Results 1 to 10 of about 434 (176)

HiGas in Higher Density Regions of the Intergalactic Medium [PDF]

The Astronomical Journal, 2004
Using H I absorption alone, we attempt to separate H I absorption lines in quasar spectra into two categories; HDLs (Higher Density Lines) and LDLs (Lower Density Lines), and we discuss the difference in their physical properties. We deblend and fit all H I lines with Voigt profiles, and make an unbiased sample of H I lines covering a wide column ...
Misawa, T., Tytler, D., Iye, M., Paschos, P., Norman, M., Kirkman, D., O'Meara, J., Suzuki, N., Kashikawa, N.   +8 more
openaire   +2 more sources

Quasar Radiative Feedback May Suppress Galaxy Growth on Intergalactic Scales at z = 6.3

The Astrophysical Journal Letters
We present observational evidence that intense ionizing radiation from a luminous quasar suppresses nebular emission in nearby galaxies on intergalactic scales at z = 6.3.
Yongda Zhu, Eiichi Egami, Xiaohui Fan, Fengwu Sun, George D. Becker, Christopher Cain, Huanqing Chen, Anna-Christina Eilers, Yoshinobu Fudamoto, Jakob M. Helton, Xiangyu Jin, Maria Pudoka, Andrew J. Bunker, Zheng Cai, Jaclyn B. Champagne, Zhiyuan Ji, Xiaojing Lin, Weizhe Liu, Hai-Xia Ma, Zheng Ma, Roberto Maiolino, George H. Rieke, Marcia J. Rieke, Pierluigi Rinaldi, Yang Sun, Wei Leong Tee, Feige Wang, Jinyi Yang, Minghao Yue, Junyu Zhang   +29 more
doaj   +1 more source

Negative and Positive Outflow-Feedback in Nearby (U)LIRGs

Frontiers in Astronomy and Space Sciences, 2017
The starburst-AGN coexistence in local (U)LIRGs makes these galaxies excellent laboratories for the study of stellar and AGN outflows and feedback. Outflows regulate star formation and AGN activity, redistributing gas, dust and metals over large scales ...
Sara Cazzoli
doaj   +1 more source

HCG 57: Evidence for Shock-heated Intergalactic Gas from X-Rays and Optical Emission Line Spectroscopy

The Astrophysical Journal
We present Chandra and XMM-Newton X-ray observations of the compact group HCG 57, and optical integral field spectroscopy of the interacting galaxy pair HCG 57A/D.
Ewan O’Sullivan, P. N. Appleton, B. A. Joshi, Lauranne Lanz, Katherine Alatalo, Jan M. Vrtilek, Andreas Zezas, Laurence P. David   +7 more
doaj   +1 more source

Compton Scattering of Electrons in the Intergalactic Medium

The Astrophysical Journal
This paper investigates the distribution and implications of cosmic-ray electrons within the intergalactic medium (IGM). Utilizing a synthesis model of the extragalactic background, we evolve the spectrum of Compton-included cosmic rays.
Yuanyuan Yang, Heyang Long, Christopher M. Hirata   +2 more
doaj   +1 more source

Upper Limits on the Mass of Cool Gas in the Circumgalactic Medium of Dwarf Galaxies

The Astrophysical Journal Letters
We use H i absorption measurements to constrain the amount of cool (≈10 ^4 K), photoionized gas in the circumgalactic medium (CGM) of dwarf galaxies with M _*  = 10 ^6.5−9.5 M _⊙ in the nearby Universe ( z  
Yakov Faerman, Yong Zheng, Benjamin D. Oppenheimer   +2 more
doaj   +1 more source

Unveiling the Galactic Baryon Cycle Process by an Empirical Model

The Astrophysical Journal
We propose an empirical model to describe and constrain the baryon cycle process during galaxy evolution. This model utilizes the evolution of star formation rate, derived from the stellar mass–halo mass relations across different redshifts, and the cold
Yaoxin Chen, Xi Kang, Hong Guo, Hou-Zun Chen, Jiafeng Lu   +4 more
doaj   +1 more source

WLM: Dynamics of an isolated dwarf irregular galaxy under ram pressure in the Local Group

Astronomy & Astrophysics
The Wolf–Lundmark–Melotte (WLM) galaxy is an archetypal dwarf irregular galaxy that has not experienced interactions with major Local Group galaxies within the past 8 Gyr.
Kolhe Neel, Hammer Francois, Yang Yanbin, Namumba Brenda, Chemin Laurent, Amram Philippe, Ianjamasimanana Roger, Carignan Claude   +7 more
doaj   +1 more source

The Pitfalls of Using Lyα Damping Wings in High-z Galaxy Spectra to Measure the Intergalactic Neutral Hydrogen Fraction

The Astrophysical Journal
The Ly α damping wing is seen in absorption against the spectra of high-redshift galaxies. Modeling of this wing is a way to measure the volume neutral hydrogen fraction of the Universe, as well as to measure the strength of H i absorption in the form of
Mason Huberty, Claudia Scarlata, Matthew J. Hayes, Simon Gazagnes   +3 more
doaj   +1 more source

On the Formation of Star-forming Galaxies Having Anomalously Low-metallicity Regions: The Role of Galaxy Interaction and Circumgalactic Medium/Intergalactic Medium Accretion

The Astrophysical Journal
Gas accretion from both the circumgalactic medium (CGM)/intergalactic medium (IGM) and interacting companion galaxy can dilute the gas phase metallicity of a galaxy. However, their relative contribution to the chemical evolution of galaxies remains to be
Yibo Cao, Zhizheng Pan
doaj   +1 more source