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CLE91 - Variability of Interstellar Hydroxyl Masers

Short title: Clegg & Cordes (1991)
Authors: Clegg, Andrew W.Cordes, James M.
Journal: Astrophysical Journal v.374, p.150
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Target type: OH
Observations category: variability
Facility type: single-dish
Transitions: OH_1665

Abstract
The spectra of 10 interstellar OH maser complexes were monitored in the 1665 MHz transition for variability on short (minutes-hours) and long (days-years) time scales. Eight of the sources exhibit short time scale variability in the relative amplitudes of the spectral features above that expected due to radiometer noise, and all sources for which multiepoch observations were made show variability on long time scales. Amplitudes of the short time scale fluctuations are typically 5-10 percent of the peak intensity and are as large as 20 percent. Over long time scale, the fluctuations range from 0 to nearly 100 percent in amplitude. The OH emission spectrum from a main-line OH/IR star was also monitored. Long time scale variability is noted, distinct from that caused by pulsations of the stellar pumping source, while no short time scale variability (above 5 percent) is apparent.

Abstract

The spectra of 10 interstellar OH maser complexes were monitored in the 1665 MHz transition for variability on short (minutes-hours) and long (days-years) time scales. Eight of the sources exhibit short time scale variability in the relative amplitudes of the spectral features above that expected due to radiometer noise, and all sources for which multiepoch observations were made show variability on long time scales. Amplitudes of the short time scale fluctuations are typically 5-10 percent of the peak intensity and are as large as 20 percent. Over long time scale, the fluctuations range from 0 to nearly 100 percent in amplitude. The OH emission spectrum from a main-line OH/IR star was also monitored. Long time scale variability is noted, distinct from that caused by pulsations of the stellar pumping source, while no short time scale variability (above 5 percent) is apparent.

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Detection table from Clegg & Cordes (1991)

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ID	Obs. RA	Obs. Dec	l	b	Group id	grpv	Source name	Image	Descr.	Line	Frequency	V_peak	Telescope	Beam	Detection	Class	Distance	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)						OH	(MHz)	(km/s)		(arcsec)	Yes/No		(kpc)	(kpc)
1	06 14 36.7	+13 49 42.4	196.4517	-1.6779	G196.454-1.677	G196.4539-1.6774	S269	Image	Descr	1665 MHz;	1665	?	Arecibo	180	+H₂O -CH₃OH I +CH₃OH II +OH	SFR	2.000		1988-1989
2	16 25 48.8	+18 53 32.3	35.3473	40.3459	G35.345+40.351	G35.3473+40.3459	U Her	Image	Descr	1665 MHz;	1665	?	Arecibo	180	+H₂O +OH +SiO	EVOLVED	0.500		1988-1989
3	17 19 18.8	+35 41 2.9	59.5271	33.2848	G59.527+33.285	G59.5271+33.2848	NGC 6334F	Image	Descr	1665 MHz;	1665	?	Arecibo	180	+OH		1.700		1988-1989
4	19 10 13.4	+09 06 12.2	43.1662	0.0112	G43.166+0.011	G43.1669+0.0106	W49N	Image	Descr	1665 MHz;	1665	?	Arecibo	180	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED	14.000		1988-1989
5	19 10 21.6	+09 05 1.9	43.1646	-0.0279	G43.166+0.011	G43.1648-0.0280	W49S			1665 MHz;	1665	?	Arecibo	180	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED	14.000		1988-1989
6	19 11 53.9	+09 35 50.4	43.7952	-0.1268	G43.795-0.127	G43.7955-0.1272	G43.8	Image	Descr	1665 MHz;	1665	?	Arecibo	180	+OH	SFR	2.700		1988-1989
7	19 13 22.1	+10 50 54.5	45.0715	0.1324	G45.072+0.132	G45.0712+0.1323	G45.1		Descr	1665 MHz;	1665	?	Arecibo	180	+OH		10.000		1988-1989
8	19 14 25.7	+11 09 29.9	45.4668	0.0456	G45.466+0.054	G45.4657+0.0453	G45.5	Image	Descr	1665 MHz;	1665	?	Arecibo	180	+OH		10.000		1988-1989
9	19 23 27.5	+14 30 28.8	49.4570	-0.3297	G49.457-0.330	G49.4570-0.3297	W51	Image	Descr	1665 MHz;	1665	?	Arecibo	180	+OH		7.000		1988-1989
10	20 10 09	+31 31 35.4	69.5400	-0.9756	G69.540-0.976	G69.5399-0.9757	ON 1		Descr	1665 MHz;	1665	?	Arecibo	180	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	3.500		1988-1989
11	20 39 1.1	+42 22 49.9	81.7221	0.5710	G81.718+0.571	G81.7215+0.5721	W75S	Image	Descr	1665 MHz;	1665	?	Arecibo	180	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR	2.000		1988-1989

