Is a pyrene-like molecular ion the cause of the 4,430-Å diffuse interstellar absorption band?

Nature ◽  
1992 ◽  
Vol 358 (6381) ◽  
pp. 42-43 ◽  
Author(s):  
F. Salama ◽  
L. J. Allamandola
Keyword(s):  
Absorption Band ◽  
Interstellar Absorption ◽  
Molecular Ion

Ultrafine Structure in the λ5797 Diffuse Interstellar Absorption Band

1998 ◽  
Vol 495 (2) ◽  
pp. 941-945 ◽  
Author(s):  
T. H. Kerr ◽  
R. E. Hibbins ◽  
S. J. Fossey ◽  
J. R. Miles ◽  
P. J. Sarre
Keyword(s):  
Absorption Band ◽  
Interstellar Absorption ◽  
Ultrafine Structure

scholarly journals The λ6614 diffuse interstellar absorption band: evidence for internal excitation of the carrier

2015 ◽  
Vol 453 (4) ◽  
pp. 3913-3918 ◽  
Author(s):  
Charlotte C. M. Marshall ◽  
Jacek Krełowski ◽  
Peter J. Sarre
Keyword(s):  
Absorption Band ◽  
Interstellar Absorption ◽  
Internal Excitation

The Effects of Ion Irradiation on the Evolution of the Carrier of the 3.4 Micron Interstellar Absorption Band

2003 ◽  
Vol 587 (2) ◽  
pp. 727-738 ◽  
Author(s):  
V. Mennella ◽  
G. A. Baratta ◽  
A. Esposito ◽  
G. Ferini ◽  
Y. J. Pendleton
Keyword(s):  
Absorption Band ◽  
Ion Irradiation ◽  
Interstellar Absorption

Possible Identification of the Diffuse Interstellar Absorption Band at 4430 Å

Nature ◽  
1969 ◽  
Vol 224 (5221) ◽  
pp. 785-787 ◽  
Author(s):  
W. W. DULEY ◽  
W. R. M. GRAHAM
Keyword(s):  
Absorption Band ◽  
Interstellar Absorption

scholarly journals Galactic extinction laws: II. Hidden in plain sight, a new interstellar absorption band at 7700 Å broader than any known DIB

2020 ◽  
Author(s):  
J Maíz Apellániz ◽  
R H Barbá ◽  
J A Caballero ◽  
R C Bohlin ◽  
C Fariña
Keyword(s):  
Absorption Band ◽  
General Model ◽  
Molecular Clouds ◽  
Red Giants ◽  
Optical Range ◽  
Interstellar Absorption ◽  
Ob Stars ◽  
Diffuse Interstellar Bands ◽  
The Relationship ◽  
Intermediate Density

Abstract We have detected a broad interstellar absorption band centred close to 7700 Å and with a FWHM of 176.6±3.9 Å. This is the first such absorption band detected in the optical range and is significantly wider than the numerous diffuse interstellar bands (DIBs). It remained undiscovered until now because it is partially hidden behind the A telluric band produced by O2. The band was discovered using STIS@HST spectra and later detected in a large sample of stars of diverse type (OB stars, BA supergiants, red giants) using further STIS and ground-based spectroscopy. The EW of the band is measured and compared with our extinction and K i λλ7667.021,7701.093 measurements for the same sample. The carrier is ubiquitous in the diffuse and translucent Galactic ISM but is depleted in the environment around OB stars. In particular, it appears to be absent or nearly so in sightlines rich in molecular carbon. This behaviour is similar to that of the σ-type DIBs, which originate in the low/intermediate-density UV-exposed ISM but are depleted in the high-density UV-shielded molecular clouds. We also present an update on our previous work on the relationship between E(4405 − 5495) and R5495 and incorporate our results into a general model of the ISM.

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