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J/ApJ/842/6  Astro-photometric catalog of the core of NGC 5139  (Bellini+, 2017)

The state-of-the-art HST astro-photometric analysis of the core of ω Centauri. I. The catalog. Bellini A., Anderson J., Bedin L.R., King I.R., van der Marel R.P., Piotto G., Cool A. <Astrophys. J., 842, 6-6 (2017)> =2017ApJ...842....6B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Photometry, HST ; Proper motions Keywords: globular clusters: individual: NGC 5139; Hertzsprung-Russell and C-M diagrams; proper motions; stars: Population II; techniques: photometric Abstract: We have constructed the most comprehensive catalog of photometry and proper motions ever assembled for a globular cluster (GC). The core of ωCen (NGC 5139) has been imaged over 650 times through WFC3's UVIS and IR channels for the purpose of detector calibration. There exist from 4 to over 60 exposures through each of 26 filters stretching continuously from F225W in the UV to F160W in the infrared. Furthermore, the 11yr baseline between these data and a 2002 ACS survey has allowed us to more than double the proper-motion accuracy and triple the number of well-measured stars compared to our previous groundbreaking effort. This totally unprecedented complete spectral coverage of over 470000 stars within the cluster's core, from the tip of the red giant branch down to the white dwarfs, provides the best astro-photometric observational database yet to understand the multiple-population phenomenon in any GC. In this first paper of the series, we describe in detail the data-reduction processes and deliver the astro-photometric catalog to the astronomical community. Description: The core of ω Cen (NGC 5139) has been observed through many of the WFC3 filters since 2009 for calibration purposes, and new observations continue to be scheduled. Table 1 summarizes the massive archive of data, organized in a camera/filter fashion. We downloaded from the archive a total of 655 exposures (∼205Ks) taken through 26 HST different bands: 18 for WFC3/UVIS (385 exposures) and 8 for WFC3/IR (270 exposures); spanning 2009 July to 2013 March. This data set can be accessed at MAST via this link: http://archive.stsci.edu/doi/resolve/resolve.html?doi=10.17909/T9WG6S File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 131 26 List of HST WFC3 observations of the core of NGC5139 table3.dat 214 478477 Proper motion information from Bellini+, 2014, J/ApJ/797/115 table4.dat 61 12440402 *The Method-one photometric file table5.dat 49 16633268 *The Method-two and Method-three photometric file table6.dat 107 550000 Artificial-star-tests file
Note on table4.dat, table5.dat, table6.dat: KS2 (FORTRAN software package kitchen_sync2, J. Anderson 2017, in preparation; see also Section 3 of Sabbi+ 2016,J/ApJS/222/11 for an in-depth description of the software) has three approaches for measuring stars. The first approach can only be applied when a star generates a distinct peak within its local 5x5pixel, neighbor-subtracted raster. When that happens, we can measure a position and flux for the star using the PSF appropriate for that location in that exposure. Method two takes the position determined in the finding stage and uses that position and the PSF to determine a best-fit flux from the inner 3x3 pixels. Method three is similar, but it uses the brightest four pixels and weights them by the expected values of the PSF in those pixels, which is appropriate when the source is much fainter than the background noise. See section 3.3 for further explanations.
