ChaMPlane Observation: CTIO/Hydra May 10-15, 2007

ChaMPlane Observation with CTIO 4m Hydra

May 10-15, 2007

I. Target Fields

Target Fields are from the 19 Mosaic fields taken in 2004 and 2005 at CTIO/4m. Table 1 lists these target fields sortted by RA. (Not all the Hydra setups are ready at this moment.)

            Table 1. ChaMPlane CTIO/Hydra Observation Field List
MID  Mosaic  Field      RA(J2000)    Dec(J2000)      l         b       NH(e22)
------------------------------------------------------------------------------
 60  ctio05  PSR1046    10:48:00.00  -58:28:48.0  287.37619    0.61334   0.684
 61  ctio05  MYCN18     13:39:57.60  -67:20:24.0  307.59271   -4.90835   0.317
 44  ctio04  G309       13:50:12.00  -62:09:36.0  309.73349   -0.06672   7.336
 45  ctio04  PSR1509    15:09:36.00  -58:48:18.0  320.01083   -0.59235   6.358
 46  ctio04  G322       15:24:00.00  -57:06:53.2  322.52438   -0.16385   4.416
 47  ctio04  J1550      15:51:01.07  -56:27:16.6  325.90033   -1.81329   0.944
 62  ctio05  Abell3627  16:13:45.60  -60:48:36.0  325.24203   -7.03382   0.121
 48  ctio04  MZ3        16:17:09.70  -51:59:30.2  331.71680   -1.00867   1.132
 49  ctio04  Mars       17:00:48.53  -26:58:24.2  356.04932    9.28549   0.132
 50  ctio04  J1709      17:09:36.71  -26:36:53.0  357.51978    7.91659   0.341
 51  ctio04  Tornado    17:40:00.00  -30:57:59.2  357.63300   -0.03307  11.271
 63  ctio05  LW         17:51:48.00  -29:34:12.0    0.15160   -1.48171   0.704
 52  ctio04  SW         17:54:24.42  -29:49:16.3    0.22242   -2.09703   0.478
 53  ctio04  U1755      17:58:49.20  -33:51:00.0  357.19409   -4.92093   0.399
 54  ctio04  BW         18:03:36.00  -29:57:50.7    1.08909   -3.89739   0.321
 55  ctio04  G11        18:11:20.40  -19:14:24.0   11.32621   -0.22863   8.865
 64  ctio05  V4641      18:19:21.38  -25:27:00.0    6.73546   -4.80812   0.289
 56  ctio04  PSR1823    18:26:00.00  -13:37:12.0   17.94011   -0.66268   7.538
 65  ctio05  H1905      19:08:36.00  +00:11:24.0   35.06054   -3.73080   0.359
------------------------------------------------------------------------------

Table 2 lists the Hydra setup files. For each field, there are bright setups (R < 20) and faint setups (R => 20). Our data show that hydra is only effective for objects with R < 20. So we only observe bright setups in this run. For most of the fields, only observe the first bright setup. The faint setups are only listed here for reference. Only observe those with more than 20 objects in the hydra file. Priorities are given in the order of number of objects in the setup.

    Table 2. ChaMPlane CTIO/Hydra Observation Hydra files 
           Bright (12 < R < 20)     Faint (R => 20) 	  Very bright (R<12)
Field   Total   1   2   3  4  5  Total   1   2   3  4  5
-----------------------------------------------------------------------------
PSR1046   146  77d 38d 22d 7  1    475 100 100  81 70 47
MYCN18     77  46d 22d  6  2  1    171  71  61  26  9  3
G309      132  77d 40d 12  3  0    225  94  73  36 13  6      8d
PSR1509    53  38d 12   2  1  0    149  85  38  11  4  6
G322      363 107d 102 84 38 14    222  93  77  41 10  1
J1550     499 100d 84d 85d 81d 59 1159 102 103  92 76 80
Abell3627 121  67d 32  13  5  3     87  64  18   3  2  0
MZ3       390  80d 95  71 68 37    971 104  97  94 82 77
J1709      89  54d 24  10  1  0    372  90  86  65 38 27
Tornado    62  52   8   1  1  0     10   9   1   0  0  0
SW        968 106 101  91 99 87     43  39   4  
G11       363  89d 75d 71 55 33    705 102 103 103 107 94    10
PSR1823   268  82d 64  48 33 22    751 104  91  82 74 68
H1905     105  58  33   9  2  1     72  38  23   6  2  1
-------------------------------------------------------------------
Total: Total number of bright or faint objects (without spectra yet) in the field.
1-5:   Number of bright or faint objects in the 1-5 hydra setups
Click a number to get that hydra setup file.
Click a field name to get the detailed information of the hydra setup.
 where: 
  hydra_file:    hydra setup.
  Center_RA,Dec: Center RA and Dec of the hydra setup.
  Sky:           number of sky positions.
  GS GSb GSf:    number of FOPS stars, with their bright and faint R mag.
  Obj Rb Rf:     number of objects, with their bright and faint R mag.
  X XRb XRf:     number of chandra counterparts, with their bright and faint R mag.
  Xha Xhab Xhaf: number of chandra-Ha sources, with their bright and faint R mag.
  Xhm Xhmb Xhmf: number of chandra-Hm sources, with their bright and faint R mag.
  H HRb HRf:     number of Ha emission sources, with their bright and faint R mag.
d: done (observed)

III. Exposure Sequence

Take 3x40min exposures for each bright setup. Table 3 lists the exposure sequence for each setup, including setup fibers, acquire field and take comparison lamp. The total time needed for each bright setup is 2hr40m.

 Table 3. Exposure sequence for bright hydra setup
Do                     Exp  Readout  Total  Timeline
                      (sec)  (min)   (min)    (min)
-----------------------------------------------------
Setup hydra fiber                     ~20     20.0
Acquire field                          ~5     25.0
projector flat         5      2.5       2.5   27.5 
Arc lamp spectrum      3      2.5       2.5   30.0
Object spectra      2400      2.5      42.5   72.5
Object spectra      2400      2.5      42.5  115.0
Object spectra      2400      2.5      42.5  157.5
Arc lamp spectrum     10      2.5       2.5  160.0
-----------------------------------------------------

There are a few setups for very bright stars (R<~12). These stars are removed from the bright setups to prevent saturation and contaminating neighboring spectra. When the weather is bad and no good spectra can be taken for bright setups, take those very bright setups with a single 15min exposure. The total time needed for each very bright setup is 45min (assuming field acquisition has been done for the bright setups).

 Table 4. Exposure sequence for very bright hydra setup
Do                     Exp  Readout  Total  Timeline
                      (sec)  (min)   (min)    (min)
-----------------------------------------------------
Setup hydra fiber                     ~20     20.0
projector flat         5      2.5       2.5   22.5
Arc lamp spectrum      3      2.5       2.5   25.0
Object spectra       900      2.5      17.5   42.5
Arc lamp spectrum     10      2.5       2.5   45.0
-----------------------------------------------------

IV. Observation Plan

Here is an observing elevation chart showing the locus of the 19 target fields. Space between the two vertical dashed lines is the astronomical twilight zone.

postscript and CTIO 2007 May Ephemeris Xavier's Hydra Guide hydra-usermanual

Astronomical twilight:  19:25 - 5:55   duration 10h30m 
Do four bright setups each night:  4 x 160min = 640m = 10h40m - 20m(first hydra setup) = 10h20m

V. Flux Standard

Take flux standards every night. To take the standard, move one fiber to the exact center, then point the telescope at the flux standard and take a spectrum. Remember to take a comparison spectrum after each standard taken.