Matthew Hosek Jr.

Postdoc, University of California at Los Angeles

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• Searching for a Hypervelocity White Dwarf Companion: A Proper Motion Survey of SN 1006
  Shields, J.S., Kerzendorf, W., Hosek Jr., M.W., Shen, K.J., Rest, A., Do, T., Lu, J.R., Fullard, A.G., Strampelli, G., & Zenteno, A. 2022, ApJL, accepted


• An Isolated Mass Gap Black Hole or Neutron Star Detected With Astrometric Microlensing
  Lam, C., Lu, J.R., Udalski, A., Bond, I., Bennett, D.P., Skowron, J., Mroz, P., Poleski, R., Sumi, T., Szymanski, M.K., Kozlowski, S., Pietrukowicz, P., Soszynski, I., Ulaczyk, K., Wyrzykowski, L., Miyazaki, S., Suzuki, D., Koshimoto, N., Rattenbury, N.J., Hosek Jr., M.W., Abe, F., Barry, R., Bhattacharya, A., Fukui, A., Fujii, H., Hirao, Y., Itow, Y., Kirikawa, R., Kondo, I., Matsubara, Y., Matsumoto, S., Muraki, Y., Olmschenk, G., Ranc, C., Okamura, A., Satoh, Y., Ishitani Silva, S., Toda, T., Tristram, P.J., Vandorou, A., Yama, H., Abrams, N.S., Agarwal, S., Rose, S., & Terry, S.K., 2022, ApJL, accepted


• Analyzing long-term performance of the Keck-II adaptive optics system
  Ramey, E., Lu, J.R., Yin, R., Robinson, S., Wizinowich, P., Ragland, S., Lyke, J., Jia, S., Sakai, S., Gautam, A., Do, T., Hosek Jr., M.W., Ghez, A., Morris, M., Becklin, E., & Matthews, K., 2022, JATIS, 8(2) 028004


• The Former Companion of the Hyper-velocity Star S5-HVS1
  Lu, W., Fuller, J., Raveh, Y., Perets, H.B., Li, T.S., Hosek Jr., M.W., & Do, T., 2021, MNRAS, 503, 603


• SPISEA: A Python-Based Simple Stellar Population Synthesis Code for Star Clusters
  Hosek Jr., M.W., Lu, J.R., Lam, C.Y., Gautam, A.K., Lockhart, K.E., Kim, D., & Jia, S., 2020, AJ, 160, 143


• PopSyCLE: A New Stellar Population Synthesis Code for Compact Object Microlensing Events
  Lam, C.Y., Lu, J.R., Hosek Jr., M.W., Dawson, W.A., & Golovich, N.R., 2020, ApJ, 889, 31


• The Unusual Initial Mass Function of the Arches Cluster
  Hosek Jr., M.W., Lu, J.R., Anderson, J., Najarro, F., Ghez, A.M, Morris, M.R., Clarkson, W.I., & Albers, S.M., 2019, ApJ, 870, 44


• The Quintuplet Cluster: Extended Structure and Tidal Radius
  Rui, N.Z., Hosek Jr., M.W., Lu, J.R., Clarkson, W.I., Andersen, J., Morris, M.R., & Ghez, A.M., 2019, ApJ, 877, 1


• Unprecedented Variability of SgrA* in NIR
  Do, T., Witzel, G., Guatam, A.K., Chen, Z., Ghez, A.M., Morris, M.R., Becklin, E.E., Ciurlo, A., Hosek Jr., M.W., Martinez, G.D., Matthews, K., Sakai, S., & Schoedel, R., 2019, ApJL, 882, 27


• Consistency of the Infrared Variability of SgrA* Over 22 Years
  Chen, Z., Gallego-Cano, E., Do, T., Ghez, A.M., Schoedel, R., Sitarski, B.N., Becklin, E.E., Lu, J.R., Morris, M.R., Dehghanfar, A., Guatam, A.K., Hees, A., Hosek Jr., M.W., Jia, S., & Matthews, K., 2019, ApJL, 882, 28


• An Adaptive Optics Survey of Stellar Variability at the Galactic Center
  Guatam, A.K., Do, T., Ghez, A.M., Morris, M.R., Martinez, G.D., Hosek Jr., M.W., Lu, J.R., Sakai, S., Witzel, G., Jia, S., Becklin, E.E., & Matthews, K., 2019, ApJ, 871, 103


• The Galactic Center: Improved Relative Astrometry for Velocities, Accelerations, and Orbits near the Supermassive Black Hole
  Jia, S., Lu, J.R., Sakai, S., Gautam, A.K., Do, T., Hosek Jr., M.W., Service, M., Ghez, A.M., Gallego-Cano, E., Schodel, R., Hees, A., Morris, M.R., Becklin, E.E., & Matthews, K., 2019, ApJ, 873, 9


