util.sdss
Class Quasar

java.lang.Object
  util.sdss.Quasar

All Implemented Interfaces:

Comparable<Quasar>, Star

public class Quasar
extends Object
implements Star, Comparable<Quasar>

A data container to hold the quasar instances from Sloan Digital Sky Survey DR3 QSO Catalog that appear in the file dr1qso.txt along with emission lines locations.

Acknowledgment

Funding for the creation and distribution of the SDSS Archive has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Aeronautics and Space Administration, the National Science Foundation, the U.S. Department of Energy, the Japanese Monbukagakusho, and the Max Planck Society. The SDSS Web site is http://www.sdss.org/. The SDSS is managed by the Astrophysical Research Consortium (ARC) for the Participating Institutions. The Participating Institutions are The University of Chicago, Fermilab, the Institute for Advanced Study, the Japan Participation Group, The Johns Hopkins University, the Korean Scientist Group, Los Alamos National Laboratory, the Max-Planck-Institute for Astronomy (MPIA), the Max- Planck-Institute for Astrophysics (MPA), New Mexico State University, University of Pittsburgh, Princeton University, the United States Naval Observatory, and the University of Washington.

Field Summary

protected List<Line>	absorptionLines
String	altName
String	au
String	dec
protected List<Line>	emissionLines
static int	entries
int	fiber
String	first
String	firstSep
String	firstSN
String	gmag
String	gmagErr
String	h2mass
String	h2massErr
String	imag
String	imagErr
String	j2mass
String	j2massErr
String	k2mass
String	k2massErr
String	name
int	plate
String	ra
String	rmag
String	rmagErr
String	rosat
String	rosatSep
String	rosatSN
int	s_mjd
String	umag
String	umagErr
String	zem
static DecimalFormat	zFormatter
String	zmag
String	zmagErr

Constructor Summary

Quasar(double z)

Quasar(String aRow)

Method Summary

int	compareTo(Quasar aQuasar)
static float	convertToAirWavelength(float vacuumWavelength) Convert from vacuum wavelength to air wavelength (in angstroms).
static float	convertToVacuumWavelength(float airWavelength) Convert from air wavelength to vacuum wavelength (in angstroms).
List<Line>	getAbsorptionLines() Get a list of Line objects representing absorption lines
float[]	getArray(int row)
double	getDec()
List<Line>	getEmissionLines() Get a list of Line objects representing emission lines
File	getImageFile() Get the image file for this quasar
static File	getImageFile(int aPlate, int aFiber, int aJulianDate) Get the image file for the given plate fiber and julian date
float	getIntensity(float wavelength) Get the spectra intensity at the given positive wavelength, linear interpolation is performed between sample points.
float	getIntensity(int samplePoint) Get the spectra intensity at sample point.
double[]	getMagnitude()
double[]	getMagnitudeError(int aBand)
float[]	getNoise()
Integer	getPrimaryKey()
static Integer	getPrimaryKey(int aPlate, int aFiber)
double	getRa()
float[]	getSpectra()
File	getSpectraFile() Get the spectra file for this quasar
static File	getSpectraFile(int aPlate, int aFiber, int aJulianDate) Get the spectra file for the given plate fiber and julian date
static String	getSpectraImageFileName(int aPlate, int aFiber, int aJulianDate)
static URL	getSpectraImageURL(int aPlate, int aFiber, int aJulianDate)
float	getWavelength(float samplePoint) Get the vacuum wavelength corresponding to the fractional sample point, possibly in between sample points (in Angstroms).
float	getWavelength(int samplePoint) Get the vacuum wavelength corresponding to the sample point (in Angstroms).
protected void	getWavelengthParameters() Get the wavelength parameters n, coeff0 and coeff1 from the FITS spectra file.
float[]	getWavelengths() Get the vacuum wavelengths corresponding all the spectra points (in Angstroms).
double	getZem()
static List<Quasar>	readQuasars() Get a list of quasars from SDSS
void	showSpectra()
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

zFormatter

public static DecimalFormat zFormatter

name

public String name

ra

public String ra

dec

public String dec

zem

public String zem

umag

public String umag

umagErr

public String umagErr

gmag

public String gmag

gmagErr

public String gmagErr

rmag

public String rmag

rmagErr

public String rmagErr

imag

public String imag

imagErr

public String imagErr

zmag

public String zmag

zmagErr

public String zmagErr

au

public String au

first

public String first

firstSN

public String firstSN

firstSep

public String firstSep

rosat

public String rosat

rosatSN

public String rosatSN

rosatSep

public String rosatSep

j2mass

public String j2mass

j2massErr

public String j2massErr

h2mass

public String h2mass

h2massErr

public String h2massErr

k2mass

public String k2mass

k2massErr

public String k2massErr

s_mjd

public int s_mjd

plate

public int plate

fiber

public int fiber

altName

public String altName

emissionLines

protected List<Line> emissionLines

absorptionLines

protected List<Line> absorptionLines

entries

public static int entries

Constructor Detail

Quasar

public Quasar(double z)

