compact hii regions Recently Published Documents

AbstractWe report the results of 14 years of monitoring of G188.95+0.89 periodic 6.7 GHz methanol masers using the Hartebeesthoek 26-m radio telescope. G188.95+0.89 (S252, AFGL5180) is a radio-quiet methanol maser site that is often interpreted as precursors of ultra-compact HII regions or massive protostar sites. At least five bright spectral components were identified. The maser feature at 11.36 km s-1 was found to experience an exponential decay during the monitoring period. The millimetre continuum reveals two cores associated with the source.

Modeling and predicting the shape of the far-infrared to submillimeter emission in ultra-compact HII regions and cold clumps

10.1051/0004-6361/201322566 ◽

2014 ◽

Vol 572 ◽

pp. A37 ◽

Cited By ~ 5

Author(s):

D. Paradis ◽

C. Mény ◽

A. Noriega-Crespo ◽

R. Paladini ◽

J.-P. Bernard ◽

...

Keyword(s):

Far Infrared ◽

Hii Regions ◽

Compact Hii Regions ◽

Submillimeter Emission

The ionizing sources of luminous compact HII regions in the RCW106 and RCW122 clouds

10.1051/0004-6361/201321306 ◽

2014 ◽

Vol 563 ◽

pp. A123 ◽

Cited By ~ 3

Author(s):

J. M. C. Grave ◽

M. S. N. Kumar ◽

D. K. Ojha ◽

G. D. C. Teixeira ◽

G. Pace

Keyword(s):

Hii Regions ◽

New 20-cm radio-continuum study of the small Magellanic cloud - part III: Compact Hii regions

Serbian Astronomical Journal ◽

10.2298/saj1285053w ◽

2012 ◽

pp. 53-64 ◽

Cited By ~ 5

Author(s):

G.F. Wong ◽

M.D. Filipovic ◽

E.J. Crawford ◽

N.F.H. Tothill ◽

Horta de ◽

...

Keyword(s):

Hii Regions ◽

Magellanic Cloud ◽

Radio Continuum ◽

Spectral Indices ◽

Emission Mechanism ◽

Small Magellanic Cloud ◽

Southwestern Part ◽

Continuum Image ◽

Compact Array ◽

We present and discuss a new catalogue of 48 compact Hii regions in the Small Magellanic Cloud (SMC) and a newly created deep 1420 MHz (?=20 cm) radio-continuum image of the N19 region located in the southwestern part of the SMC. The new images were created by merging 1420 MHz radiocontinuum archival data from the Australian Telescope Compact Array. The majority of these detected radio compact Hii regions have rather flat spectral indices which indicates, as expected, that the dominant emission mechanism is of thermal nature.

PNe in NGC 300: Their abundances and chemical gradients

Proceedings of the International Astronomical Union ◽

10.1017/s1743921312011064 ◽

2011 ◽

Vol 7 (S283) ◽

pp. 263-266

Author(s):

Miiriam Peña ◽

Grazyna Stasinska ◽

Fabio Bresolin ◽

Yiannis Tsamis

Keyword(s):

Preliminary Analysis ◽

Planetary Nebulae ◽

Hii Regions ◽

Chemical Gradients ◽

Spectrophotometric Data ◽

AbstractSpectrophotometric data of a number of planetary nebulae and compact HII regions of NGC 300 have been obtained with the FORS 2 spectrograph of the VLT. We present a preliminary analysis of such data.

A millimeter survey of ultra-compact HII-regions and associated molecular clouds

10.1051/0004-6361/200912241 ◽

2010 ◽

Vol 513 ◽

pp. A9 ◽

Cited By ~ 13

Author(s):

E. Churchwell ◽

A. Sievers ◽

C. Thum

Keyword(s):

Molecular Clouds ◽

Hii Regions ◽

7 mm continuum observations of ultra compact HII regions

10.1051/0004-6361/200911894 ◽

2009 ◽

Vol 507 (3) ◽

pp. 1467-1473 ◽

Cited By ~ 7

Author(s):

P. Leto ◽

G. Umana ◽

C. Trigilio ◽

C. S. Buemi ◽

S. Dolei ◽

...

Keyword(s):

Hii Regions ◽

Infra-red observations at λ > 40 μm OF compact HII regions

H II Regions and Related Topics - Lecture Notes in Physics ◽

10.1007/3-540-07409-0_107 ◽

2008 ◽

pp. 137-155 ◽

Cited By ~ 8

Author(s):

R. E. Jennings

Keyword(s):

Hii Regions ◽

Infra Red ◽

Mapping the Galaxy and Nearby Galaxies - Astrophysics and Space Science Proceedings ◽

New Catalogs of Radio Compact HII Regions in the Milky Way

10.1007/978-0-387-72768-4_58 ◽

2008 ◽

pp. 322-322

Author(s):

Uriel Giveon ◽

R. H. Becker ◽

D. J. Helfand ◽

R. L. White ◽

M. J. Richter

Keyword(s):

Milky Way ◽

Hii Regions ◽

An OH maser flare with a strong magnetic field in W75N

Proceedings of the International Astronomical Union ◽

10.1017/s1743921307012835 ◽

2007 ◽

Vol 3 (S242) ◽

pp. 166-167

Author(s):

V. I. Slysh ◽

V. Migenes

Keyword(s):

Magnetic Field ◽

Field Strength ◽

Strong Magnetic Field ◽

Magnetic Field Strength ◽

Hii Regions ◽

Maser Emission ◽

Flare Event ◽

Order Of Magnitude ◽

AbstractA flare of OH maser emission was discovered in W75N in 2000. Its location was determined with the VLBA to be within 110 AU from one of the ultra-compact HII regions, VLA2. The flare consisted of several maser spots. Four of the spots were found to form Zeeman pairs, all of them with a magnetic field strength of about 40 mG. This is the highest ever magnetic field strength found in OH masers, an order of magnitude higher than in typical OH masers. We discuss the possible source for the enhanced magnetic field and its relation to the flare event.