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SLY94 - The Parkes Survey of Methanol Masers at 44.07-GHz

Short title: Slysh et al. (1994)
Authors: Slysh, V. I. Kalenskii, S. V. Valtts, I. E. Otrupcek, R.
Journal: Monthly Notices of the Royal Astronomical Society, Vol. 268, NO. 2/MAY15, P. 464, 1994
Bibcode:

Target type: Class_II(6)
Transitions: OH_1665,CH3OH_9(I),CH3OH_36(I),CH3OH_44(I),CH3OH_95(I),CH3OH_107(I),CH3OH_6(II),CH3OH_12(II),CH3OH_108(II),CH3OH_157(II)

Abstract
A survey of the Class I methanol masers in the transition 7₀-6₁A⁺ at 44.07 GHz has been carried out with the Parkes radio telescope. About 250 positions were searched in the direction of Galactic H II regions, H₂O masers and 6.7-GHz Class II methanol masers. 55 new methanol emission sources at 44 GHz were detected, amongst which is the second strongest in the sky, M8E, with a flux density of 520 Jy. Most of the newly found sources are associated with H₂O, OH and 6.7-GHz methanol masers and presumably are located in the common regions of star formation. A strong anticorrelation between Class I and II methanol masers was discovered. The nature of the anticorrelation is such that strong Class I masers do not co-exist with strong Class II masers and, where Class I and II masers co-exist, they have different radial velocities. The anticorrelation may be a consequence of the pumping radiation field acting on the population inversion, which is different for the two classes of masers. We suggest that the definitions of Class I and II methanol masers should be based solely on their transitions, and not by relating them to a particular type of associated astronomical object, as was originally proposed by Batrla et al. and Menten.

Abstract

A survey of the Class I methanol masers in the transition 7₀-6₁A⁺ at 44.07 GHz has been carried out with the Parkes radio telescope. About 250 positions were searched in the direction of Galactic H II regions, H₂O masers and 6.7-GHz Class II methanol masers. 55 new methanol emission sources at 44 GHz were detected, amongst which is the second strongest in the sky, M8E, with a flux density of 520 Jy. Most of the newly found sources are associated with H₂O, OH and 6.7-GHz methanol masers and presumably are located in the common regions of star formation. A strong anticorrelation between Class I and II methanol masers was discovered. The nature of the anticorrelation is such that strong Class I masers do not co-exist with strong Class II masers and, where Class I and II masers co-exist, they have different radial velocities. The anticorrelation may be a consequence of the pumping radiation field acting on the population inversion, which is different for the two classes of masers. We suggest that the definitions of Class I and II methanol masers should be based solely on their transitions, and not by relating them to a particular type of associated astronomical object, as was originally proposed by Batrla et al. and Menten.

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Detection table from Slysh et al. (1994)

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DSS colored	2MASS colored	WISE colored
SDSS color	IRAC color I1,I2,I4	GLIMPSE 360
PACS color (70-160 um)	SPIRE color (250-500 um)	NVSS (1.4GHz)
ATLASGAL 870 um	ATLASGAL 870 um + Planck	Bolocam 1.1 mm
UKIDSS K Download UKIDSS K FITS	2MASS K Download 2MASS K FITS

select MAX(met1_data_all.ra_hms) as ra_hms,MAX(met1_data_all.dec_dms) as dec_dms,MAX(met1_data_all.source_name) as source_name,MAX(met1_data_all.ra) as ra,MAX(met1_data_all.dec) as dec,MAX(met1_data_all.l) as l,MAX(met1_data_all.b) as b,MAX(met1_data_all.grp) as grp,MAX(met1_data_all.other_name) as other_name,MAX(met1_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(met1_data_all.line) as line,MAX(met1_data_all.vrange) as vrange,MAX(met1_data_all.vpeak) as vpeak,MAX(met1_data_all.peak) as peak,MAX(met1_data_all.fwhm) as fwhm,MAX(met1_data_all.int) as int,MAX(met1_data_all.rms) as rms,MAX(met1_data_all.units) as units,MAX(met1_data_all.units_rms) as units_rms,MAX(met1_data_all.date_txt) as date_txt,MAX(met1_data_all.telescope_ref) as telescope_ref,MAX(met1_data_all.telescope_conf) as telescope_conf,MAX(met1_data_all.v_step) as v_step,MAX(met1_data_all.beam) as beam,MAX(met1_data_all.beam_maj) as beam_maj,MAX(met1_data_all.beam_min) as beam_min,MAX(met1_data_all.beam_pa) as beam_pa,MAX(met1_data_all.ref) as ref,MAX(met1_data_all.list_ref) as list_ref,MAX(met1_data_all.ascii) as ascii,MAX(met1_data_all.url) as url,MAX(met1_data_all.image) as image,MAX(met1_data_all.image2) as image2,MAX(met1_data_all.image3) as image3,MAX(met1_data_all.descr) as descr,MAX(met1_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(met1_data_all.dist) as dist,1 as dist_parallax,MAX(met1_data_all.date_txt) as date_txt,MAX(line_det) as line_det,MAX(type) as type,MAX(simbad_types_cat) as simbad_types_cat FROM met1_data_all  LEFT JOIN all_objects_withmet ON met1_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON met1_data_all.line=transitions."Line"  WHERE ref ilike 'SLY94' AND detected=true AND hide=false GROUP BY ref

select met1_data_all.ra_hms,met1_data_all.dec_dms,met1_data_all.source_name,met1_data_all.ra,met1_data_all.dec,met1_data_all.l,met1_data_all.b,met1_data_all.grp,met1_data_all.other_name,met1_data_all.other_desc,met1_data_all.thermal,met1_data_all.line,met1_data_all.vrange,met1_data_all.vpeak,met1_data_all.peak,met1_data_all.fwhm,met1_data_all.int,met1_data_all.rms,met1_data_all.units,met1_data_all.units_rms,met1_data_all.date_txt,met1_data_all.telescope_ref,met1_data_all.telescope_conf,met1_data_all.v_step,met1_data_all.beam,met1_data_all.beam_maj,met1_data_all.beam_min,met1_data_all.beam_pa,met1_data_all.ref,met1_data_all.list_ref,met1_data_all.ascii,met1_data_all.url,met1_data_all.image,met1_data_all.image2,met1_data_all.image3,met1_data_all.descr,met1_data_all.id,met1_data_all.mjy_flag,met1_data_all.rms_mjy_flag,met1_data_all.dist,met1_data_all.dist_parallax,met1_data_all.date_txt,line_det,type,simbad_types_cat FROM met1_data_all   LEFT JOIN all_objects_withmet ON met1_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON met1_data_all.line=transitions."Line"  WHERE ref ilike 'SLY94' AND detected=true AND hide=false ORDER BY detected DESC,id

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SLY94 - The Parkes Survey of Methanol Masers at 44.07-GHz

View as list of objects

Detection table from Slysh et al. (1994)