VERA Fringe Survey — Search for more K-band calibrators with VERA


In 2005—2006 a survey search for bright compact radio sources at 22 GHz with the VERA radio-interferometer was made. Each source from a list of 2494 objects was observed in one scan for 2 minutes. The purpose of this survey was to find compact extragalactic sources bright enough at 22 GHz to be useful as phase calibrators. Observed sources were either a) within 6 degrees of the Galactic plane, or b) within 11 degrees from the Galactic center; or c) within 2 degrees from known water masers. Among the observed sources, 549 were detected, including 180 extragalactic objects which were not previously observed with the very long baseline interferometry technique. Estimates of the correlated flux densities of the detected sources are presented.

Results of this work were publused in paper L. Petrov, T. Hirota, M. Honma, S.M. Shibata, T. Jike, H. Kobayashi, VERA 22 GHz fringe search survey", Astronomical Journal, vol. 133, 2487, 2007.

Addtional details

14 observing sessions with VERA were performed in October-February 2005 for search of compact sources at K-band, primarily in the Galactic plane. 

                                                         Local solar time       Duration
======================================================================================
fss_01  r05284b    2005.10.11-08:20 2005.10.11-00:00   |      xxxxxxxx          |  7.0
fss_02  r05285b    2005.10.12-08:20 2005.10.12-00:00   |      xxxxxxxx          |  7.0
fss_03  r05332b,c  2005.11.28-12:20 2005.11.28-23:00   |            xxxxxxxxxxx | 10.8
fss_04  r05335b    2005.12.01-11:00 2005.12.19-23:30   |           xxxxxxxxxxxxx| 12.5
fss_05  r05343b    2005.12.09-15:00 2005.12.19-23:30   |               xxxxxxxxx|  8.5
fss_06  r05348a    2005.12.14-09:00 2005.12.14-23:30   |        xxxxxxxxxxxxxxxx| 14.0
fss_07  r05349     2005.12.15-10:00 2005.12.16-06:00   |xxxxx    xxxxxxxxxxxxxxx| 20.0
fss_08  r05350a    2005.12.16_07:00 2005.12.16-14:45   |     xxxxxxxxx          |  7.5
fss_09  r05350b    2005.12.16_14:55 2005.12.16_23:30   |              xxxxxxxxxx|  8.5
fss_10  r05353d    2005.12.19_04:00 2005.12.19-09:30   |   xxxxxx               |  5.5
fss_11  r05359d    2005.12.25_02:00 2005.12.25_11:00   | xxxxxxxx               |  7.0
fss_12  r06052b    2006.02.21_18:00 2006.02.22_07:00   |xxxxxxx           xxxxxx| 13.0
fss_13  r06054a    2006.02.23_19:00 2006.02.24_06:00   |xxxxxx             xxxxx| 11.0
fss_14  r06059b    2006.02.28_18:00 2006.03.01_10:00   |xxxxxxxxxx        xxxxxx| 16.0
======================================================================================
                                                                                 148.0

Correlated:
Exp    Date range of the expriment                      #obs #sca #sta

fss_01 2005.10.11-08:15:00.49  2005.10.11-14:53:00.39    372  124  3
fss_02 2005.10.11-08:15:00.49, 2005.10.12-14:56:00.26    750  125  4
fss_03 2005.10.12-08:16:00.49, 2005.11.28-22:59:35.82   1464  246  4
fss_04 2005.11.28-12:34:32.49, 2005.12.01-22:57:59.62   1698  283  4
fss_05 2005.12.09-15:11:00.49, 2005.12.09-23:29:07.66   1188  198  4
fss_06 2005.12.14-09:11:00.49, 2005.12.14-23:28:04.48   1003  337  3
fss_07 2005.12.15-10:11:00.49, 2005.12.16-05:58:00.08   1380  460  3
fss_08 2005.12.16-07:11:00.49, 2005.12.16-14:43:36.21    543  181  3
fss_09 2005.12.16-15:06:00.49, 2005.12.16-23:28:47.50    567  189  3
fss_10 2005.12.19-04:11:00.49, 2005.12.19-09:28:08.11    390  130  3
fss_11 2005.12.25-02:11:00.04, 2005.12.25-08:55:07.86    966  161  4
fss_12 2006.02.21-18:11:00.05, 2006.02.22-06:57:57.86   1764  294  4
fss_13 2006.02.23-19:11:00.04, 2006.02.24-05:57:45.91   1500  250  4
fss_14 2006.03.04-18:11:00.04, 2006.03.05-09:57:41.87   1962  327  4

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Results

Raw correlator output in FITS-IDI format is availble here.
Distribution of detected sources

Legend: black disks -- detected new sources; circles -- detected known sources.

Follow-up 22 GHz VLBA observations: (VLBI Galactic Plane Survey) (GaPS) and VERA Galactic Plane Survey GaPS-V were later made.

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This web page was prepared by Leonid Petrov ()
Last update: 2007.01.21_22:59:56