scholarly journals The Mid‐Infrared Colors of the Interstellar Medium and Extended Sources at the Galactic Center

2008 ◽  
Vol 682 (1) ◽  
pp. 384-399 ◽  
Author(s):  
R. G. Arendt ◽  
S. R. Stolovy ◽  
S. V. Ramírez ◽  
K. Sellgren ◽  
A. S. Cotera ◽  
...  
Keyword(s):  
Interstellar Medium ◽  
Galactic Center ◽  
Mid Infrared ◽  
Extended Sources

Kinematical Structure of the Local Interstellar Medium: The Galactic Center Hemisphere

1997 ◽  
Vol 484 (2) ◽  
pp. 761-778 ◽  
Author(s):  
Ricardo Genova ◽  
John E. Beckman ◽  
Stuart Bowyer ◽  
Thomas Spicer
Keyword(s):  
Interstellar Medium ◽  
Galactic Center ◽  
Local Interstellar Medium

scholarly journals The First Mid-infrared Detection of HNC in the Interstellar Medium: Probing the Extreme Environment toward the Orion Hot Core

2021 ◽  
Vol 907 (1) ◽  
pp. 51
Author(s):  
Sarah Nickerson ◽  
Naseem Rangwala ◽  
Sean W. J. Colgan ◽  
Curtis DeWitt ◽  
Xinchuan Huang ◽  
...  
Keyword(s):  
Interstellar Medium ◽  
Extreme Environment ◽  
Infrared Detection ◽  
Mid Infrared

The Hot Interstellar Medium of the Galactic Center: Observations with Chandra

1997 ◽  
pp. 281-285 ◽  
Author(s):  
M. Morris ◽  
C. Howard ◽  
M. Muno ◽  
F. K. Baganoff ◽  
S. Park ◽  
...  
Keyword(s):  
Interstellar Medium ◽  
Galactic Center

scholarly journals Polyaromatic disordered carbon grains as carriers of the UV bump: Far-UV to mid-IR spectroscopy of laboratory analogs

2017 ◽  
Vol 607 ◽  
pp. A73 ◽  
Author(s):  
L. Gavilan ◽  
K. C. Le ◽  
T. Pino ◽  
I. Alata ◽  
A. Giuliani ◽  
...  
Keyword(s):  
Interstellar Medium ◽  
Interstellar Dust ◽  
Vacuum Ultraviolet ◽  
Interstellar Extinction ◽  
Electronic Transitions ◽  
Mid Infrared ◽  
Pressure Experiment ◽  
Circumstellar Extinction ◽  
Integrated Intensities ◽  
Far Ultraviolet

Context. A multiwavelength study of laboratory carbons with varying degrees of hydrogenation and sp2 hybridization is required to characterize the structure of the carbonaceous carriers of interstellar and circumstellar extinction. Aims. We study the spectral properties of carbonaceous dust analogs from the far-ultraviolet to the mid-infrared and correlate features in both spectral ranges to the aromatic/aliphatic degree. Methods. Analogs to carbonaceous interstellar dust encountered in various phases of the interstellar medium have been prepared in the laboratory. These are amorphous hydrogenated carbons (a-C:H), analogs to the diffuse interstellar medium component, and soot particles, analogs to the polyaromatic component. Thin films (d < 100 nm) have been measured in transmission in the vacuum-ultraviolet (VUV; 120–210 nm) within the atmospheric pressure experiment (APEX) chamber of the DISCO beam line at the SOLEIL synchrotron radiation facility. Spectra of these films were further measured through the UV-Vis (210 nm–1 μm) and in the mid-infrared (3–15 μm). Results. Tauc optical gaps, Eg, are derived from the visible spectra. The major spectral features are fitted through the VUV to the mid-infrared to obtain positions, full-widths at half maximum (FWHM), and integrated intensities. These are plotted against the position of the π-π∗ electronic transitions peak. Unidentified or overlapping features in the UV are identified by correlations with complementary infrared data. A correlation between the optical gap and position of the π-π∗ electronic transitions peak is found. The latter is also correlated to the position of the sp3 carbon defect band at ~8 μm, the aromatic C=C stretching mode position at ~6 μm, and the H/C ratio. Conclusions. Ultraviolet and infrared spectroscopy of structurally diverse carbon samples are used to constrain the nanostructural properties of carbon carriers of both circumstellar and interstellar extinction, such as the associated coherent lengths and the size of polyaromatic units. Our study suggests that carriers of the interstellar UV bump should exhibit infrared bands akin to the A/B classes of the aromatic infrared bands, while the circumstellar bump carriers should exhibit bands corresponding to the B/C classes.

