skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: EXPANDED VERY LARGE ARRAY OBSERVATIONS OF THE NEBULA AROUND G79.29+0.46

Abstract

We have observed the radio nebula surrounding the Galactic luminous blue variable candidate G79.29+0.46 with the Expanded Very Large Array (EVLA) at 6 cm. These new radio observations allow a morphological comparison between the radio emission, which traces the ionized gas component, and the mid-IR emission, a tracer of the dust component. The InfraRed Array Camera (8 {mu}m) and the Multiband Imaging Photometer for Spitzer (24 {mu}m and 70 {mu}m) images have been reprocessed and compared with the EVLA map. We confirm the presence of a second shell at 24 {mu}m and also provide evidence for its detection at 70 {mu}m. The differences between the spatial morphology of the radio and mid-IR maps indicate the existence of two dust populations, the cooler one emitting mostly at longer wavelengths. Analysis of the two dusty, nested shells have provided us with an estimate of the characteristic timescales for shell ejection, providing important constraints for stellar evolutionary models. Finer details of the ionized gas distribution can be appreciated thanks to the improved quality of the new 6 cm image, most notably the highly structured texture of the nebula. Evidence of interaction between the nebula and the surrounding interstellar medium can be seen inmore » the radio map, including brighter features that delineate regions where the shell structure is locally modified. In particular, the brighter filaments in the southwest region appear to frame the shocked southwestern clump reported from CO observations.« less

Authors:
; ; ;  [1]; ;  [2];  [3];  [4]
  1. INAF-Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123 Catania (Italy)
  2. Department of Physics and Astronomy, Universita di Catania and INAF-Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123 Catania (Italy)
  3. Spitzer Science Center, California Institute of Technology, Mail Code 314-6, Pasadena, CA 91125 (United States)
  4. Harvard-Smithsonian Center for Astrophysics, 60 Garden St. MS-65, Cambridge, MA 02138-1516 (United States)
Publication Date:
OSTI Identifier:
21565444
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 739; Journal Issue: 1; Other Information: DOI: 10.1088/2041-8205/739/1/L11; Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DUSTS; EMISSION; MORPHOLOGY; NEBULAE; RADIOWAVE RADIATION; STAR EVOLUTION; STARS; ELECTROMAGNETIC RADIATION; EVOLUTION; RADIATIONS

Citation Formats

Umana, G., Buemi, C. S., Trigilio, C., Leto, P., Agliozzo, C., Ingallinera, A., Noriega-Crespo, A., and Hora, J. L., E-mail: Grazia.Umana@oact.inaf.it. EXPANDED VERY LARGE ARRAY OBSERVATIONS OF THE NEBULA AROUND G79.29+0.46. United States: N. p., 2011. Web. doi:10.1088/2041-8205/739/1/L11.
Umana, G., Buemi, C. S., Trigilio, C., Leto, P., Agliozzo, C., Ingallinera, A., Noriega-Crespo, A., & Hora, J. L., E-mail: Grazia.Umana@oact.inaf.it. EXPANDED VERY LARGE ARRAY OBSERVATIONS OF THE NEBULA AROUND G79.29+0.46. United States. doi:10.1088/2041-8205/739/1/L11.
Umana, G., Buemi, C. S., Trigilio, C., Leto, P., Agliozzo, C., Ingallinera, A., Noriega-Crespo, A., and Hora, J. L., E-mail: Grazia.Umana@oact.inaf.it. Tue . "EXPANDED VERY LARGE ARRAY OBSERVATIONS OF THE NEBULA AROUND G79.29+0.46". United States. doi:10.1088/2041-8205/739/1/L11.
@article{osti_21565444,
title = {EXPANDED VERY LARGE ARRAY OBSERVATIONS OF THE NEBULA AROUND G79.29+0.46},
author = {Umana, G. and Buemi, C. S. and Trigilio, C. and Leto, P. and Agliozzo, C. and Ingallinera, A. and Noriega-Crespo, A. and Hora, J. L., E-mail: Grazia.Umana@oact.inaf.it},
abstractNote = {We have observed the radio nebula surrounding the Galactic luminous blue variable candidate G79.29+0.46 with the Expanded Very Large Array (EVLA) at 6 cm. These new radio observations allow a morphological comparison between the radio emission, which traces the ionized gas component, and the mid-IR emission, a tracer of the dust component. The InfraRed Array Camera (8 {mu}m) and the Multiband Imaging Photometer for Spitzer (24 {mu}m and 70 {mu}m) images have been reprocessed and compared with the EVLA map. We confirm the presence of a second shell at 24 {mu}m and also provide evidence for its detection at 70 {mu}m. The differences between the spatial morphology of the radio and mid-IR maps indicate the existence of two dust populations, the cooler one emitting mostly at longer wavelengths. Analysis of the two dusty, nested shells have provided us with an estimate of the characteristic timescales for shell ejection, providing important constraints for stellar evolutionary models. Finer details of the ionized gas distribution can be appreciated thanks to the improved quality of the new 6 cm image, most notably the highly structured texture of the nebula. Evidence of interaction between the nebula and the surrounding interstellar medium can be seen in the radio map, including brighter features that delineate regions where the shell structure is locally modified. In particular, the brighter filaments in the southwest region appear to frame the shocked southwestern clump reported from CO observations.},
doi = {10.1088/2041-8205/739/1/L11},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 739,
place = {United States},
year = {2011},
month = {9}
}