Bioenergetics and stellar luminosities

2017 ◽  
Vol 18 (3) ◽  
pp. 211-212
Author(s):  
C Sivaram ◽  
K Arun ◽  
O V Kiren
Keyword(s):  
Metabolic Rate ◽  
Unit Mass ◽  
Infrared Galaxies ◽  
X Ray ◽  
Luminous Infrared Galaxies ◽  
Maximal Metabolic Rate ◽  
Luminous Objects ◽  
The Universe

AbstractWe draw attention to a curious coincidence wherein the most (steadily emitting) luminous objects in the Universe from stellar X-ray sources to ultra-luminous quasars and Ultra Luminous Infrared Galaxies, steadily emit a power per unit mass, which is just the same value as the maximal metabolic rate in (warm-blooded) bio-organisms.

scholarly journals Luminous IR Galaxies: Evolution and Molecular Gas

1997 ◽  
Vol 159 ◽  
pp. 439-440 ◽  
Author(s):  
Yu Gao
Keyword(s):  
Molecular Gas ◽  
Infrared Galaxies ◽  
Galaxy Interactions ◽  
Merging Galaxies ◽  
Star Forming ◽  
Luminous Infrared Galaxies ◽  
Star Forming Regions ◽  
Ir Sources ◽  
Order Of Magnitude ◽  
The Universe

Luminous infrared galaxies (LIRGs), denned by the criterion LIR ≳ 2 × 1011L⊙ (for H0=75 kms−1 Mpc−1), are the most powerful IR sources in the Universe, with most of their emission (~ 90%) in the far-IR. Most LIRGs are interacting/merging galaxies with large amounts of molecular gas as revealed by CO surveys (Sanders et al. 1991; Solomon et al. 1996). However, whether starbursts or dust-enshrouded AGNs/QSOs dominate the IR luminosity is not resolved.CO may not trace the active star-forming regions where gas density is more than one order of magnitude higher than the average. Dense molecular gas is better traced by high dipole-moment molecules like HCN and CS (e.g., Nguyen-Q-Rieu et al. 1992; Gao & Solomon 1996). Therefore, it is essential to survey HCN emission in a large sample of LIRGs to better reveal the nature of LIRGs. We here study IR and molecular gas properties vs. galaxy-galaxy interactions in LIRGs over various merging phases to trace their evolution and explore some links among interactions, starbursts, and AGN phenomena.

scholarly journals Infrared Surveys for AGN

2002 ◽  
Vol 184 ◽  
pp. 157-166
Author(s):  
Harding E. Smith
Keyword(s):  
Large Scale ◽  
High Redshift ◽  
Infrared Galaxies ◽  
X Ray ◽  
Luminous Infrared Galaxies ◽  
Infrared Studies ◽  
Infrared Background ◽  
Infrared Surveys ◽  
Infrared Sources ◽  
Review Current

AbstractFrom the earliest extragalactic infrared studies AGN have shown themselves to be strong infrared sources, and IR surveys have revealed new populations of AGN. I briefly review current motivations for AGN surveys in the infrared and results from previous IR surveys. The Luminous Infrared Galaxies, which in some cases house dust-enshrouded AGN, submillimeter surveys, and recent studies of the cosmic x-ray and infrared backgrounds suggest that there is a population of highly-obscured AGN at high redshift. ISO Surveys have begun to resolve the infrared background and may have detected this obscured AGN population. New infrared surveys, particularly the SIRTF Wide-area Infrared Extragalactic Legacy Survey (SWIRE) will detect this population and provide a platform for understanding the evolution of AGN, Starbursts and passively evolving galaxies in the context of large-scale structure and environment.

An X-ray study of luminous infrared galaxies observed with ASCA

1999 ◽  
Vol 23 (5-6) ◽  
pp. 1051-1055 ◽  
Author(s):  
K Misaki ◽  
K Iwasawa ◽  
Y Taniguchi ◽  
Y Terashima ◽  
H Kunieda ◽  
...  
Keyword(s):  
Infrared Galaxies ◽  
X Ray ◽  
Luminous Infrared Galaxies

scholarly journals ASCA Observations of Luminous Infrared Starburst Galaxies

1999 ◽  
Vol 186 ◽  
pp. 287-287
Author(s):  
H. Watarai ◽  
K. Misaki ◽  
Y. Terashima ◽  
T. Nakagawa
Keyword(s):  
Strong Evidence ◽  
Starburst Galaxies ◽  
Infrared Galaxies ◽  
X Ray ◽  
Luminous Infrared Galaxies ◽  
Astronomical Satellite

We present recent results of X-ray observations of two luminous infrared galaxies, NGC3690+IC694 (Arp299) and NGC1614 obtained by the Japanese X-ray astronomical satellite ASCA. Both galaxies have quite high infrared luminosity (> 1011L⊙) and strong evidence of merger.

