Now showing items 1-4 of 4

    • A Megacam Survey of Outer Halo Satellites. VI. The Spatially resolved Starformation History of the Carina Dwarf Spheroidal Galaxy* 

      Santana Rojas, Felipe; Muñoz Vidal, Ricardo; de Boer, T. J. L.; Simon, Joshua D.; Geha, Marla; Coté, Patrick; Guzmán Fernández, Andrés; Stetson, Peter B.; Djorgovski, S. George (IOP, 2016)
      We present the spatially resolved star-formation history (SFH) of the Carina dwarf spheroidal galaxy, obtained from deep, wide-field g and r imaging and a metallicity distribution from the literature. Our photometry covers ...
    • Linking type Ia supernova progenitors and their resulting explosions 

      Foley, Ryan J.; Simon, Joshua D.; Burns, Christopher R.; Gal Yam, Avishay; Hamuy Wackenhut, Mario; Kirshner, Robert P.; Morrell, Nidia I.; Phillips, Mark M.; Shields, Gregory A.; Sternberg, Assaf (2012-06-20)
      Comparing the ejecta velocities at maximum brightness and narrow circumstellar/interstellar Na D absorption line profiles of a sample of 23 Type Ia supernovae (SNe Ia), we determine that the properties of SN Ia progenitor ...
    • On the Source of the Dust Extinction in Type Ia Supernovae and the Discovery of Anomalously Strong Na I Absorption 

      Phillips, M. M.; Simon, Joshua D.; Morrell, Nidia; Burns, Christopher R.; Cox, Nick; Foley, Ryan J.; Karakas, Amanda; Patat, F.; Sternberg, A.; Williams, R.; Gal Yam, Avishay; Hsiao, Eric; Leonard, D.; Persson, Sven; Stritzinger, Maximilian; Thompson, I.; Campillay, Abdo; Contreras, Carlos; Folatelli, Gastón; Freedman, Wendy L.; Hamuy Wackenhut, Mario; Roth, Miguel; Shields, Gregory; Suntzeff, Nicholas B.; Chomiuk, Laura; Ivans, Inese; Madore, Barry; Penprase, B.; Perley, Daniel; Pignata Libralato, Giuliano; Preston, G.; Soderberg, Alicia (The American Astronomical Society, 2013-11-10)
      High-dispersion observations of the Na i D λλ5890, 5896 and K i λλ7665, 7699 interstellar lines, and the diffuse interstellar band at 5780 Å in the spectra of 32 Type Ia supernovae are used as an independent means of ...
    • THE SPITZER SPECTROSCOPIC SURVEY OF THE SMALL MAGELLANIC CLOUD ((SMC)-M-4): PROBING THE PHYSICAL STATE OF POLYCYCLIC AROMATIC HYDROCARBONS IN A LOW-METALLICITY ENVIRONMENT 

      Sandstrom, Karin M.; Bolatto, Alberto; Bot, Caroline; Draine, B. T.; Ingalls, James G.; Israel, Frank P.; Jackson, James M.; Leroy, Adam K.; Li, Aigen; Rubio López, Mónica; Simon, Joshua D.; Smith, J. D. T.; Stanimirovic, Snezana; Tielens, A. G. G. M.; Loon, Jacco Th. van (IOP PUBLISHING LTD, 2012-01-01)
      We present results of mid-infrared spectroscopic mapping observations of six star-forming regions in the Small Magellanic Cloud (SMC) from the Spitzer Spectroscopic Survey of the SMC ((SMC)-M-4). We detect the mid-IR ...