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Galaxy Clusters at 0.9<z<1.7 in the AKARI NEP deep field
Tomotsugu Goto, Hitoshi Hanami, Myungshin Im +11
There is a huge gap between properties of red-sequence selected massive galaxy clusters at z<1 and Lyman-break selected proto-clusters at z>3. It is important to understand when an…
The Far-Infrared Surveyor (FIS) for AKARI
Mitsunobu Kawada, Hajime Baba, Peter D. Barthel +57
The Far-Infrared Surveyor (FIS) is one of two focal plane instruments on the AKARI satellite. FIS has four photometric bands at 65, 90, 140, and 160 um, and uses two kinds of array…
The Infrared Astronomical Mission AKARI
H. Murakami, H. Baba, P. Barthel +90
AKARI, the first Japanese satellite dedicated to infrared astronomy, was launched on 2006 February 21, and started observations in May of the same year. AKARI has a 68.5 cm cooled…
The Far-Infrared Properties of Spatially Resolved AKARI Observations
Woong-Seob Jeong, Takao Nakagawa, Issei Yamamura +29
We present the spatially resolved observations of IRAS sources from the Japanese infrared astronomy satellite AKARI All-Sky Survey during the performance verification (PV) phase of…
Deep J-band imaging of high redshift QSO candidates with the Himalayan Chandra Telescope
Tomotsugu Goto
High redshift QSOs (redshift5.7) are highly important objects. If such QSOs may be found, their spectra will reveal the onset of reionization of the intergalactic medium (Gunn-P…
Discovery of a new high redshift QSO at z=5.96 with the Subaru telescope
Tomotsugu Goto
We report a discovery of a new high redshift quasar at , observed with the FOCAS long-slit spectrograph on board the Subaru telescope. The spectrum shows strong and broad L…
Total Galaxy Magnitudes and Effective Radii from Petrosian Magnitudes and Radii
Alister W. Graham, Simon P. Driver, Vahe' Petrosian +4
Petrosian magnitudes were designed to help with the difficult task of determining a galaxy's total light. Although these magnitudes (taken here as the flux within 2R_P, with the in…
The C4 Clustering Algorithm: Clusters of Galaxies in the Sloan Digital Sky Survey
Christopher J. Miller, Robert Nichol, Dan Reichart +15
We present the "C4 Cluster Catalog", a new sample of 748 clusters of galaxies identified in the spectroscopic sample of the Second Data Release (DR2) of the Sloan Digital Sky Surve…
Are E+A Galaxies Dusty-Starbursts?: VLA 20cm Radio Continuum Observation
Tomotsugu Goto
E+A galaxies are characterized as a galaxy with strong Balmer absorption lines but without any [OII] or Halpha emission lines. Strong Balmer absorption lines indicate that E+A gala…
Do star formation rates of galaxy clusters depend on mass?: blue/late-type fractions, total star formation rates of 115 galaxy clusters as a function of cluster virial mass
Tomotsugu Goto
There has been plenty of observational evidence of cluster galaxy evolution such as the Butcher-Oemler effect and the decrease in S0 fraction with increasing redshift. As a modern…
The Evolution of Galaxies in and around Clusters at High-Redshift
Yutaka Fujita, Tomotsugu Goto
In this paper, we focus on ram-pressure stripping and evaporation of disk galaxies in and around a cluster. We show that the evolution of the disk surface density affects the effic…
Evolution of the Colour--Radius Relation and the Morphology--Radius Relation in the SDSS Galaxy Clusters
Tomotsugu Goto, Masafumi Yagi, Masayuki Tanaka +1
We have investigated the redshift evolution of the colour--cluster-centric-radius relation and the morphology--cluster-centric-radius relation in three redshift bins, $0.02\leq z\l…
Hdelta-Selected Galaxies in the Sloan Digital Sky Survey I: The Catalog
Tomotsugu Goto, Robert C. Nichol, Christopher J. Miller +20
[Abridged] We present here a new and homogeneous sample of 3340 galaxies selected from the Sloan Digital Sky Survey (SDSS) based solely on the observed strength of their Hdelta abs…
The Environment of Passive Spiral Galaxies in the SDSS
Tomotsugu Goto, Sadanori Okamura, Maki Sekiguchi +15
In previous work on galaxy clusters, several authors reported a discovery of an unusual population of galaxies, which have spiral morphologies, but do not show any star formation a…
The Morphological Butcher-Oemler effect in the SDSS Cut&Enhance Galaxy Cluster Catalog
Tomotsugu Goto, Sadanori Okamura, Masafumi Yagi +14
We investigate the evolution of the fractions of late type cluster galaxies as a function of redshift, using one of the largest, most uniform cluster samples available. The sample…
The Cluster Mass Function from Early SDSS Data: Cosmological Implications
Neta A. Bahcall, Feng Dong, Paul Bode +15
The mass function of clusters of galaxies is determined from 400 deg^2 of early commissioning imaging data of the Sloan Digital Sky Survey; ~300 clusters in the redshift range z =…