scholarly journals VLBI OH maser polarimetry with the Australian Long Baseline Array: the star-forming region G340.054–0.244

2007 ◽  
Vol 3 (S242) ◽  
pp. 64-65
Author(s):  
I. Bains ◽  
J. Caswell ◽  
A. M. S. Richards ◽  
C. Phillips ◽  
S. Tingay ◽  
...  
Keyword(s):  
Spectral Line ◽  
Spatial Resolution ◽  
Radio Astronomy ◽  
High Velocity ◽  
High Spatial Resolution ◽  
Polarimetric Observation ◽  
Polarization Structure ◽  
Star Forming ◽  
Long Baseline ◽  
The Subject

AbstractUntil recently, high spatial resolution full Stokes maser polarimetry was the sole domain of northern interferometers and a wealth of sources in the far south remained unexplored due to a lack of suitable instrumentation having both high spatial and high velocity resolution. The Australia Telescope Long Baseline Array (LBA) has now switched to disk-based software correlation, permitting full Stokes observing in spectral line mode with velocity channels which are sufficiently narrow to sample usefully the polarization structure. To illustrate the utility of this valuable addition to radio astronomy, we present preliminary results of the first such polarimetric observation, the subject of which are the OH masers in the star-forming region G340.054–0.244.

scholarly journals A High Spatial Resolution X‐Ray and Hα Study of Hot Gas in the Halos of Star‐forming Disk Galaxies. II. Quantifying Supernova Feedback

2004 ◽  
Vol 606 (2) ◽  
pp. 829-852 ◽  
Author(s):  
David K. Strickland ◽  
Timothy M. Heckman ◽  
Edward J. M. Colbert ◽  
Charles G. Hoopes ◽  
Kimberly A. Weaver
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Disk Galaxies ◽  
X Ray ◽  
Star Forming ◽  
Hot Gas ◽  
Supernova Feedback

scholarly journals Revealing the true face of the behemoths

2015 ◽  
Vol 11 (A29B) ◽  
pp. 464-466
Author(s):  
Keiichi Ohnaka
Keyword(s):  
High Resolution ◽  
Mass Loss ◽  
Spatial Resolution ◽  
Recent Progress ◽  
High Spatial Resolution ◽  
Acceleration Region ◽  
Long Baseline ◽  
Red Supergiants ◽  
High Resolution Images ◽  
Resolution Imaging

AbstractTo improve our understanding of the mass loss in red supergiants (RSGs), it is of paramount importance to observe the wind acceleration region close to the star with high spatial resolution. I review the recent progress in milliarcsecond-resolution imaging of the surface and atmosphere of RSGs with optical and infrared long-baseline interferometers. The high resolution images of RSGs have revealed the true face of these behemoths, which have turned out to be very complex.

scholarly journals High Spatial Resolution Near-IR Tip/Tilt Imaging of “Warm” Ultraluminous Infrared Galaxies

1999 ◽  
Vol 186 ◽  
pp. 363-363
Author(s):  
J.A. Surace ◽  
D.B. Sanders
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Compact Star ◽  
Dust Emission ◽  
Host Galaxies ◽  
Infrared Galaxies ◽  
Star Forming ◽  
Compact Source ◽  
Near Ir ◽  
Ultraluminous Infrared Galaxies

We present results from high spatial resolution (FWHM ≈ 0.3–0.5″) near-IR (1.6 and 2.1μm) imaging of a complete sample of ultraluminous infrared galaxies (ULIGs) chosen to have “warm” mid-IR colors (f25/f60 > 0.2) characteristic of AGN. In conjunction with our WFPC2 imaging program (Surace et al. 1998), we have found that nearly all of these systems are advanced mergers with complex nuclear morphologies. The extended underlying galaxies are detected in each system at H and K′, and are found to have luminosities of a few L∗, similar to quasars (McLeod & Rieke 1994). Many of the circumnuclear star-forming knots seen at optical wavelengths have been detected. Based on model SEDs, their bolometric luminosities appear similar to those of the extended nuclear starbursts seen in other, less-luminous interacting systems (i.e. NGC 4038/9). Each ULIG is increasingly dominated at long wavelengths by a compact source which we identify as a putative active nucleus. The optical/near-IR colors of these putative nuclei are more extreme than the most infrared-active starburst galaxies, yet are identical to “far-IR loud” quasars which are in turn similar to optical quasars with significant hot (800 K) dust emission. Half of the ULIGs have dereddened nuclear near-IR luminosities comparable to those of QSOs, while the others resemble Seyferts; this may be an effect of patchy extinction and scattering. Similarities between the putative ULIG nuclei and QSO nuclei, the underlying host galaxies, and the apparent young age of the ULIGs (as evidenced by their compact star-forming knots) support the evolution of “warm” ULIGs into optical QSOs.

