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Example M81/M82 galaxy group map produced from a GBT observation

GBT Observations

Glen Langston and Kate Rubin observed M81/M82 group of galaxies with the GBT, during the summer of 2003. The images covered a large angular range, from RA range 6h30m to 10h45m, and declination range 64d to 74d. Two smaller maps were produced for a 2d x 2d region centered on M81. In the example below, we show the data reduction process for one map in this 2d x 2d region.

These observations were intended to fill a gap in GBT maintenance time, during a period of GBT track repair. The GBT project Id is 03B_034. The observations were carried out over 5 days. The observing logs are tabulated below:

• 2003 June 12 Observations: Two 2x2 maps
• 2003 June 13 Observations
• 2003 June 14 Observations
• 2003 June 15 Observations
• 2003 June 16 Observations Calibration and Absorption line search

GBTIDL

The data were averaged, calibrated, flagged by Katie Chynoweth and Glen Langston in summer 2007. The calibration process used some specialized IDL scripts, included below:

idlToSdfits

After calibration the data were flagged and re-formated for AIPS using idlToSdfits.

AIPS

Each of the individually calibrated, flagged and baseline subtracted data sets were input to AIPS. Within AIPS, the data were examined using the following AIPS tasks.

1. UVLOD
2. PRTSD
3. DBCON
4. SDIMG
5. TVLOD

In this example, we image 201 channels in the velocity range

RECUBE.001

The foreground emission from our galaxy (and associated high velocity clouds) contaminate the observation of M81/M82. We chose to interpolate across regions containing Galactic emission, which is found in the velocity range -85 to 25 km/sec. We have written an AIPS script to break an image cube into individual planes, then interpolate between selected ranges and re-build the cube. The AIPS script RECUBE? defines the AIPS proceedures.

1. CUBEINFO: Get the axis definitions
2. CUBEPUT: Put the axis definitions in another cube
3. DECUBE: Break an image cube into individual planes
4. INTERCUBE( ISTART, ISTOP): Interpolate over planes ISTART to ISTOP with planse ISTART-1 to ISTOP+1
5. RECUBE: Put the interpolated cube back together

archiveFind M81

The linux script archiveFind searches a data base, maintained by Glen Langston, that has a ASCII summary of every GBT observation. The archiveFind script does a string search on all of the data base entries. Up to three arguments may be given to archiveFind (ie archiveFind M81 Map Langston would find all the m81 mapping observations by Langston).

