Refereed Publications

  1. Hubble Space Telescope Observations of Tadpole Galaxies Kiso3867, SBS0, SBS1, and UM461
    Elmegreen, Debra Meloy; Elmegreen, Bruce G; Gallagher, John S.; Kotulla, Ralf; Sánchez Almeida, Jorge; Muñoz-Tuñón, Casiana; Caon, Nicola; Rafelski, Marc; Sunnquist, Ben; Revalski, Mitchell; Andersen, Morten
    The Astrophysical Journal, Volume 941, Issue 2, id.157arXiv:2211.09292 
  2. NGC 3314a/b and NGC 3312 : Ram Pressure Stripping in Hydra I cluster substructure
    Kelley M Hess, Ralf Kotulla, Hao Chen, Claude Carignan, Jay S Gallagher, T. Jarrett, R. Kraan-Korteweg
    Astronomy & Astrophysics, Volume 668, id.A184arXiv:2209.05605 
  3. Ionization and Star Formation in the Giant HII Region SMC-N66
    Emily Geist, Jay S Gallagher, Ralf Kotulla, L. Oskinova, W.-R. Hamann, V. Ramachandran, E. Sabbi, L. Smith, A. Kniazev, A. Nota
    Publications of the Astronomical Society of the Pacific, Volume 134, Issue 1036, id.064301arXiv:2205.05147
  4. Bars and central Star Formation in Nearby Spiral Galaxies
    Yangyang Liu, Jay S. Gallagher, Emily Geist, Ralf Kotulla
    submitted to Research in Astronomy and Astrophysics
  5. A Catalog of Galaxies in the Direction of the Perseus Cluster
    Carolin Wittmann, Ralf Kotulla, Thorsten Lisker, Eva K Grebel, Christopher J Conselice, Joachim Janz, Samantha J. Penny
    Astrophysical Journal Supplement, 245, 1, 10arXiv:1911.00951
  6. Episodically Active Asteroid 6478 Gault
    David Jewitt, Yoonyoung Kim, Jane Luu, Jayadev Rajagopal, Ralf Kotulla, Susan Ridgway, Wilson Liu
    Astrophysical Journal Letters, 876, 2, L19arXiv:1904.07100
  7. Active Asteroid P/2017 S5 (ATLAS)
    David Jewitt, Yoonyoung Kim, Jayadev Rajagopal, Susan Ridgway, Ralf Kotulla, Wilson Liu, Max Mutchler, Jing Li, Harold Weaver, Stephen Larson
    Astrophysical Journal, 157, 2, 54arXiv:1812.00060
  8. Supersoft X-Ray sources identified with Be binaries in the Magellanic Clouds
    Valentina Cracco, et al., incl. Ralf Kotulla
    Astrophysical Journal 862, 167 (2018)arXiv:1806.08971
  9. Interstellar Interloper 1I/2017 U1: Observations from the NOT and WIYN Telescopes
    David Jewitt, Jane Luu, Jayadev Rajagopal, Ralf Kotulla, Susan Ridgway, Wilson Liu, Thomas Augusteijn
    Astrophysical Journal Letters, 850, 36 (2017)arXiv:1711.05687
    in the news: UW-Madison News – NOAO News
  10. A population of faint low surface brightness galaxies in the Perseus cluster core
    Carolin Wittmann, et al, incl. Ralf Kotulla
    MNRAS 470, 1512 (2017)arXiv:1705.09697
  11. Optical identification of a steady supersoft X-ray source in M 31
    Marina Orio, G. J. M. Luna, Ralf Kotulla, et al.
    MNRAS 470, 2212 (2017)arXiv:1705.10875
  12. Timing of Five PALFA-Discovered Millisecond Pulsars
    Kevin Stovall et al, incl. Ralf Kotulla
    Astrophysical Journal, volume 833, 192 (2016) – arXiv:1608.08880
  13. NGC 5523 – An isolated Product of Soft Galaxy Mergers?
    Leah M. Fulmer, John S. Gallagher III, Ralf Kotulla
