Water Masers in Orion

1998 ◽  
Vol 493 (2) ◽  
pp. 940-949 ◽  
Author(s):  
R. A. Gaume ◽  
T. L. Wilson ◽  
F. J. Vrba ◽  
K. J. Johnston ◽  
J. Schmid‐Burgk
Keyword(s):  
Water Masers

No Water Masers Associated with Supernova Remnants

1999 ◽  
Vol 117 (3) ◽  
pp. 1387-1391 ◽  
Author(s):  
M. J. Claussen ◽  
W. M. Goss ◽  
D. A. Frail ◽  
M. Seta
Keyword(s):  
Supernova Remnants ◽  
Water Masers

An accreting < 105M⊙ black hole at the center of dwarf galaxy IC750

2019 ◽  
Vol 15 (S356) ◽  
pp. 376-376
Author(s):  
Ingyin Zaw
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Dwarf Galaxies ◽  
Dwarf Galaxy ◽  
Host Galaxy ◽  
Scaling Relations ◽  
Host Galaxies ◽  
Seed Formation ◽  
Maser Emission ◽  
Water Masers

AbstractNuclear black holes in dwarf galaxies are important for understanding the low end of the supermassive black hole mass distribution and the black hole-host galaxy scaling relations. IC 750 is a rare system which hosts an AGN, found in ˜0.5% of dwarf galaxies, with circumnuclear 22 GHz water maser emission, found in ˜3–5% of Type 2 AGNs. Water masers, the only known tracer of warm, dense gas in the center parsec of AGNs resolvable in position and velocity, provide the most precise and accurate mass measurements of SMBHs outside the local group. We have mapped the maser emission in IC 750 and find that it traces a nearly edge-on warped disk, 0.2 pc in diameter. The central black hole has an upper limit mass of ˜1 × 105 M⊙ and a best fit mass of ˜8 × 104 M⊙, one to two orders of magnitude below what is expected from black hole-galaxy scaling relations. This has implications for models of black hole seed formation in the early universe, the growth of black holes, and their co-evolution with their host galaxies.

scholarly journals VLBI Observations of Water Masers in the Circumstellar Envelope of IRC$ +$60169

2002 ◽  
Vol 54 (5) ◽  
pp. 757-764 ◽  
Author(s):  
Hiroshi Sudou ◽  
Toshihiro Omodaka ◽  
Hiroshi Imai ◽  
Tetsuo Sasao ◽  
Hiroshi Takaba ◽  
...  
Keyword(s):  
Circumstellar Envelope ◽  
Vlbi Observations ◽  
Water Masers

scholarly journals A Green Bank Telescope Search for Water Masers in Nearby Active Galactic Nuclei

2004 ◽  
Vol 617 (1) ◽  
pp. L29-L32 ◽  
Author(s):  
J. A. Braatz ◽  
C. Henkel ◽  
L. J. Greenhill ◽  
J. M. Moran ◽  
A. S. Wilson
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Water Masers ◽  
Green Bank Telescope

scholarly journals Water maser and radio continuum emission towards IRAS 23139+5939

2007 ◽  
Vol 3 (S242) ◽  
pp. 180-181
Author(s):  
M. A. Trinidad ◽  
S. Curiel ◽  
J. M. Torrelles ◽  
L. F. Rodríguez ◽  
V. Migenes ◽  
...  
Keyword(s):  
Flux Density ◽  
Line Emission ◽  
The Other ◽  
Radio Continuum ◽  
High Mass ◽  
Continuum Emission ◽  
Maser Line ◽  
Water Masers ◽  
Water Maser ◽  
The Continuum

AbstractWe present simultaneous observations of continuum (3.5 and 1.3cm) and water maser line emission (1.3cm) carried out with the VLA-A toward the high-mass object IRAS 23139+5939. We detected two radio continuum sources at 3.5cm separated by 0”5 (~2400 AU), I23139 and I23139S. Based on the observed continuum flux density and the spectral index, we suggest that I23139 is a thermal radio jet associated with a high-mass YSO. On the other hand, based on the spatio-kinematical distribution of the water masers, together with the continuum emission information, we speculate that I23139S is also a jet source powering some of the masers detected in the region.

Water masers as signposts of extremely young planetary nebulae

2017 ◽  
Vol 13 (S336) ◽  
pp. 377-380
Author(s):  
José F. Gómez ◽  
Luis F. Miranda ◽  
Lucero Uscanga ◽  
Olga Suárez
Keyword(s):  
Planetary Nebulae ◽  
Radio Continuum ◽  
Continuum Emission ◽  
Water Masers ◽  
Water Maser

AbstractOnly five planetary nebulae (PNe) have been confirmed to emit water masers. They seem to be very young PNe. The water emission in these objects preferentially traces circumstellar toroids, although in K 3-35 and IRAS 15103-5754, it may also trace collimated jets. We present water maser observations of these two sources at different epochs. The water maser distribution changes on timescales of months to a few years. We speculate that these changes may be due to the variation of the underlying radio continuum emission, which is amplified by the maser process in the foreground material.

scholarly journals Monitoring Water Masers in Star-Forming Regions

2005 ◽  
pp. 133-141
Author(s):  
J. Brand ◽  
R. Cesaroni ◽  
G. Comoretto ◽  
M. Felli ◽  
F. Palagi ◽  
...  
Keyword(s):  
Star Forming ◽  
Star Forming Regions ◽  
Water Masers

Modelling Interstellar Water Masers

1995 ◽  
pp. 583-584
Author(s):  
J. A. Yates ◽  
M. D. Gray ◽  
D. Field
Keyword(s):  
Water Masers

Probing AGN with Water Masers

1996 ◽  
pp. 211-214
Author(s):  
J. M. Moran ◽  
L. J. Greenhill ◽  
J. R. Herrnstein ◽  
P. J. Diamond ◽  
M. Miyoshi ◽  
...  
Keyword(s):  
Water Masers
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