J/MNRAS/461/136        MMB Survey ex-OH catalogue                (Avison+, 2016)
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Excited-state hydroxyl maser catalogue from the methanol multibeam survey.
I. Positions and variability.
    Avison A., Quinn L.J., Fuller G.A., Caswell J.L., Green J.A., Breen S.L.,
    Ellingsen S.P., Gray M.D., Pestalozzi M., Thompson M.A., Voronkov M.A.
   <Mon. Not. R. Astron. Soc., 461, 136-155 (2016)>
   =2016MNRAS.461..136A    (SIMBAD/NED BibCode)
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ADC_Keywords: Galactic plane ; Masers ; Radio sources
Keywords: masers - surveys - stars: formation - ISM: molecules -
          Galaxy: structure

Abstract:
    We present the results of the first complete unbiased survey of the
    Galactic plane for 6035-MHz excited-state hydroxyl (ex-OH) masers
    undertaken as part of the methanol multibeam (MMB) survey. These
    observations cover the Galactic longitude ranges 186deg<l<60deg
    including the Galactic Centre. We report the detection of 127 ex-OH
    masers within the survey region, 47 being new sources. The positions
    of new detections were determined from interferometric observations
    with the Australia Telescope Compact Array. We discuss the association
    of 6035-MHz masers in our survey with the 6668-MHz masers from the MMB
    Survey, finding 37 likely CH_3_OH-ex-OH maser pairs with physical
    separations of <=0.03pc and 55 pairings separated by <=0.1pc.
    Using these we calculate for the first time an ex-OH maser
    lifetime of between 3.3x10^3^ and 8.3x10^3^yr. We also discuss
    the variability of the 6035-MHz masers and detection rates of
    counterpart 6030-MHz ex-OH masers (28 per cent of our sample having
    detection at both frequencies).

Description:
    The positioning observations of 47 new ex-OH sources were made with
    ATCA in 2009 January over three days. Observations were conducted with
    the ATCA in the 6C configuration (maximum baseline 6.0km). The
    observations were made centred on the ex-OH 6035-MHz transition, with
    2048 channels over a bandwidth of 4MHz. The data were flux density
    and bandpass calibrated using the ATCA standard sources PKS B1934-638
    and PKS B1921-293, respectively. Phase calibration was interleaved
    between on source observations of three to four maser sources which
    were close in position and velocity, using a calibration source local
    (typical offset <10{deg}) to that area of sky.

File Summary:
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 FileName      Lrecl  Records   Explanations
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ReadMe            80        .   This file
table1.dat       127      159   MMB Survey ex-OH catalogue
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Byte-by-byte Description of file: table1.dat
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   Bytes Format Units   Label     Explanations
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   1- 14  A14   ---     MMBOH     Name (LLL.lll+BB.bbbA)
                                   for MMBOH-LLL.lll+BB.bbbA (1)
  16- 17  I2    h       RAh       Right ascension (J2000) (2)
  19- 20  I2    min     RAm       Right ascension (J2000)
  22- 27  F6.3  s       RAs       Right ascension (J2000)
      29  A1    ---     DE-       Declination sign (J2000) (2)
  30- 31  I2    deg     DEd       Declination (J2000)
  33- 34  I2    arcmin  DEm       Declination (J2000)
  36- 41  F6.3  arcsec  DEs       Declination (J2000)
  43- 46  I4    MHz     Trans     [6030 6035] Transition (3)
  48- 68  A21   ---   r_Pos       Position reference (4)
  69- 74  F6.2  Jy      Speak     ?=- MX/(ATCA) or LHPC(Stokes (I))
                                   peak flux density in Trans frequency
  76- 82  F7.2  km/s    Vpeak     ?=- MX/(ATCA) or LHPC(Stokes (I))
                                   peak velocity in Trans frequency
      83  A1    ---   n_Speak     [i] i for Speak and Vpeak of
                                   LHPC(Stokes (I)) (5)
  84- 89  F6.1  km/s  b_Vpeak     ?=- Lower value of Vpeak velocity range (6)
      90  A1    ---     ---       [,]
  92- 97  F6.1  km/s  B_Vpeak     ?=- Upper value of Vpeak velocity range (6)
      98  A1    ---   n_Vpeak     [*] Note on Vpeak (7)
  99-104  F6.2  Jy      Speak2    ?=- MX RHCP  peak flux density in
                                   Trans frequency
 106-112  F7.2  km/s    Vpeak2    ?=- MX RHCP peak velocity in Trans frequency
 114-119  F6.1  km/s  b_Vpeak2    ?=- Lower value of Vpeak2 velocity range (6)
     120  A1    ---     ---       [,]
 122-127  F6.1  km/s  B_Vpeak2    ?=- Upper value of Vpeak2 velocity range (6)
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Note (1): Source name, which is defined as the source position in Galactic
  coordinates (rounded at the third decimal point).
Note (2): Source position in right ascension and declination (sources with
 positions from MMB observations have three decimal places in RA and two in Dec,
 all previously detected masers have two and one decimal accuracy,
 respectively).
Note (3): the ex-OH transition for the listed maser, counterpart 6030-MHz masers
 are listed directly below their 6035-MHz partner.
Note (4): Reference for the position listed, with the following abbreviations:
   ATCA 09 = our ATCA observation results from 2009
   ATCA 13 = our ATCA observation results from 2013 October
   ATCA 14 = our ATCA observation results from 2014 February
   CV95    = Caswell & Vaile (1995MNRAS.273..328C)
   C97     = Caswell (1997MNRAS.289..203C)
   C98     = Caswell (1998MNRAS.297..215C)
   C03     = Caswell (2003MNRAS.341..551C)
   C01     = Caswell (2001MNRAS.326..805C)
   PIGGY   = MMB "piggyback" data
Note (5): i for values for Stokes I (total intensity) flux density taken from
 the respective ATCA observation as these sources are not present in the nearest
 Parkes MX. As such only columns 7-9 are filled in.
Note (6): the ex-OH maser minimum-maximum velocity range over which emission is
 seen in the spectrum.
Note (7): Sources 333.136-0.432 and 333.135-0.431 have a blended spectrum
 preventing a complete velocity range to be estimated from the MX data.
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History:
    From electronic version of the journal

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(End)                                      Patricia Vannier [CDS]    04-Nov-2023