Cluster Bulleticity

Article, Preprint English OPEN
Massey, Richard ; Kitching, Thomas ; Nagai, Daisuke (2010)
  • Publisher: WILEY-BLACKWELL
  • Related identifiers: doi: 10.1111/j.1365-2966.2011.18246.x
  • Subject: Elementary particles | theory [Cosmology] | weak [Gravitational lensing] | clusters: general [Galaxies] | Dark matter | galaxies: clusters. [X-rays] | Astrophysics - Cosmology and Nongalactic Astrophysics
    arxiv: Astrophysics::Cosmology and Extragalactic Astrophysics

The unique properties of dark matter are revealed during collisions between clusters of galaxies, such as the bullet cluster (1E 0657−56) and baby bullet (MACS J0025−12). These systems provide evidence for an additional, invisible mass in the separation between the distributions of their total mass, measured via gravitational lensing, and their ordinary ‘baryonic’ matter, measured via its X-ray emission. Unfortunately, the information available from these systems is limited by their rarity. Constraints on the properties of dark matter, such as its interaction cross-section, are therefore restricted by uncertainties in the individual systems' impact velocity, impact parameter and orientation with respect to the line of sight. Here we develop a complementary, statistical measurement in which every piece of substructure falling into every massive cluster is treated as a bullet. We define ‘bulleticity’ as the mean separation between dark matter and ordinary matter, and we measure the signal in hydrodynamical simulations. The phase space of substructure orbits also exhibits symmetries that provide an equivalent control test. Any detection of bulleticity in real data would indicate a difference in the interaction cross-sections of baryonic and dark matter that may rule out hypotheses of non-particulate dark matter that are otherwise able to model individual systems. A subsequent measurement of bulleticity could constrain the dark matter cross-section. Even with conservative estimates, the existing Hubble Space Telescope archive should yield an independent constraint tighter than that from the bullet cluster. This technique is then trivially extendable to and benefits enormously from larger, future surveys.
  • References (12)
    12 references, page 1 of 2

    Bacon D., Goldberg D., Rowe B. & Taylor A., 2006, MNRAS 365, 414

    Bradac M. et al., 2006, ApJ 652, 937 Bradac M. et al., 2008, ApJ 687, 959 Clowe D., Gonzalez A. & Markevitch M., 2004, ApJ 604, 596

    Clowe D., Bradac M., Gonzalez A., Markevitch M., Randall S., Jones C. & Zaritsky D., 2006, ApJL 648, 109 Coe D., Benitez N., Broadhurst T., Moustakas L. & Ford H., ApJ submitted (arXiv:1005.0398) Cortese L. et al., 2007, MNRAS 376, 157 Feng J., 2010, ARA&A 48, 495 Gastaldello F., Buote D., Temi P., Brighenti F., Mathews W. & Ettori S., 2009, ApJ, 693, 43 Goldberg D. & Bacon D., 2005, ApJ 619, 741 Hamana T., Takada M. & Yoshida N., 2004, MNRAS 350 893

    Kravtsov A., 1999, PhD thesis, New Mexico State University

    Kravtsov A., Klypin A. & Ho man Y., 2002, ApJ 571, 563 Klypin A., Kravtsov A., Bullock J. & Primack J., 2001, ApJ 554, 903

    Kubo J., Stebbins A., Annis J., Dell'Antonio I., Lin H., Khiabanian H. & Frieman J., 2007, ApJ 671, 1466 Kubo J. et al., 2009 ApJ 702 L110 Leonard A., Goldberg D., Haaga J. & Massey R., 2007, ApJ 666, 51

    Leonard A., King L. & Goldberg D., MNRAS submitted (arXiv:1009.1018)

    Mahdavi A., Hoekstra H., Babul A., Balam D. & Capak P., 2007, 668, 806

    Marshall P., 2006, MNRAS 372, 1289 Massey R., et al. 2004, AJ 127, 3089 Massey R., Kitching T. & Richard J., 2010, Rep. Prog. Phys. 73, 086901

    Nagai D., Kravtsov A. & Vikhlinin A., 2007a, ApJ 668, 1 Nagai D., Vikhlinin A. & Kravtsov A., 2007b, ApJ 655, 98 Powell L., Kay S. & Babul A., 2009, MNRAS 400, 705 Randall S., Markevitch M., Clowe D., Gonzalez A. & Bradac M., 2008, ApJ 670, 1173 Randall S., Jones C., Markevitch M., Blanton E., Nulsen P. & Forman W., 2009, ApJ 700, 1404 Refregier A. et al., 2009, arXiv:1001.0061 Rhodes J., Refregier A. & Groth E., 2000, ApJ 536, 79 Richard J. et al., 2010, MNRAS 404, 325 Russell H., Sanders J., Fabian A., Baum S., Donahue M., Edge A., McNamara B. & O'Dea C., 2010, MNRAS 406, 1721

  • Similar Research Results (1)
  • Metrics
    No metrics available