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ZUB07 - Methanol Masers Observations in the 3-mm Bandwidth at the Radio Telescope RT-22 CrAO

Short title: Zubrin et al. (2007)
Authors: Zubrin, S. Yu. Antyufeyev, A. V. Myshenko, V. V. Shulga, V. M.
Journal: YSC 14 Proceedings of Contributed Papers (eds. G. Ivashchenko, A. Golovin), pp. 95-98
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Abstract
We report the beginning of the astronomical masers investigations in the 3-mm bandwidth at the radio telescope RT-22 (CrAO, Ukraine). For this purpose the special complex for maser lines investigation in 85...115 GHz frequency band is developed. It is made on the base of the low noise cryogenic Shottky-diode receiver and the high resolution Fourier-spectrometer. The cryogenic receiver has the DSB noise temperature less than 100K. The spectral channel separation of the Fourier-spectrometer is about 4kHz and the spectrometer bandwidth is 8 MHz. Results of maser observations of 8^{0}-7^{1} A^{ +} transition of methanol (95.169GHz) towards DR-21(OH), DR-21W and NGC7538 are in good agreement with early obtained results by other authors. On the basis of the analysis of the location of masers in the NGC7538 direction we can assume that the origin of all known class I methanol masers in this region is connected with existing molecular outflows from young stars.

Abstract

We report the beginning of the astronomical masers investigations in the 3-mm bandwidth at the radio telescope RT-22 (CrAO, Ukraine). For this purpose the special complex for maser lines investigation in 85...115 GHz frequency band is developed. It is made on the base of the low noise cryogenic Shottky-diode receiver and the high resolution Fourier-spectrometer. The cryogenic receiver has the DSB noise temperature less than 100K. The spectral channel separation of the Fourier-spectrometer is about 4kHz and the spectrometer bandwidth is 8 MHz. Results of maser observations of 8^{0}-7^{1} A^{ +} transition of methanol (95.169GHz) towards DR-21(OH), DR-21W and NGC7538 are in good agreement with early obtained results by other authors. On the basis of the analysis of the location of masers in the NGC7538 direction we can assume that the origin of all known class I methanol masers in this region is connected with existing molecular outflows from young stars.

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Detection table from Zubrin et al. (2007)

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ID	Obs. RA	Obs. Dec	l	b	Source name	Line	V_peak	FWHM	F_peak	Telescope	Beam
	(J2000)	(J2000)	(deg.)	(deg.)		CH₃OH (class I)	(km/s)	(km/s)	(Jy)		(arcsec)
1	23 13 46.5	+61 27 32.7	111.5404	0.7663	NGC7538	95 GHz (I)	-57.44	0.75	21	RT22_CrAO	40
2	20 38 59.2	+42 22 48.7	81.7183	0.5755	DR21(OH)	95 GHz (I)	0.16	0.73	136	RT22_CrAO	40
3	20 38 54.6	+42 19 23.5	81.6644	0.5521	DR21-W	95 GHz (I)	-2.69	1.18	52	RT22_CrAO	40

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IRAS source	IRAS coordinates (RA, Dec)	IRAS flux density (F12,F25,F60,F100)
2MASS source	2MASS coordinates (RA, Dec)	2MASS magnituted (J,H,K)

Variable star	Variable star parameters	Star Formation Region name	Star Formation Region parameters
WISE source	WISE coordinates (RA, Dec)	WISE magnitudes (w1, w2, w3, w4)
Akari IRC source	Akari IRC coordinates (RA, Dec)	Akari IRC fluxes (S09, S18)
Akari FIS source	Akari FIS coordinates (RA, Dec)	Akari FIS fluxes (S65, S90, S140, S160)

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DSS (optical)	2MASS (JHK)	WISE (4-22 um)	IRAC (3-8 um)	GLIMPSE 360 (3.6-4.5 um)	PACS color (70-160 um)	SPIRE color (250-500 um)
AKARI color (60-160 um)	NVSS (1.4 GHz)	SDSS (optical+NIR)	Image size: arcsec (default is 120 arcsec)
			Image size: arcsec (default is 120 arcsec)

Position of H₂O maser detection

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)
UKIDSS K	2MASS K

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ZUB07 - Methanol Masers Observations in the 3-mm Bandwidth at the Radio Telescope RT-22 CrAO

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Detection table from Zubrin et al. (2007)