2. Creation revealed

2021 ◽  
pp. 14-30
Author(s):  
Raymond T. Pierrehumbert
Keyword(s):  
Nineteenth Century ◽  
Visible Light ◽  
Planetary Systems ◽  
Blackbody Radiation ◽  
Infrared Astronomy ◽  
Young Stellar Objects ◽  
Stellar Objects ◽  
Infrared Observations ◽  
Electricity And Magnetism ◽  
The Universe

‘Creation revealed’ examines key observations on planetary systems. Astronomers at first could probe the Universe only through the medium of visible light. In the early 1600s, the invention of the telescope allowed the Universe to be observed in much greater detail. With the discovery of ‘heat rays’, the seeds of infrared astronomy were planted. Meanwhile, throughout the course of the nineteenth century, one of the grandest unifications in physics was accomplished. It was discovered that the forces of electricity and magnetism were in fact different aspects of the same phenomenon: electromagnetism. Other important topics include blackbody radiation; infrared observations of young stellar objects; and the Atacama Large Millimeter/Submillimeter Array (ALMA).

scholarly journals NON-THERMAL EMISSION FROM GALACTIC JETS

2012 ◽  
Vol 08 ◽  
pp. 84-95
Author(s):  
VALENTÍ BOSCH-RAMON
Keyword(s):  
Gamma Ray ◽  
Thermal Emission ◽  
Galactic Nuclei ◽  
High Energy ◽  
Young Stellar Objects ◽  
Stellar Objects ◽  
Thermal Emitters ◽  
Thermal Sources ◽  
High Energy Emission ◽  
The Universe

Jets are ubiquitous in the Universe. They are collimated outflows whose origin is associated to an accretion disc and a central object, and can be very powerful non-thermal emitters. Jets form in active galactic nuclei, gamma-ray bursts, microquasars, and young stellar objects. Galactic jets emitting non-thermal emission are typically associated to microquasars, although the jets of massive young stellar objects are also non-thermal sources. The production of non-thermal radiation, in particular radio synchrotron emission, is a clear indication that particle acceleration is taking place in the source, which hints to the generation of photons even at high energies. In this work, we will discuss the emitting sites in, or related to, microquasar jets, and briefly comment on the possibility of high-energy emission in jets from young stellar objects.

Modeling far-infrared observations of young stellar objects

1995 ◽  
Vol 224 (1-2) ◽  
pp. 77-80 ◽  
Author(s):  
H. M. Butner ◽  
G. H. Moriarty-Schieven ◽  
M. E. Ressler ◽  
M. W. Werner
Keyword(s):  
Far Infrared ◽  
Young Stellar Objects ◽  
Stellar Objects ◽  
Infrared Observations

scholarly journals Triggered star formation in a cometary atomic/molecular cloud in the Cep OB3 association

2019 ◽  
Vol 489 (4) ◽  
pp. 4809-4816 ◽  
Author(s):  
Brandon Marshall ◽  
C R Kerton
Keyword(s):  
Star Formation ◽  
Galactic Plane ◽  
Initial Conditions ◽  
Young Stellar Objects ◽  
Wide Field ◽  
Infrared Source ◽  
Stellar Objects ◽  
Iras Source ◽  
Infrared Observations ◽  
Infrared Survey

ABSTRACT We present a study of a small atomic/molecular cometary cloud associated with the infrared source IRAS 23153+6938. The cloud is located 70 pc from the massive O-type stars in the Cepheus OB3 association, and is very likely an excellent example of triggered star formation via radiation-driven implosion (RDI). The cloud was studied using $\rm{H\,\small{I}}$ and 12CO data from the Canadian Galactic Plane Survey (CGPS) and infrared observations from the Wide-field Infrared Survey Explorer (WISE) telescope. The molecular mass is approximately MH2 = 350 ± 45 M$\odot$, and we find that the single IRAS source is actually the centre of a small cluster of class I and class II young stellar objects (YSOs). To compare with theory, we make reasonable estimates for the cometary cloud’s initial conditions and find that the cloud is located within the correct theoretical phase space for RDI to occur. In addition, both the morphology of the cloud and the location of different YSO classes relative to the cloud match what would be expected for RDI. We conclude that RDI is the most likely explanation for star formation within the cloud, and we suggest that similar studies of molecular clouds associated with nearby OB associations may be able to identify comparable examples.

scholarly journals On the Number of Galactic Planetary Systems

1985 ◽  
Vol 112 ◽  
pp. 51-58
Author(s):  
Steven Beckwith
Keyword(s):  
Planet Formation ◽  
Planetary Systems ◽  
Young Stellar Objects ◽  
Solar Mass ◽  
Stellar Objects ◽  
The Galaxy

The discoveries of small particulate clouds surrounding several young stellar objects may be the first direct indications of ongoing planet formation in the Galaxy. If these clouds are indeed the initial stages of new planetary systems around the stars, then planetary systems are probably not rare occurrences around stars and may even be quite common. The evidence for these clouds and their interpretation as young planetary systems is reviewed and discussed in the context of estimating the probability for planet formation around solar-mass stars.

High-Resolution Mid-Infrared Observations of Very Young Stellar Objects in NGC 1333

2003 ◽  
Vol 125 (5) ◽  
pp. 2568-2583 ◽  
Author(s):  
L. M. Rebull ◽  
D. M. Cole ◽  
K. R. Stapelfeldt ◽  
M. W. Werner
Keyword(s):  
High Resolution ◽  
Young Stellar Objects ◽  
Stellar Objects ◽  
Mid Infrared ◽  
Infrared Observations

Modeling Far-Infrared Observations of Young Stellar Objects

1995 ◽  
pp. 77-80 ◽  
Author(s):  
H. M. Butner ◽  
G. H. Moriarty-Schieven ◽  
M. E. Ressler ◽  
M. W. Werner
Keyword(s):  
Far Infrared ◽  
Young Stellar Objects ◽  
Stellar Objects ◽  
Infrared Observations
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