A QSO host galaxy and its Lyalpha emission at z=6.43 (2009)
Goto, Tomotsugu, Utsumi, Yousuke, Furusawa, Hisanori, Miyazaki, Satoshi, Komiyama, Yutaka
We report an optical detection of an extended structure around a QSO at z=6.43 (CFHQSJ2329-0301, the highest redshift QSO currently known) in deep z' and z_r-band images of the Subaru/Suprime-Cam....
Choi, Yumi, Goto, Tomotsugu, Yoon, Suk-Jin
Strong Balmer absorption lines and the lack of Ha and [OII] emission lines signify that E+As are post-starburst systems. Recent studies suggest that E+As may undergo the transition from the `blue...
The Mid-infrared View of Red Sequence Galaxies in Abell 2218 with AKARI (2009)
Ko, Jongwan, Im, Myungshin, Lee, Hyung Mok, Lee, Myung Gyoon, Hopwood, Ros H., Serjeant, Stephen, ...
We present the {\it AKARI} InfraRed Camera (IRC) imaging observation of early-type galaxies in A2218 at z $\simeq$ 0.175. Mid-infrared (MIR) emission from early-type galaxies traces circumstellar...
Goto, Tomotsugu, Hanami, Hitoshi, Im, Myungshin, Imai, Koji, Inami, Hanae, Ishigaki, Tsuyoshi, ...
There is a huge gap between properties of red-sequence selected massive galaxy clusters at z3. It is important to understand when and how the z>3 proto-clusters evolve into passive clusters at z1,...
E+A and Companion Galaxies - I : A Catalogue and Statistics (2008)
Yamauchi, Chisato, Yagi, Masafumi, Goto, Tomotsugu
Based on our intensive spectroscopic campaign with the GoldCam spectrograph on the Kitt Peak National Observatory (KPNO) 2.1-m telescope, we have constructed the first catalogue of E+A galaxies with...
Goto, Tomotsugu, Yagi, Masafumi, Yamauchi, Chisato
We have performed a spatially-resolved medium resolution long-slit spectroscopy of a nearby E+A (post-starburst) galaxy system, SDSSJ161330.18+510335.5. This E+A galaxy has an obvious companion...
Timeline analysis and wavelet multiscale analysis of the AKARI All-Sky Survey at 90 micron (2008)
Wang, Lingyu, Rowan-Robinson, Michael, Yamamura, Issei, Shibai, Hiroshi, Savage, Rich, Oliver, Seb, ...
We present a careful analysis of the point source detection limit of the AKARI All-Sky Survey in the WIDE-S 90 $\mu$m band near the North Ecliptic Pole (NEP). Timeline Analysis is used to detect IRAS...
E+A galaxies have been interpreted as post-starburst galaxies based on the presence of strong Balmer absorption lines combined with the absence of major emission lines ([OII] nor H$\alpha$). As a...
Spatially Resolved Spectroscopy of Passive Spiral Galaxies (2008)
Ishigaki, Miho, Goto, Tomotsugu, Matsuhara, Hideo
Passive spiral galaxies, despite their spiral morphological appearance, do not have any emission lines indicative of ongoing star formation in their optical spectra. Previous studies have suggested...
Integrated field spectroscopy of E+A (post-starburst) galaxies with the Kyoto3DII (2008)
Goto, Tomotsugu, Kawai, Atsushi, Shimono, Atsushi, Sugai, Hajime, Yagi, Masafumi, Hattori, Takashi
We have performed a two-dimensional spectroscopy of three nearby E+A (post-starburst) galaxies with the Kyoto3DII integral field spectrograph. In all the cases, Hdelta absorption is stronger at the...
Timeline analysis and wavelet multiscale analysis of the AKARI all-sky survey at 90 μm (2008)
Wang, Lingyu, Rowan-Robinson, Michael, Yamamura, Issei, Shibai, Hiroshi, Savage, Rich, Oliver, Seb, ...
The Far-Infrared Surveyor (FIS) for AKARI (2007)
Kawada, Mitsunobu, Baba, Hajime, Barthel, Peter D., Clements, David, Cohen, Martin, Doi, Yasuo, ...
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 detectors. The FIS...
