J/A+AS/143/269        6.7GHz methanol maser emission survey  (Szymczak+, 2000)
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A survey of the 6.7 GHz methanol maser emission from IRAS sources. I. Data.
    Szymczak M., Hrynek G., Kus A.J.
   <Astron. Astrophys. Suppl. Ser. 143, 269 (2000)>
   =2000A&AS..143..269S
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ADC_Keywords: Masers ; Surveys ; Radio sources ; Infrared sources

Keywords: masers - surveys - stars: formation - ISM: molecules -
          radio lines: ISM - HII regions

Abstract:
    We report the first results of a search for 6.7GHz methanol masers in
    the direction of 1399 IRAS objects north of declination -20° with
    the flux densities greater than 100 Jy at 60 µm and the flux
    density ratio F60/F25>1. Observations were made with the
    sensitivity of 1.7 Jy and the velocity resolution of 0.04km/s using
    the 32-m Torun radio telescope. Maser emission was found in 182
    sources, including 70 new detections. 32 new sources were identified
    with objects of radio emission associated with star-forming regions.
    Comparison of the present data set with other observations suggests
    that about 65% of methanol masers exhibit moderate or strong
    variations on time-scales of about 4 and 8 years.

Description:
    File table1 contains 182 methanol maser sources detected at 6.7GHz.
    The IRAS name, the start and end velocities of emission, the velocity
    of peak emission, the peak flux density, the integrated flux density,
    the epoch of observation and the discovery reference are given.
    The data were taken during 1999 using the 32m Torun radio telescope.
    The average sensitivity limit (3{sigma}) was 1.7Jy and the velocity
    resolution was 0.044km/s.
    File table2 contains the sources not detected with the 32m
    Torun radio telescope at 6.7GHz. The IRAS name, the 1{sigma} level,
    the epoch of observation and the IRAS name of possible contamination
    sources are given. The number of non-detections is 1217.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        47      182   List of detections
table2.dat        35     1239   List of non-detections


See also:
   J/A+AS/110/81   : Methanol masers towards IRAS sources (van der Walt+ 1995)
   J/A+AS/134/115  : Medicina 6.7GHz methanol masers survey (Slysh+ 1999)
   J/AZh/72/22     : A 95 GHz Survey of Methanol Masers (Valtts+, 1995)
   J/MNRAS/291/261 : Methanol maser of IRAS-selected sources (Walsh+ 1997)


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

   Bytes Format Units   Label     Explanations

   1- 10  A10   ----    IRAS      IRAS name
  12- 14  I3    km/s    Vstart    Start LSR velocity of emission
  16- 18  I3    km/s    Vend      End LSR velocity of emission
  20- 24  F5.1  km/s    Vpeak     LSR velocity of peak emission
  26- 31  F6.1  Jy      Speak     Peak flux density
  33- 38  F6.1  Jy.km/s Sint      Integrated flux density
  40- 44  A5    "MM/YY" Epoch     Epoch of observation  (Month/Year)
  46- 47  I2    ----    Ref       [1-11] Discovery reference (1)

Note (1): Discovery reference:
           1: this paper
           2: Menten (1991ApJ...380L..75M)
           3: MacLeod & Gaylard (1992MNRAS.256..519M)
           4: Gaylard & MacLeod (1993MNRAS.262...43G)
           5: Schutte et al. (1993MNRAS.261..783S)
           6: Caswell et al. (1995MNRAS.272...96C)
           7: van der Walt et al. (1995, Cat. J/A+AS/110/81)
           8: Lyder & Galt (1997AJ....113.1310L)
           9: Walsh et al. (1997, Cat. J/MNRAS/291/261)
          10: MacLeod et al. (1998AJ....116.2936M)
          11: Slysh et al. (1999, Cat. J/A+AS/134/115)


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

   Bytes Format   Units   Label     Explanations

   1- 10  A10     ----    IRAS      IRAS name
  12- 15  F4.2    Jy      1{sigma}  1 {sigma} level at 6.7GHz
  17- 24  A8   "DD/MM/YY" Epoch     Month of observation
  26- 35  A10     ----    Cont      Contamination source


Acknowledgements: Marian Szymczak 

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(End)                                        Patricia Bauer [CDS]    23-Mar-2000