    Astronomy & Astrophysics (Research Note), Volume 598, article A119 (2017)arXiv:1611.05968
  14. GalevNB: a conversion from N-BODY simulations to observations
    Xiaoying Pang, Christoph Olczak, Difeng Guo, Rainer Spurzem, Ralf Kotulla
    Research in Astronomy and Astrophysics, Volume 16, Issue 3, article id. 001 (2016)arXiv:1509.05864
  15. On the occurrence of galaxy harassment
    Daniel Bialas, Thorsten Lisker, Christoph Olczak, Rainer Spurzem, Ralf Kotulla
    Astronomy & Astrophysics, Volume 576, A103 (2015)arXiv:1503:01965
  16. Filamentary Star Formation in NGC 1275
    Rebecca Canning, Jenna Ryon, John Gallagher, Ralf Kotulla + 8 co-authors
    MNRAS 444, 336 (2014) – arXiv:1406:4800C
  17. Stochastic Stellar Cluster IMFs: Models and Impact on Integrated Cluster Parameter Determination
    Peter Anders, Ralf Kotulla, Richard de Grijs, James Wicker
    ApJ, 778, 138 (2013) – arXiv:1310:4936
  18. Discovery of the Optical/Ultraviolet/Gamma-ray Counterpart to the Eclipsing Millisecond Pulsar J1816+4510
    David Kaplan, et al, incl. Ralf Kotulla
    ApJ 753, 174 (2012) – arXiv:1205.3699
  19. Evidence for environmentally dependent cluster disruption in M83
    Nate Bastian, et al, incl. Ralf Kotulla
    MNRAS Letters 417, 6 (2011) – arXiv:1106.2427
  20. PHAT: Photo-z Accuracy Testing
    Hendrik Hildebrandt, et al, incl. Ralf Kotulla
    A&A 523, 31 (2010) – arXiv:1008.0658
  21. The first generation of Virgo cluster dwarf elliptical galaxies?
    Thorsten Lisker, Joachim Janz, Gerhard Hensler, Suk Kim, Soo-Chang Rey, Chiara Mastroprieto, Oliver Hielscher, Simone Weinmann, Sanjaya Paudel, Ralf Kotulla
    ApJ Letters, 706, 124 (2009) – arXiv:0910.3209
  22. The role of E+A and post-starburst galaxies – II. Spectral Energy Distributions and comparison with observations
    Marie A. Falkenberg, Ralf Kotulla & Uta Fritze
    MNRAS 397, 1954 (2009) – arXiv:0905.0909
  23. The role of E+A and post-starburst galaxies – I. Models and model results
    Marie A. Falkenberg, Ralf Kotulla & Uta Fritze
    MNRAS 397, 1940 (2009) – arXiv:0901.1665
  24. GALEV evolutionary synthesis models – I. Code, input physics and web-interface
    Ralf Kotulla, Uta Fritze, Peter Weilbacher & Peter Anders
    MNRAS 396, 462 (2009) – arXiv:0903.0378
  25. Impact of sub-solar metallicities on photometric redshifts
    Ralf Kotulla & Uta Fritze
    MNRAS Letters 393, 55 (2009) – arXiv:0811.3217
  26. Rescuing the Initial Mass Function for Arp78
    Ralf Kotulla, Uta Fritze & John S. Gallagher III
    ApJ Letters 688, 65 (2008) – arXiv:0810.1748
  27. New active galactic nuclei detected in ROSAT All Sky Survey galaxies
    II. The complete dataset
    W. Kollatschny, Ralf Kotulla, W. Pietsch, K. Bischoff
    A&A 484, 897 – 915 (2008) – arXiv:0804.1917
  28. Young Globular Clusters in an old S0: Clues to the Formation History of NGC 4570
    Ralf Kotulla, Uta Fritze, Peter Anders
    MNRAS 387, 1149 (2008) – arXiv:0804.1257

