214 citations · 1.6k across the 43 of their papers we have counts for
28 papers · 1 filter
Ongoing and fossil large-scale outflows detected in a high-redshift radio galaxy: [C II] observations of TN J09242201 at
Kianhong Lee, Masayuki Akiyama, Kotaro Kohno +13
We present Atacama Large Millimeter/submillimeter Array observations of the [C II] 158 m line and the underlying continuum emission of TN J09242201, which is one of the most…
Multi-line assessment of narrow-line regions in 3 radio galaxies
Koki Terao, Tohru Nagao, Kyoko Onishi +4
In this paper, we utilize high-quality rest-UV spectra of three radio galaxies at 3 observed with VLT/FORS2 to measure the flux of several emission lines including relativ…
The VANDELS ESO public spectroscopic survey: final Data Release of 2087 spectra and spectroscopic measurements
B. Garilli, R. McLure, L. Pentericci +94
VANDELS is an ESO Public Spectroscopic Survey designed to build a sample of high signal to noise, medium resolution spectra of galaxies at redshift between 1 and 6.5. Here we prese…
The Faint End of the Quasar Luminosity Function at from the Subaru Hyper Suprime-Cam Survey
Mana Niida, Tohru Nagao, Hiroyuki Ikeda +17
We present the quasar luminosity function at derived from the optical wide-field survey data obtained as a part of the Subaru strategic program (SSP) with Hyper Suprime-…
Metal enrichment in the circumgalactic medium and Lyα haloes around quasars at z 3
Yucheng Guo, Roberto Maiolino, Linhua Jiang +8
Deep observations have detected extended Ly emission nebulae surrounding tens of quasars at redshift 2 to 6. However, the metallicity of such extended haloes is still poorly und…
A NuSTAR and XMM-Newton Study of the Two Most Actively Star-forming Green Pea Galaxies (SDSS J0749+3337 and SDSS J0822+2241)
Taiki Kawamuro, Yoshihiro Ueda, Kohei Ichikawa +4
We explore X-ray evidence for the presence of active galactic nuclei (AGNs) in the two most actively star-forming Green Pea galaxies (GPs), SDSS J0749+3337 and SDSS J0822+2241, whi…
Does the mid-infrared-hard X-ray luminosity relation for active galactic nuclei depend on Eddington ratio?
Yoshiki Toba, Yoshihiro Ueda, Kenta Matsuoka +5
We revisit the correlation between the mid-infrared (6 m) and hard X-ray (2--10 keV) luminosities of active galactic nuclei (AGNs) to understand the physics behind it. We constr…
Ratio of black hole to galaxy mass of an extremely red dust-obscured galaxy at z = 2.52
Kenta Matsuoka, Yoshiki Toba, Megumi Shidatsu +7
We present a near-infrared (NIR) spectrum of WISE J1042+1641, an extremely red dust-obscured galaxy (DOG), which has been observed with the LIRIS on the 4.2m William Hershel Telesc…
Discovery of Dying Active Galactic Nucleus in Arp 187: Experience of Drastic Luminosity Decline within years
Kohei Ichikawa, Junko Ueda, Hyun-Jin Bae +4
Arp 187 is one of the fading active galactic nuclei (AGN), whose AGN activity is currently decreasing in luminosity. We investigate the observational signatures of AGN in Arp 187,…
MAGNUM survey: A MUSE-Chandra resolved view on ionized outflows and photoionization in the Seyfert galaxy NGC 1365
G. Venturi, E. Nardini, A. Marconi +24
Ionized outflows, revealed by broad asymmetric wings of the [OIII] line, are commonly observed in AGN but the low intrinsic spatial resolution of observations has generally prevent…
The mass-metallicity relation of high-z type-2 active galactic nuclei
Kenta Matsuoka, Tohru Nagao, Alessandro Marconi +5
The mass-metallicity relation (MZR) of type-2 active galactic nuclei (AGNs) at 1.2 < z < 4.0 is investigated by using high-z radio galaxies (HzRGs) and X-ray selected radio-quiet A…
The VANDELS ESO public spectroscopic survey: observations and first data release
L. Pentericci, R. J. McLure B. Garilli, O. Cucciati +93