• The Galactic Center: An Improved Absolute Astrometric Reference Frame for Stellar Orbits around the Supermassive Black Hole
  Sakai, S., Lu, J.R., Ghez, A.M., Jia, S., Do, T., Witzel, G., Guatam, A.K., Hees, A., Morris, M.R., Becklin, E.E., Matthews, K., & Hosek Jr., M.W., 2019, ApJ, 873, 65


• The Optical/Near-Infrared Extinction Law in Highly Reddened Regions
  Hosek Jr., M.W., Lu, J.R., Anderson, J., Do, T., Schlafly, E.F., Ghez, A.M, Clarkson, W.I., Morris, M.R., & Albers, S.M., 2018, ApJ, 855, 13


• The Arches Cluster: Extended Structure and Tidal Radius
  Hosek Jr., M.W., Lu, J.R., Anderson, J., Ghez, A.M., Morris, M.R., & Clarkson, W.I., 2015, ApJ, 813, 27


• Stellar Metallicity of the Extended Disk and Distance of the Spiral Galaxy NGC 3621
  Kudritzki, R.P., Urbaneja, M.A., Bresolin, F., Hosek Jr., M.W., & Przybilla, N., 2014, ApJ, 788, 56


• Quantitative Spectroscopy of Blue Supergiants in Metal-Poor Local Group Galaxy NGC 3109
  Hosek Jr., M.W., Kudritzki, R.P., Bresolin, F., Urbaneja, M.A., Evans, C.J., Pietrński, G., Gieren, W., & Przybilla, N., 2014, ApJ, 785, 151


• A Direct Stellar Metallicity Determination in the Disk of Maser Galaxy NGC 4258
  Kudritzki, R.P., Urbaneja, M.A., Gazak, Z., Macri, L., Hosek Jr., M.W. , Bresolin, F., & Przybilla, N., 2013, ApJL, 779, 20


• Outburst Dust Production of Comet 29P/Schwassmann-Wachmann 1
  Hosek Jr., M.W., Blaauw, R.C., Cooke, W.J., & Suggs, R.M., 2013, AJ, 145, 122


• Lightcurve Analysis of Asteroids 664 Judith and (20453) 1999 KL6
  Hosek Jr., M.W., Cooke, W.J., & Suggs, R.M., 2011, The Minor Planet Builletin, 38, 1, 11

• Analyzing long-term performance of the Keck-II adaptive optics system
  Ramey, E., Lu, J.R., Yin, R., Robinson, S., Wizinowich, P., Ragland, S., Lyke, J., Jia, S., Sakai, S., Gautam, A., Do, T., Hosek Jr., M.W., Ghez, A., Morris, M., Becklin, E., Matthews, K., 2020, Proceedings of SPIE, 11448


• Star Formation in Different Environments: The Initial Mass Function
  Hosek Jr., M.W., Lu, J.R., Andersen, M., Do, T., Kim, D., Rui, N.Z., Boyle, P., Williams, B.F., Chakrabarti, S., & Beaton, R.L., 2019, Astro2020 White Paper, BAAS, 51, 439


• Envisioning the Next Decade of Galactic Center Science: A Laboratory for the Study of Physics and Astrophysics of Supermassive Black Holes
  Do, T., Ghez, A.M., Lu, J.R., Morris, M.R., Hosek Jr., M.W., Hees, A., Noaz, S., Ciurlo, A., Armitage, P.J., Beaton, R.L., Becklin, E.E., Bellini, A., Bentley, R.O., Bland-Hawthorn, J., Chakrabarti, S., Chen, Z., Chu, D.S., Dehghanfar, A., Gammie, C., Guatam, A.K., Genzel, R., Greene, J., Haggard, D., Hora, J., Kerzendorf, W.E., Libralato, M., Nishiyama, S., Kosmo O'Neil, K., Ozel, F., Perets, H., Psaltis, D., Quataert, E., Ramirez-Ruiz, E., Rich, R.M., Rasio, F., Sakai, S., Schoedel, R., Smith, H., Weinberg, & N.N., Witzel, G., 2019, Astro2020 White Paper, BAAS, 51, 530


• Local Dwarf Galaxy Archaeology
  Ji, A.P., Beaton, R.L., Chakrabarti, S., Duggan, G., Frebel, A., Geha, M., Hosek Jr., M.W. , Kirby, E., Li, T., Roederer, I., & Simon, J., 2019, Astro2020 White Paper, arXiv:1903.09275


