The merger history of massive spheroids since z similar to 1 is size-independent

L. A. Diaz-Garcia, E. Marmol-Queralto, I. Trujillo, A. J. Cenarro, C. Lopez-Sanjuan, P. G. Perez-Gonzalez, G. Barro

Research output: Contribution to journalArticlepeer-review

Abstract

Using a compilation of 379 massive (stellar mass M greater than or similar to 10(11) M-circle dot) spheroid-like galaxies from the near-infrared Palomar/DEEP-2 survey, we investigated, up to z similar to 1, whether the presence of companions depends on the size of the host galaxy. We explored the presence of companions for mass ratios with respect to the central massive galaxy down to 1 : 10 and 1 : 100, and within projected distances of 30, 50 and 100 kpc of these objects. We found evidence that these companions are equally distributed around both compact and extended massive spheroid-like galaxies. This suggests that, at least since z similar to 1, the merger activity in these objects is nearly homogeneous across the whole population and that the merger history is not affected by the size of the host galaxy. Our results could indicate that compact and extended massive spheroid-like galaxies are increasing in size at the same rate.

Original languageEnglish
Pages (from-to)60-68
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume433
Issue number1
DOIs
Publication statusPublished - Jul 2013

Keywords

  • galaxies: evolution
  • galaxies: formation
  • galaxies: high-redshift
  • EARLY-TYPE GALAXIES
  • STAR-FORMATION RATES
  • GOODS NICMOS SURVEY
  • DIGITAL SKY SURVEY
  • ELLIPTIC GALAXIES
  • SPITZER/IRAC SOURCES
  • VELOCITY-DISPERSION
  • QUIESCENT GALAXIES
  • LUMINOSITY-SIZE
  • MINOR MERGERS

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