Changes between Version 8 and Version 9 of 2MASS_info_in_DVO
- Timestamp:
- Mar 8, 2009, 11:27:08 AM (17 years ago)
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2MASS_info_in_DVO
v8 v9 1 === Quick summary of the 2mass -> dvo interpretations from the 2MASS Point Source Catalog === 2 ''(based on 03/10/08 emails from E. Magnier to M. Liu)'' 1 === Summary of the 2mass -> DVO interpretations from the 2MASS Point Source Catalog === 3 2 4 * '''ra, dec''' : obvious 3 ''(update 2009/03/08 be EAM; originally based on 2008/03/10 emails from EAM to M. Liu)'' 5 4 6 * '''m''' -> mag 7 * '''cmsig''' -> dM 8 * '''msigcom''' -> dMcal (dMcal^2^ + dM^2^ = msigcom^2^) 9 * '''stdap''' -> Map 10 * '''snr''' : skipped 11 12 * '''err_maj''' -> fhwm_x 13 * '''err_min''' -> fhwm_y 14 * '''err_ang''' -> angle 5 In the 2MASS PSC, all sources are described by the equivalent of a single database row, with separate fields in the row for J, H, and K specific measurements, and some fields common to all three filters. For example, the coordinates and observing time are all given as a single value for all three filters. In the conversion to the DVO representation, each measurement (JHK) of an object is converted to a separate DVO measurement entry. All 2MASS sources are guaranteed to have all three measurements instantiated, but in some cases the measurements may be upper limits (non-detections in those filters). Below, we list the relationship between the 2MASS information on the left side of the -> and the DVO measurement field on the right side. 6 7 * '''ra, dec''' : recorded using the DVO standard of delta RA,DEC relative to the object's average RA,DEC location. 8 9 * '''m''' -> mag 10 * '''cmsig''' -> dM 11 * '''msigcom''' -> dMcal (dMcal^2^ + dM^2^ = msigcom^2^) 12 * '''stdap''' -> Map 13 * '''snr''' : ''skipped'' 14 15 * '''err_maj''' -> FWx (FWHM_MAJOR) 16 * '''err_min''' -> FWy (FWHM_MINOR) 17 * '''err_ang''' -> theta 15 18 16 19 * '''x_scan''' -> Xccd 17 20 18 * '''j_psfchi''' --> psfChisq 21 * '''j_psfchi''' --> psfChisq for J-band measurement 22 * '''h_psfchi''' --> psfChisq for H-band measurement 23 * '''k_psfchi''' --> psfChisq for K-band measurement 19 24 20 * '''jd''' -> time is set in a fashion with DVO's understanding of time (unsigned integers, since 1970?)25 * '''jd''' -> time is set using the DVO representation of time (unsigned integer seconds, since 1970/01/01T00:00:00, ie UNIX Time) 21 26 22 27 === The following 2MASS values are used to set bits in the phot_flags field: === 23 28 24 * ''' ''ph_qual:'''''29 * '''ph_qual:''' 25 30 26 31 X = 0x0000 There is a detection at this location, but no valid … … 66 71 [jhk]_cmsig requirement. 67 72 68 * ''' ''rd_flag:'''''73 * '''rd_flag:''' 69 74 70 75 0 = 0x0000 Source is not detected in this band. The default magnitude … … 120 125 of the measurement aperture of sky annulus falls off the focal plane. 121 126 122 * ''' ''cc_flag:'''''127 * '''cc_flag:''' 123 128 124 129 p = 0x0000 Persistence. Source may be contaminated by a latent image … … 144 149 detected in the band. 145 150 146 * ''' ''bl_flag:''''' (0,1 : not blended) anything except 0 or 1 -> 0x0008151 * '''bl_flag:''' (0,1 : not blended) anything except 0 or 1 -> 0x0008 147 152 148 * ''' ''gal_flag:''''' (0,1 : not extended) anything except 0 or 1 -> 0x0080153 * '''gal_flag:''' (0,1 : not extended) anything except 0 or 1 -> 0x0080 149 154 150 * ''' ''mp_flag:''''' anything except 0 or 1 -> 0x0800155 * '''mp_flag:''' anything except 0 or 1 -> 0x0800 151 156 152 * ''' ''dup_flag:''''' anything except 0 or 1 -> 0x1000157 * '''dup_flag:''' anything except 0 or 1 -> 0x1000 153 158 154 * ''' ''use_flag:''''' anything except 0 or 1 -> 0x2000159 * '''use_flag:''' anything except 0 or 1 -> 0x2000