Quasar

public Quasar(String aRow)

Method Detail

getPrimaryKey

public static Integer getPrimaryKey(int aPlate,
                                    int aFiber)

getPrimaryKey

public Integer getPrimaryKey()

getRa

public double getRa()

getDec

public double getDec()

getZem

public double getZem()

getMagnitude

public double[] getMagnitude()

getMagnitudeError

public double[] getMagnitudeError(int aBand)

compareTo

public int compareTo(Quasar aQuasar)

Specified by:

compareTo in interface Comparable<Quasar>

getSpectraFile

public File getSpectraFile()

Get the spectra file for this quasar

getSpectraFile

public static File getSpectraFile(int aPlate,
                                  int aFiber,
                                  int aJulianDate)

Get the spectra file for the given plate fiber and julian date

getSpectraImageFileName

public static String getSpectraImageFileName(int aPlate,
                                             int aFiber,
                                             int aJulianDate)

getSpectraImageURL

public static URL getSpectraImageURL(int aPlate,
                                     int aFiber,
                                     int aJulianDate)

getImageFile

public File getImageFile()

Get the image file for this quasar

getImageFile

public static File getImageFile(int aPlate,
                                int aFiber,
                                int aJulianDate)

Get the image file for the given plate fiber and julian date

readQuasars

public static List<Quasar> readQuasars()
                                throws IOException

Get a list of quasars from SDSS

Returns:

a list of quasars

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object

getEmissionLines

public List<Line> getEmissionLines()

Description copied from interface: Star

Get a list of Line objects representing emission lines

Specified by:

getEmissionLines in interface Star

getAbsorptionLines

public List<Line> getAbsorptionLines()

Description copied from interface: Star

Get a list of Line objects representing absorption lines

Specified by:

getAbsorptionLines in interface Star

getWavelengthParameters

protected void getWavelengthParameters()

Get the wavelength parameters n, coeff0 and coeff1 from the FITS spectra file.

getWavelength

public float getWavelength(float samplePoint)

Get the vacuum wavelength corresponding to the fractional sample point, possibly in between sample points (in Angstroms).

Parameters:

samplePoint - a floating point number representing the fractional sample point

Returns:

vacuum wavelength of the sample point or zero if out of range

getWavelength

public float getWavelength(int samplePoint)

Get the vacuum wavelength corresponding to the sample point (in Angstroms).

Parameters:

samplePoint - the sample point

Returns:

vacuum wavelength of the sample point or zero if out of range

getWavelengths

public float[] getWavelengths()

Get the vacuum wavelengths corresponding all the spectra points (in Angstroms).

Returns:

the vacuum wavelengths of all the sample points

convertToAirWavelength

public static float convertToAirWavelength(float vacuumWavelength)

Convert from vacuum wavelength to air wavelength (in angstroms). The conversion equation is from the SDSS DR3 web page.

Parameters:

vacuumWavelength - the vacuum wavelength in angstroms

Returns:

air wavelength of the given vacuum wavelength

convertToVacuumWavelength

public static float convertToVacuumWavelength(float airWavelength)

Convert from air wavelength to vacuum wavelength (in angstroms). Equation is from the IAU standard for conversion from air to vacuum wavelengths. (Morton: 1991, ApJS, 77, 119). Pre-condition: air wavelength > 2000 Å

Parameters:

airWavelength - the air wavelength in angstroms

Returns:

vacuum wavelength of the given air wavelength

getSpectra

public float[] getSpectra()

getIntensity

public float getIntensity(int samplePoint)

Get the spectra intensity at sample point.

Parameters:

samplePoint - the sample point

Returns:

the spectra intensity at the sample point

getIntensity

public float getIntensity(float wavelength)

Get the spectra intensity at the given positive wavelength, linear interpolation is performed between sample points.

Parameters:

wavelength - the wavelength at which the intensity is requested

Returns:

the spectra intensity at the wavelength

getNoise

public float[] getNoise()

getArray

public float[] getArray(int row)

showSpectra

public void showSpectra()