Far-infrared observations of a star-forming region in the Corona Australis dark cloud

1984 ◽  
Vol 279 ◽  
pp. 679 ◽  
Author(s):  
I. Cruz-Gonzalez ◽  
B. McBreen ◽  
G. G. Fazio
Keyword(s):  
Far Infrared ◽  
Dark Cloud ◽  
Infrared Observations ◽  
Star Forming

scholarly journals Magnetic Fields in Strongly Interacting Galaxy Systems

2004 ◽  
Vol 217 ◽  
pp. 436-438
Author(s):  
Krzysztof T. Chyży ◽  
Rainer Beck
Keyword(s):  
Magnetic Fields ◽  
Far Infrared ◽  
Total Power ◽  
X Rays ◽  
Dark Cloud ◽  
Star Forming ◽  
Dark Clouds ◽  
Extended Radio ◽  
Tidal Tails ◽  
Cloud Complex

We obtained VLA radio total power and polarization maps of a merging pair of galaxies NGC4038/39. The whole system is filled with bright extended radio emission with a high thermal fraction of ⋍ 50% at 10.45 GHz and very strong magnetic fields of ⋍ 20μG. A star-forming region at the southern end of the dark cloud complex extending between the galaxies has highly tangled magnetic fields reaching the strength of ⋍ 30μG, even larger than in both individual galaxies. The polarized components associated with the HI ridge at the base of one of the tidal tails and with the northern complex of dark clouds (weakly forming stars) have been identified. A relic magnetic spiral coincident with the northern galaxy has been found, too. Our data on the magnetic fields combined with those in HI, Hα, X-rays and in far infrared are used as a diagnostic tool to distinguish several physically distinct regions.

scholarly journals First Detection of 661 GHz 13CO J=6 →5: Large Amounts of Warm Molecular Gas

1991 ◽  
Vol 147 ◽  
pp. 424-426
Author(s):  
U.U. Graf ◽  
R. Genzel ◽  
A.I. Harris ◽  
R.E. Hills ◽  
A.P.G. Russell ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Lower Limit ◽  
Column Density ◽  
Far Infrared ◽  
Molecular Gas ◽  
Infrared Observations ◽  
Star Forming

Submillimeter and far-infrared observations of carbon monoxide (Jaffe, Harris, and Genzel 1987; Genzel, Poglitsch, and Stacey 1988; Schmid-Burgk et al. 1989; Boreiko, Betz, and Zmuidzinas 1989) have indicated the presence of warm, dense molecular gas near regions of recent star forming activity. Estimates based on the comparison of mid-J (submm) and high-J (far-IR) 12CO lines in M17 and S106 (Harris et al. 1987a) gave a lower limit of ≈1018 cm−2 (τ(12CO 7 →6) ≈ 1) to the CO column density of quiescent (Δv ≤ 10 km/s) gas at temperatures of at least 100 K and H2 densities of 104 to 106 cm−3. The mid-J 12CO lines are likely to be optically thick in most sources. In order to obtain a better estimate of the column densities, it is thus of great interest to observe isotopic mid-J CO lines, which are likely to be optically thin.

Far-infrared observations of star-forming regions

1981 ◽  
Vol 249 ◽  
pp. 607 ◽  
Author(s):  
A. I. Sargent ◽  
R. J. van Duinen ◽  
J. W. G. Aalders ◽  
C. V. M. Fridlund ◽  
H. L. Nordh
Keyword(s):  
Far Infrared ◽  
Infrared Observations ◽  
Star Forming ◽  
Star Forming Regions

Far‐Infrared Observations of the Galactic Star‐forming Regions Associated with IRAS 00338+6312 and RAFGL 5111

1999 ◽  
Vol 522 (1) ◽  
pp. 285-296 ◽  
Author(s):  
B. Mookerjea ◽  
S. K. Ghosh ◽  
A. D. Karnik ◽  
T. N. Rengarajan ◽  
S. N. Tandon ◽  
...  
Keyword(s):  
Far Infrared ◽  
Infrared Observations ◽  
Star Forming ◽  
Star Forming Regions

scholarly journals FAR-INFRARED OBSERVATIONS OF THE VERY LOW LUMINOSITY EMBEDDED SOURCE L1521F-IRS IN THE TAURUS STAR-FORMING REGION

2009 ◽  
Vol 696 (2) ◽  
pp. 1918-1930 ◽  
Author(s):  
Susan Terebey ◽  
Michel Fich ◽  
Alberto Noriega-Crespo ◽  
Deborah L. Padgett ◽  
Misato Fukagawa ◽  
...  
Keyword(s):  
Far Infrared ◽  
Infrared Observations ◽  
Star Forming

scholarly journals First Detection of 661 GHz 13CO J=6 →5: Large Amounts of Warm Molecular Gas

