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SLY01 - Space-VLBI observations of the OH maser OH34.26+0.15: low interstellar scattering

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Short title: Slysh et al. (2001)
Authors: Slysh, V. I.Voronkov, M. A.Migenes, V.Shibata, K. M.Umemoto, T.Altunin, V. I.Val'tts, I. E.Kanevsky, B. Z.Popov, M. V.Kovalenko, A. V.Fomalont, E. B.Poperechenko, B. A.Gorshenkov, YU. N.Carlson, B. R.Dougherty, S. M.Reynolds, J. E.Jiang, D. R.Smirnov, A. I.Grachev, V. G.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 320, Issue 2, pp. 217-223.
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Target type: HII
Observations category: SF.general
Facility type: interferometer
Transitions: OH_1665,OH_1667

Abstract
We report on the first space-VLBI observations of the OH34.26+0.15 maser in two main-line OH transitions at 1665 and 1667MHz. The observations involved the space radio telescope on board the Japanese satellite HALCA and an array of ground radio telescopes. The map of the maser region and images of individual maser spots were produced with an angular resolution of 1mas, which is several times higher than the angular resolution available on the ground. The maser spots were only partly resolved and a lower limit to the brightness temperature 6×10¹²K was obtained. The maser seems to be located in the direction of low interstellar scattering, an order of magnitude lower than the scattering of a nearby extragalactic source and pulsar.

Abstract

We report on the first space-VLBI observations of the OH34.26+0.15 maser in two main-line OH transitions at 1665 and 1667MHz. The observations involved the space radio telescope on board the Japanese satellite HALCA and an array of ground radio telescopes. The map of the maser region and images of individual maser spots were produced with an angular resolution of 1mas, which is several times higher than the angular resolution available on the ground. The maser spots were only partly resolved and a lower limit to the brightness temperature 6×10¹²K was obtained. The maser seems to be located in the direction of low interstellar scattering, an order of magnitude lower than the scattering of a nearby extragalactic source and pulsar.

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Detection table from Slysh et al. (2001)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	grpv	#	Source name	Line	Frequency	V_peak	F_peak	Major	Minor	PA	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)					OH	(MHz)	(km/s)	(Jy)	(arcsec)	(arcsec)	(deg.)	Yes/No		(kpc)
1	+18 53 18.685	+01 14 59.9			34.257931	0.153179	G34.257+0.153	G34.2575+0.1531		34.26+0.15	1665 MHz;	1665	56 .. 61.3	0.6 .. 10.5				+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1998 March 24-25
	+18 53 18.685	+01 14 59.8992	0 mas	0 mas	34.257930	0.153179			1	34.26+0.15		1665	56	10.5	0.002	0.001	70.000
	+18 53 18.6481	+01 14 58.0262	-553 mas	-1873 mas	34.257397	0.153079			2	34.26+0.15		1665	58.15	0.6	0.004	0.003	88.000
	+18 53 18.6478	+01 14 58.0322	-557 mas	-1867 mas	34.257398	0.153081			3	34.26+0.15		1665	58.15	2.9	0.006	0.002	156.000
	+18 53 18.6481	+01 14 58.0302	-553 mas	-1869 mas	34.257398	0.153079			4	34.26+0.15		1665	58.19	0.6	0.003	0.003
	+18 53 18.6498	+01 14 58.0352	-528 mas	-1864 mas	34.257403	0.153074			5	34.26+0.15		1665	58.25	0.6	0.003	0.002	33.000
	+18 53 18.671	+01 15 0.1412	-210 mas	242 mas	34.257964	0.153262			6	34.26+0.15		1665	58.63	2.1	0.003	0.000	70.000
	+18 53 18.6522	+01 15 0.0362	-491 mas	137 mas	34.257902	0.153318			7	34.26+0.15		1665	58.98	1.7	0.002	0.002
	+18 53 18.6481	+01 14 58.0332	-553 mas	-1866 mas	34.257399	0.153080			8	34.26+0.15		1665	61.3	1	0.002	0.001	88.000
2	+18 53 18.685	+01 14 59.9			34.257931	0.153179	G34.257+0.153	G34.2575+0.1531		34.26+0.15	1667 MHz;	1667	57.63 .. 58.95	4.5 .. 21.3				+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1998 March 24-25
	+18 53 18.595	+01 14 56.3692	-1350 mas	-3530 mas	34.256887	0.153066			1	34.26+0.15		1667	57.63	4.5	0.005	0.003	150.000
	+18 53 18.6483	+01 14 58.0092	-550 mas	-1890 mas	34.257394	0.153076			2	34.26+0.15		1667	58.65	19.7	0.007	0.003	155.000
	+18 53 18.6481	+01 14 58.0112	-553 mas	-1888 mas	34.257394	0.153077			3	34.26+0.15		1667	58.7	21.3	0.003	0.003
	+18 53 18.6481	+01 14 58.0142	-553 mas	-1885 mas	34.257394	0.153077			4	34.26+0.15		1667	58.75	19.7	0.005	0.002	112.000
	+18 53 18.6484	+01 14 58.0632	-549 mas	-1836 mas	34.257407	0.153082			5	34.26+0.15		1667	58.95	19	0.007	0.004	170.000

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

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.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 'SLY01' 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.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 'SLY01' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

SLY01 - Space-VLBI observations of the OH maser OH34.26+0.15: low interstellar scattering

Interferometry data

View as list of objects

Detection table from Slysh et al. (2001)