J/ApJ/768/37          Radio emission from SDSS quasars          (Condon+, 2013)
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Active galactic nucleus and starburst radio emission from optically selected
quasi-stellar objects.
    Condon J.J., Kellermann K.I., Kimball A.E., Ivezic Z., Perley R.A.
   <Astrophys. J., 768, 37 (2013)>
   =2013ApJ...768...37C
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ADC_Keywords: Magnitudes, absolute ; QSOs ; Radio continuum
Keywords: galaxies: active; galaxies: starburst; quasars: general;
          radio continuum: galaxies

Abstract:
    We used the 1.4GHz NVSS to study radio sources in two color-selected
    QSO samples: a volume-limited sample of 1313 QSOs defined by M_i_<-23
    in the redshift range 0.2<z<0.45 and a magnitude-limited sample of
    2471 QSOs with m_r_<=18.5 and 1.8<z<2.5. About 10% were detected above
    the 2.4mJy NVSS catalog limit and are powered primarily by active
    galactic nuclei (AGNs). The space density of the low-redshift QSOs
    evolves as {rho}{prop.to}(1+z)^6^. In both redshift ranges the
    flux-density distributions and luminosity functions of QSOs stronger
    than 2.4mJy are power laws, with no features to suggest more than one
    kind of radio source. Extrapolating the power laws to lower
    luminosities predicts the remaining QSOs should be extremely radio
    quiet, but they are not. Most were detected statistically on the NVSS
    images with median peak flux densities S_p_(mJy/beam){approx}0.3 and
    0.05 in the low- and high-redshift samples, corresponding to spectral
    luminosities log [L_1.4GHz_(W/Hz)]{approx}22.7 and 24.1, respectively.
    We suggest that the faint radio sources are powered by star formation
    at rates dM/dt~20M_{sun}_/yr in the moderate luminosity (median
    <M_i_>{approx}-23.4) low-redshift QSOs and dM/dt~500M_{sun}_/yr in the
    very luminous (<M_i_>{approx}-27.5) high-redshift QSOs. Such luminous
    starbursts [<log(L_IR_/L_{sun}_)>~11.2 and 12.6, respectively] are
    consistent with "quasar mode" accretion in which cold gas flows fuel
    both AGN and starburst.

Description:
    The SDSS DR7 QSO catalog (Schneider et al. 2010, VII/260) is complete
    to i=19.1mag over a solid angle {Omega}=2.66sr around the North
    Galactic Pole. It contains the small sample of 179 color-selected QSOs
    defined by Mi<-23 in the narrow redshift range 0.2<z<0.3 studied by
    Kimball et al. (2011ApJ...739L..29K) and the larger sample of 1313
    QSOs in the wider redshift range 0.2<z<0.45 discussed here. Note that
    these magnitudes were calculated for an H_0_=71km.s/Mpc {Lambda}CDM
    cosmology.

    The entire DR7 area is covered by the NVSS, whose source catalog is
    complete for statistical purposes above a peak flux density
    Sp~2.4mJy/beam at 1.4GHz. In the redshift range 0.2<z<0.45 the 45"
    FWHM (full width between half-maximum points) beam of the NVSS spans
    150-250kpc.

    We also chose a magnitude-limited sample of all 2471 color-selected
    DR7 QSOs brighter than m_r_=18.5 in the redshift range 1.8<z<2.5. The
    NVSS detected radio emission stronger than S=2.4mJy from only 191 (8%)
    of them (Table 3).

File Summary:
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 FileName   Lrecl  Records   Explanations
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ReadMe         80        .   This file
table1.dat     51      163   NVSS-detected QSOs, 0.2<z<0.45
table3.dat     51      191   NVSS-detected QSOs, 1.8<z<2.5
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See also:
 VIII/90 : The FIRST Survey Catalog, Version 12Feb16 (Becker+ 2012)
 VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
 VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
 J/AJ/141/182     : Radio and optical properties of QSOs (Kimball+, 2011)
 J/MNRAS/383/1513 : 2MASS, SDSS and FIRST fluxes of QSOs (Labita+, 2008)
 J/AJ/128/1002    : SDSS candidate type II quasars. II (Zakamska+, 2004)
 J/AJ/127/1959    : 1.4GHz emission of KISS emission-line gal. (Van Duyne+ 2004)
 J/AJ/125/2411    : SIRTF First-Look Survey (Condon+, 2003)
 J/AJ/108/1163    : Radio structure of Quasars (Kellermann+ 1994)
 J/MNRAS/263/425  : Low-z BQS Quasars (Miller+, 1993)
 J/ApJ/378/65     : 8.4GHz observations of compact starbursts (Condon+ 1991)

Byte-by-byte Description of file: table[13].dat
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   Bytes Format Units   Label     Explanations
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   1-  2  I2    h       RAh       SDSS Hour of Right Ascension (J2000)
   4-  5  I2    min     RAm       SDSS Minute of Right Ascension (J2000)
   7- 11  F5.2  s       RAs       SDSS Second of Right Ascension (J2000)
      13  A1    ---     DE-       SDSS Sign of the Declination (J2000)
  14- 15  I2    deg     DEd       SDSS Degree of Declination (J2000)
  17- 18  I2    arcmin  DEm       SDSS Arcminute of Declination (J2000)
  20- 23  F4.1  arcsec  DEs       SDSS Arcsecond of Declination (J2000)
  25- 30  F6.4  ---     z         SDSS-DR7 Redshift
  32- 38  F7.3  mag     iMag      [-30/-23] Absolute i band magnitude
  40- 45  F6.1  mJy     S1.4      [2.4/3259] NVSS flux density at 1.4 GHz
  47- 51  F5.2  [W/Hz]  logL1.4   [23.6/28.8] Log 1.4GHz luminosity
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History:
    From electronic version of the journal

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(End)                 Greg Schwarz [AAS], Emmanuelle Perret [CDS]    24-Nov-2014