Oct 11 Tue 10:00～11:30 太陽系小天体セミナー Zoom
Oct 11 The 14:00～15:00 Tea Talk Zoom
Oct 12 Wed 10:30～12:00 SOKENDAI Colloquium Zoom
Oct 12 Wed 15:30～17:00 NAOJ Science Colloquium Zoom
Oct 14 Fri 13:30～15:00 Solar and Space Plasma Seminar Zoom/Insei Seminar Room
Oct 14 Fri 16:00～17:00 NAOJ Seminar Zoom/Large Seminar Room
詳細は以下をご覧下さい
10月11日（火）
キャンパス：三鷹
セミナー名：太陽系小天体セミナー
定例・臨時の別：定例
日時：10月11日（火曜日）10時00分～11時30分
場所：zoom
講演者：浦川聖太郎
世話人の連絡先
名前：渡部潤一
備考：テレビ会議またはスカイプによる参加も可
10月11日（火）
キャンパス：三鷹
セミナー名：Tea Talk
定例・臨時の別：臨時
日時：10/11（火）14：00～15：00
場所：Zoom
講演者：萩野 正興
所属：天文情報センター
タイトル：太陽と地球、ときどきフレア
世話人の連絡先：
-名前：藤田登起子
10月12日（水）
Campus：Mitaka
Seminar：SOKENDAI Colloquium
Regularly Scheduled/Sporadic：Regular
Date and time：October 12th, 2022 10:30-12:00
Place：zoom
Speaker 1: Yui Kasagi
Affiliation: SOKENDAI 4th year (D2) (Supervisor: Takayuki Kotani, Saeko Hayashi, Wako Aoki)
Title: Search for a Planetary-mass Companion around a Brown Dwarf, Gl 229B
Speaker 2: Ryota Ikeda
Affiliation: SOKENDAI 2nd year (M2) (Supervisor: Daisuke Iono, Ken-ichi Tadaki, Masayuki Tanaka)
Title: Playing with Gas Kinematics
Facilitator
-Name：Matsuda, Graduate Student Affairs Unit
10月12日（水）
Campus：Mitaka
Seminar：NAOJ Science Colloquium
Regularly Scheduled/Sporadic：Every Wednesday
Date and time：2022 Oct. 12, 15:30-17:00
Place：zoom
Speaker：Kikuta Satoshi
Affiliation：NAOJ
Title：UV & Lyα halos of Lyα emitters across environments at z = 2.84
Abstract：We present UV & Lyα radial surface brightness (SB) profiles of Lyα emitters (LAEs) at z = 2.84
detected with the Hyper Suprime-Cam (HSC) on the Subaru Telescope. The depth of our data, together
with the wide field coverage including a protocluster, enable us to study the dependence of Lyα halos
(LAHs) on various galaxy properties, including Mpc-scale environments. UV and Lyα images of 3490
LAEs are extracted, and stacking the images yields SB sensitivity of ~1e-20 erg/s/cm^2/arcsec^2
in Lyα. Fitting of the two-component exponential function gives the scalelengths of 1.56 and 10.4 pkpc.
Dividing the sample according to their photometric properties, we find that while the dependence of
halo scalelength on environment outside of the protocluster core is not clear, LAEs in the central regions
of protoclusters have very large LAHs and may be related to diffuse Lyα emission from abundant cool
gas permeating the forming protocluster core irradiated by active members including a hyperluminous
QSO. For the first time, we identify “UV halos” around bright LAEs which are probably due to a
few lower-mass satellite galaxies. Through comparison with recent numerical simulations, we conclude
that, while scattered Lyα photons from the host galaxies are the dominant contributor to LAHs, star
formation in satellites evidently contributes significantly to LAHs, and that fluorescent Lyα emission
may be boosted within protocluster cores at cosmic noon and/or near bright QSOs.
Facilitator
-Name：Akimasa Kataoka
10月14日（金）
Campus： Mitaka
Seminar： Solar and Space Plasma Seminar
Regularly Scheduled/Sporadic： Scheduled
Date and time：14th Oct (Fri), 13:30-15:00
Place： hybrid (Insei Seminar Room and Zoom)
Speaker：Hidetaka Kuniyoshi
Affiliation：University of Tokyo
Title：Magnetic tornado – an alternative solar/stellar coronal heating mechanism
Three-dimensional magnetohydrodynamic (MHD) simulations are performed to investigate the energy transport mechanism contributing to the heating of a solar coronal loop. We model a coronal loop from the upper convection zone to the corona with self-consistent thermal convection. A coronal loop consists of multiple flux tubes, of which footpoints are concentrated into kilogauss flux tubes, referred to as magnetic concentrations (MCs). Our setup allows us to study not only the generation of MHD waves inside an individual flux tube but also the interactions of neighboring flux tube footpoints. Consequently, we have found a merger of MCs that induces a magnetic tornado, an energy channeling system from the photosphere to the corona, accompanied by a twisted magnetic field. Furthermore, the energy flux the magnetic tornado carries into the corona is enhanced four times greater than usual. Thus, magnetic tornadoes are likely to contribute considerably to coronal heating.
Facilitator
-Name：Takayoshi oba
Comment：in English
10月14日（金）
Campus: Mitaka
Seminar: NAOJ seminar
Regularly Scheduled/Sporadic: Every Friday
Date and Time: 2022 October 14 16:00-17:00
Place: Zoom / Large Seminar Room
Speaker:Peter Behroozi（University of Arizona / Division of Science, NAOJ）
Title: TRINITY: the Black Hole — Galaxy – Halo Relationship from z=0 to z=7
Abstract:
We present a new empirical model, Trinity, that observationally constrains the
joint relationship between supermassive black holes (SMBHs), galaxies, and
dark matter halos from z=0 to z=7. Trinity is unique in its ability to
systematically combine constraints from a wide variety of SMBH and galaxy
observations, allowing the resulting inferences to be free of theoretical
assumptions that have been present in past models. We can hence recover the
average growth and merger histories of all detectable SMBHs, describe the
evolution of the SMBH—galaxy relationship through time, and discuss
correlations between galaxy growth and SMBH growth. We also provide a
natural solution to the origin of the high accretion rates necessary to grow the
largest SMBHs observed at z>6
Facilitator: 守屋 尭 / Moriya, Takashi