A BRIGHT RADIO HH OBJECT WITH LARGE PROPER MOTIONS IN THE MASSIVE STAR-FORMING REGION W75N

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/139/6/2433· OSTI ID:21443077

Carrasco-Gonzalez, Carlos; Anglada, Guillem ^[1]; Rodriguez, Luis F ^[2]; Torrelles, Jose M ^[3]; Gonzalez-Martin, Omaira ^[4]

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1. Instituto de Astrofisica de Andalucia (CSIC), Camino Bajo de Huetor 50, E-18008 Granada (Spain)
2. Centro de RadioastronomIa y Astrofisica (UNAM), Apartado Postal 3-72 (Xangari), 58089 Morelia, Michoacan (Mexico)
3. Instituto de Ciencias del Espacio (CSIC/IEEC)-UB, Universitat de Barcelona, Marti i Franques 1, E-08028 Barcelona (Spain)
4. Physics Department, University of Crete, P.O. Box 2208, 71003 Heraklion, Crete (Greece)

We analyze radio continuum and line observations from the archives of the Very Large Array (VLA), as well as X-ray observations from the Chandra archive of the region of massive star formation W75N. Five radio continuum sources are detected: VLA 1, VLA 2, VLA 3, Bc, and VLA 4. VLA 3 appears to be a radio jet; we detect J = 1-0, v = 0 SiO emission toward it, probably tracing the inner parts of a molecular outflow. The radio continuum source Bc, previously believed to be tracing an independent star, is found to exhibit important changes in total flux density, morphology, and position. These results suggest that source Bc is actually a radio Herbig-Haro object, one of the brightest known, powered by the VLA 3 jet source. VLA 4 is a new radio continuum component, located a few arcsec to the south of the group of previously known radio sources. Strong and broad (1,1) and (2,2) ammonia emission is detected from the region containing the radio sources VLA 1, VLA 2, and VLA 3. Finally, the 2-10 keV emission seen in the Chandra/ACIS image shows two regions that could be the termination shocks of the outflows from the multiple sources observed in W75N.

• OSTI ID: 21443077
• Journal Information: Astronomical Journal (New York, N.Y. Online), Vol. 139, Issue 6; Other Information: DOI: 10.1088/0004-6256/139/6/2433; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
AMMONIA
EMISSION
FLUX DENSITY
HERBIG-HARO OBJECTS
IMAGES
MORPHOLOGY
PROPER MOTION
SILICON OXIDES
STARS
X RADIATION
CHALCOGENIDES
ELECTROMAGNETIC RADIATION
HYDRIDES
HYDROGEN COMPOUNDS
IONIZING RADIATIONS
MOTION
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
SILICON COMPOUNDS