planck{glangsto}101: archiveFind m81
AGBT03B_034_01:    1     2        M81      OffOn       test   2   9h55m33  69d03'56     6  Thacker/Langst  1444.703   10.6 ACS 2003_06_12_04:19:58
AGBT03B_034_01:    3     4        M81      OffOn       test   2   9h55m33  69d03'55     6  Thacker/Langst  1444.703   10.6 ACS 2003_06_12_04:22:15
AGBT03B_034_01:    5     6        M81      OffOn       test   2   9h55m33  69d03'56     6  Thacker/Langst  1420.656   12.5 ACS 2003_06_12_04:24:47
AGBT03B_034_01:    7     8        M81      OffOn       test   2   9h55m33  69d03'56     6  Thacker/Langst  1420.656   12.5 ACS 2003_06_12_04:27:05
AGBT03B_034_01:    9    10        M81      OffOn       test   2!  9h55m33  69d03'55     3  Thacker/Langst  1420.656    0.0     2003_06_12_04:29:17
AGBT03B_034_01:   11    12        M81      OffOn       test   2   9h55m33  69d03'55     6  Thacker/Langst  1420.656   12.5 ACS 2003_06_12_04:31:26
AGBT03B_034_01:   13    23        M81  RALongMap       test  11   9h55m29  69d23'56   220  Thacker/Langst  1420.656   12.5 ACS 2003_06_12_04:39:13
AGBT03B_034_01:   24    25        M81      OffOn       test   2   9h55m33  69d03'56    12  Thacker/Langst  1420.406   50.0 ACS 2003_06_12_05:04:48
AGBT03B_034_01:   26    27        M81      OffOn       test   2   9h55m33  69d03'56    12  Thacker/Langst  1432.703   34.6 ACS 2003_06_12_05:08:35
AGBT03B_034_01:   28    29        M81      OffOn       test   2   9h55m33  69d03'56    12  Thacker/Langst  1410.406   50.0 ACS 2003_06_12_05:11:07
AGBT03B_034_01:   30    60        M81  RALongMap       test  31   9h55m27  70d03'56  1488  Thacker/Langst  1410.406   50.0 ACS 2003_06_12_05:14:29
AGBT03B_034_01:   61    91        M81  RALongMap       test  31   9h55m20  70d03'55  1488  Thacker/Langst  1410.406   50.0 ACS 2003_06_12_07:24:25
AGBT03B_034_01:   92   110        M81  RALongMap       test  31!  9h55m24  69d15'55   912  Thacker/Langst  1410.406   50.0 ACS 2003_06_12_09:34:19
AGBT03B_034_02:    1     2        M81      OffOn       test   2   9h55m33  69d03'56     6  Rubin/Langston  1410.381   50.0 ACS 2003_06_13_07:16:55
AGBT03B_034_02:    3     4        M81      OffOn       test   2   9h55m33  69d03'56     6  Rubin/Langston  1410.381   50.0 ACS 2003_06_13_07:20:43
AGBT03B_034_02:    5     9        M81  RALongMap       test  31!  9h55m36  69d35'56   240  Rubin/Langston  1410.383   50.0     2003_06_13_07:30:25
AGBT03B_034_02:   11    55        M81  RALongMap       test  45   7h40m00  67d58'00 12150  Rubin/Langston  1410.391   50.0 ACS 2003_06_13_07:55:18
AGBT03B_034_03:    1     2        M81      OffOn       test   2   9h40m00  66d30'00     6  Rubin/Langston  1410.374   50.0 ACS 2003_06_14_04:18:17
AGBT03B_034_03:    3     4        M81      OffOn       test   2   9h40m00  66d30'00     6  Rubin/Langston  1410.374   50.0 ACS 2003_06_14_04:23:28
AGBT03B_034_03:    5    49        M81  RALongMap       test  45   9h39m55  67d58'01 12150  Rubin/Langston  1410.379   50.0 ACS 2003_06_14_04:30:41
AGBT03B_034_03:   50    87        M81  RALongMap       test  45!  7h40m24  70d30'00 10260  Rubin/Langston  1410.393   50.0 ACS 2003_06_14_08:07:09
AGBT03B_034_04:   31    32        M81      OffOn       test   2   9h40m00  69d30'00     6  Rubin/Langston  1410.385   50.0 ACS 2003_06_15_04:33:04
AGBT03B_034_04:   33    34        M81      OffOn       test   2   9h40m00  69d30'00     6  Rubin/Langston  1410.385   50.0 ACS 2003_06_15_04:37:15
AGBT03B_034_04:   35    79        M81  RALongMap       test  45   9h39m57  70d58'01 12150  Rubin/Langston  1410.390   50.0 ACS 2003_06_15_04:44:51
AGBT03B_034_04:  105   125        M81  RALongMap       test  21   7h40m00  73d10'00  5670  Rubin/Langston  1410.406   50.0 ACS 2003_06_15_10:36:04
AGBT03B_034_04:  126   170        M81  RALongMap       test  45   9h40m00  73d57'59 12150  Rubin/Langston  1410.399   50.0 ACS 2003_06_15_12:17:41
AGBT03B_034_04:  171   215        M81  RALongMap       test  45   9h40m00  70d58'00 12150  Rubin/Langston  1410.391   50.0 ACS 2003_06_15_15:52:59
AGBT03B_034_04:  216   223        M81  RALongMap       test  45!  8h33m55  70d54'00  1920  Rubin/Langston  1410.394   50.0 ACS 2003_06_15_19:29:30
AGBT03B_034_05:    1     2        M81      OffOn       test   2   9h55m52  69d40'47    12  Langston/Rubin  1410.387   50.0 ACS 2003_06_16_07:09:09
AGBT03B_034_05:    3     4        M81      OffOn       test   2   9h55m52  69d40'47    12  Langston/Rubin  1410.387   50.0 ACS 2003_06_16_07:13:02
AGBT03B_034_05:    5     6        M81      OffOn       test   2   9h55m52  69d40'47    12  Langston/Rubin  1410.387   50.0 ACS 2003_06_16_07:16:20
AGBT03B_034_05:    7     8        M81      OffOn       test   2   9h55m52  69d40'47    24  Langston/Rubin  1410.387   50.0 ACS 2003_06_16_07:19:11

-- GlenLangston - 12 Dec 2007

Attachment:	Action:	Size:	Date:	Who:	Comment:
AGBT03B_034_01.txt	action	2105	12 Dec 2007 - 15:42	GlenLangston
AGBT03B_034_02.txt	action	848	12 Dec 2007 - 15:44	GlenLangston
AGBT03B_034_03.txt	action	872	12 Dec 2007 - 15:45	GlenLangston
AGBT03B_034_04.txt	action	1283	12 Dec 2007 - 15:45	GlenLangston
AGBT03B_034_05.txt	action	14137	12 Dec 2007 - 15:46	GlenLangston