<=== observer ===>
"CCESARSK",\
"Cesarsky, Catherine",\
"",\
"Service d'Astrophysique",\
"Bat 709",\
"CE Saclay",\
"91191",\
"Gif/Yvette",\
"FRANCE",\
" 33169088055",\
" 33169086577",\
"cesarsky@33590.span.cnes.fr"
<=== proposal ===>
"DEEPXSRC",1,5,\
{"galaxy clusters"}, \
{"CAM consortium", "Cesarsky, C. J.","Pierre, M.",\
"Mandolesi, N.", "Vigroux, L.", "Bohringer, H.","Hunstead, R.",\
"Mellier, Y.","Elbaz, D."}
<=== title ===>
Deep imaging of a sample of X-ray galaxy clusters in Hydra
<=== abstract ===>
SCIENTIFIC ABSTRACT:
To link the survey of distant clusters to the Virgo sample, we will study
the mid-IR emission of a sample of clusters in the Hydra region. These
clusters have been studied in the X ray range with ROSAT, and in the
optical and radio ranges from ground, by M. Pierre and co-workers. Present
results indicate that the correlation amongst the three wavelengths appear
stronger for the higher redshift members of the sample, indicating a
luminosity selection effect or, possibly, an evolution in cluster
properties with redshift.
OBSERVATION SUMMARY:
We intend to observe these clusters in the ISOCAM filters used in the deep
survey and the distant cluster proposal, LW2 and LW3, and with PHOT C100 at 90
microns.
For clusters at z ~ 0.1, we will use AOT1 in the microscanning mode, with a
PFOV of 6", to cover a field of 10'x10'. The objective is to detect a
galaxy 10 times fainter than the starburst galaxy NGC6240 at z = 0.1 (0.5
mJy at 7 microns and 1 mJy at 14 microns), with a S/N ratio of 4. We intend
to perform raster scans of 8x8 positions, displacing every time the array
by 16 pixels. The axis of the raster will be aligned to the spacecraft
axis. The time required is 2500 seconds per filter, including all
overheads.
Redshifting the same starburst galaxy at z=0.2, intensities will be 0.1 and
0.2 mJy at 7 and 14 microns respectively. At z=0.3 they will be reduced by
a factor of two (i.e. 0.05 and 0.1 mJy). For clusters at z~0.2-0.3, we
shall use the following microscanning mode: 4x4 positions, displacement of
16 pixels. The area most covered will be close to 5'x5'; the total observed
area will be 2.8 times larger. According to the ISOCAM software simulator,
we should obtain with LW2 in 2500 sec a S/N of 3.7 for a 0.1 mJy source;
with LW3 barely >1 for a 0.2 mJy source. With flux densities two times
fainter and same exposure times, the simulations show that the S/N will be
decreased to ~2 for LW2 and 0.6 for LW3. However, for such long exposures,
we think that it will be possible to use more sophisticated data processing
procedures than that provided by the simulator and improve the present
predictions. An alternative would be to restrain our observations to a
3'x3' field and use the beam switching mode (CAM03). Then, taking the
last-mentioned observing figures the simulator predicts a S/N of 3 for LW2
and 1.2 for LW3.
All clusters will be observed with PHOT in the camera mode using the
chopper with a beam throw of 180". We shall use C100, with the 90 micron
filter. We shall perform rasters of 6x6 positions for z = 0.1, of 3x3 for z
= 0.2, and 2x2 for z =0.3 displacing the array by steps of 1.5' in both
directions. Thus, we will cover a field of 10.5'x10.5', 6'x6', 4.5'x4.5'
with individual integration times will of 2 min, 3 min, 5 min respectively.
Our aim is to be able to observe sources of a few mJy with a S/N greater
than 3. At the mJy level - or earlier - we expect to reach the confusion
level, but what we want to measure is the integrated light of the cluster.
<=== scientific_justification ===>
The "Hydra" numbers given in the targets list are the "sequence"
numbers given in Pierre et al 1994 A&A, in press.
Corresponding ROSAT identification numbers, Abell numbers and redshifts are
given in table below.