DSS colored	2MASS colored	WISE colored
PACS color (70-160 um)	SPIRE color (250-500 um)	GLIMPSE 360
SDSS color	IRAC color I1,I2,I4	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(oh_data_all.ra_hms) as ra_hms,MAX(oh_data_all.dec_dms) as dec_dms,MAX(oh_data_all.source_name) as source_name,MAX(oh_data_all.ra) as ra,MAX(oh_data_all.dec) as dec,MAX(oh_data_all.l) as l,MAX(oh_data_all.b) as b,MAX(oh_data_all.grp) as grp,MAX(oh_data_all.grpv) as grpv,MAX(oh_data_all.other_name) as other_name,MAX(oh_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(oh_data_all.line) as line,MAX(oh_data_all.freq) as freq,MAX(oh_data_all.pol) as pol,MAX(oh_data_all.vi) as vi,MAX(oh_data_all.var_type) as var_type,MAX(oh_data_all.vrange) as vrange,MAX(oh_data_all.vpeak) as vpeak,MAX(oh_data_all.peak) as peak,MAX(oh_data_all.fwhm) as fwhm,MAX(oh_data_all.int) as int,MAX(oh_data_all.rms) as rms,MAX(oh_data_all.units) as units,MAX(oh_data_all.units_rms) as units_rms,MAX(oh_data_all.date_txt) as date_txt,MAX(oh_data_all.telescope_ref) as telescope_ref,MAX(oh_data_all.telescope_conf) as telescope_conf,MAX(oh_data_all.v_step) as v_step,MAX(oh_data_all.beam) as beam,MAX(oh_data_all.beam_maj) as beam_maj,MAX(oh_data_all.beam_min) as beam_min,MAX(oh_data_all.beam_pa) as beam_pa,MAX(oh_data_all.ref) as ref,MAX(oh_data_all.list_ref) as list_ref,MAX(oh_data_all.ascii) as ascii,MAX(oh_data_all.url) as url,MAX(oh_data_all.image) as image,MAX(oh_data_all.image2) as image2,MAX(oh_data_all.image3) as image3,MAX(oh_data_all.descr) as descr,MAX(oh_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(oh_data_all.dist) as dist,1 as dist_parallax,MAX(oh_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 oh_data_all  LEFT JOIN all_objects_withmet ON oh_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 oh_data_all.line=transitions."Line"  WHERE ref ilike 'CLE91' AND detected=true AND hide=false GROUP BY ref

select oh_data_all.ra_hms,oh_data_all.dec_dms,oh_data_all.source_name,oh_data_all.ra,oh_data_all.dec,oh_data_all.l,oh_data_all.b,oh_data_all.grp,oh_data_all.grpv,oh_data_all.other_name,oh_data_all.other_desc,oh_data_all.thermal,oh_data_all.line,oh_data_all.freq,oh_data_all.pol,oh_data_all.vi,oh_data_all.var_type,oh_data_all.vrange,oh_data_all.vpeak,oh_data_all.peak,oh_data_all.fwhm,oh_data_all.int,oh_data_all.rms,oh_data_all.units,oh_data_all.units_rms,oh_data_all.date_txt,oh_data_all.telescope_ref,oh_data_all.telescope_conf,oh_data_all.v_step,oh_data_all.beam,oh_data_all.beam_maj,oh_data_all.beam_min,oh_data_all.beam_pa,oh_data_all.ref,oh_data_all.list_ref,oh_data_all.ascii,oh_data_all.url,oh_data_all.image,oh_data_all.image2,oh_data_all.image3,oh_data_all.descr,oh_data_all.id,oh_data_all.mjy_flag,oh_data_all.rms_mjy_flag,oh_data_all.dist,oh_data_all.dist_parallax,oh_data_all.date_txt,line_det,type,simbad_types_cat FROM oh_data_all   LEFT JOIN all_objects_withmet ON oh_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 oh_data_all.line=transitions."Line"  WHERE ref ilike 'CLE91' AND detected=true AND hide=false ORDER BY detected DESC,id

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CLE91 - Variability of Interstellar Hydroxyl Masers

View as list of objects

Detection table from Clegg & Cordes (1991)