Now showing items 1-20 of 25

    • A megacam survey of outer halo satellites. I. description of the survey 

      Muñoz Vidal, Ricardo Rodrigo; Cote, Patrick; Santana, Felipe; Geha, Marla; Simón, Joshua D.; Oyarzún, Grecco A.; Stetson, Peter B.; Djorgovski, S. G. (IOP Publishing, 2018-06-10)
      We describe a deep, systematic imaging study of satellites in the outer halo of the Milky Way. Our sample consists of 58 stellar overdensities-i.e., substructures classified as either globular clusters, classical dwarf ...
    • A megacam survey of outer halo satellites. III. Photometric and structural parameters 

      Muñoz Vidal, Ricardo Rodrigo; Cote, Patrick; Santana, Felipe; Geha, Marla; Simón, Joshua D.; Oyarzún, Grecco A.; Stetson, Peter B.; Djorgovski, S. G. (The American Astronomical Society, 2018-06-10)
      We present structural parameters from a wide-field homogeneous imaging survey of Milky Way satellites carried out with the MegaCam imagers on the 3.6 m Canada-France-Hawaii Telescope and 6.5 m Magellan-Clay telescope. Our ...
    • 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 ...
    • Cusps in the center of galaxies: a real conflict with observations or a numerical artefact of cosmological simulations? 

      Baushev, Anton; Valle Bertoni, Luciano del; Campusano Brown, Luis; Escala Astorquiza, Andrés; Muñoz Vidal, Ricardo; Palma Quilodrán, Gonzalo (IOP Publishing, 2017-05)
      Galaxy observations and N-body cosmological simulations produce conflicting dark matter halo density pro files for galaxy central regions. While simulations suggest a cuspy and universal density pro file (UDP) of this ...
    • Deep Subaru Hyper Suprime-Cam Observations of Milky Way Satellites Columba I and Triangulum II 

      Carlin, Jeffrey L; Sand, David J.; Muñoz Vidal, Ricardo Rodrigo; Spekkens, Kristine; Willman, Beth; Crnojevic, Denija; Forbes, Duncan A.; Hargis, ,Jonathan; Kirby, Evan; Peter, Annika H. G.; Romanowsky, Aaron J.; Strader, Jay (IOP Publishing, 2017)
      We present deep, wide-field Subaru Hyper Suprime-Cam photometry of two recently discovered satellites of the Milky Way (MW): Columba. I (Col I) and Triangulum. II (Tri II). The color-magnitude diagrams of both objects point ...
    • Discovery of distant RR Lyrae Stars in the Milky Way using DECam 

      Medina, Gustavo E.; Muñoz Vidal, Ricardo Rodrigo; Katherina Vivas, A.; Carlin, Jeffrey L.; Forster, Francisco; Martínez, Jorge; Galbany, Lluis; González Gaitán, Santiago; Hamuy Wackenhut, Mario; De Jaeger, Thomas; Maureira, Juan Carlos; San Martín Aristegui, Jaime (IOP Publishing Ltd, 2018)
      We report the discovery of distant RR Lyrae stars, including the most distant known in the Milky Way, using data taken in the g-band with the Dark Energy Camera as part of the High cadence Transient Survey (HiTS; 2014 ...
    • Evidence for substructure in Ursa Minor dwarf spheroidal galaxy using a Bayesian object detection method 

      Pace, Andrew B.; Martínez, Gregory D.; Kaplinghat, Manoj; Muñoz Vidal, Ricardo Rodrigo (Oxford University Press, 2014)
      We present a method for identifying localized secondary populations in stellar velocity data using Bayesian statistical techniques. We apply this method to the dwarf spheroidal galaxy Ursa Minor and find two secondary ...
    • Hydra II: a faint and compact milky way dwarf galaxy found in the survey ofthe magellanic stellar history 

