6.7GHz methanol maser emission survey : J/A+AS/143/269

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Authors : Szymczak M. orcid , Hrynek G., Kus A.J. (hide) , Hrynek G., Kus A.J. et..al

VizieR DOI :
Bibcode : 2000A&AS..143..269S (ADS) (Simbad) (Objects)
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CDS Keywords : Masers; Surveys; Radio sources; Infrared sources
UAT : Astrophysical masers, Radio astronomy, Surveys, Radio sources, Infrared sources

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Inserted into VizieR : 27-Mar-2000
Last modification : 02-Apr-2000

A survey of the 6.7 GHz methanol maser emission from IRAS sources. I. Data. (2000)

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{deg} with the flux densities greater than 100 Jy at 60 {mu}m and the flux density ratio F_60_/F_25_>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. ...(more)
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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.
Marian Szymczak
  • 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)

                


                

                    

                


                

                    

                


                

                    
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