The Carnegie Hubble Program: The Infrared Leavitt Law in IC 1613
Abstract
We have observed the dwarf galaxy IC 1613, at multiple epochs in the mid-infrared using Spitzer and contemporaneously in the near-infrared using the new FourStar near-infrared camera on Magellan. We have constructed Cepheid period–luminosity relations in the J, H, K_s, [3.6] and [4.5] bands and have used the run of their apparent distance moduli as a function of wavelength to derive the line-of-sight reddening and distance to IC 1613. Using a nine-band fit, we find E(B − V) = 0.05 ± 0.01 mag and an extinction-corrected distance modulus of μ_0 = 24.29 ± 0.03_(statistical) ± 0.03_(systematic) mag. By comparing our multi-band and [3.6] distance moduli to results from the tip of the red giant branch and red clump distance indicators, we find that metallicity has no measurable effect on Cepheid distances at 3.6 μm in the metallicity range −1.0 ≤ [Fe/H] ≤ 0.2, hence derivations of the Hubble constant at this wavelength require no correction for metallicity.
Additional Information
© 2013 American Astronomical Society. Received 2013 January 23; accepted 2013 June 21; published 2013 July 31. We thank the referee for their thoughtful response, which improved the content and style of the paper. This research made use of the NASA/IPAC Extragalactic database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research made use of APLpy, an open-source plotting package for Python hosted at http://aplpy.github.com Facilities: Spitzer, Magellan:BaadeAttached Files
Published - 0004-637X_773_2_106.pdf
Submitted - 1306.5802v1.pdf
Files
Name | Size | Download all |
---|---|---|
md5:3813724a76c9b35a9c4f6a098b4fd346
|
1.2 MB | Preview Download |
md5:77b249c40961cb281b720f8422e164e7
|
1.2 MB | Preview Download |
Additional details
- Eprint ID
- 41455
- Resolver ID
- CaltechAUTHORS:20130920-150412615
- NASA/JPL/Caltech
- Created
-
2013-09-20Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)