The Far-Infrared Properties of Spatially Resolved AKARI Observations (2007)
Jeong, Woong-Seob, Nakagawa, Takao, Yamamura, Issei, Pearson, Chris P., Savage, Richard S., Lee, Hyung Mok, ...
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 the mission. We...
Abundance diagnosis of E+A (post-starburst) galaxies (2007)
E+A galaxies are characterized as a galaxy with strong Balmer absorption lines but without any [OII] or H$\alpha$ emission lines. The existence of strong Balmer absorption lines means that E+A...
The Far-Infrared Surveyor (FIS) for AKARI (2007)
Kawada, Mitsunobu, Baba, Hajime, Barthel, Peter D., Clements, David, Cohen, Martin, Doi, Yasuo, ...
The infrared astronomical mission AKARI (2007)
Murakami, Hiroshi, Baba, Hajime, Barthel, Peter D., Clements, David L., Cohen, Martin, Doi, Yasuo, ...
Deep J-band imaging of high redshift QSO candidates with the Himalayan Chandra Telescope (2006)
High redshift QSOs (redshift$>$5.7) are highly important objects. If such QSOs may be found, their spectra will reveal the onset of reionization of the intergalactic medium (Gunn-Peterson trough),...
Discovery of a new high redshift QSO at z=5.96 with the Subaru telescope (2006)
We report a discovery of a new high redshift quasar at $z=5.96$, observed with the FOCAS long-slit spectrograph on board the Subaru telescope. The spectrum shows strong and broad Ly$\alpha$+NV...
Post-starburst--AGN Connection: Spatially Resolved Spectroscopy of Hdelta-Strong AGNs (2006)
Ever since the co-existence of an active galactic nucleus (AGN) and a starburst was observationally discovered, there has been a significant controversy over whether there is a physical connection...
Environmental Effects on Galaxy Evolution Based on the SDSS (2006)
We have constructed a large, uniform galaxy cluster catalog from the Sloan Digital Sky Survey data. By studying the morphology--cluster-centric-radius relation, we have found two characteristic...
Are Passive Spiral Galaxies truly 'passive' and 'spiral'?: a Near-Infrared perspective (2005)
Yamauchi, Chisato, Goto, Tomotsugu
Passive spiral galaxies - unusual galaxies with spiral morphologies but without any sign of on-going star formation - have recently been shown to exist preferentially in cluster infalling regions....
Radial and 2D Colour Properties of E+A Galaxies (2005)
Yamauchi, Chisato, Goto, Tomotsugu
We investigated the radial colour gradient and two-dimensional (2D) colour properties of 22 E+A galaxies with 5.5 < Hdelta equivalent width(EW) < 8.5\AA and 49 normal early-type galaxies as a control...
Yamauchi, Chisato, Ichikawa, Shin-ichi, Doi, Mamoru, Yasuda, Naoki, Yagi, Masafumi, Fukugita, Masataka, ...
We devise improved photometric parameters for the morphological classification of galaxies using a bright sample from the First Data Release of the Sloan Digital Sky Survey. In addition to using an...
Total Galaxy Magnitudes and Effective Radii from Petrosian Magnitudes and Radii (2005)
Graham, Alister W., Driver, Simon P., Petrosian, Vahe', Conselice, Christopher J., Bershady, Matthew A., Crawford, Steven M., ...
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 inverted Petrosian...
Optical Properties of 4248 IRAS Galaxies (2005)
We have investigated optical properties of 4248 infrared galaxies (IRGs) by positionally matching data from the IRAS and the SDSS DR3. Our sample includes 3 hyper luminous infrared galaxies (L...
E+A galaxies are characterized as a galaxy with strong Balmer absorption lines but without any [OII] nor H$\alpha$ emission lines. The existence of strong Balmer absorption lines indicates that E+A...
There has been plenty of observational evidence of cluster galaxy evolution. However, it has been difficult to identify the origin of the cluster galaxy evolution. Here we show that gravitational...
The C4 clustering algorithm: clusters of galaxies in the sloan digital sky survey (2005)
Miller, Christopher J., Nichol, Robert C., Reichart, Daniel, Wechsler, Risa H., Evrard, August E., Annis, James, ...
The C4 clustering algorithm: Clusters of galaxies in the Sloan Digital Sky Survey (2005)
Miller, Christopher J., Nichol, Robert C., Reichart, Daniel, Wechsler, Risa H., Evrard, August E., Annis, James, ...
