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DEG95 - Search For Linear Polarization of Extreme High-Velocity Water Masers in NGC 4258

Short title: Deguchi et al. (1995)
Authors: Deguchi, ShujiNakai, NaomasaBarvainis, Richard
Journal: Astronomical Journal v.109, p.507
Bibcode:

Target type: High_mass_SFR

Abstract
We have measured the upper limit of linear polarization of water maser emission from NGC 4258. Water masers in NGC 4258 are composed of a broad central component of width about 100 km s^-1^ and spiky extreme high- velocity components on both higher and lower velocity sides of the central component by about 1000 km s^-1^. Several possible models for the extreme components have been proposed and may predict observable amounts of linear polarization unless Faraday depolarization quenches the linear polarization in the amplification process. We have found that the polarization degrees are less than about 20% for the extreme components and less than about 15% for the central velocity component. This finding suggests, under the restriction in some models, that strong Faraday rotation may be acting in the maser clouds to quench the linear polarization. The magnetic field strength required in two models is estimated. In each model, the estimated value does not exceed by much the value computed from magnetic flux conservation in spherical collapse of general interstellar clouds. We have also observed the water maser flare of the irregular galaxy IC10 and found no linear polarization in the flare component.

Abstract

We have measured the upper limit of linear polarization of water maser emission from NGC 4258. Water masers in NGC 4258 are composed of a broad central component of width about 100 km s^-1^ and spiky extreme high- velocity components on both higher and lower velocity sides of the central component by about 1000 km s^-1^. Several possible models for the extreme components have been proposed and may predict observable amounts of linear polarization unless Faraday depolarization quenches the linear polarization in the amplification process. We have found that the polarization degrees are less than about 20% for the extreme components and less than about 15% for the central velocity component. This finding suggests, under the restriction in some models, that strong Faraday rotation may be acting in the maser clouds to quench the linear polarization. The magnetic field strength required in two models is estimated. In each model, the estimated value does not exceed by much the value computed from magnetic flux conservation in spherical collapse of general interstellar clouds. We have also observed the water maser flare of the irregular galaxy IC10 and found no linear polarization in the flare component.

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Detection table from Deguchi et al. (1995)

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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(h2o_data_all.ra_hms) as ra_hms,MAX(h2o_data_all.dec_dms) as dec_dms,MAX(h2o_data_all.source_name) as source_name,MAX(h2o_data_all.ra) as ra,MAX(h2o_data_all.dec) as dec,MAX(h2o_data_all.l) as l,MAX(h2o_data_all.b) as b,MAX(h2o_data_all.grp) as grp,MAX(h2o_data_all.other_name) as other_name,MAX(h2o_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(h2o_data_all.line) as line,MAX(h2o_data_all.vrange) as vrange,MAX(h2o_data_all.vpeak) as vpeak,MAX(h2o_data_all.peak) as peak,MAX(h2o_data_all.fwhm) as fwhm,MAX(h2o_data_all.int) as int,MAX(h2o_data_all.rms) as rms,MAX(h2o_data_all.units) as units,MAX(h2o_data_all.units_rms) as units_rms,MAX(h2o_data_all.date_txt) as date_txt,MAX(h2o_data_all.telescope_ref) as telescope_ref,MAX(h2o_data_all.telescope_conf) as telescope_conf,MAX(h2o_data_all.v_step) as v_step,MAX(h2o_data_all.beam) as beam,MAX(h2o_data_all.beam_maj) as beam_maj,MAX(h2o_data_all.beam_min) as beam_min,MAX(h2o_data_all.beam_pa) as beam_pa,MAX(h2o_data_all.ref) as ref,MAX(h2o_data_all.list_ref) as list_ref,MAX(h2o_data_all.ascii) as ascii,MAX(h2o_data_all.url) as url,MAX(h2o_data_all.image) as image,MAX(h2o_data_all.image2) as image2,MAX(h2o_data_all.image3) as image3,MAX(h2o_data_all.descr) as descr,MAX(h2o_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(h2o_data_all.dist) as dist,1 as dist_parallax,MAX(h2o_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 h2o_data_all  LEFT JOIN all_objects_withmet ON h2o_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 h2o_data_all.line=transitions."Line"  WHERE ref ilike 'DEG95' AND detected=true AND hide=false GROUP BY ref

select h2o_data_all.ra_hms,h2o_data_all.dec_dms,h2o_data_all.source_name,h2o_data_all.ra,h2o_data_all.dec,h2o_data_all.l,h2o_data_all.b,h2o_data_all.grp,h2o_data_all.other_name,h2o_data_all.other_desc,h2o_data_all.thermal,h2o_data_all.line,h2o_data_all.vrange,h2o_data_all.vpeak,h2o_data_all.peak,h2o_data_all.fwhm,h2o_data_all.int,h2o_data_all.rms,h2o_data_all.units,h2o_data_all.units_rms,h2o_data_all.date_txt,h2o_data_all.telescope_ref,h2o_data_all.telescope_conf,h2o_data_all.v_step,h2o_data_all.beam,h2o_data_all.beam_maj,h2o_data_all.beam_min,h2o_data_all.beam_pa,h2o_data_all.ref,h2o_data_all.list_ref,h2o_data_all.ascii,h2o_data_all.url,h2o_data_all.image,h2o_data_all.image2,h2o_data_all.image3,h2o_data_all.descr,h2o_data_all.id,h2o_data_all.mjy_flag,h2o_data_all.rms_mjy_flag,h2o_data_all.dist,h2o_data_all.dist_parallax,h2o_data_all.date_txt,line_det,type,simbad_types_cat FROM h2o_data_all   LEFT JOIN all_objects_withmet ON h2o_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 h2o_data_all.line=transitions."Line"  WHERE ref ilike 'DEG95' AND detected=true AND hide=false ORDER BY detected DESC,id

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DEG95 - Search For Linear Polarization of Extreme High-Velocity Water Masers in NGC 4258

View as list of objects

Detection table from Deguchi et al. (1995)