      Martín, Nicolás F.; Nidever, David L.; Besla, Gurtina; Olsen, Knut; Walker, Alistair R.; Vivas, A. Katherina; Gruendl, Robert A.; Kaleida, Catherine C.; Muñoz Vidal, Ricardo Rodrigo; Blum, Robert D.; Saha, Abhijit; Conn, Blair; Bell, Eric; Chu, You-Hua; Cioni, María-Rosa; Boer, Thomas de; Gallart, Carme; Jin, Shoko; Kunder, Andrea; Majewski, Steven; Martínez-Delgado, David; Monachesi, Antonela; Monelli, Matteo; Monteagudo, Lara; Noël, Noelia; Olszewski, Edward; Stringfellow, Guy; Van der Marel, Roeland; Zaritsky, Dennis (The American Astronomical Society, 2015)
      We present the discovery of a new dwarf galaxy, Hydra II, found serendipitously within the data from the ongoing Survey of the Magellanic Stellar History conducted with the Dark Energy Camera on the Blanco 4 m Telescope. ...
    • Insights into the properties of the Local (Orion) spiral arm. NGC 2302: First results and description of the program 

      Costa Hechenleitner, Edgardo; Moitinho, André; Radiszcz Sotomayor, Matías Cristóbal; Muñoz Vidal, Ricardo Rodrigo; Carraro, Giovanni; Vázquez, Rubén A.; Servajean Bergoeing, Elise (EDP Sciences, 2015)
      Context. Infrared dark clouds are the coldest and densest portions of giant molecular clouds. The most massive ones represent some of the most likely birthplaces for the next generation of massive stars in the Milky Way. ...
    • MEASURING SIZES OF ULTRA-FAINT DWARF GALAXIES 

      Muñoz Vidal, Ricardo Rodrigo; Padmanabhan, Nikhil; Geha, Marla (IOP PUBLISHING LTD, 2012-02-01)
      The discovery of ultra-faint dwarf (UFD) galaxies in the halo of the Milky Way extends the faint end of the galaxy luminosity function to a few hundred solar luminosities. This extremely low luminosity regime poses a ...
    • The Quest-La Silla AGN Variability Survey 

      Cartier Ugarte, Regis; Lira Teillery, Paulina; Coppi, Paolo; Sánchez, Paula; Arévalo, Patricia; Bauer, Franz; Rabinowitz, David; Zinn, Robert; Muñoz Vidal, Ricardo; Meza, Nicolás (IOP Pub., 2015)
      We present the characterization and initial results from the QUEST–La Silla active galactic nucleus (AGN) variability survey. This is an effort to obtain well-sampled optical light curves in extragalactic fields with ...
    • Searching for optical counterparts to ultra-compact high velocity clouds:Possible detection of a counterpart to agc 198606 

      Janesh, William; Rhode, Katherine L.; Salzer, John J.; Janowiecki, Steven; Adams, Elizabeth A. K.; Haynes, Martha P.; Giovanelli, Riccardo; Cannon, John M.; Muñoz Vidal, Ricardo Rodrigo (IOS Press, 2015)
      We report initial results from a campaign to obtain optical imaging of Ultra Compact High Velocity Clouds (UCHVCs) discovered by the Arecibo Legacy Fast ALFA (ALFALFA) HI survey. UCHVCs have properties consistent with their ...
    • Serendipitous discovery of RR lyrae stars in the leo v ultra-faint galaxy 

      Medina, Gustavo E.; Muñoz Vidal, Ricardo Rodrigo; Vivas, A. Katherina; Förster, Francisco; Carlin, Jeffrey L.; Martínez, Jorge; Galbany, Lluis; González Gaitán, Santiago; Hamuy Wackenhut, Mario; Jaeger, Thomas De; Maureira, Juan Carlos; San Martín, Jaime (Institute of Physics, 2017)
      During the analysis of RR Lyrae stars (RRLs) discovered in the High Cadence Transient Survey (HiTS) taken with the Dark Energy Camera at the 4 m telescope at Cerro Tololo Inter-American Observatory, we found a group of ...
    • Sloan digital sky survey IV: mapping the milky way, nearby galaxies, and the distant universe 

      Blanton, Michael R.; Bershady, Matthew A.; Abolfathi, Bela; Muñoz Vidal, Ricardo Rodrigo; Santana, Felipe (IOP Publishing Ltd., 2017)
      We describe the Sloan Digital Sky Survey IV (SDSS-IV), a project encompassing three major spectroscopic programs. The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is observing hundreds of thousands ...
    • SMASH 1: A very faint globular cluster disrupting in the outer reaches of the LMC? 

