Access to Astronomical Catalogues

J/ApJ/666/806       SED of Spitzer quasars (QUEST)           (Netzer+, 2007)
Spitzer Quasar and ULIRG Evolution Study (QUEST).
II. The spectral energy distributions of Palomar-Green quasars.
    Netzer H., Lutz D., Schweitzer M., Contursi A., Sturm E., Tacconi L.J.,
    Veilleux S., Kim D.-C., Rupke D., Baker A.J., Dasyra K., Mazzarella J.,
    Lord S.
   <Astrophys. J., 666, 806-816 (2007)>
   =2007ApJ...666..806N
ADC_Keywords: QSOs ; Galaxies, IR ; Spectroscopy

Keywords: galaxies: active - galaxies: starburst - infrared: galaxies -
          quasars: emission lines

Abstract:
    This is the second paper studying the QSOs in the Spitzer QUEST
    sample. Previously we presented new PAH measurements and argued that
    most of the observed far-infrared (FIR) radiation is due to
    star-forming activity. Here we present spectral energy distributions
    (SEDs) by supplementing our data with optical, NIR, and FIR
    observations. We define two subgroups, of "weak FIR" and "strong FIR"
    QSOs, and a third group of FIR nondetections. Assuming a starburst
    origin for the FIR, we obtain "intrinsic" active galactic nucleus
    (AGN) SEDs by subtracting a starburst template from the mean SEDs. The
    resulting SEDs are remarkably similar for all groups.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        77       29   QSO sample and supplementary data
table2.dat        18      354   Average QSO SEDs


See also:
 J/AJ/131/1923 : Known quasars in the QUEST Variability Survey (Rengstorf+ 2006)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label      Explanations

   1- 11  A11   ---     Name       QSO name
  13- 20  A8    ---     OName      Other name
  22- 27  F6.4  ---     z          Redshift
  29- 33  F5.2  [10-7W] log(L5100)  Continuum luminosity λLλ at
                                    5100Å rest wavelength (1)
  35- 39  F5.2  mJy     SJ         Near-infrared flux in J band
  41- 45  F5.2  mJy     SH         Near-infrared flux in H band
  47- 51  F5.2  mJy     SK         Near-infrared flux in K band
  53- 58  F6.2  mJy     SL         ?=- Near-infrared flux in L band
  60- 66  A7    ---     Ref        Near-infrared fluxes references (2)
  68- 77  A10   ---     Class      Classification as far-infrared strong/weak
                                   (relative to the mid-infrared), or undetected

Note (1): from spectra by T. Boroson 2006, private communication.

Note (2): References as follows:
     2M = 2MASS magnitudes, extended source catalog (Jarrett et al.
          2000AJ....119.2498J, cat. VII/233); K20 isophotal magnitudes
          for slightly extended sources, point source catalog (II/246)
          magnitudes otherwise
    H82 = Hyland & Allen (1982MNRAS.199..943H)
    M83 = McAlary et al. (1983ApJS...52..341M)
    N87 = Neugebauer et al. (1987ApJS...63..615N)
    S89 = Sanders et al. (1989ApJ...347...29S).


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1-  6  F6.3  um      lambda    Rest wavelength
   8- 12  F5.3  ---     ObsF      ? Observed QSO SED, λF_λ_ (1)
  14- 18  F5.3  ---     IntF      Intrinsic AGN SED for FIR-weak QSOs,
                                   λFλ (2)

Note (1): Average observed SED of 28 PG QSOs (see Fig. 3, top, smoothed),
     in arbitrary units
Note (2): Average intrinsic AGN SED of 8 'FIR-weak' PG QSOs, after
     subtraction of a starburst component (see Fig. 6, right, smoothed), 
     in arbitrary units


History:
    From electronic version of the journal

References:
    Schweitzer et al., Paper I        2006ApJ...649...79S
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    14-Oct-2009