Modified following suggestions by Peter McCullough
* standardized IR aperture to IR-FIX
* added orient restrictions to keep ACS parallels locked on M81
changed orient ranges to contiguous ranges spanning 0.
----- Attempting Submission 1 (Tue Jul 08 18:27:29 GMT 2008) -----
----- Attempting Submission 2 (Thu Oct 16 13:29:30 GMT 2008) -----
----- Attempting Submission 3 (Thu Oct 16 14:48:43 GMT 2008) -----
Assigned ID: 69
----- Attempting Submission 1 (Wed Mar 05 14:02:50 GMT 2008) -----
Studying Cepheid Systematics in M81: H-band Observations
The local value of the Hubble Constant remains one of the most important constraints in
cosmology, but improving on the 10% accuracy of the HST Key Project is challenging. No
improvements will be convincing until the metallicity dependence is well constrained and
blending effects are fully understood. M81 and its dwarf companion Holmberg IX are superb
laboratories for studying Cepheid systematics because they contain large numbers of
bright Cepheids with a good spread in metallicity lying at a common, relatively close
distance. We have identified 180 12<P< 70 day Cepheids in these two galaxies using the
Large Binocular Telescope (compared to 30 in total by the KP), and will expand the sample
further in 2008-2009. We will use 10 orbits with WFC3/IR to obtain H-band images of 100
Cepheids in M81 to add to the ACS/BVI calibrations we will obtain from archival data and
1 orbit with WFC3/UVIS to add B-band data for Holmberg IX. Four band BVIH photometry will
allow us to flux calibrate, estimate extinction, measure metallicity effects and then check
the results in detail. We can also examine blending effects on WFC3/IR data in a
relatively nearby galaxy before it is applied to more distant galaxies. Our M81 sample
is three times larger than the next best sample, that of NGC4258, and suffers less from
blending because M81 is at half the distance, so it is an excellent laboratory for studying
Cepheid systematics even if it lacks as precise a geometric distance as NGC4258.
These observations are meant to calibrate the H-band magnitudes of roughly 100 Cepheids in M81 and to
supply a B-band magnitude for those in Holmberg IX.
The observations are multiply dithered/CR split in order to maximize control of systematics that may effect
the calibrations (CR hits, hot pixels etc) and to modestly improve the PSF sampling.
COSMOLOGY
12
79000
false
0.0
0.0
false
false
false
false
false
SUPPORTED
EXT-STAR
CEPHEID
Cepheids embedded in large nearby galaxy (M81)
J2000
09 56 19.7090
+69 04 34.47
J2000
EXT-STAR
CEPHEID
Cepheids embedded in large nearby galaxy (M81)
J2000
09 56 8.1920
+68 59 9.19
J2000
EXT-STAR
CEPHEID
Cepheids embedded in large nearby galaxy (M81)
J2000
09 55 36.4270
+69 08 1.26
J2000
EXT-STAR
CEPHEID
Cepheids embedded in large nearby dwarf galaxy (Holmberg IX)
J2000
09 57 34.5150
+69 02 34.93
J2000
EXT-STAR
CEPHEID
Cepheids embedded in large nearby galaxy (M81)
J2000
09 56 20.7200
+69 07 37.66
J2000
EXT-STAR
CEPHEID
Cepheids embedded in large nearby galaxy (M81)
J2000
09 55 13.7400
+69 10 5.10
J2000
EXT-STAR
CEPHEID
Cepheids embedded in large nearby galaxy (M81)
J2000
09 55 34.3510
+69 12 23.47
J2000
EXT-STAR
CEPHEID
Cepheids embedded in large nearby galaxy (M81)
J2000
09 56 16.2890
+69 02 41.39
J2000
EXT-STAR
CEPHEID
Cepheids embedded in large nearby galaxy (M81)
J2000
09 54 45.7730
+69 02 19.00
J2000
EXT-STAR
CEPHEID
Cepheids embedded in large nearby galaxy (M81)
J2000
09 54 57.7700
+69 00 19.34
J2000
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F160W
WFC3/UVIS
Imaging
No
No
F438W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F555W
ACS/WFC
Imaging
No
No
F555W
POS-TARG
DITHER
0.572
LINE
0.365
false
false
74.653
4
18.528
WFC3-IR-DITHER-BOX-MIN
1
false
POS-TARG
DITHER
0.145
LINE
false
false
2
46.84
WFC3-UVIS-DITHER-LINE
3
false
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