This paper describes the observations and the first data release (DR1) of the ESO public spectroscopic survey "VANDELS, a deep VIMOS survey of the CANDELS CDFS and UDS fields". VAN…
The VANDELS ESO public spectroscopic survey
R. J. McLure, L. Pentericci, A. Cimatti +92
VANDELS is a uniquely-deep spectroscopic survey of high-redshift galaxies with the VIMOS spectrograph on ESO's Very Large Telescope (VLT). The survey has obtained ultra-deep optica…
Chemical enrichment and accretion of nitrogen-loud quasars
Kenta Matsuoka, Tohru Nagao, Roberto Maiolino +3
We present rest-frame optical spectra of 12 nitrogen-loud quasars at z ~ 2.2, whose rest-frame ultraviolet (UV) spectra show strong nitrogen broad emission lines. To investigate th…
An Optically Faint Quasar Survey at z~5 in the CFHTLS Wide Field: Estimates of the Black Hole Masses and Eddington Ratios
H. Ikeda, T. Nagao, K. Matsuoka +5
We present the result of our spectroscopic follow-up observation for faint quasar candidates at z~5 in a part of the Canada-France-Hawaii Telescope Legacy Survey wide field. We sel…
Active Galactic Nuclei with a Low-Metallicity Narrow-Line Region
Kota Kawasaki, Tohru Nagao, Yoshiki Toba +2
Low-metallicity active galactic nuclei (AGNs) are interesting to study the early phase of the AGN evolution. However most AGNs are chemically matured and accordingly low-metallicit…
Nature of hard X-ray (3-24 keV) detected luminous infrared galaxies in the COSMOS field
Kenta Matsuoka, Yoshihiro Ueda
We investigate the nature of far-infrared (70 um) and hard X-ray (3-24 keV) selected galaxies in the COSMOS field detected with both Spitzer and Nuclear Spectroscopic Telescope Arr…
The Complete Infrared View of Active Galactic Nuclei from the 70-month Swift/BAT Catalog
Kohei Ichikawa, Claudio Ricci, Yoshihiro Ueda +5
We systematically investigate the near- (NIR) to far-infrared (FIR) photometric properties of a nearly complete sample of local active galactic nuclei (AGN) detected in the Swift/B…
Near-infrared spectroscopy of nearby Seyfert galaxies: Is there evidence for the shock excitation in narrow-line regions?
Koki Terao, Tohru Nagao, Tetsuya Hashimoto +5
One of the unsettled, important problems in active galactic nuclei (AGNs) is the major ionization mechanism of gas clouds in their narrow-line regions (NLRs). In order to investiga…
Revisiting the Completeness and the Luminosity Function in High-Redshift Low-Luminosity Quasar Surveys
Mana Niida, Tohru Nagao, Hiroyuki Ikeda +4
Recent studies have derived quasar luminosity functions (QLFs) at various redshifts. However, the faint side of the QLF at high redshifts is still too uncertain. An accurate estima…
Rest-frame UV single-epoch black hole mass estimates of low-luminosity AGN at intermediate redshifts
Marios Karouzos, Jong-Hak Woo, Kenta Matsuoka +6
The ability to accurately derive black hole (BH) masses at progressively higher redshifts and over a wide range of continuum luminosities has become indispensable in the era of lar…
The sign of active galactic nucleus quenching in a merger remnant with radio jets
Kohei Ichikawa, Junko Ueda, Megumi Shidatsu +2
We investigate optical, infrared, and radio active galactic nucleus (AGN) signs in the merger remnant Arp 187, which hosts luminous jets launched in the order of yr ago but…
Near-Infrared Spectroscopy of Quasars at z~3 and Estimates of Their Supermassive Black Hole Masses
Yuriko Saito, Masatoshi Imanishi, Yosuke Minowa +8
We present the results of new infrared spectroscopic observations of 37 quasars at z~3, selected based on the optical r'-band magnitude and the availability of nearby bright stars…
The Quasar-LBG Two-point Angular Cross-correlation Function at z ~ 4 in the COSMOS Field
H. Ikeda, T. Nagao, Y. Taniguchi +15
In order to investigate the origin of quasars, we estimate the bias factor for low-luminosity quasars at high redshift for the first time. In this study, we use the two-point angul…