Birleşen Galaksi Kümesine Optik Bakış: Abell 2254

Öz

Bu çalışmada, Antalya, Türkiye'de TÜBİTAK-RTT150 Teleskopu tarafından gözlemlenen birleşen gökada kümesinin (z=0.178) Abell 2254 (A2254) optik gözlemlerini sunuyoruz. Birleştirilmiş CCD görüntü sonuçları rapor edilmiştir. İlk kez kümenin her bir üyesi için B, V ve R parlaklık değerlerini belirledik. Kümeye ait tüm galaksiler için Renk Parlaklık Şemasını sunuyoruz. Kırmızı galaksilerin sayısının mavi galaksilerden daha fazla olduğu sonucunu bulduk. B band verilerini kullanarak gökada parlaklık fonksiyonunu (GLF) elde ettik. Burada amacımız büyük küme birleşmesinin galaksi özellikleri üzerindeki etkilerini daha iyi anlamak için analiz etmektir. Abell 2254'ün GLF'sinin B bandında bir Schechter fonksiyonu ile uyduğu görüldü. Schechter fonksiyonunun en uygun parametreleri, B bandındaki karakteristik mutlak büyüklük M_B^*=〖19,67〗_(-0,96)^(+0,84) mag ve sönük uçtaki eğim α=〖-1,29〗_(-0,34)^(+0,23) bulunmuştur.

Anahtar Kelimeler

• Galaksiler: kümeler: Özel: Abell 2254
• Galaksiler: Kümeler: Fotometri
• Işınım gücü fonksiyonu
• Galaksiler: Kümeler: Fotometri,Işınım gücü fonksiyonu
• galaksiler-istatistik.

Optical View of a Merging Galaxy Cluster: Abell 2254

Abstract

We present here the optical observations of a merging galaxy cluster (z=0.178) Abell 2254 (A2254) observed by the TÜBİTAK- RTT150 Telescope in Antalya, Turkey. Its integrated CCD imaging results are reported. B, V, and R brightness values are revealed for each member of the cluster, for the first time. We present the Color Magnitude Diagram of A2254 for all galaxies. We found that the number of red galaxies is more than blue galaxies. We have obtained the galaxy luminosity function (GLF) using the B band data. Here, we aim to analyze the effects of major cluster mergers on galaxy properties for better understanding. We have seen that the GLF of Abell 2254 can be fitted with a single Schechter function in the B band. The best-fitting parameters of the Schechter function are the characteristic absolute magnitude in the B band M_B^*=〖19,67〗_(-0,96)^(+0,84) mag, and the slope at the faint end of the GLF α=〖-1,29〗_(-0,34)^(+0,23) for galaxies.

Keywords

• Galaxies: clusters: individual: Abell 2254
• galaxies: clusters. Galaxies:photometry
• Luminosity function-galaxies-statistics.
• Galaxies: clusters: individual: Abell 2254, galaxies: clusters. Galaxies:photometry, Luminosity function-galaxies-statistics.

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