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Home All issues Volume 549 (January 2013) A&A, 549 (2013) A122 Full HTML
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Table 1

Maser positions, brightnesses, and corresponding synthesized beams.

Maser Feature Epoch of RA (J2000) Dec (J2000) I peak Major  ×  minor, PA
number observation (°′″) (Jy beam-1) (mas  ×  mas, deg)
H2O 1 2008 Nov. 23 18 47 34.31259 −01 12 46.6384 115 1.6  ×  0.8, −7
2009 Jan. 18 18 47 34.31257 −01 12 46.6394 144 1.6  ×  1.1, −1
2009 Mar. 18 18 47 34.31256 −01 12 46.6402 75 1.4  ×  1.0, 13
2009 May 18 18 47 34.31254 −01 12 46.6412 40 1.8  ×  1.1, 20
CH3OH 1 2009 Mar. 15 18 47 34.28652 −01 12 45.5777 8.3 7.8  ×  5.0, −17
2010 Mar. 11 18 47 34.28636 −01 12 45.5837 9.0 8.8  ×  4.6, −18
2011 Mar. 2 18 47 34.28625 −01 12 45.5879 10.9a 11.8  ×  3.3, −36
2012 Feb. 24 18 47 34.28610 −01 12 45.5934 10.1a 11.6  ×  3.3, −38
OH-1665 1 LCP 2008 Sep. 26 18 47 34.27583 −01 12 46.3282 4.0 19  ×  11, −3
OH-1667 1 LCP 2008 Sep. 26 18 47 34.27574 −01 12 46.3287 5.0 24  ×  15, 35

Notes. Column 1 indicates the maser species; Col. 2 gives the label number (and, for the OH masers, polarization) of the phase-reference feature, as reported in Tables 2–5; Col. 3 lists the observing date; Cols. 4 and 5 report the absolute position in Equatorial coordinates; Col. 6 gives the peak intensity; Col. 7 reports the (major and minor) FWHM size and PA of the naturally-weighted beam. The PA of the beam is defined east of north. The accuracy in the derived maser absolute positions is  ~1 mas in both Equatorial coordinates.

(a)

Peak intensity from the image restored using a beam with FWHM size of 8.3 mas  ×  4.8 mas at PA = −17°.

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