See also: B/hst : HST Archived Exposures Catalog (STScI, 2007) VII/202 : Globular Clusters in the Milky Way (Harris, 1997) J/A+AS/115/297 : BVRI photometry of Central Field of ω Cen (Lynga+, 1996) J/ApJ/654/915 : Deep FORS1 BR photometry of omega Cen (Sollima+, 2007) J/ApJ/663/296 : omega Cen (NGC5139) subgiants UBVRIc phot. (Villanova+, 2007) J/A+A/493/959 : UBV(RI)cHalpha photometry in omega Cen (Bellini+, 2009) J/ApJ/710/1032 : Proper motions in ω Cen (Anderson+, 2010) J/AJ/140/631 : HST WFC3/UVIS photometry of omega Cen core (Bellini+, 2010) J/ApJ/751/6 : Radial velocities in ω Cen (Da Costa, 2012) J/ApJ/797/115 : HSTPROMO I. Observations and NGC7078 results (Bellini+, 2014) J/ApJ/844/164 : HST astro-photometric data for NGC5139. III. (Bellini+, 2017) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Inst Instrument (WFC3/UVIS or WFC3/IR) 11- 16 A6 --- Filt Filter name (1) 18- 39 A22 s Exp Exposures 41- 45 I5 s Time [908/27600] Total time 47- 51 I5 --- PID1 Program ID 53- 57 I5 --- PID2 ? Second program ID if any 59- 63 I5 --- PID3 ? Third program ID if any 65- 69 I5 --- PID4 ? Fourth program ID if any 71- 75 I5 --- PID5 ? Fifth program ID if any 77- 81 I5 --- PID6 ? Sixth program ID if any 83- 87 I5 --- PID7 ? Seventh program ID if any 89- 93 I5 --- PID8 ? Eighth program ID if any 95-121 A27 --- Comm Description 123-131 A9 --- Date Epoch
Note (1): Photometric-calibration Zero Points (table 2): ------------------------------------------------------ Filter Delmag ZP (VEGA) (mag) (mag) ------------------------------------------------------ WFC3/UVIS ------------------------------------------------------ F225W +7.0889 (+7.3856 -0.2967) +22.3808 F275W +7.0240 (+7.2577 -0.2337) +22.6322 F336W +6.1648 (+6.3602 -0.1954) +23.4836 F350LP +6.1925 (+6.3602 -0.1677) +26.7874 F390M +6.1867 (+6.3602 -0.1735) +23.5377 F390W +6.2007 (+6.3602 -0.1595) +25.1413 F438W +6.1961 (+6.3602 -0.1641) +24.9738 F467M +6.4827 (+6.6330 -0.1503) +23.8362 F555W +3.8302 (+4.0051 -0.1749) +25.8160 F606W +3.8517 (+4.0051 -0.1534) +25.9866 F621M +6.9822 (+7.1251 -0.1429) +24.4539 F656N +6.6090 (+6.7474 -0.1384) +19.8215 F658N +6.2200 (+6.3602 -0.1402) +20.6795 F673N +6.2313 (+6.3602 -0.1289) +22.3297 F775W +6.4621 (+6.6330 -0.1709) +24.4747 F814W +3.8445 (+4.0051 -0.1616) +24.6803 F850LP +4.2503 (+4.4454 -0.1951) +23.3130 F953N +7.1632 (+7.3235 -0.1603) +19.7549 ------------------------------------------------------ WFC3/IR ------------------------------------------------------ F098M -0.0736 +25.1057 F105W -0.0335 +25.6236 F110W -0.0743 +26.0628 F125W -0.0844 +25.3293 F139M -0.0633 +23.4006 F140W -0.1262 +25.3761 F153M -0.0636 +23.2098 F160W -0.0756 +24.6949 ------------------------------------------------------
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 6 I6 --- ID [1/478477] Identification number 8- 14 F7.2 pix Xpix X-position on the master frame 16- 22 F7.2 pix Ypix Y-position on the master frame 24- 25 I2 h RAh [13] Hour of Right Ascension (J2000) 27- 28 I2 min RAm [26/27] Minute of Right Ascension (J2000) 30- 35 F6.3 s RAs Second of Right Ascension (J2000) 37 A1 --- DE- [-] Sign of the Declination (J2000) 38- 39 I2 deg DEd [47] Degree of Declination (J2000) 41- 42 I2 arcmin DEm [25/31] Arcminute of Declination (J2000) 44- 48 F5.2 arcsec DEs Arcsecond of Declination (J2000) 50- 58 F9.4 mas/yr pmRA [-18/12]?=-999.999 Proper motion along RA times cos(DE) 60- 68 F9.4 mas/yr pmDE [-14/16]?=-999.999 Proper motion along DE 70- 78 F9.4 mas/yr e_pmRA [0.003/4]?=-999.999 1σ uncertainty in pmRA (1) 80- 88 F9.4 mas/yr e_pmDE [0.005/4]?=-999.999 1σ uncertainty in pmDE (1) 90- 98 F9.4 mas/yr epmRA [0.004/4]?