Wide-field multiband photometry of globular cluster systems in the fornax galaxy cluster

Hak Sub Kim, Suk Jin Yoon, Sangmo Tony Sohn, Sang Chul Kim, Eunhyeuk Kim, Chul Chung, Sang Yoon Lee, Young Wook Lee

Research output: Contribution to journalArticle

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Abstract

We present wide-field multiband photometry of globular cluster (GC) systems in NGC 1399, NGC 1404, and NGC 1387 located in the central region of the Fornax galaxy cluster. Observation was carried out through U, B, V, and I bands, which marks one of the widest and deepest U-band studies on extragalactic GC systems. The present U-band photometry enables us to significantly reduce the contamination by a factor of two for faint sources (V 0 23.5). The main results based on some 2000 GC candidates around NGC 1399, NGC 1404, and NGC 1387 are as follows: (1) the GC system in each galaxy exhibits bimodal color distributions in all colors examined, but the shape of color histograms varies systematically depending on colors; (2) NGC 1399 shows that the mean colors of both blue and red GCs become bluer with increasing galactocentric radius; (3) NGC 1399 shows overabundance of GCs in the directions of NGC 1404 and NGC 1387, indicating their ongoing interactions; and (4) NGC 1399 also exhibits a 0.′5 offset between the center of the inner GC distribution and the galaxy's optical center, suggesting that NGC 1399 is not yet dynamically relaxed and may be undergoing merger events.

Original languageEnglish
Article number40
JournalAstrophysical Journal
Volume763
Issue number1
DOIs
Publication statusPublished - 2013 Jan 20

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globular clusters
photometry
galaxies
color
histogram
extremely high frequencies
histograms
merger
contamination
radii
interactions
distribution

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kim, Hak Sub ; Yoon, Suk Jin ; Sohn, Sangmo Tony ; Kim, Sang Chul ; Kim, Eunhyeuk ; Chung, Chul ; Lee, Sang Yoon ; Lee, Young Wook. / Wide-field multiband photometry of globular cluster systems in the fornax galaxy cluster. In: Astrophysical Journal. 2013 ; Vol. 763, No. 1.
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abstract = "We present wide-field multiband photometry of globular cluster (GC) systems in NGC 1399, NGC 1404, and NGC 1387 located in the central region of the Fornax galaxy cluster. Observation was carried out through U, B, V, and I bands, which marks one of the widest and deepest U-band studies on extragalactic GC systems. The present U-band photometry enables us to significantly reduce the contamination by a factor of two for faint sources (V 0 23.5). The main results based on some 2000 GC candidates around NGC 1399, NGC 1404, and NGC 1387 are as follows: (1) the GC system in each galaxy exhibits bimodal color distributions in all colors examined, but the shape of color histograms varies systematically depending on colors; (2) NGC 1399 shows that the mean colors of both blue and red GCs become bluer with increasing galactocentric radius; (3) NGC 1399 shows overabundance of GCs in the directions of NGC 1404 and NGC 1387, indicating their ongoing interactions; and (4) NGC 1399 also exhibits a 0.′5 offset between the center of the inner GC distribution and the galaxy's optical center, suggesting that NGC 1399 is not yet dynamically relaxed and may be undergoing merger events.",
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Wide-field multiband photometry of globular cluster systems in the fornax galaxy cluster. / Kim, Hak Sub; Yoon, Suk Jin; Sohn, Sangmo Tony; Kim, Sang Chul; Kim, Eunhyeuk; Chung, Chul; Lee, Sang Yoon; Lee, Young Wook.

In: Astrophysical Journal, Vol. 763, No. 1, 40, 20.01.2013.

Research output: Contribution to journalArticle

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AB - We present wide-field multiband photometry of globular cluster (GC) systems in NGC 1399, NGC 1404, and NGC 1387 located in the central region of the Fornax galaxy cluster. Observation was carried out through U, B, V, and I bands, which marks one of the widest and deepest U-band studies on extragalactic GC systems. The present U-band photometry enables us to significantly reduce the contamination by a factor of two for faint sources (V 0 23.5). The main results based on some 2000 GC candidates around NGC 1399, NGC 1404, and NGC 1387 are as follows: (1) the GC system in each galaxy exhibits bimodal color distributions in all colors examined, but the shape of color histograms varies systematically depending on colors; (2) NGC 1399 shows that the mean colors of both blue and red GCs become bluer with increasing galactocentric radius; (3) NGC 1399 shows overabundance of GCs in the directions of NGC 1404 and NGC 1387, indicating their ongoing interactions; and (4) NGC 1399 also exhibits a 0.′5 offset between the center of the inner GC distribution and the galaxy's optical center, suggesting that NGC 1399 is not yet dynamically relaxed and may be undergoing merger events.

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