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Title: FIRST RESULTS FROM A 1.3 cm EXPANDED VERY LARGE ARRAY SURVEY OF MASSIVE PROTOSTELLAR OBJECTS: G35.03+0.35

Abstract

We have performed a 1.3 cm survey of 24 massive young stellar objects (MYSOs) using the Expanded Very Large Array. The sources in the sample exhibit a broad range of massive star formation signposts including infrared dark clouds (IRDCs), ultra-compact H II (UC H II) regions, and extended 4.5 {mu}m emission in the form of extended green objects (EGOs). In this work, we present results for G35.03+0.35 which exhibits all of these phenomena. We simultaneously image the 1.3 cm NH{sub 3} (1,1) through (6,6) inversion lines, four CH{sub 3}OH transitions, two H recombination lines, plus continuum at 0.05 pc resolution. We find three areas of thermal NH{sub 3} emission, two within the EGO (designated as the NE and SW cores) and one toward an adjacent IRDC. The NE core contains a UC H II region (CM1) and a candidate hyper-compact H II region (CM2). A region of non-thermal, likely masing NH{sub 3} (3,3) and (6,6) emission is coincident with an arc of 44 GHz CH{sub 3}OH masers. We also detect two new 25 GHz Class-I CH{sub 3}OH masers. A complementary Submillimeter Array 1.3 mm continuum image shows that the distribution of dust emission is similar to the lower-lying NH{sub 3}more » lines, all peaking to the NW of CM2, indicating the likely presence of an additional MYSO in this protocluster. By modeling the NH{sub 3} and 1.3 mm continuum data, we obtain gas temperatures of 20-220 K and masses of 20-130 M{sub sun}. The diversity of continuum emission properties and gas temperatures suggests that objects in a range of evolutionary states exist concurrently in this protocluster.« less

Authors:
; ; ;  [1];  [2];  [3]
  1. NRAO, 520 Edgemont Road, Charlottesville, VA 22903 (United States)
  2. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)
  3. NRAO, 1003 Lopezville Road, Socorro, NM 87801 (United States)
Publication Date:
OSTI Identifier:
21565449
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/L16; Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMMONIA; DISTRIBUTION; DUSTS; EMISSION; IMAGES; MASERS; METHANOL; STAR EVOLUTION; STARS; ALCOHOLS; AMPLIFIERS; ELECTRONIC EQUIPMENT; EQUIPMENT; EVOLUTION; HYDRIDES; HYDROGEN COMPOUNDS; HYDROXY COMPOUNDS; MICROWAVE AMPLIFIERS; MICROWAVE EQUIPMENT; NITROGEN COMPOUNDS; NITROGEN HYDRIDES; ORGANIC COMPOUNDS

Citation Formats

Brogan, C. L., Hunter, T. R., Friesen, R. K., Indebetouw, R., Cyganowski, C. J., and Chandler, C. J., E-mail: cbrogan@nrao.edu. FIRST RESULTS FROM A 1.3 cm EXPANDED VERY LARGE ARRAY SURVEY OF MASSIVE PROTOSTELLAR OBJECTS: G35.03+0.35. United States: N. p., 2011. Web. doi:10.1088/2041-8205/739/1/L16.
Brogan, C. L., Hunter, T. R., Friesen, R. K., Indebetouw, R., Cyganowski, C. J., & Chandler, C. J., E-mail: cbrogan@nrao.edu. FIRST RESULTS FROM A 1.3 cm EXPANDED VERY LARGE ARRAY SURVEY OF MASSIVE PROTOSTELLAR OBJECTS: G35.03+0.35. United States. doi:10.1088/2041-8205/739/1/L16.
Brogan, C. L., Hunter, T. R., Friesen, R. K., Indebetouw, R., Cyganowski, C. J., and Chandler, C. J., E-mail: cbrogan@nrao.edu. Tue . "FIRST RESULTS FROM A 1.3 cm EXPANDED VERY LARGE ARRAY SURVEY OF MASSIVE PROTOSTELLAR OBJECTS: G35.03+0.35". United States. doi:10.1088/2041-8205/739/1/L16.
@article{osti_21565449,
title = {FIRST RESULTS FROM A 1.3 cm EXPANDED VERY LARGE ARRAY SURVEY OF MASSIVE PROTOSTELLAR OBJECTS: G35.03+0.35},
author = {Brogan, C. L. and Hunter, T. R. and Friesen, R. K. and Indebetouw, R. and Cyganowski, C. J. and Chandler, C. J., E-mail: cbrogan@nrao.edu},
abstractNote = {We have performed a 1.3 cm survey of 24 massive young stellar objects (MYSOs) using the Expanded Very Large Array. The sources in the sample exhibit a broad range of massive star formation signposts including infrared dark clouds (IRDCs), ultra-compact H II (UC H II) regions, and extended 4.5 {mu}m emission in the form of extended green objects (EGOs). In this work, we present results for G35.03+0.35 which exhibits all of these phenomena. We simultaneously image the 1.3 cm NH{sub 3} (1,1) through (6,6) inversion lines, four CH{sub 3}OH transitions, two H recombination lines, plus continuum at 0.05 pc resolution. We find three areas of thermal NH{sub 3} emission, two within the EGO (designated as the NE and SW cores) and one toward an adjacent IRDC. The NE core contains a UC H II region (CM1) and a candidate hyper-compact H II region (CM2). A region of non-thermal, likely masing NH{sub 3} (3,3) and (6,6) emission is coincident with an arc of 44 GHz CH{sub 3}OH masers. We also detect two new 25 GHz Class-I CH{sub 3}OH masers. A complementary Submillimeter Array 1.3 mm continuum image shows that the distribution of dust emission is similar to the lower-lying NH{sub 3} lines, all peaking to the NW of CM2, indicating the likely presence of an additional MYSO in this protocluster. By modeling the NH{sub 3} and 1.3 mm continuum data, we obtain gas temperatures of 20-220 K and masses of 20-130 M{sub sun}. The diversity of continuum emission properties and gas temperatures suggests that objects in a range of evolutionary states exist concurrently in this protocluster.},
doi = {10.1088/2041-8205/739/1/L16},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 739,
place = {United States},
year = {2011},
month = {9}
}