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 Survey (SDSS). The C4...
Total galaxy magnitudes and effective radii from Petrosian magnitudes and radii (2005)
Graham, Alister W., Driver, Simon P., Petrosian, Vahe, Conselice, Christopher J., Bershady, Matthew A., Crawford, Steven M., ...
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 2RP, with the inverted Petrosian...
Total galaxy magnitudes and effective radii from Petrosian magnitudes and radii (2005)
Graham, Alister W., Driver, Simon P., Petrosian, Vahé, Conselice, Christopher J., Bershady, Matthew A., Crawford, Steven M., ...
Abstract not available.
Total galaxy magnitudes and effective radii from Petrosian magnitudes and radii (2005)
Graham, Alister W., Driver, Simon P., Petrosian, Vahé, Conselice, Christopher J., Bershady, Matthew A., Crawford, Steven M., ...
Abstract not available.
Total galaxy magnitudes and effective radii from Petrosian magnitudes and radii (2005)
Graham, Alister W., Driver, Simon P., Petrosian, Vahe, Conselice, Christopher J., Bershady, Matthew A., Crawford, Steven M., ...
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 2RP, with the inverted Petrosian...
Are E+A Galaxies Dusty-Starbursts?: VLA 20cm Radio Continuum Observation (2004)
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 galaxies have...
The Luminosity Functions of the Galaxy Cluster MS1054-0321 at z=0.83 based on ACS Photometry (2004)
Goto, Tomotsugu, Postman, Marc, Cross, Nicholas J. G., Illingworth, G. D., Tran, K., Magee, D., ...
We present new measurements of the galaxy luminosity function (LF) and its dependence on local galaxy density, color, morphology, and clustocentric radius for the massive z=0.83 cluster MS1054-0321....
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 version, the...
The Origin of E+A Galaxies (2004)
Goto, Tomotsugu, Collaboration, The SDSS
E+A galaxies are galaxies with strong Balmer absorption lines and with no significant emission in [OII] or H$\alpha$ lines. The existence of strong Balmer absorption lines shows that these galaxies...
Tanaka, Masayuki, Goto, Tomotsugu, Okamura, Sadanori, Shimasaku, Kazuhiro, Brinkman, Jon
We investigate the environmental dependence of star formation and the morphology of galaxies in the local universe based on a volume-limited sample (0.030
The Evolution of Galaxies in and around Clusters at High-Redshift (2004)
Fujita, Yutaka, Goto, Tomotsugu
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 efficiency of...
Are Passive Spiral Galaxies Truly "Passive" and "Spiral"? : Near-Infrared Perspective (2004)
Yamauchi, Chisato, Goto, Tomotsugu
Passive spiral galaxies -- unusual galaxies with spiral morphology without any sign of on-going star formation -- have recently been discovered to exist preferentially in cluster infalling regions...
Oguri, Masamune, Inada, Naohisa, Keeton, Charles R., Pindor, Bartosz, Hennawi, Joseph F., Gregg, Michael D., ...
We study the recently discovered gravitational lens SDSS J1004+4112, the first quasar lensed by a cluster of galaxies. It consists of four images with a maximum separation of 14.62". The system was...
Selection and photometric properties of K+A galaxies (2004)
Quintero, Alejandro D., Hogg, David W., Blanton, Michael R., Schlegel, David J., Eisenstein, Daniel J., Gunn, James E., ...
Two different simple measurements of galaxy star formation rate with different timescales are compared empirically on 156,395 fiber spectra of galaxies with r < 17.77 mag taken from the Sloan...
Selection and photometric properties of K+A galaxies (2004)
Quintero, Alejandro D., Hogg, David W., Blanton, Michael R., Schlegel, David J., Eisenstein, Daniel J., Gunn, James E., ...
Two different simple measurements of galaxy star formation rate with different timescales are compared empirically on 156,395 fiber spectra of galaxies with r < 17.77 mag taken from the Sloan...
Goto, Tomotsugu, Yagi, Masafumi, Tanaka, Masayuki, Okamura, Sadanori
We have investigated the redshift evolution of the colour--cluster-centric-radius relation and the morphology--cluster-centric-radius relation in three redshift bins, $0.02\leq z\leq 0.14$, $0.14<...