SPIE papers

  1. The WIYN one degree imager in 2018: an extended 30-detector focal plane
    Harbeck, Daniel R.; Lesser, Mike; Liu, Wilson; Stupak, Bob; George, Ron; Harris, Ron; Poczulp, Gary; Rajagopal, Jayadev; Kotulla, Ralf; Ouellete, David; Hooper, Eric J.; Smith, Michael; Mason, Dustin; Onaka, Peter; Chin, Greg; Hunting, Emily; Christensen, Robert
    Proceedings of the SPIE, Volume 10702, id. 1070229 11 pp. (2018)
  2. The WIYN one degree imager 2014: performance of the partially populated focal plane and instrument upgrade path
    Daniel Harbeck, Todd Boroson, Michael Lesser, Jayadev Rajagopal, Andrey Yeatts, Charles Corson, Wilson Liu, Ian Dell’Antonio, Ralf Kotulla, David Ouellete, Eric Hooper,  Mike Smith, Richard Bredthauer, Pierre Martin, Gary Muller, Patricia Knezek, Mark Hunten
    Proceedings of SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91470P (July 8, 2014); doi:10.1117/12.2056651
  3. ODI – Portal, Pipeline, and Archive (ODI-PPA): a web based astronomical compute archive, visualization, and analysis service
    Arvind Gopu, Soichi Hayashi, Michael D. Young, Daniel R. Harbeck, Todd Boroson, Wilson Liu, Ralf Kotulla, Richard Shaw, Robert Henschel, Jayadev Rajagopal, Patricia Knezek, R. Pierre Martin, Kevin Archbold
    Proceedings of SPIE 9152, Software and Cyberinfrastructure for Astronomy III, 91520E (July 18, 2014); doi:10.1117/12.2057123
  4. Integrating the ODI-PPA scientific gateway with the QuickReduce pipeline for on-demand processing
    Michael D. Young, Ralf Kotulla, Arvind Gopu, Wilson Liu
    Proceedings of SPIE 9152, Software and Cyberinfrastructure for Astronomy III, 91522U (July 18, 2014); doi:10.1117/12.2056763

Astronomy Telegrams, research updates

  1. NIR Imaging of the Transitional Pulsar Binary J1023+0038
    Z. Wang, A. Tziamtzis, D. L. Kaplan, R. Kotulla, M. Orio, A. K.H. Kong, P. H.T. Tam, X. Wang
    The Astronomers Telegram, #6103
  2. GRB 111103B : WIYN 3.5m NIR observations
    Ralf Kotulla, Atish Kamble, David Kaplan, Nial Tanvir
    The Gamma-Ray Coordinates Network Circular, #12531
  3. Confirmation of near-infrared counterpart of IGR J17407-2808/CXOU J174042.0-280724
    Ramanpreet Kaur, C. Heinke, Ralf Kotulla, Arthur Eigenbrot, Andrew Schechtman-Rook, David Kaplan
    The Astronomers Telegram, #3695
  4. Candidate near-infrared counterpart to the faint transient neutron star X-ray binary SAX J1806.5-2215
    Ramanpreet Kaur, Ralf Kotulla, N. Degenaar, R. Wijnands, David Kaplan
    The Astronomers Telegram, #3268

AAS Contributions

  1. Imaging exoplanets with the WFIRST Coronagraph: A background check of high priority targets
    Fu, Guangwei; Turnbull, Margaret C.; Gallagher, John S.; Kotulla, Ralf C.; Merrelli, Aronne; L’Ecuyer, Tristan; Hu, Renyu
    AAS 2016 – view abstract
  2. Detecting Mass Loss in Main Belt Asteroids
    Sandberg, Erik; Rajagopal, Jayadev; Ridgway, Susan E.; Kotulla, Ralf C.; Valdes, Francisco; Allen, Lori
    AAS 2016 – view abstract
  3. WFIRST Exoplanet Imaging: Can Broadband Colors Efficiently Descriminate Planets from the Background?
    Turnbull, Margaret C.; Kotulla, Ralf C.; Gallagher, John S.; Merrelli, Aronne; L’Ecuyer, Tristan; Fu, Guangwei; Hu, Renyu
    AAS 2016 – view abstract