Hydra
= ROSAT ID Abell z
sequence
1 RXJ1013.6-1350 0.1517
3 RXJ1023.8-2715 A3444 0.2542
4 RXJ1027.9-0648 A1023 0.1176
5 RXJ1031.6-2607 0.2472
9 RXJ1044.5-0704 A1084 0.1346
10 RXJ1046.8-2535 0.2426
12 RXJ1050.5-0236 A1111 0.1651
14 RXJ1103.6-2329 0.1867
17 RXJ1130.3-1434 A1285 0.1068
18 RXJ1131.9-1955 A1300 0.3058
20 RXJ1141.4-1216 0.1195
22 RXJ1149.7-1218 A1391 0.1534
32 RXJ1303.7-2414 A3541 0.1288
33 RXJ1315.0-4236 0.1048
34 RXJ1325.1-2013 A1732 0.1926
#Time distribution for autumn or spring launch targets
# TEAM top 40% second 30% last 30%
# CAM: 36000 34200 34200
<=== autumn_launch_targets ===>
1, "CAM01", 1.0, "N", "Hydra 5 ", 10.5271, -26.1236,2000,0.,0.,7500,2
2, "PHT22", 1.0, "N", "Hydra 5 ", 10.5271, -26.1236,2000,0.,0.,1200,0
3, "CAM01", 1.0, "N", "Hydra 34 ", 13.4184, -20.2306,2000,0.,0.,7000,4
4, "PHT22", 1.0, "N", "Hydra 34 ", 13.4184, -20.2306,2000,0.,0.,1600,0
5, "CAM01", 1.0, "N", "Hydra 33 ", 13.2510, -42.6156,2000,0.,0.,5000,6
6, "PHT22", 1.0, "N", "Hydra 33 ", 13.2510, -42.6156,2000,0.,0.,4000,0
7, "CAM01", 1.0, "N", "Hydra 18 ", 11.5321, -19.9272,2000,0.,0.,8500,8
8, "PHT22", 1.0, "N", "Hydra 18 ", 11.5321, -19.9272,2000,0.,0.,1200,0
9, "CAM01", 2.0, "N", "Hydra 12 ", 10.8430, -2.60417,2000,0.,0.,3200,10
10,"PHT22", 2.0, "N", "Hydra 12 ", 10.8430, -2.60417,2000,0.,0.,2500,0
11,"CAM01", 2.0, "N", "Hydra 9 ", 10.7423, -7.06861,2000,0.,0.,6500,12
12,"PHT22", 2.0, "N", "Hydra 9 ", 10.7423, -7.06861,2000,0.,0.,4500,0
13,"CAM01", 2.0, "N", "Hydra 10 ", 10.7811, -25.5986,2000,0.,0.,7500,14
14,"PHT22", 2.0, "N", "Hydra 10 ", 10.7811, -25.5986,2000,0.,0.,1200,0
15,"CAM01", 2.0, "N", "Hydra 3 ", 10.3973, -27.2575,2000,0.,0.,7600,16
16,"PHT22", 2.0, "N", "Hydra 3 ", 10.3973, -27.2575,2000,0.,0.,1200,0
17,"CAM01", 3.0, "N", "Hydra 22 ", 11.8298, -12.3103,2000,0.,0.,7400,18
18,"PHT22", 3.0, "N", "Hydra 22 ", 11.8298, -12.3103,2000,0.,0.,2500,0
19,"CAM01", 3.0, "N", "Hydra 32 ", 13.0622, -24.2497,2000,0.,0.,7000,20
20,"PHT22", 3.0, "N", "Hydra 32 ", 13.0622, -24.2497,2000,0.,0.,4500,0
21,"CAM01", 3.0, "N", "Hydra 12 ", 10.8430, -2.60417,2000,0.,0.,4000,0
22,"CAM01", 3.0, "N", "Hydra 14 ", 11.0604, -23.4928,2000,0.,0.,7000,23
23,"PHT22", 3.0, "N", "Hydra 14 ", 11.0604, -23.4928,2000,0.,0.,1800,0
<=== spring_launch_targets ===>
1, "CAM01", 1.0, "N", "Hydra 12 ", 10.8430, -2.60417,2000,0.,0.,7300,0
2, "CAM01", 1.0, "N", "Hydra 9 ", 10.7423, -7.06861,2000,0.,0.,6500,3
3, "PHT22", 1.0, "N", "Hydra 9 ", 10.7423, -7.06861,2000,0.,0.,3800,0
4, "CAM01", 1.0, "N", "Hydra 5 ", 10.5271, -26.1236,2000,0.,0.,7500,5
5, "PHT22", 1.0, "N", "Hydra 5 ", 10.5271, -26.1236,2000,0.,0.,1200,0
6, "CAM01", 1.0, "N", "Hydra 18 ", 11.5321, -19.9272,2000,0.,0.,8500,7
7, "PHT22", 1.0, "N", "Hydra 18 ", 11.5321, -19.9272,2000,0.,0.,1200,0
8, "PHT22", 2.0, "N", "Hydra 12 ", 10.8430, -2.60417,2000,0.,0.,2000,0
9, "CAM01", 2.0, "N", "Hydra 17 ", 11.5051, -14.5733,2000,0.,0.,4700,0
10,"CAM01", 2.0, "N", "Hydra 10 ", 10.7811, -25.5986,2000,0.,0.,7500,11
11,"PHT22", 2.0, "N", "Hydra 10 ", 10.7811, -25.5986,2000,0.,0.,1700,0
12,"CAM01", 2.0, "N", "Hydra 3 ", 10.3973, -27.2575,2000,0.,0.,7600,13
13,"PHT22", 2.0, "N", "Hydra 3 ", 10.3973, -27.2575,2000,0.,0.,1200,0
14,"CAM01", 2.0, "N", "Hydra 14 ", 11.0604, -23.4928,2000,0.,0.,7000,15
15,"PHT22", 2.0, "N", "Hydra 14 ", 11.0604, -23.4928,2000,0.,0.,2500,0
16,"PHT22", 3.0, "N", "Hydra 17 ", 11.5051, -14.5733,2000,0.,0.,4200,0
17,"CAM01", 3.0, "N", "Hydra 4 ", 10.4664, -6.80333,2000,0.,0.,4900,18
18,"PHT22", 3.0, "N", "Hydra 4 ", 10.4664, -6.80333,2000,0.,0.,3900,0
19,"CAM01", 3.0, "N", "Hydra 1 ", 10.2271, -13.8472,2000,0.,0.,7000,20
20,"PHT22", 3.0, "N", "Hydra 1 ", 10.2271, -13.8472,2000,0.,0.,3900,0
21,"CAM01", 3.0, "N", "Hydra 20 ", 11.6900, -12.2772,2000,0.,0.,6400,22
22,"PHT22", 3.0, "N", "Hydra 20 ", 11.6900, -12.2772,2000,0.,0.,3900,0