HSC Search Output Columns

This document defines the catalog entries describing the HSC Data Archive.

Clicking on entries in this column will mark the entry for retrieval. To mark all entries, click one of the buttons labelled 'Mark All','Mark public', or 'Mark Proprietary'. (Unmarking all entries can be done the same way using the appropriate button.) For missions with proprietary data, the mark button element will have a yellow background and a '@' symbol to indicate data sets not yet public.

To Retrieve:
Click the button labelled 'Submit marked data for retrieval from STDADS'. This will send all the marked data set names to the data retrieval page. Follow the directions on the displayed pages.

To Coplot:
After selecting up to 15 observations to be plotted, click on the "Plot marked spectra" button to coplot the selected observations.

The spectra that you selected will be automatically scaled to the full range of wavelengths and nearly the full range of fluxes (i.e., y axis plot scale runs from 0 (or .25 * the minimum flux for spectra with negative fluxes) to the 10th highest flux). Each spectrum is automatically assigned a color, up to a maximum of 15.

For plotting Kepler light curves, y-axis scaling is slightly different. Plots scale simply from the minimum to the maximum flux. It is also recommended that only Kepler light curves from the same target be co-plotted due to the differences in flux values.

The spectra are labelled by their dataset names, with a summary of the datasets plotted given below the plot. After inspecting the plot, you may wish to change the selection of datasets which are displayed. Use your browser "Back" button to do this.

Plot range
Adjust the minimum and maximum wavelengths (in Angstroms) and minimum and maximum fluxes (in erg /cm2/sec/A) to select the spectral region of interest and to exclude noisy data. Note Kepler light curves are in units of time and uncalibrated fluxes.

Plot dimensions
Adjust the X size and Y size in pixels to create the size of plot desired. The maximum dimensions are 850 by 640 pixels.

Redraw plot
Use this button to replot the spectra when you have changed the plot range or plot dimensions.

Column Information

Cat ID
Unique identifier for each catalog entry
Range: 1 to > 62081749

Match ID
Catalog entries with the same value of MatchID match together.
Range: 1 to > 27028396

Mem ID
Unique identifier for each member of a match
Range: 1 to > 346

Source ID
Another identifier
Range as of May 1st,2012 was 2102514166 to 4667808271

Value = Y is entry is detected and N if source is not detected.
Y or N

Image ID
Another identifier
Range 1 to > 1018479

Target Name
Target Name
Examples: NGC6341

Image Name
HLA image Name
Examples: HST_10120_04_ACS_WFC_F658N

Match RA (J2000)
Right Ascension for the match
Range 0 to 360 deg

Match DEC (J2000)
Declination for the match
Range: -90 to +90 deg

Source RA (J2000)
Right Ascension of entry for a detected source.
Range 0 to 360 deg, null is source was not detected.

Source DEC (J2000)
Declination of entry for a detected source.
Range: -90 to +90 deg, null is source was not detected.

Distance in mas from source position (SourceRA, SourceDec) to the match position (MatchRA, MatchDec).
Range: currently 0 to 81.49

D Sigma
Standard deviation in mas of source distances from the match position.
Range: currently 0 to 54.78

X position of source in image coordinates
Range: currently 12.67 to 7464.64

Y position of source in image coordinates
Range: currently 12.24 to 7328.75

Name of instrument
Examples: ACS

Observing Mode
Example: ACCUM

Example: ACS/WFC

Example: WFC1

Exp Time
Exposure Time
Range: currently 0.1 to 26400 sec

Obs. Start Time
Observation Start Time
Range currently 1989-11-30 to 2010-02-12

Start MJD
Observation Start Time (mjd)

Obs. Stop Time
Observation Stop Time
Range: currently 1993-12-20 to 2010-02-12

Stop MJD
Observation Stop Time (mjd)

Central wavelength in Angstroms
Range: currently 1322 to 10228 A

Examples: F625W

Flux in counts with an aperture radius of 3 pixels, 0.3 arcsec for WFPC2 and 0.15 arcsec for ACS.
Range: currently 0.001 to 10437600

Magnitude measured with an aperture radius of 3 pixels, 0.3 arcsec for WFPC2 and 0.15 arcsec for ACS.
Range: currently 1.85 to 35.98

Total magnitude for stellar sources (flags = 0)
Range: currently 2.24 to 28.60

HST proposal number
Examples: currently 1070 to 12007

Concentration Index of source defined as the difference between 0.3 and 0.1 arcsec aperture magnitudes.
Examples: currently 0.65 to 93.55

Value is 0 for a stellar (point) source, and 1 for an extended source.