----- Submission 1 (Wed May 04 11:20:36 GMT 2005) -----
Assigned ID: 170
----- Submission 1 (Fri Jan 21 11:11:20 GMT 2005) -----
The Fine Structure of Elliptical Galaxies in Voids
Elliptical galaxies constitute a remarkably homogeneous class of objects with a tight color-magnitude relation and a well-defined Fundamental Plane. In spite of their bland and symmetrical morphology, they are characterized by a wealth of structural features (such as nuclear disks, dust lanes, shells, blue cores, etc.) which contain important clues to their formation history. Little is known about how and if these sub-structures vary as a function of environment; in fact, due to the morphology density relation, our knowledge of ellipticals is strongly biased towards overdense regions such as clusters. But what of the fine structure of ellipticals in voids? According to theoretical predictions, void galaxies should have different merger histories than those in clusters, which may imply that their fine structure also differs. We address these issues using the exquisite angular resolution of HST/ACS to resolve sub-structures in the most accurately classified sample, to date, of truly isolated ellipticals, identified using the 2dFGRS.
The observations aim to describe the isophotal structure of elliptical galaxies in voids. They consist of ACS/WFC imaging in the F555W and F814W filters. Previous experience with HST imaging of nearby ellipticals (Program IDs: 6107, 6357, 8667) has shown that power-law and core galaxies reach a surface brightness of 14.5 and 16.4 mag/arcsec2 respectively, at a distance of 1" from their centre, in the V band. Reaching a S/N > 50 at this radius resulted in a S/N ~ 20 in the isophote at the half-ligh radius and ensured an accurate measurement of the galaxies structure. Since our sample ellipticals are at z ~ 0.1, a radius of 1" corresponds already to about the half-light radius of the targets. The above S/N requirements translate into an exposure time of 500 s in the F555W filter and 400 s in the F814W band for each target (assuming CRSPLIT=4 and GAIN=2).
GALAXIES
12
false
0.0
false
false
false
false
false
SUPPORTED
GALAXY
ELLIPTICAL
J2000
01 05 27.4900
-32 44 45.50
J2000
GALAXY
ELLIPTICAL
J2000
22 14 1.5800
-33 08 6.40
J2000
GALAXY
ELLIPTICAL
J2000
00 48 27.9400
-31 39 42.00
J2000
GALAXY
ELLIPTICAL
J2000
01 08 13.0800
-29 51 7.00
J2000
GALAXY
ELLIPTICAL
J2000
01 39 45.0600
-29 26 8.20
J2000
GALAXY
ELLIPTICAL
J2000
02 29 38.2900
-30 05 24.40
J2000
GALAXY
ELLIPTICAL
J2000
02 51 31.0200
-31 48 57.10
J2000
GALAXY
ELLIPTICAL
J2000
03 05 1.5400
-29 43 39.00
J2000
GALAXY
ELLIPTICAL
J2000
22 18 8.3300
-29 21 51.40
J2000
GALAXY
ELLIPTICAL
J2000
23 21 29.8500
-31 25 58.40
J2000
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F814W
/home/pasquali/OP-cache/hst10630_phase2-v01.xml
(Tic-Visit
:proposal-id 10630
:visit-id "01"
:proposal-version -1
:trans-version "20050323"
:date "28-Apr-2005 14:01:29.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 562000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 10630
:visit-id "01"
:obset-id "01"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 10630
:visit-id "01"
:orbit-number 1
:pcs-time 367
:si-vis-utilization 2909
:al-overhead-at-end 0
:internal-dur-at-end 346
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3283
:pcs-gap 0
)
true
1
0
/tmp/OPVisit7211.xml
/home/pasquali/OP-cache/hst10630_phase2-v02.xml
(Tic-Visit
:proposal-id 10630
:visit-id "02"
:proposal-version -1
:trans-version "20050323"
:date "28-Apr-2005 13:59:14.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 562000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 10630
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 10630
:visit-id "02"
:orbit-number 1
:pcs-time 367
:si-vis-utilization 2895
:al-overhead-at-end 0
:internal-dur-at-end 115
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3267
:pcs-gap 0
)
true
1
0
/tmp/OPVisit7199.xml
/home/pasquali/OP-cache/hst10630_phase2-v03.xml
(Tic-Visit
:proposal-id 10630
:visit-id "03"
:proposal-version -1
:trans-version "20050323"
:date "28-Apr-2005 13:59:54.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 562000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 10630
:visit-id "03"
:obset-id "03"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 10630
:visit-id "03"
:orbit-number 1