scholarly journals Resolving the mass loss from red supergiants by high angular resolution

2016 ◽  
Vol 12 (S329) ◽  
pp. 97-103
Author(s):  
Keiichi Ohnaka
Keyword(s):  
Mass Loss ◽  
Spatial Resolution ◽  
Angular Resolution ◽  
High Spatial Resolution ◽  
Spatial Scales ◽  
High Angular Resolution ◽  
Circumstellar Envelope ◽  
Long Baseline ◽  
Red Supergiants ◽  
Late Stages

AbstractDespite its importance on late stages of the evolution of massive stars, the mass loss from red supergiants (RSGs) is a long-standing problem. To tackle this problem, it is essential to observe the wind acceleration region close to the star with high spatial resolution. While the mass loss from RSGs is often assumed to be spherically symmetric with a monotonically accelerating wind, there is mounting observational evidence that the reality is much more complex. I review the recent progress in high spatial resolution observations of RSGs, encompassing from the circumstellar envelope on rather large spatial scales (~100 stellar radii) to milliarcsecond-resolution aperture-synthesis imaging of the surface and the atmosphere of RSGs with optical and infrared long-baseline interferometers.

scholarly journals Activity in Near-Normal Galaxies

1987 ◽  
Vol 121 ◽  
pp. 461-468
Author(s):  
Vera C. Rubin
Keyword(s):  
Spatial Resolution ◽  
High Velocity ◽  
High Spatial Resolution ◽  
Low Light ◽  
High Velocity Resolution ◽  
Normal Galaxies ◽  
Light Levels ◽  
Very High Spatial Resolution ◽  
Very High

Modern detectors permit astronomers to examine galaxies at very low light levels, at very high velocity resolution, and for nearby objects, at very high spatial resolution. Such observations will lead to phenomenon not previously detected, and offer new insights into the phenomena we presently lump under the heading of “activity.”

scholarly journals Spiral Galaxy in 3D as Seen with SpIOMM

2014 ◽  
Vol 10 (S309) ◽  
pp. 340-340
Author(s):  
Laurie Rousseau-Nepton ◽  
Carmelle Robert ◽  
Laurent Drissen
Keyword(s):  
Fourier Transform ◽  
Spatial Resolution ◽  
Spiral Galaxy ◽  
Spiral Galaxies ◽  
High Spatial Resolution ◽  
Large Database ◽  
Star Forming ◽  
Star Forming Regions ◽  
Warm Ionized Medium

AbstractUsing the imaging Fourier transform spectrograph (FTS) SpIOMM we study 7 nearby spiral galaxies. The large database of spectra obtained around Hα and Hβ is ideal to study the star forming regions and warm ionized medium (WIM) with a high spatial resolution (∼ 50-150 pc).

A High Spatial Resolution Study of the ON2 Massive Star‐forming Region

1997 ◽  
Vol 482 (1) ◽  
pp. 355-371 ◽  
Author(s):  
D. S. Shepherd ◽  
E. Churchwell ◽  
D. J. Wilner
Keyword(s):  
Spatial Resolution ◽  
Massive Star ◽  
High Spatial Resolution ◽  
Star Forming ◽  
Resolution Study

scholarly journals A High Spatial Resolution X‐Ray and Hα Study of Hot Gas in the Halos of Star‐forming Disk Galaxies. I. Spatial and Spectral Properties of the Diffuse X‐Ray Emission

2004 ◽  
Vol 151 (2) ◽  
pp. 193-236 ◽  
Author(s):  
David K. Strickland ◽  
Timothy M. Heckman ◽  
Edward J. M. Colbert ◽  
Charles G. Hoopes ◽  
Kimberly A. Weaver
Keyword(s):  
Spatial Resolution ◽  
Spectral Properties ◽  
High Spatial Resolution ◽  
Disk Galaxies ◽  
X Ray ◽  
Star Forming ◽  
Hot Gas
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