• The Local Relics of Supermassive Black Hole Seeds
  Greene, J.E., Barth, A., Bellini, A., Bellovary, J., Holley-Bockelmann, K., Do, T., Gallo, E., Gebhardt, K., Gultekin, K., Haiman, Z., Hosek Jr., M.W., Kim, D., Libralato, M., Lu, J.R., Nyland, K., Malkan, M., Reines, A., Seth, A., Treu, T., Walsh, J., & Wrobel, J., 2019, Astro2020 White paper, arXiv:1903.08670


• Near-Infrared Astrometry of Star Clusters with Different Flavors of Adaptive Optics and HST
  Lu, J.R., Neichel, B., Anderson, J., Sinukoff, E., Hosek Jr., M.W., Ghez, A.M., & Rigaut, F., 2014, Proceedings of SPIE, 9148

• Measuring the Orbits of the Arches and Quintuplet Clusters: Exploring Scenariors for Star Formation Near the Galactic Center (Talk)
  UC Berkeley Astro Lunch Talk, April 2022


• The Arches and Quintuplet Clusters: Probes of Star Formation in the Extreme Environment Near the Galactic Center (Talk)
  Chalmers Astrophysics Colloquium (virtual), April 2022


• The Arches and Quintuplet Clusters: Evidence of an Unusual Initial Mass Function Near the Galactic Center? (Talk)
  CMZoom Virtual Talk Series, January 2021


• SPISEA: A New Tool for Simulating Stellar Populations and Associated Case Study: Predictions for Compact Remnants at the Galactic Center (Poster)
  Keck Science Meeting (virtual), September 2020


• PopStar: A New Code for Simulating Star Clusters (Poster)
  Keck Science Meeting, UCLA, Los Anges, CA, September 2019


• Young Massive Clusters Near the Galactic Center: The Initial Mass Function (Talk)
  MorrisFest, UCLA, Los Angeles, CA, September 2019


• Young Massive Clusters at the Galactic Center: Top-Heavy IMF and the Increased Population of Stellar Remnants (Poster)
  2019 Spring Symposium: The Death and Afterlives of Stars, Space Telescope Science Institute, Baltimore, MD, April 2019


• The Arches and Quintuplet Clusters: Evidence of an Unusual Initial Mass Function Near the Galactic Center? (Department Lunch Talk)
  UCLA, Los Angeles, CA, February 2019


• The Initial Mass Function of the Arches and Quintuplet Clusters: Testing the Impact of the Galactic Center Environment (contributed talk)
  Stars: Birth and Death, GMT Community Science Meeting, Honolulu, Hi, September 2018


• The Initial Mass Function of the Arches and Quintuplet Clusters (Visiting Talk)
  UCLA, Los Angeles, Ca, July 2018


• The Initial Mass Function of the Arches Clusters (Talk)
  UC Berkeley Graduate Student-Postdoc Hour, Berkeley, Ca, April 2018


• The Initial Mass Function of the Arches Cluster (contributed dissertation talk)
  231st Meeting of the AAS, Washington, D.C., January 2018


• The Optical/Near-Infrared Extinction Law in Highly Reddened Regions (contributed talk)
  Piercing the Galactic Darkness, Heidelberg, Germany, October 2017


• The Initial Mass Function of the Arches Cluster (contributed talk)
  Keck Science Conference, Santa Cruz, Ca, September 2017


• Toward a Precise Measurement of Initial Mass Function of the Arches Cluster (contributed talk)
  UC Berkeley Astronomy Lunch Talk, Berkeley, Ca, March 2017


• The Dynamics, Structure, and Initial Mass Function of the Arches Cluster (contributed talk)
  Keck Science Conference, Pasadena, Ca, September 2016


• The Dynamical Structure and Initial Mass Function of the Arches Cluster (contributed talk)
  Dynamics and Accretion at the Galactic Center, Aspen Center for Physics, Aspen, Co, February 2016


• The Initial Mass Function of the Outer Arches Cluster (poster)
  IAU XXIX General Assembly, Honolulu, Hi, August 2015


• The Arches Cluster: Extended Profile and Tidal Radius (poster)
  IAU XXIX General Assembly, Honolulu, Hi, August 2015


• The Tidal Radius of the Arches Cluster (poster)
  From Galactic to Extragalactic Star Formation, Marseille, France, September 2014


• An FGLR Distance to Metal-Poor Dwarf Galaxy NGC 3109 (contributed talk)
  The Extragalactic Distance Scale Workshop, Munich Institute for Astro- and Particle Physics, Munich, Germany, June 2014