Neutral and ionized polycyclic aromatic hydrocarbons, diffuse interstellar bands and the ultraviolet extinction curve

1993 ◽  
Vol 89 (13) ◽  
pp. 2277 ◽  
Author(s):  
Farid Salama ◽  
Louis John Allamandola
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Extinction Curve ◽  
Diffuse Interstellar Bands ◽  
Polycyclic Aromatic ◽  
Ultraviolet Extinction

scholarly journals Polycyclic Aromatic Hydrocarbons and the Diffuse Interstellar Bands: A Survey

1999 ◽  
Vol 526 (1) ◽  
pp. 265-273 ◽  
Author(s):  
F. Salama ◽  
G. A. Galazutdinov ◽  
J. Krełowski ◽  
L. J. Allamandola ◽  
F. A. Musaev
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Diffuse Interstellar Bands ◽  
Polycyclic Aromatic

scholarly journals POLYCYCLIC AROMATIC HYDROCARBONS AND THE DIFFUSE INTERSTELLAR BANDS: A SURVEY

2011 ◽  
Vol 728 (2) ◽  
pp. 154 ◽  
Author(s):  
F. Salama ◽  
G. A. Galazutdinov ◽  
J. Krełowski ◽  
L. Biennier ◽  
Y. Beletsky ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Diffuse Interstellar Bands ◽  
Polycyclic Aromatic

scholarly journals The well correlated diffuse interstellar bands at λλ 6196, 6614 Å and their possible companions

2020 ◽  
Vol 496 (2) ◽  
pp. 2231-2240
Author(s):  
A Bondar
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
High Resolution ◽  
Aromatic Hydrocarbons ◽  
Correlation Coefficients ◽  
High Signal ◽  
Signal To Noise ◽  
B Stars ◽  
Diffuse Interstellar Bands ◽  
Polycyclic Aromatic ◽  
First Time

ABSTRACT Considered here is the interrelation between five diffuse interstellar bands (DIBs), λλ 5545, 6113, 6196, 6445 and 6614 Å. Two DIBs (λλ 6196 and 6614 Å) are already known as being well correlated with each other; their relation with three other weaker bands is investigated for the first time. To accomplish this task, high-resolution spectra (λ/δλ ≈100 000) with high signal-to-noise ratios (S/N) of 54 hot O–B stars with reddening 0.12–1.45 mag were used. Analysis of measured equivalent widths has allowed us to establish linear dependences and evaluate linear correlation coefficients as high as 0.968–0.988 between the intensities of these five DIBs. Such a degree of correlation may indicate their common origin. Several spacings in wavenumbers found between these DIBs correspond to the energies of vibrational transitions in some polycyclic aromatic hydrocarbons resulting in IR emissions at λλ 16.4, 11.3, 7.7, 6.2 and 3.3 μm.

scholarly journals Correlation between UV resilience and wavelength of narrow diffuse interstellar bands

2020 ◽  
Vol 637 ◽  
pp. A74
Author(s):  
A. Omont ◽  
H. F. Bettinger
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Oscillator Strengths ◽  
Band Width ◽  
Carbon Chains ◽  
Diffuse Interstellar Bands ◽  
Polycyclic Aromatic

Carriers of diffuse interstellar bands (DIBs) still need to be identified. In a recent paper, we reported a correlation between the DIB wavelength and the apparent UV resilience (or boost) of their carriers. We proposed that this might be an indication of the important role of conjugated elongated molecules among the DIB carriers. The aim of this paper is to further understand the origin of this correlation. The analysis of 509 optical DIBs on the lines of sight of HD 183143 and/or HD 204827 reported in the literature shows that this correlation mainly implies the 386 narrow DIBs with a band width <1.1 Å, which include most of the identified DIBs of the C2 and ζ families, while the majority of the 123 broader DIBs, including the identified σ DIBs, do not display such a correlation. We present a possible origin of this correlation from very strong bands of large conjugated elongated molecules, such as carbon chains, polyacenes, or other catacondensed polycyclic aromatic hydrocarbons. The total amount of carbon contained in all the carriers of these narrow DIBs is a very small fraction of the interstellar carbon if their oscillator strengths are ≥1. The amount of carbon locked in the carriers of the broader DIBs is higher, especially if their oscillator strengths are significantly weaker.

scholarly journals Polycyclic Aromatic Hydrocarbons and the Extinction Curve

2020 ◽  
pp. 327-340
Author(s):  
G. Mulas ◽  
G. Malloci ◽  
C. Joblin ◽  
C. Cecchi-Pestellini
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Extinction Curve ◽  
Polycyclic Aromatic

The Role of Polycyclic Aromatic Hydrocarbons in Ultraviolet Extinction. I. Probing Small Molecular Polycyclic Aromatic Hydrocarbons

2003 ◽  
Vol 592 (2) ◽  
pp. 947-952 ◽  
Author(s):  
Geoffrey C. Clayton ◽  
Karl D. Gordon ◽  
F. Salama ◽  
L. J. Allamandola ◽  
Peter G. Martin ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Polycyclic Aromatic ◽  
Ultraviolet Extinction
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