Zobrazeno 1 - 10
of 37
pro vyhledávání: '"Mager, Violet A."'
Autor:
Hoyt, Taylor J., Freedman, Wendy L., Madore, Barry F., Beaton, Rachael L., Hatt, Dylan, Jang, In Sung, Lee, Myung Gyoon, Monson, Andrew J., Neeley, Jillian R., Rich, Jeffrey A., Mager, Violet A.
We determine the distances to the Type Ia Supernova host galaxies M66 (NGC 3627) and M96 (NGC 3368) of the Leo I Group using the Tip of the Red Giant Branch (TRGB) method. We target the stellar halos of these galaxies using the Hubble Space Telescope
Externí odkaz:
http://arxiv.org/abs/1907.05891
Autor:
Mager, Violet A., Conselice, Christopher J., Seibert, Mark, Gusbar, Courtney, Katona, Anthony P., Villari, Joseph M., Madore, Barry F., Windhorst, Rogier A.
Evolutionary studies that compare galaxy structure as a function of redshift are complicated by the fact that any particular galaxy's appearance depends in part on the rest-frame wavelength of the observation. This leads to the necessity for a "morph
Externí odkaz:
http://arxiv.org/abs/1808.00577
Publikováno v:
2013 ApJ, 777, 79
The impact of metallicity on the Cepheid Period-Luminosity (P-L) relation is investigated using HST ACS V and I images of M101. Variations in the reddening-free Wesenheit parameter (W), which is employed as a proxy for luminosity, are examined as a f
Externí odkaz:
http://arxiv.org/abs/1310.2487
We have extracted PSF-fitted stellar photometry from near-ultraviolet, optical and near-infrared images, obtained with the Hubble Space Telescope, of the nearby (D ~ 5.5 Mpc) SBm galaxy NGC 1311. The ultraviolet and optical data reveal a population o
Externí odkaz:
http://arxiv.org/abs/1007.0784
Autor:
Freedman, Wendy L., Rigby, Jane, Madore, Barry F., Persson, S. E., Sturch, Laura, Mager, Violet
Publikováno v:
Astrophys.J.695:996-998,2009
We present mid-infrared Period-Luminosity relations for Cepheids in the Local Group galaxy IC1613. Using archival IRAC imaging data from Spitzer we were able to measure single-epoch magnitudes for five, 7 to 50-day, Cepheids at 3.6 and 4.5 microns. W
Externí odkaz:
http://arxiv.org/abs/0901.2907
Autor:
Madore, Barry F., Rigby, Jane, Freedman, Wendy L., Persson, S. E., Sturch, Laura, Mager, Violet
Publikováno v:
Astrophys.J.693:936-939,2009
We present the first application of mid-infrared Period-Luminosity relations to the determination of a Cepheid distance beyond the Magellanic Clouds. Using archival IRAC imaging data on NGC 6822 from Spitzer we were able to measure single-epoch magni
Externí odkaz:
http://arxiv.org/abs/0812.0186
Publikováno v:
Astrophys.J.690:389-393,2009
We introduce a modified detection method for measuring the luminosity of the tip of the red giant branch (TRGB) by introducing the composite magnitude T = I - beta [(V-I)_o - 1.50], where beta is the slope of the tip magnitude as a function of color
Externí odkaz:
http://arxiv.org/abs/0809.2598
We have determined the distance to NGC 4258 using observations made with the Hubble Space Telescope (HST) and the Wide Field, Advanced Camera for Surveys (ACS/WFC). We apply a modified technique that fully accounts for metallicity effects on the use
Externí odkaz:
http://arxiv.org/abs/0808.2180
Autor:
Schweizer, Francois, Burns, Christopher R., Madore, Barry F., Mager, Violet A., Phillips, M. M., Freedman, Wendy L., Boldt, Luis, Contreras, Carlos, Folatelli, Gaston, Gonzalez, Sergio, Hamuy, Mario, Krzeminski, Wojtek, Morrell, Nidia I., Persson, S. E., Roth, Miguel R., Stritzinger, Maximilian D.
Publikováno v:
Astron.J. 136:1482-1489 (2008)
Traditionally, the distance to NGC 4038/39 has been derived from the systemic recession velocity, yielding about 20 Mpc for H_0 = 72 km/s/Mpc. Recently, this widely adopted distance has been challenged based on photometry of the presumed tip of the r
Externí odkaz:
http://arxiv.org/abs/0807.3955
Autor:
Eskridge, Paul B., de Grijs, Richard, Anders, Peter, Windhorst, Rogier A., Mager, Violet A., Jansen, Rolf A.
Publikováno v:
Astron.J.135:120-129,2008
Ultraviolet, optical and near infrared images of the nearby (D ~ 5.5 Mpc) SBm galaxy NGC 1311, obtained with the Hubble Space Telescope, reveal a small population of 13 candidate star clusters. We identify candidate star clusters based on a combinati
Externí odkaz:
http://arxiv.org/abs/0710.3614