:pcs-time 367
:si-vis-utilization 2895
:al-overhead-at-end 0
:internal-dur-at-end 115
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3267
:pcs-gap 0
)
true
1
0
/tmp/OPVisit7200.xml
/home/pasquali/OP-cache/hst10630_phase2-v04.xml
(Tic-Visit
:proposal-id 10630
:visit-id "04"
:proposal-version -1
:trans-version "20050323"
:date "28-Apr-2005 14:00:03.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 562000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 10630
:visit-id "04"
:obset-id "04"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 10630
:visit-id "04"
:orbit-number 1
:pcs-time 367
:si-vis-utilization 2895
:al-overhead-at-end 0
:internal-dur-at-end 115
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3267
:pcs-gap 0
)
true
1
0
/tmp/OPVisit7201.xml
/home/pasquali/OP-cache/hst10630_phase2-v05.xml
(Tic-Visit
:proposal-id 10630
:visit-id "05"
:proposal-version -1
:trans-version "20050323"
:date "28-Apr-2005 14:00:13.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 562000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 10630
:visit-id "05"
:obset-id "05"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 10630
:visit-id "05"
:orbit-number 1
:pcs-time 367
:si-vis-utilization 2911
:al-overhead-at-end 0
:internal-dur-at-end 115
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3283
:pcs-gap 0
)
true
1
0
/tmp/OPVisit7202.xml
/home/pasquali/OP-cache/hst10630_phase2-v06.xml
(Tic-Visit
:proposal-id 10630
:visit-id "06"
:proposal-version -1
:trans-version "20050323"
:date "28-Apr-2005 14:00:24.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 562000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 10630
:visit-id "06"
:obset-id "06"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 10630
:visit-id "06"
:orbit-number 1
:pcs-time 367
:si-vis-utilization 2895
:al-overhead-at-end 0
:internal-dur-at-end 115
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3267
:pcs-gap 0
)
true
1
0
/tmp/OPVisit7203.xml
/home/pasquali/OP-cache/hst10630_phase2-v07.xml
(Tic-Visit
:proposal-id 10630
:visit-id "07"
:proposal-version -1
:trans-version "20050323"
:date "28-Apr-2005 14:00:36.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 562000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 10630
:visit-id "07"
:obset-id "07"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 10630
:visit-id "07"
:orbit-number 1
:pcs-time 367
:si-vis-utilization 2895
:al-overhead-at-end 0
:internal-dur-at-end 115
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3267
:pcs-gap 0
)
true
1
0
/tmp/OPVisit7204.xml
/home/pasquali/OP-cache/hst10630_phase2-v08.xml
(Tic-Visit
:proposal-id 10630
:visit-id "08"
:proposal-version -1
:trans-version "20050323"
:date "28-Apr-2005 14:00:53.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 562000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 10630
:visit-id "08"
:obset-id "08"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 10630
:visit-id "08"
:orbit-number 1
:pcs-time 367
:si-vis-utilization 2911
:al-overhead-at-end 0
:internal-dur-at-end 115
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3283
:pcs-gap 0
)
true
1
0
/tmp/OPVisit7206.xml
/home/pasquali/OP-cache/hst10630_phase2-v09.xml
(Tic-Visit
:proposal-id 10630
:visit-id "09"
:proposal-version -1
:trans-version "20050323"
:date "28-Apr-2005 14:01:08.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 562000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 10630
:visit-id "09"
:obset-id "09"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 10630
:visit-id "09"
:orbit-number 1
:pcs-time 367
:si-vis-utilization 2911
:al-overhead-at-end 0
:internal-dur-at-end 115
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3283
:pcs-gap 0
)
true
1
0
/tmp/OPVisit7208.xml
/home/pasquali/OP-cache/hst10630_phase2-v10.xml
(Tic-Visit
:proposal-id 10630
:visit-id "10"
:proposal-version -1
:trans-version "20050323"
:date "28-Apr-2005 14:01:23.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 562000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 10630
:visit-id "10"
:obset-id "10"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 10630
:visit-id "10"
:orbit-number 1
:pcs-time 367
:si-vis-utilization 2911
:al-overhead-at-end 0
:internal-dur-at-end 115
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3283
:pcs-gap 0
)
true
1
0
/tmp/OPVisit7210.xml