Conference Proceedings

  1. Rapid Large Scale Reprocessing of the ODI archive using the QuickReduce Pipeline
    Arvind Gopu, Ralf Kotulla, Michael D. Young, Soichi Hayashi, Daniel Harbeck, Wilson Liu, Robert Henschel
    in “ADASS XXIV” – view on ADS
  2. User Driven Image Stacking for ODI data and beyond via a Highly Customizable Web Interface
    Soichi Hayashi, Arvind Gopu, Michael D. Young, Ralf Kotulla
    in: “ADASS XXIV”- view on ADS
  3. Operational Support for Instrument Stability through ODI-PPA Metadata Visualization and Analysis
    Michael D. Young, Soichi Hayashi, Arvind Gopu, Ralf Kotulla, Daniel Harbeck, Wilson Liu
    in: “ADASS XXIV”- view on ADS
  4. The QuickReduce pipeline for the WIYN One Degree Imager
    Author: Ralf Kotulla
    in “ADASS XXIII”, San Franciso, CA, 2013, eds. N. Manset & P. Forshay
    download proceeding – ArXiV 1310:5046
  5. GALEV evolutionary synthesis models on the web – current status and future plans
    Authors: Ralf Kotulla, Peter Anders, Peter Weilbacher & Uta Fritze
    in “Proceedings of IAU Symposium No. 262: Stellar Populations – Planning for the next decade”
    eds. G. Bruzual & S. Charlot
    IAU Proceedings 262, 366
  6. A new investigation of the luminosity-metallicity relation for star-forming dwarf galaxies
    Authors: Hagen T. Meyer, Ralf Kotulla, Polychronis Papderos, Yuri Izotov, Klaus J. Fricke
    in “Star-forming Dwarf Galaxies: Ariadne’s Thread in the Cosmic Labyrinth”, Crete, 2008, eds P. Papaderos, N. Bergvall, T. Marquart and G. Östlin
    ADS – astro-ph
  7. Detecting metal-rich intermediate-age Globular Clusters in NGC 4570 using K-band photometry
    Authors: Ralf Kotulla, Uta Fritze, Peter Anders
    in “Young Massive Star Clusters”, eds. E. Perez, R. de Grijs, R. Gonzalez Delgado
    Ap&SS 324, 347 (2009) – arXiv:0801.2318

Conference Posters

  1. Granada 2007 & AG Meeting 2007
    Using globular clusters to derive the formation history of the Virgo Lenticular NGC 4570 – Preliminary Results
    Ralf Kotulla, Uta Fritze, Peter Anders & Richard de Grijs
  2. JENAM 2008:
    Impact of sub-solar metallicities and evolutionary corrections on photometric redshifts (pdf)
    Ralf Kotulla & Uta Fritze
  3. JENAM 2008:
    GALEV evolutionary synthesis models on the web (pdf)
    Ralf Kotulla, Uta Fritze, Peter Weilbacher & Peter Anders
  4. JENAM 2008:
    Impact of stochastic attenuation on photometric redshifts
    Thorsten Tepper Garcia, Ralf Kotulla, Akio Inoue & Ikuru Iwata
  5. JENAM 2008:
    Revisiting the luminosity-metallicity relation for star-forming dwarf galaxies
    Hagen Thilo Meyer, Ralf Kotulla, Polychronis Papaderos & Yuri Izotov
  6. European Weak of Astronomy and Space Sciences (EWASS/NAM/JENAM) 2009:
    Photometric redshifts from chemically consistent templates (pdf)
    Ralf Kotulla
  7. European Weak of Astronomy and Space Sciences (EWASS/NAM/JENAM) 2009:
    GALEV evolutionary synthesis models: The ideal tool to model high-redshift galaxies (pdf)
    Ralf Kotulla, Uta Fritze, Peter Weilbacher & Peter Anders
  8. European Weak of Astronomy and Space Sciences (EWASS/NAM/JENAM) 2009:
    Modelling galaxy transformation scenarios at z~0.4 with GALEV (pdf)
    Ralf Kotulla, Marie-Aylin Falkenberg & Uta Fritze
  9. European Weak of Astronomy and Space Sciences (EWASS/NAM/JENAM) 2009:
    Arp 78 and the Universality of the Stellar Initial Mass Functions (pdf)
    Ralf Kotulla, John S. Gallagher III & Uta Fritze
  10. VIIth Marseille International Cosmology Conference (Marseille, France; 2009):
    Harvesting the desert: The Universe between redshift 1 and 3
    A unified approach to modelling galaxies not only in the redshift desert (pdf)
    Ralf Kotulla
  11. IAU Symposium 284: The Spectral Energy Distributions of Galaxies (Preston, UK; September 2011):
    GALEV and photometric redshifts: Galaxy evolution across cosmic times (pdf)
    Ralf Kotulla
  12. Surveys and Simulations: The Real and the Virtual Universe (Heidelberg; September 2011)
    2011 Annual Meeting of the Astronomische Gesellschaft:
    Splitner-Meeting: Does the Redshift-Zero Universe look as predicted by models?
    Galaxy clusters transforming dwarfs: Insights from stellar mass maps (pdf)
    Ralf Kotulla, Hagen T. Meyer
  13. Surveys and Simulations: The Real and the Virtual Universe (Heidelberg; September 2011)
    2011 Annual Meeting of the Astronomische Gesellschaft:
    GALEV evolutionary synthesis models: Current status and future plans (pdf)
    Ralf Kotulla, Peter Anders