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Major merging : the way to make a massive, passive galaxy

(2009) ASTROPHYSICAL JOURNAL LETTERS. 706(1). p.L120-L123
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Abstract
We analyze the projected axial ratio distribution, p(b/a), of galaxies that were spectroscopically selected from the Sloan Digital Sky Survey (DR6) to have low star formation rates. For these quiescent galaxies we find a rather abrupt change in p(b/a) at a stellar mass of similar to 10(11) M-circle dot: at higher masses there are hardly any galaxies with b/a < 0.6, implying that essentially none of them have disk-like intrinsic shapes and must be spheroidal. This transition mass is similar to 3-4 times higher than the threshold mass above which quiescent galaxies dominate in number over star-forming galaxies, which suggests that these mass scales are unrelated. At masses lower than similar to 10(11) M-circle dot, quiescent galaxies show a large range in axial ratios, implying a mix of bulge- and disk-dominated galaxies. Our result strongly suggests that major merging is the most important, and perhaps only relevant, evolutionary channel to produce massive (> 10(11) M-circle dot), quiescent galaxies, as it inevitably results in spheroids.
Keywords
COLOR-MAGNITUDE RELATION, LUMINOUS RED GALAXIES, DIGITAL SKY SURVEY, SIMILAR-TO 1, ELLIPTIC GALAXIES, STAR-FORMATION, STELLAR MASS, DRY, MERGERS, EVOLUTION, DEPENDENCE, galaxies: elliptical and lenticular, cD, galaxies: formation, galaxies: fundamental parameters, galaxies: statistics, galaxies: structure

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Chicago
van der Wel, Arjen, Hans-Walter Rix, Bradford P Holden, Eric F Bell, and Aday R Robaina. 2009. “Major Merging : the Way to Make a Massive, Passive Galaxy.” Astrophysical Journal Letters 706 (1): L120–L123.
APA
van der Wel, A., Rix, H.-W., Holden, B. P., Bell, E. F., & Robaina, A. R. (2009). Major merging : the way to make a massive, passive galaxy. ASTROPHYSICAL JOURNAL LETTERS, 706(1), L120–L123.
Vancouver
1.
van der Wel A, Rix H-W, Holden BP, Bell EF, Robaina AR. Major merging : the way to make a massive, passive galaxy. ASTROPHYSICAL JOURNAL LETTERS. 2009;706(1):L120–L123.
MLA
van der Wel, Arjen, Hans-Walter Rix, Bradford P Holden, et al. “Major Merging : the Way to Make a Massive, Passive Galaxy.” ASTROPHYSICAL JOURNAL LETTERS 706.1 (2009): L120–L123. Print.
@article{8575445,
  abstract     = {We analyze the projected axial ratio distribution, p(b/a), of galaxies that were spectroscopically selected from the Sloan Digital Sky Survey (DR6) to have low star formation rates. For these quiescent galaxies we find a rather abrupt change in p(b/a) at a stellar mass of similar to 10(11) M-circle dot: at higher masses there are hardly any galaxies with b/a < 0.6, implying that essentially none of them have disk-like intrinsic shapes and must be spheroidal. This transition mass is similar to 3-4 times higher than the threshold mass above which quiescent galaxies dominate in number over star-forming galaxies, which suggests that these mass scales are unrelated. At masses lower than similar to 10(11) M-circle dot, quiescent galaxies show a large range in axial ratios, implying a mix of bulge- and disk-dominated galaxies. Our result strongly suggests that major merging is the most important, and perhaps only relevant, evolutionary channel to produce massive (> 10(11) M-circle dot), quiescent galaxies, as it inevitably results in spheroids.},
  author       = {van der Wel, Arjen and Rix, Hans-Walter and Holden, Bradford P and Bell, Eric F and Robaina, Aday R},
  issn         = {2041-8205},
  journal      = {ASTROPHYSICAL JOURNAL LETTERS},
  keywords     = {COLOR-MAGNITUDE RELATION,LUMINOUS RED GALAXIES,DIGITAL SKY SURVEY,SIMILAR-TO 1,ELLIPTIC GALAXIES,STAR-FORMATION,STELLAR MASS,DRY,MERGERS,EVOLUTION,DEPENDENCE,galaxies: elliptical and lenticular,cD,galaxies: formation,galaxies: fundamental parameters,galaxies: statistics,galaxies: structure},
  language     = {eng},
  number       = {1},
  pages        = {L120--L123},
  title        = {Major merging : the way to make a massive, passive galaxy},
  url          = {http://dx.doi.org/10.1088/0004-637X/706/1/L120},
  volume       = {706},
  year         = {2009},
}

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