2000A&A...353...25M


Query : 2000A&A...353...25M

2000A&A...353...25M - Astronomy and Astrophysics, volume 353, 25-40 (2000/1-1)

Soft X-ray AGN luminosity function from ROSAT surveys. I. Cosmological evolution and contribution to the soft X-ray background.

MIYAJI T., HASINGER G. and SCHMIDT M.

Abstract (from CDS):

We investigate the evolution of the 0.5-2keV soft X-ray luminosity function (SXLF) of active galactic nuclei (AGN) using results from ROSAT surveys of various depth. The large dynamic range of the combined sample, from shallow large-area ROSAT All-Sky Survey (RASS)-based samples to the deepest pointed observation on the Lockman Hole, enabled us to trace the behavior of the SXLF. The combined sample includes about 690 AGNs. As previously found, the SXLF evolves rapidly as a function of redshift up to z∼1.5 and is consistent with remaining constant beyond this redshift. We have tried to find a simple analytical description of the SXLF in the overall redshift and luminosity range, using Maximum-Likelihood fits and Kolgomorov-Smirnov tests. We found that a form of the Luminosity-Dependent Density Evolution (LDDE), rather than the classical Pure Luminosity Evolution (PLE) or the Pure Density Evolution (PDE) models, gives an excellent fit to the data. Extrapolating one form of the LDDE model (LDDE1) explains ≃60% of the estimated soft extragalactic Cosmic X-ray Background (CXRB). We have also found another representation (LDDE2), which produces ≃90% of the CXRB and still gives an excellent fit to the sample AGNs. These two versions of the LDDE models can be considered two extremes of the possible extrapolations of the SXLF below the flux limit of the survey. We have also investigated the evolution of the number density of luminous QSOs with LogLx>44.5 [h50erg/s], where the evolution can be traced up to the high luminosity. We have compared the results with similar quantities in optically- and radio-selected luminous QSOs. Unlike these QSOs, evolution of the ROSAT-selected QSOs does not show evidence for the decrease of the number density in z>3. The statistical significance of the difference is, however, marginal.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: evolution - galaxies: quasars: general - cosmology: diffuse radiation - X-rays: galaxies - X-rays: general

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 [VV2006] J180204.8+662913 QSO 18 02 07.0 +66 29 07           ~ 7 1

Query : 2000A&A...353...25M

Basic data :
[VV2006] J180204.8+662913 -- Quasar
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
X (RX,1RXS), QSO ([VV2006]), AGN ([VV2010c])
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
18 02 07.0 +66 29 07 (Optical) [ ] D 2013PASA...30....4F
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
18 02 06.7 +66 28 58 [ ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
096.2982 +29.6003 [ ]
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) 69203 [~] / z(~) 0.265 [~] / cz 79445 [~]
   D 2003ApJS..149...29G
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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sedIcon
within arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR.
The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!).
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Some important notes on this object about identifications and objects associations.
notes:

  • According to Flesch (2013PASA...30....4F), the position of the AGN [VV2010c] J180204.8+662913 in Veron-Cetty and Veron (2010A&A...518A..10V) is 14" off; the correct position would be 18 02 07.0 +66 29 07.


The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (5) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

[VV2006] J180204.8+662913 RX J1802.1+6629 [VV2010c] J180204.8+662913
RX J1802.0+6629 1RXS J180205.9+662902

References (7 between 1850 and 2022) (Total 7)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : [VV2006] J180204.8+662913

Link by name to the catalogue in VizieR :

1RXS J180205.9+662902

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2022.05.25-22:16:25

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