The morphological decomposition of Abell 868

S. P. Driver, S. C. Odewahn, L. Echevarria, S. H. Cohen, Rogier Windhorst, S. Phillipps, W. J. Couch

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We report on the morphological luminosity functions (LFs) and radial profiles derived for the galaxy population within the rich cluster Abell 868 (z = 0.153) based purely on Hubble Space Telescope imaging in F606W. We recover Schechter functions (-24.0 < M F606W - 5 log h 0.65 < -16.0) within a 0.65h 0.65 Mpc radius for early (E/S0), mid (Sabc), and late (Sd/Irr) type galaxies of 1. M all* - 5 log h 0.65 = -22.4 -0.6 +0.6, α all = -1.27 -0.2 +0.2; 2. M E/S0* - 5 log h 0.65 = -21.6 -0.6 +0.6, α E/S0 = -0.5 -0.3 +0.2; 3. M Sabc* - 5 log h 0.65 = -21.3 -0.9 +1.0, α Sabc = -1.2 -0.2 +0.2; and 4. M Sd/Irr* - 5 log h 0.65 = -17.4 -0.7 +0.7, α Sd/Irr = -1.4 0.5 +0.6. The early, mid, and late types are all consistent with the recent field morphological LFs based on recent analysis of the Sloan Digital Sky Survey Early Data Release. From a detailed error analysis, including clustering of the background population, we note that improved statistics can only come from combining data from many clusters. We also examine the luminosity-density and number-density profiles as a function of morphology and draw the following conclusions: (1) the galaxies responsible for the steep faint-end slope are predominantly of late-type morphology; (2) the cluster core is dominated by elliptical galaxies; (3) the core is devoid of late-type systems; (4) the luminosity density as a function of morphological type is skewed toward early types when compared with the field; (5) up to half of the elliptical galaxies may have formed from the spiral population through core disk-destruction process(es). We believe the most plausible explanation is the conventional one that late types are destroyed during transit through the cluster core and that mid types are converted into early types through a similar process, which destroys the outer disk and results in a more tightly bound population of core elliptical galaxies.

Original languageEnglish (US)
Pages (from-to)2662-2676
Number of pages15
JournalAstronomical Journal
Volume126
Issue number6 1776
StatePublished - Dec 2003

Fingerprint

decomposition
elliptical galaxies
luminosity
galaxies
error analysis
transit
profiles
Hubble Space Telescope
destruction
statistics
slopes
radii
analysis

Keywords

  • Galaxies: clusters: general
  • Galaxies: dwarf
  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: fundamental parameters
  • Galaxies: luminosity function, mass function

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Driver, S. P., Odewahn, S. C., Echevarria, L., Cohen, S. H., Windhorst, R., Phillipps, S., & Couch, W. J. (2003). The morphological decomposition of Abell 868. Astronomical Journal, 126(6 1776), 2662-2676.

The morphological decomposition of Abell 868. / Driver, S. P.; Odewahn, S. C.; Echevarria, L.; Cohen, S. H.; Windhorst, Rogier; Phillipps, S.; Couch, W. J.

In: Astronomical Journal, Vol. 126, No. 6 1776, 12.2003, p. 2662-2676.

Research output: Contribution to journalArticle

Driver, SP, Odewahn, SC, Echevarria, L, Cohen, SH, Windhorst, R, Phillipps, S & Couch, WJ 2003, 'The morphological decomposition of Abell 868', Astronomical Journal, vol. 126, no. 6 1776, pp. 2662-2676.
Driver SP, Odewahn SC, Echevarria L, Cohen SH, Windhorst R, Phillipps S et al. The morphological decomposition of Abell 868. Astronomical Journal. 2003 Dec;126(6 1776):2662-2676.
Driver, S. P. ; Odewahn, S. C. ; Echevarria, L. ; Cohen, S. H. ; Windhorst, Rogier ; Phillipps, S. ; Couch, W. J. / The morphological decomposition of Abell 868. In: Astronomical Journal. 2003 ; Vol. 126, No. 6 1776. pp. 2662-2676.
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AU - Driver, S. P.

AU - Odewahn, S. C.

AU - Echevarria, L.

AU - Cohen, S. H.

AU - Windhorst, Rogier

AU - Phillipps, S.

AU - Couch, W. J.

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N2 - We report on the morphological luminosity functions (LFs) and radial profiles derived for the galaxy population within the rich cluster Abell 868 (z = 0.153) based purely on Hubble Space Telescope imaging in F606W. We recover Schechter functions (-24.0 < M F606W - 5 log h 0.65 < -16.0) within a 0.65h 0.65 Mpc radius for early (E/S0), mid (Sabc), and late (Sd/Irr) type galaxies of 1. M all* - 5 log h 0.65 = -22.4 -0.6 +0.6, α all = -1.27 -0.2 +0.2; 2. M E/S0* - 5 log h 0.65 = -21.6 -0.6 +0.6, α E/S0 = -0.5 -0.3 +0.2; 3. M Sabc* - 5 log h 0.65 = -21.3 -0.9 +1.0, α Sabc = -1.2 -0.2 +0.2; and 4. M Sd/Irr* - 5 log h 0.65 = -17.4 -0.7 +0.7, α Sd/Irr = -1.4 0.5 +0.6. The early, mid, and late types are all consistent with the recent field morphological LFs based on recent analysis of the Sloan Digital Sky Survey Early Data Release. From a detailed error analysis, including clustering of the background population, we note that improved statistics can only come from combining data from many clusters. We also examine the luminosity-density and number-density profiles as a function of morphology and draw the following conclusions: (1) the galaxies responsible for the steep faint-end slope are predominantly of late-type morphology; (2) the cluster core is dominated by elliptical galaxies; (3) the core is devoid of late-type systems; (4) the luminosity density as a function of morphological type is skewed toward early types when compared with the field; (5) up to half of the elliptical galaxies may have formed from the spiral population through core disk-destruction process(es). We believe the most plausible explanation is the conventional one that late types are destroyed during transit through the cluster core and that mid types are converted into early types through a similar process, which destroys the outer disk and results in a more tightly bound population of core elliptical galaxies.

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KW - Galaxies: fundamental parameters

KW - Galaxies: luminosity function, mass function

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