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Evolution of Massive Protostars with High Accretion Rates
Takashi Hosokawa, Kazuyuki Omukai
Formation of massive stars by accretion requires a high accretion rate of > 10^-4 M_sun/yr to overcome the radiation pressure barrier of the forming stars. Here, we study evolution…
Hard X-rays from Ultra-Compact HII Regions in W49A
M. Tsujimoto, T. Hosokawa, E. D. Feigelson +2
We report the Chandra detection of hard X-ray emission from the Welch ring in W49A, an organized structure of ultra-compact (UC) HII regions containing a dozen nascent early-type s…
Trapping of the HII and Photodissociation Region in a Radially Stratified Molecular Cloud
Takashi Hosokawa
We study the expansion of the ionization and dissociation fronts (DFs) in a radially stratified molecular cloud, whose density distribution is represented as n(r) \propto r^-w. We…
Dynamical Expansion of Ionization and Dissociation Front around a Massive Star : A Starburst Mechanism
Takashi Hosokawa, Shu-ichiro Inutsuka
We quantitatively examine the significance of star formation triggered in the swept-up shell around an expanding HII region. If the swept-up molecular gas is sufficiently massive,…
Dynamical Formation of the Dark Molecular Hydrogen Clouds around Diffuse HII Regions
Takashi Hosokawa, Shu-ichiro Inutsuka
We examine the triggering process of molecular cloud formation around diffuse HII regions. We calculate the time evolution of the shell as well as of the HII region in a two-phase…
Dynamical Expansion of Ionization and Dissociation Front around a Massive Star. II. On the Generality of Triggered Star Formation
Takashi Hosokawa, Shu-ichiro Inutsuka
We analyze the dynamical expansion of the HII region, photodissociation region, and the swept-up shell, solving the UV- and FUV-radiative transfer, the thermal and chemical process…
Dynamical Expansion of Ionization and Dissociation Front around a Massive Star. I. A Mode of Triggered Star Formation
Takashi Hosokawa, Shu-ichiro Inutsuka
We analyze the dynamical expansion of the HII region and outer photodissociation region (PDR) around a massive star by solving the UV and FUV radiation transfer and the thermal and…
Gravitational-Wave Radiation from Magnetized Accretion Disks
S. Mineshige, T. Hosokawa, M. Machida +1
The detectability of gravitational wave (GW) radiation from accretion disks is discussed based on various astrophysical contexts. In order to emit GW radiation, the disk shape shou…
Constraining the Lifetime of QSOs with Present-day Mass Function of Supermassive Black Holes
T. Hosokawa
Using the theoretical models of the QSO formation, we can reproduce optical QSO luminosity functions (LFs) at high redshifts (z > 2.2). Two different models can reproduce LFs succe…
The relation between the mid-infrared emission and Black Hole Mass in Active Galactic Nuclei: A direct way to probe black hole growth?
A. Alonso-Herrero, V. D. Ivanov, R. Jayawardhana +1
We use a large, heterogeneous sample of local active galactic nuclei (AGN) that includes Seyfert 1s, Seyfert 2s and PG quasars to investigate for the first time the relation betwee…
Theoretical Models of Multi-waveband QSO Luminosity Functions
T. Hosokawa, S. Mineshige, T. Kawaguchi +2
Cosmological evolution of the QSO luminosity functions (LFs) at NIR/optical/X-ray bands for 1.3 < z < 3.5 is investigated based on the realistic QSO spectra. The accretion-disk the…