X-ray Astronomy and the IR Background

2001 ◽  
Vol 204 ◽  
pp. 335-345
Author(s):  
Richard Mushotzky
Keyword(s):  
Star Formation ◽  
Intergalactic Medium ◽  
Massive Stars ◽  
Active Galaxies ◽  
Infrared Galaxies ◽  
Metal Production ◽  
X Ray ◽  
Luminous Infrared Galaxies ◽  
Early Origin ◽  
X Ray Background

I review the recent Chandra results on the sources of the X-ray background and the X-ray properties of the SCUBA sources. We conclude that 10–20% of the IR background is produced by active galaxies and a similar fraction of the SCUBA sources harbor luminous AGN. Many of the Chandra sources are apparently luminous infrared galaxies themselves, but factors of 2–10 below the SCUBA limits. We summarize the X-ray evidence for metal production in groups and clusters and point out that these data require considerably more star formation than inferred from optical stellar data. The abundance ratios of Fe and Si indicate that much of the metals in groups and clusters was produced by massive stars, and the lack of evolution in Fe out to z ~ 0.5 argues for quite an early origin for the metals. This same process also seems to have injected considerable energy into the gas in groups and clusters, which may have dominated the mechanism of star formation and produced a metal-enriched intergalactic medium

A Dust-Enshrouded Tidal Disruption Event in a Luminous Infared Galaxy

2017 ◽  
Vol 14 (S339) ◽  
pp. 65-65
Author(s):  
S. Mattila
Keyword(s):  
Near Infrared ◽  
Infrared Galaxies ◽  
Tidal Disruption ◽  
Local Universe ◽  
X Ray ◽  
Luminous Infrared Galaxies ◽  
Supermassive Black Hole ◽  
Infrared Wavelengths ◽  
Infrared Monitoring ◽  
Disruption Event

AbstractThis paper presented the discovery of an energetic nuclear transient from near-infrared monitoring of nearby starburst and luminous infrared galaxies. The transient radiated at least 1.5E+52 erg in the infrared but remained elusive at optical and X-ray wavelengths. We interpret its properties as arising from a stellar tidal disruption event (TDE) close to a supermassive black hole. Much of its emission must have been reprocessed by dense gas and re-radiated at infrared wavelengths by dust, suggesting a way for reducing the tension between theoretical luminosity predictions and observations of TDEs. Such events are not detectable by optical, UV or soft X-ray observations, and might represent just the tip of the iceberg of a missed TDE population in the local Universe. That population could be more numerous at higher redshifts where luminous infrared galaxies are more common.

scholarly journals High angular resolution radio and infrared view of optically dark supernovae in luminous infrared galaxies

2016 ◽  
Vol 12 (S329) ◽  
pp. 332-336
Author(s):  
Seppo Mattila ◽  
Erkki Kankare ◽  
Erik Kool ◽  
Cristina Romero-Cañizales ◽  
Stuart Ryder ◽  
...  
Keyword(s):  
Interstellar Dust ◽  
Angular Resolution ◽  
Formation Rate ◽  
High Angular Resolution ◽  
Infrared Galaxies ◽  
Luminous Infrared Galaxies ◽  
Ultraluminous Infrared Galaxies ◽  
Central Regions ◽  
Nuclear Regions ◽  
The Universe

AbstractIn luminous and ultraluminous infrared galaxies (U/LIRGs), the infall of gas into the central regions strongly enhances the star formation rate (SFR), especially within the nuclear regions which have also large amounts of interstellar dust. Within these regions SFRs of several tens to hundreds of solar masses per year ought to give rise to core-collapse supernova (SN) rates up to 1-2 SNe every year per galaxy. However, the current SN surveys, almost exclusively being ground-based seeing-limited and working at optical wavelengths, have been blinded by the interstellar dust and contrast issues therein. Thus the properties and rates of SNe in the nuclear environments of the most prolific SN factories in the Universe have remained largely unexplored. Here, we present results from high angular resolution observations of nearby LIRGs at infrared and radio wavelengths much less affected by the effects of extinction and lack of resolution hampering the optical searches.

scholarly journals Nature of Compton-thick Active Galactic Nuclei in “Nonmerging” Luminous Infrared Galaxies UGC 2608 and NGC 5135 Revealed with Broadband X-Ray Spectroscopy

2020 ◽  
Vol 897 (1) ◽  
pp. 107
Author(s):  
Satoshi Yamada ◽  
Yoshihiro Ueda ◽  
Atsushi Tanimoto ◽  
Saeko Oda ◽  
Masatoshi Imanishi ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Infrared Galaxies ◽  
X Ray ◽  
Luminous Infrared Galaxies
Sign in / Sign up

Export Citation Format

Share Document