scholarly journals Mid-Infrared (4.8–12.4 and 20.0 μm) Imaging of the Galactic Center: Modeling the Dust Emission and Energetics of the Central Parsec

1996 ◽  
Vol 169 ◽  
pp. 231-240 ◽  
Author(s):  
Dan Gezari ◽  
Eli Dwek ◽  
Frank Varosi
Keyword(s):  
Galactic Center ◽  
Dust Emission ◽  
Infrared Emission ◽  
Mid Infrared ◽  
New Model ◽  
Central Engine ◽  
Direct Indication ◽  
Sgr A ◽  
Central Parsec ◽  
Array Camera

We have modeled the mid-infrared emission from the Galactic Center using our array camera images at eight wavelengths. The results suggest that the high infrared luminosity of the region is provided by a cluster of luminous stars. There is no direct indication in the new model results of a very luminous object or “central engine” near Sgr A∗.

scholarly journals ISO observations of the Galactic center interstellar medium

2005 ◽  
Vol 429 (3) ◽  
pp. 923-938 ◽  
Author(s):  
N. J. Rodríguez-Fernández ◽  
J. Martín-Pintado
Keyword(s):  
Interstellar Medium ◽  
Galactic Center

scholarly journals A Molecular Line Investigation of the Interaction between Mid-infrared Bubbles and the Interstellar Medium

2018 ◽  
Vol 861 (2) ◽  
pp. 117 ◽  
Author(s):  
Kathryn Devine ◽  
Johanna Mori ◽  
Christer Watson ◽  
Leonardo Trujillo ◽  
Matthew Hicks
Keyword(s):  
Interstellar Medium ◽  
Molecular Line ◽  
Mid Infrared

scholarly journals 1.16. 4.5 to 11.7 microns spectrophotometric observations of the Galactic bulge by the MIRS/IRTS

1998 ◽  
Vol 184 ◽  
pp. 47-47
Author(s):  
Kin-Wing Chan ◽  
T. L. Roellig ◽  
T. Onaka ◽  
I. Yamamura ◽  
T. Tanabé
Keyword(s):  
Interstellar Medium ◽  
Mass Loss Rate ◽  
Life Time ◽  
High Mass ◽  
Galactic Latitude ◽  
Galactic Bulge ◽  
Stellar Content ◽  
Mid Infrared ◽  
Evolved Stars ◽  
Infrared Background

Using the Mid-Infrared (MIRS) on board the Infrared Telescope in Space (IRTS) we obtained the 4.5 to 11.7 μm spectra of the stellar populations and diffuse interstellar medium in the Galactic bulge (l ≈ 8.7°, b ≈ 2.9, 4.0, 4.7, and 5.7°). Below galactic latitute of 4.0° the mid-infrared background spectra in the bulge are similar to the spectrum of M and K giants. The UIR bands (6.2, 7.7, 8.6, and 11.3 μm) are also detected in these regions and they are likely arising from the diffuse interstellar medium in the bulge. Above galactic latitude of 4.0°, the mid-infrared background spectra are similar to the spectrum of those evolved stars with high mass-loss rate detected by IRAS. One likely interpretation is that this background emission arises predominantly from these stars with very low luminosities that have not been detected by IRAS. The main-sequence life time for such low luminosity evolved stars is at least 10 Gyr, even in the metal poor cases. If these low luminosity evolved stars are metal-rich then the age would be much older. Thus, the existence of a large number (~ 75) of such low luminosity evolved stars in a small region (8′ × 8′) in the bulge would have significant impact on our understanding of the stellar content and the age of the Galactic bulge.

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