FINDING GALAXY GROUPS IN PHOTOMETRIC-REDSHIFT SPACE: THE PROBABILITY FRIENDS-OF-FRIENDS ALGORITHM
نویسندگان
چکیده
منابع مشابه
A fast algorithm for identifying Friends-of-Friends halos
We describe a simple and fast algorithm for identifying friends-of-friends clusters and prove its correctness. The algorithm avoids unnecessary expensive neighbor queries, uses minimal memory overhead, and rejects slowdown in high over-density regions. We define our algorithm formally based on pair enumeration, a problem that has been heavily studied in fast 2-point correlation codes and our re...
متن کاملFinding Close Friends on the Internet
We consider the problem of finding nearby applicationpeers (close friends) over the Internet. We focus on unicastonly solutions and introduce a new scheme —Beaconing— for finding peers that are near. Our scheme uses distance measurement points (called beacons) and can be implemented entirely in the application-layer without investing in large infrastructure changes. We present an extensive eval...
متن کاملOn Finding Better Friends in Social Networks
We study the dynamics of a social network. Each node has to decide locally which other node it wants to befriend, i.e., to which other node it wants to create a connection in order to maximize its welfare, which is defined as the sum of the weights of incident edges. This allows us to model the cooperation between nodes where every node tries to do as well as possible. With the limitation that ...
متن کاملPhotometric Properties of Low Redshift Galaxy Clusters
A recent comprehensive photometric survey of 45 low-z X-ray selected Abell clusters (López-Cruz 1997) has measured significant variations in the faint end slope of the luninosity function (LF). This result has indicated that dwarf galaxies (dGs) have different mixtures in relation with the cluster environment. Clusters having a central " cD-like " galaxy have a flatter faint end slope than non-...
متن کاملPhotometric Properties of Low-redshift Galaxy Clusters
A comprehensive multicolor survey was undertaken to investigate global optical properties of Abell clusters of galaxies. This survey was christened the LowRedshift Cluster Optical Survey (LOCOS). LOCOS was devised to search for patterns of galaxy evolution induced by the environment. The generated data base contains accurate deep CCD photometric measurements (Kron-Cousins R, B and I) for a samp...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2008
ISSN: 0004-6256,1538-3881
DOI: 10.1088/0004-6256/135/3/809