=-999.999 The 1σ uncertainty in pmRA (2) 100-108 F9.4 mas/yr epmDE [0.004/4]?=-999.999 The 1σ uncertainty in pmDE (2) 110-118 F9.4 --- QpmRA [0.1/67]?=-999.999 Reduced χ2 of fit to pmRA 120-128 F9.4 --- QpmDE [0.1/87]?=-999.999 Reduced χ2 of fit to pmDE 130-138 F9.4 pix sigmaX [0.0005/0.4]?=-999.999 The 1σ uncertainty in intercept of PM fit for RA component (1) 140-148 F9.4 pix sigmaY [0.0005/0.4]?=-999.999 The 1σ uncertainty in intercept of PM fit for DE component (1) 150-159 F10.5 yr Time [0.7/11]?=-999.999 Time baseline; Julian years 161-169 F9.4 pix errX [0.0006/0.3]?=-999.999 The 1σ uncertainty in intercept of PM fit for RA component (3) 171-179 F9.4 pix errY [0.0005/0.4]?=-999.999 The 1σ uncertainty in intercept of PM fit for DE component (3) 181-184 I4 --- Uref [0/1]?=-999 Reference star flag; 1=Yes, 0=No 186-189 I4 --- Nfound [7/281]?=-999 Total number of data points available for PM fits 191-194 I4 --- Nused [5/281]?=-999 Final number of data points used for PM fits 196-204 F9.4 mas/yr DelpmRA [-0.5/0.5]?=-999.999 Difference in pmRA (4) 206-214 F9.4 mas/yr DelpmDE [-0.5/0.6]?=-999.999 Difference in pmDE (4)
Note (1): Computed using actual residuals. Note (2): Computed using expected errors. Note (3): Using expected errors. Note (4): Between locally-corrected and amplifier-based PMs.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 6 A6 --- Filt Filter identifier; see Table 1 8- 15 F8.4 mag mag [9/33]?=-99.999 Apparent Vega magnitude in Filt 17- 26 F10.4 mag e_mag [0/94177]?=-99.999 RMS uncertainty in mag 28- 29 I2 --- Nf [0/71] Number of exposures a star found in 31- 32 I2 --- Ng [0/71] Number of good measurements 34- 38 F5.3 --- QFIT [0/1] Quality-of-fit parameter 40- 47 F8.2 --- fL [-2/20124] Fraction of light in aperture from neighbors 49- 53 F5.1 ct sky [0/999.9] Local sky-background value 55- 59 F5.1 ct RMS [0/999.9] RMS of sky 61 I1 --- Sat ? Saturation flag, UVIS Filters only (1=saturated)
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 6 A6 --- Filt Filter identifier; see Table 1 8- 9 A2 --- Meth Measurement method 11- 18 F8.4 mag mag [9/33]?=-99.999 Apparent Vega magnitude in Filt 20- 29 F10.4 mag e_mag [0/96973]?=-99.999 RMS uncertainty in mag 31- 32 I2 --- Nf [0/71]? Number of exposures a star found in 34- 35 I2 --- Ng [0/71]? Number of good measurements 37- 41 F5.3 --- QFIT [0/1]? Quality-of-fit parameter 43- 49 F7.2 --- fL [-19/4806]? Fraction of light in aperture from neighbors
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 9 F9.4 pix XInpix Input X pixel position 11- 19 F9.4 pix YInpix Input Y pixel position 21- 28 F8.4 mag F606WInmag [-14/-3] Input F606W instrumental magnitude 30- 37 F8.4 mag F438WInmag [-14/-0.08] Input F438W instrumental magnitude 39- 45 F7.2 pix XRecpix Recovered X pixel position 47- 53 F7.2 pix YRecpix Recovered Y pixel position 55- 62 F8.4 mag F606WM1mag [-90.1/-0] Recovered method 1 F606W magnitude 64- 71 F8.4 mag F438WM1mag [-90.1/-0] Recovered method 1 F438W magnitude 73- 80 F8.4 mag F606WM2mag [-90.1/-0] Recovered method 2 F606W magnitude 82- 89 F8.4 mag F438WM2mag [-90.1/-0] Recovered method 2 F438W magnitude 91- 98 F8.4 mag F606WM3mag [-90.1/-0] Recovered method 3 F606W magnitude 100-107 F8.4 mag F438WM3mag [-90.1/-0] Recovered method 3 F438W magnitude
History: From electronic version of the journal References: Bellini et al. Paper I. 2017ApJ...842....6B This catalog Bellini et al. Paper II. 2017ApJ...842....7B Bellini et al. Paper III. 2017ApJ...844..164B Cat. J/ApJ/844/164
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 25-Jan-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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