1991 ◽  
Vol 147 ◽  
pp. 424-426
Author(s):  
U.U. Graf ◽  
R. Genzel ◽  
A.I. Harris ◽  
R.E. Hills ◽  
A.P.G. Russell ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Lower Limit ◽  
Column Density ◽  
Far Infrared ◽  
Molecular Gas ◽  
Infrared Observations ◽  
Star Forming

Submillimeter and far-infrared observations of carbon monoxide (Jaffe, Harris, and Genzel 1987; Genzel, Poglitsch, and Stacey 1988; Schmid-Burgk et al. 1989; Boreiko, Betz, and Zmuidzinas 1989) have indicated the presence of warm, dense molecular gas near regions of recent star forming activity. Estimates based on the comparison of mid-J (submm) and high-J (far-IR) 12CO lines in M17 and S106 (Harris et al. 1987a) gave a lower limit of ≈1018 cm−2 (τ(12CO 7 →6) ≈ 1) to the CO column density of quiescent (Δv ≤ 10 km/s) gas at temperatures of at least 100 K and H2 densities of 104 to 106 cm−3. The mid-J 12CO lines are likely to be optically thick in most sources. In order to obtain a better estimate of the column densities, it is thus of great interest to observe isotopic mid-J CO lines, which are likely to be optically thin.

Far infrared study of the giant star forming complex W 51

2002 ◽  
Vol 4 ◽  
pp. 333-333
Author(s):  
S. K. Ghosh ◽  
D. K. Ojha ◽  
R. P. Verma
Keyword(s):  
Far Infrared ◽  
Infrared Study ◽  
Giant Star ◽  
Star Forming

Tracing young SMBHs in the dusty distant universe – a Chandra view of DOGs

2020 ◽  
Vol 15 (S359) ◽  
pp. 17-21
Author(s):  
Karín Menéndez-Delmestre ◽  
Laurie Riguccini ◽  
Ezequiel Treister
Keyword(s):  
Star Formation ◽  
Main Sequence ◽  
Far Infrared ◽  
Host Galaxy ◽  
X Ray ◽  
Star Forming ◽  
Near Ir ◽  
X Ray Imaging ◽  
Combined Use ◽  
Dusty Galaxies

AbstractThe coexistence of star formation and AGN activity has geared much attention to dusty galaxies at high redshifts, in the interest of understanding the origin of the Magorrian relation observed locally, where the mass of the stellar bulk in a galaxy appears to be tied to the mass of the underlying supermassive black hole. We exploit the combined use of far-infrared (IR) Herschel data and deep Chandra ˜160 ksec depth X-ray imaging of the COSMOS field to probe for AGN signatures in a large sample of >100 Dust-Obscured Galaxies (DOGs). Only a handful (˜20%) present individual X-ray detections pointing to the presence of significant AGN activity, while X-ray stacking analysis on the X-ray undetected DOGs points to a mix between AGN activity and star formation. Together, they are typically found on the main sequence of star-forming galaxies or below it, suggesting that they are either still undergoing significant build up of the stellar bulk or have started quenching. We find only ˜30% (6) Compton-thick AGN candidates (NH > 1024 cm–2), which is the same frequency found within other soft- and hard-X-ray selected AGN populations. This suggests that the large column densities responsible for the obscuration in Compton-thick AGNs must be nuclear and have little to do with the dust obscuration of the host galaxy. We find that DOGs identified to have an AGN share similar near-IR and mid-to-far-IR colors, independently of whether they are individually detected or not in the X-ray. The main difference between the X-ray detected and the X-ray undetected populations appears to be in their redshift distributions, with the X-ray undetected ones being typically found at larger distances. This strongly underlines the critical need for multiwavelength studies in order to obtain a more complete census of the obscured AGN population out to higher redshifts. For more details, we refer the reader to Riguccini et al. (2019).

scholarly journals Accretion and Outflow Activity in the Earliest Phases of Star-Formation: CO, Sub-mm Continuum, and Near-Infrared Observations

1997 ◽  
Vol 163 ◽  
pp. 725-726
Author(s):  
K.-W. Hodapp ◽  
E. F. Ladd
Keyword(s):  
Near Infrared ◽  
Spectral Energy Distribution ◽  
Far Infrared ◽  
Point Sources ◽  
Spectral Energy ◽  
Infrared Observations ◽  
Circumstellar Material ◽  
Dense Cores ◽  
Wavelength Radiation ◽  
Main Component

Stars in the earliest phases of their formation, i.e., those accreting the main component of their final mass, are deeply embedded within dense cores of dust and molecular material. Because of the high line-of-sight extinction and the large amount of circumstellar material, stellar emission is reprocessed by dust into long wavelength radiation, typically in the far-infrared and sub-millimeter bands. Consequently, the youngest sources are strong submillimeter continuum sources, and often undetectable as point sources in the near-infrared and optical. The most deeply embedded of these sources have been labelled “Class 0” sources by André, Ward-Thompson, & Barsony (1994), in an extension of the spectral energy distribution classification scheme first proposed by Adams, Lada, & Shu (1987).

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