The Environmental Effects on Galaxy Evolution Based on the SDSS Data (2003)
Goto, Tomotsugu, Collaboration, The SDSS
By constructing a large, uniform galaxy cluster catalog from the SDSS data, we have found that cluster galaxies evolve both spectrally and morphologically. By studying the...
The Morphology-Density Relation in the Sloan Digital Sky Survey (2003)
Goto, Tomotsugu, Yamauchi, Chisato, Fujita, Yutaka, Okamura, Sadanori, Sekiguchi, Maki, Smail, Ian, ...
We have studied the morphology-density relation and morphology--cluster-centric-radius relation using a volume limited sample (0.05$
Environmental Effects on Galaxy Evolution (2003)
It is a remarkable feature that various properties of galaxies vary according to their environments. However, only little has been known on the origin of this variety in galaxies. Using the Sloan...
Selection and photometric properties of K+A galaxies (2003)
Quintero, Alejandro D., Hogg, David W., Blanton, Michael R., Schlegel, David J., Eisenstein, Daniel J., Gunn, James E., ...
Two different simple measurements of galaxy star formation rate with different timescales are compared empirically on $156,395$ fiber spectra of galaxies with $r
A Merged Catalog of Clusters of Galaxies from Early SDSS Data (2003)
Bahcall, Neta A., McKay, Timothy A., Annis, James, Kim, Rita, Dong, Feng, Hansen, Sarah, ...
We present a catalog of 799 clusters of galaxies in the redshift range z_est = 0.05 - 0.3 selected from ~400 deg^2 of early SDSS commissioning data along the celestial equator. The catalog is based...
The Morphological Butcher-Oemler effect in the SDSS Cut&Enhance Galaxy Cluster Catalog (2003)
Goto, Tomotsugu, Okamura, Sadanori, Yagi, Masafumi, Sheth, Ravi K., Bahcall, Neta A., Zabel, Shane A., ...
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 consists of 514...
The Environment of Passive Spiral Galaxies in the SDSS (2003)
Goto, Tomotsugu, Okamura, Sadanori, Sekiguchi, Maki, Bernardi, Mariangela, Brinkmann, Jon., Gomez, Percy L., ...
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 activity. These...
Hdelta-Selected Galaxies in the Sloan Digital Sky Survey I: The Catalog (2003)
Goto, Tomotsugu, Nichol, Robert C., Miller, Christopher J., Bernardi, Mariangela, Hopkins, Andrew, Tremonti, Christy, ...
[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 absorption line. These...
The Interplay of Cluster and Galaxy Evolution (2003)
Nichol, Robert C., Miller, Christopher J., Goto, Tomotsugu
We review here the interplay of cluster and galaxy evolution. As a case study, we consider the Butcher-Oemler effect and propose that it is the result of the changing rate of cluster merger events in...
Gomez, Percy, Nichol, Robert, Miller, Chris, Balogh, Michael, Goto, Tomotsugu, Zabludoff, Ann, ...
(Abridged) We present in this paper a detailed analysis of the effect of environment on the star-formation activity of galaxies within the EDR of the SDSS. We have used the Halpha emission line to...
The Cluster Mass Function from Early SDSS Data: Cosmological Implications (2002)
Bahcall, Neta A., Dong, Feng, Bode, Paul, Kim, Rita, Annis, James, McKay, Timothy A., ...
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 = 0.1 - 0.2 are used....
Goto, Tomotsugu, Okamura, Sadanori, Mckay, Timothy A., Annis, James, Bahcall, Neta A., Bernardi, Mariangela, ...
We present here results on the composite luminosity functions of galaxies in the clusters of galaxies selected from the SDSS Cut and Enhance cluster catalog (CE; Goto et al. 2001). We construct the...
The Cut & Enhance method : selecting clusters of galaxies from the SDSS commissioning data (2001)
Goto, Tomotsugu, Sekiguchi, Maki, Nichol, Robert C., Bahcall, Neta A., Kim, Rita S. J., Annis, James, ...
We describe an automated method, the Cut & Enhance method (CE) for detecting clusters of galaxies in multi-color optical imaging surveys. This method uses simple color cuts, combined with a density...