      Martín, Nicolás F.; Jungbluth, Valentín; Nidever, David L.; Bell, Eric F.; Besla, Gurtina; Blum, Robert D.; Cioni, María Rosa L.; Conn, Blair C.; Kaleida, Catherine C.; Gallart, Carme; Jin, Shoko; Majewski, Steven R.; Martínez Delgado, David; Monachesi, Antonela; Muñoz Vidal, Ricardo Rodrigo; Noel, Noelia E. D.; Olsen, Knut; Stringfellow, Guy S.; Van der Marel, Roeland P.; Vivas, A. Katherina; Walker, Alistair R.; Zaritsky, Dennis (IOP Publishing, 2016)
      We present the discovery of a very faint stellar system, SMASH 1, that is potentially a satellite of the Large Magellanic Cloud. Found within the Survey of the MAgellanic Stellar History (SMASH), SMASH 1 is a compact (r(h) ...
    • SMASH: survey of the MAgellanic Stellar history 

      Nidever, David L.; Olsen, Knut; Muñoz Vidal, Ricardo Rodrigo; Santana, Felipe; Medina, Gustavo E. (IOP Publishing Ltd., 2017)
      The Large and Small Magellanic Clouds are unique local laboratories for studying the formation and evolution of small galaxies in exquisite detail. The Survey of the MAgellanic Stellar History (SMASH) is an NOAO community ...
    • Tails and streams around the Galactic globular clusters NGC 1851, NGC 1904, NGC 2298 and NGC 2808 

      Carballo Bello, Julio A.; Martínez Delgado, David; Navarrete, Camila; Catelan, Marcio; Muñoz Vidal, Ricardo Rodrigo; Antoja, Teresa; Sollima, Antonio (Oxford University Press, 2018)
      We present Dark Energy Camera imaging for the peculiar Galactic globular clustersNGC 1851, NGC1904 (M 79), NGC2298 and NGC2808. Our deep photometry reveals that all the clusters have an important contribution of stars ...
    • Target Selection for the SDSS-IV APOGEE-2 Survey 

      Zasowski, G.; Cohen, R. E.; Chojnowski, S. D.; Santana, F.; Muñoz Vidal, Ricardo Rodrigo (IOP Publishing Ltd., 2017)
      APOGEE-2 is a high-resolution, near-infrared spectroscopic survey observing similar to 3. x. 10(5) stars across the entire sky. It is the successor to APOGEE and is part of the Sloan Digital Sky Survey IV (SDSS-IV). APOGEE-2 ...
    • The electromagnetic counterpart of the binary neutron star merger LIGO/Virgo GW170817. I. discovery of the optical counterpart using the dark energy camera 

      Soares Santos, M.; Holz, Holz, D. E.; Annis, J.; Medina, G. E.; Muñoz Vidal, Ricardo Rodrigo (IOP Publishing Ltd., 2017)
      We present the Dark Energy Camera (DECam) discovery of the optical counterpart of the first binary neutron star merger detected through gravitational-wave emission, GW170817. Our observations commenced 10.5 hr post-merger, ...
    • The electromagnetic counterpart of the binary neutron star merger LIGO/Virgo GW170817. II. UV, optical, and near-infrared light curves and comparison to kilonova models 

      Cowperthwaite, P. S.; Berger, E.; Villar, V. A.; Medina, G. E.; Muñoz Vidal, Ricardo Rodrigo (IOP Publishing Ltd., 2017)
      We present UV, optical, and near-infrared (NIR) photometry of the first electromagnetic counterpart to a gravitational wave source from Advanced Laser Interferometer Gravitational-wave Observatory (LIGO)/Virgo, the binary ...