J/MNRAS/440/696     HI absorption in nearby radio galaxies   (Allison+, 2014)
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A search for HI absorption in nearby radio galaxies using HIPASS.
    Allison J.R., Sadler E.M., Meekin A.M.
   <Mon. Not. R. Astron. Soc., 440, 696-718 (2014)>
   =2014MNRAS.440..696A
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ADC_Keywords: Galaxies, nearby ; H I data ; Galaxies, radio
Keywords: methods: data analysis - galaxies: active - galaxies: ISM -
          galaxies: nuclei - radio lines: galaxies

Abstract:
    Using archival data from the Hi Parkes All-Sky Survey (HIPASS), we
    have searched for 21cm line absorption in 204 nearby radio and
    star-forming galaxies with continuum flux densities greater than
    S_1.4_~250mJy within the redshift range 0<cz<12000km/s. By applying a
    detection method based on Bayesian model comparison, we successfully
    detect and model absorption against the radio-loud nuclei of four
    galaxies, of which the Seyfert 2 galaxy 2MASX J130804201-2422581 was
    previously unknown. All four detections were achieved against compact
    radio sources, which include three active galactic nuclei (AGNs) and a
    nuclear starburst, exhibiting high dust and molecular gas content. Our
    results are consistent with the detection rate achieved by the recent
    ALFALFA (Arecibo Legacy Fast Arecibo L-band Feed Array) Hi absorption
    pilot survey by Darling et al. and we predict that the full ALFALFA
    survey should yield more than three to four times as many detections
    as we have achieved here. Furthermore, we predict that future all-sky
    surveys on the Square Kilometre Array precursor telescopes will be
    able to detect such strong absorption systems associated with type 2
    AGNs at much higher redshifts, providing potential targets for
    detection of H_2_O megamaser emission at cosmological redshifts.

Description:
    Our sample selection was driven by the brightest radio sources in the
    National Radio Astronomy Observatory Very Large Array Sky Survey
    (NVSS, {nu}=1.4GHz; Condon et al., 1998, Cat. VIII/65), the Sydney
    University Molonglo Sky Survey (SUMSS, {nu}=843MHz; Mauch et al.,
    2003, Cat. VIII/81) and the second epoch Molonglo Galactic Plane
    Survey (MGPS-2, {nu}=843MHz; Murphy et al., 2007, Cat. VIII/82).
    Together, the footprints of these three surveys fully overlap the sky
    coverage of HIPASS down to continuum flux densities of a few mJy.

File Summary:
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 FileName   Lrecl  Records   Explanations
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ReadMe         80        .   This file
tableb1.dat   137      204   Properties of 204 galaxies searched for
                              HI absorption in HIPASS
refs.dat       65       48   References
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See also:
   VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
   VIII/81 : Sydney University Molonglo Sky Survey (SUMSS V2.1) (Mauch+ 2008)
   VIII/82 : 2nd Epoch Molonglo Galactic Plane Survey (MGPS-2) (Murphy+, 2007)
   VIII/73 : HI Parkes All Sky Survey Catalogue (HIPASS) (Meyer+, 2004)
   VIII/89 : Northern HI Parkes All Sky Survey Catalogue (HIPASS) (Wong+, 2006)
 J/A+A/544/A18 : Radio galaxies of the local universe (van Velzen+, 2012)

