NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
The Carnegie Hubble Program: The Infrared Leavitt Law in IC 1613We have observed the dwarf galaxy IC 1613 at multiple epochs in the midinfrared using Spitzer and the in the near-infrared using the new FourStar near-IR camera on Magellan. We have constructed Cepheid period luminosity relations in the J, H, Ks, [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 nineband fit, we find E(BV ) = 0.050.01 mag and an extinction corrected distance modulus of 0 = 24.29 0.03statistical 0.03systematic mag. By comparing our multiband 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 m in the metallicity range 1.0 [Fe/H] 0.2, hence derivations of the Hubble constant at this wavelength require no correction for metallicity.
Document ID
20130011787
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Scowcroft, Victoria (Carnegie Institution for Science Pasadena, CA, United States)
Freedman, Wendy L. (Carnegie Institution for Science Pasadena, CA, United States)
Madore, Barry F. (Carnegie Institution for Science Pasadena, CA, United States)
Monson, Andrew J. (Carnegie Institution for Science Pasadena, CA, United States)
Persson, S. E. (Carnegie Institution for Science Pasadena, CA, United States)
Seibert, Mark (Carnegie Institution for Science Pasadena, CA, United States)
Rigby, Jane R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Melbourne, Jason (California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 27, 2013
Publication Date
January 1, 2013
Subject Category
Astronomy
Report/Patent Number
GSFC-E-DAA-TN7778
Distribution Limits
Public
Copyright
Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available