FWHM_K, 18.Field, 19.AK_FRONT, 20.AK_TOTAL, 21.SEx_Ellip_J, 22.SEx_Ellip_H, 23.SEx_Ellip_K, 24.Flag_J, 25.Flag_H, 26.Flag_K, 27.J_UKIDSS, 28.JERR_UKIDSS, 29.H_UKIDSS, 30.HERR_UKIDSS, 31.K_UKIDSS, 32.KERR_UKIDSS, 33.RA_2MASS, 34.DEC_2MASS, 35.J_2MASS, 36.JERR_2MASS, 37.H_2MASS, 38.HERR_2MASS, 39.K_2MASS, 40.KERR_2MASSTheir units are as follows:1. Degrees (0~360), 2. Degrees (-90,90), 3.mag, 4.mag, 5.mag, 6.mag, 7.mag, 8.mag, 9.mag, 10.mag, 11.mag, 12.arcsec, arcsec, 13.arcsec, 14.arcsec, 15.arcsec, 16.arcsec, 17.arcsec, 18.0-10, 19.mag, 20.mag, 21.unitless, 22.unitless, 23.unitless, 24.0-16, 25.0-16, 26.0-16, 27.mag, 28.mag, 29.mag, 30.mag, 31.mag, 32.mag, 33. Degrees (0~360), 34. Degrees (-90,90), 35.mag, 36.mag, 37.mag, 38.mag, 39.mag, 40.magMissing data for all columns are set with -1.0, including the 34th column, DEC_2MASS, which has values both &gt; -1.0 and &lt; -1.0. The corresponding physical meanings and some explanations are as follows:1. Ra (J2000) of CFHT stars; 2. Dec (J2000) of CFHT stars; 3. J magnitude of CFHT stars; 4. J magnitude uncertainty of CFHT stars; 5. H magnitude of CFHT stars; 6. H magnitude uncertainty of CFHT stars; 7. K magnitude of CFHT stars; 8. K magnitude uncertainty of CFHT stars; 9. J magnitude of the star's J band nearest neighbor; 10. H magnitude of the star's H band nearest neighbor; 11. K magnitude of the star's K band nearest neighbor; 12. Distance of the star's J band nearest neighbor; 13. Distance of the star's H band nearest neighbor; 14. Distance of the star's K band nearest neighbor; 15. star's full width at half maximum on J band image; 16. star's full width at half maximum on H band image; 17. star's full width at half maximum on K band image; 18. the field number of stars observed by CFHT, 0 means in the "Control" field, and 1-10 means in parts of the "Target" field; 19. dereddening magnitude AK (also called 'FRONT' extinction), adopting the left of Figure 17 in Gutermuth et al. 2009 which only uses J, H and K band; 20. extinction magnitude in K band (so-called 'AK TOTAL'): for the "Target" field it is converted from Herschel column density map, using NH/AV = 1.8 * 10^21 cm−2/mag (Predehl & Schmitt 1995) and AK/AV = 0.112 (Rieke & Lebofsky 1985). For the "Control" field we use 2MASS extinction map, multiplied by a factor of 1/1.22, which is the ratio between the median value of Herschel and 2MASS extinction map in the "Target"; 21. Ellipticity on CFHT image reported by SExtractor in J band, calculated by E=1-B/A, in which A is semi-major axis, and B is semi-minor axis; 22. Ellipticity on CFHT image reported by SExtractor in H band; 23. Ellipticity on CFHT image reported by SExtractor in K band; 24. Star quality flag on CFHT image in J band: +1 = SExtractor reported "blended", +2 = other SExtractor problem flags or not found by SExtractor, +4 = nearby a bright star, +8 = sits on corner of bright star, +16 = has saturated/NAN/negative point nearby star's center on the CFHT image; 25. Star quality flag on CFHT image in H band; 26. Star quality flag on CFHT image in K band; 27. J magnitude from UKIDSS data; 28. J magnitude uncertainty from UKIDSS data; 29. H magnitude from UKIDSS data; 30. H magnitude uncertainty from UKIDSS data; 31. K magnitude from UKIDSS data; 32. K magnitude uncertainty from UKIDSS data; 33. Ra (J2000) from 2MASS data; 34. Dec (J2000) from 2MASS data; 35. J magnitude from 2MASS data; 36. J magnitude uncertainty from 2MASS data; 37. H magnitude from 2MASS data; 38. H magnitude uncertainty from 2MASS data; 39. K magnitude from 2MASS data; 40. K magnitude uncertainty from 2MASS data.