Byte-by-byte Description of file: tableb1.dat
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   Bytes Format Units   Label  Explanations
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   1- 25  A25   ---     Name   Galaxy name
  27- 28  I2    h       RAh    Right ascension (J2000) (1)
  30- 31  I2    min     RAm    Right ascension (J2000)
  33- 37  F5.2  s       RAs    Right ascension (J2000)
      39  A1    ---     DE-    Declination sign (J2000) (1)
  40- 41  I2    deg     DEd    Declination (J2000)
  43- 44  I2    arcmin  DEm    Declination (J2000)
  46- 49  F4.1  arcsec  DEs    Declination (J2000)
  51- 55  I5    km/s    cz     [129/11980] Systemic redshift
  57- 59  I3    km/s  e_cz     ? rms uncertainty on cz
  61- 62  I2    ---     Ref    [1/48] Reference code, in refs.dat file
  64- 70  I7    mJy     S.84   ?=- SUMSS/MGPS-2 mean flux density at 843MHz (2)
  72- 76  I5    mJy   e_S.84   ?=- rms uncertainty on S843 (2)
  77- 81  I5    ---     n.84   ?=- Number of radio components in the
                                   SUMSS/MGPS-2 image (4)
  83- 88  I6    mJy     S1.4    ?=- NVSS total flux at 1.4GHz (3)
  90- 93  I4    mJy   e_S1.4    ?=- rms uncertainty on S1.4 (3)
  95- 98  I4    ---     n1.4    ?=- Number of radio components in the
                                    NVSS image (4)
 100-105  I6    mJy     SCHI    ?=- Beam-weighted flux density from the 1.4GHz
                                    CHIPASS compact source map (5)
 107-113  I7    mJy     S100    ?=- IRAS flux density at 100um (6)
 115-120  I6    mJy     S60     ?=- IRAS flux density at 60um (6)
 122-126  F5.2  mag     Ksmag   ?=- 2MASS Ks magnitude (7)
 128-131  I4    Jy.km/s SHI     ?=- Integrated HI emission from HIPASS (8)
     133  A1    ---     Mc      [jpgu] Morphological code  (9)
 135-137  A3    ---     Samp    Sample: 1=radio-optical, 2=van Velzen (10)
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Note (1): Right ascension and declination are given for the centre position
 used to extract the HIPASS spectrum.
Note (2): flux density at 843 MHz from the SUMSS/MGPS-2
  (Mauch et al., 2003, Cat. VIII/81; Murphy et al., 2007, Cat. VIII/82).
Note (3): total flux density at 1.4GHz from NVSS total flux density at 1.4GHz
  (Condon et al., 1998, Cat. VIII/65).
Note (4): from van Velzen et al. 2012. Note that where available
  we have used the SUMSS/MGPS-2 and NVSS total flux densities compiled by
  van Velzen et al. (2012, Cat. J/A+A/544/A18).
Note (5): beam-weighted flux density extracted within a single HIPASS beamwidth
  from the 1.4GHz CHIPASS (Continuum HIPASS) compact source map (Calabretta 
  et al., 2014PASA...31....7C).
Note (6): from the IRAS Faint Source, Point Source and Galaxy Catalogues
  (Beichman et al., 1988, Cat. II/274; Rice et al., 1988, Cat. VII/109;
   Knapp et al., 1989, Cat. J/ApJS/70/329; Moshir et al., 1992, Cat. II/156;
   Sanders et al., 2003, Cat. J/AJ/126/1607).
Note (7): Ks is the apparent Ks-band magnitude, within the 20mag/arcsec^2^
   isophote, from the 2MASS (Skrutskie et al., 2006, Cat. VII/233).
Note (8): from HIPASS (Koribalski et al. 2004, Cat. J/AJ/128/16,
  Meyer et al., 2004, Cat. VIII/73; Wong et al. 2006, Cat. VIII/89).
Note (9): The radio morphology classifications are as those given by
  van Velzen et al. 2012 (J/A+A/544/A18):
  p = point sources
  g = star-forming galaxies
  j = jets and lobes
  u = unknown
Note (10): samples are:
  1 = radio-optical matches with 6dF, CfA redshift survey, and NED
  2 = galaxies in van Velzen et al. 2012 (J/A+A/544/A18)
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Byte-by-byte Description of file: refs.dat
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   Bytes Format Units   Label     Explanations
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   1-  2  I2    ---     Ref       [1/48] Refence code
   4- 22  A19   ---     BibCode   Bibcode
  24- 44  A21   ---     Aut       Author's name
  46- 65  A20   ---     Com       Comments
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History:
    From electronic version of the journal

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(End)                                      Patricia Vannier [CDS]    19-Jan-2015