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Title: WATER AND METHANOL MASER ACTIVITIES IN THE NGC 2024 FIR 6 REGION

Abstract

The NGC 2024 FIR 6 region was observed in the water maser line at 22 GHz and the methanol class I maser lines at 44, 95, and 133 GHz. The water maser spectra displayed several velocity components and month-scale time variabilities. Most of the velocity components may be associated with FIR 6n, while one component was associated with FIR 4. A typical lifetime of the water maser velocity components is about eight months. The components showed velocity fluctuations with a typical drift rate of about 0.01 km s{sup -1} day{sup -1}. The methanol class I masers were detected toward FIR 6. The methanol emission is confined within a narrow range around the systemic velocity of the FIR 6 cloud core. The methanol masers suggest the existence of shocks driven by either the expanding H II region of FIR 6c or the outflow of FIR 6n.

Authors:
; ;  [1];  [2]
  1. Korea Astronomy and Space Science Institute, 776 Daedeokdaero, Yuseong, Daejeon 305-348 (Korea, Republic of)
  2. Department of Astronomy and Space Science, Kyung Hee University, Yongin, Gyeonggi 446-701 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22086371
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 759; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; EMISSION SPECTRA; FLUCTUATIONS; GHZ RANGE; LIFETIME; MASERS; METHANOL; PHOTON EMISSION; STARS; VELOCITY; WATER

Citation Formats

Choi, Minho, Kang, Miju, Byun, Do-Young, and Lee, Jeong-Eun, E-mail: minho@kasi.re.kr. WATER AND METHANOL MASER ACTIVITIES IN THE NGC 2024 FIR 6 REGION. United States: N. p., 2012. Web. doi:10.1088/0004-637X/759/2/136.
Choi, Minho, Kang, Miju, Byun, Do-Young, & Lee, Jeong-Eun, E-mail: minho@kasi.re.kr. WATER AND METHANOL MASER ACTIVITIES IN THE NGC 2024 FIR 6 REGION. United States. doi:10.1088/0004-637X/759/2/136.
Choi, Minho, Kang, Miju, Byun, Do-Young, and Lee, Jeong-Eun, E-mail: minho@kasi.re.kr. Sat . "WATER AND METHANOL MASER ACTIVITIES IN THE NGC 2024 FIR 6 REGION". United States. doi:10.1088/0004-637X/759/2/136.
@article{osti_22086371,
title = {WATER AND METHANOL MASER ACTIVITIES IN THE NGC 2024 FIR 6 REGION},
author = {Choi, Minho and Kang, Miju and Byun, Do-Young and Lee, Jeong-Eun, E-mail: minho@kasi.re.kr},
abstractNote = {The NGC 2024 FIR 6 region was observed in the water maser line at 22 GHz and the methanol class I maser lines at 44, 95, and 133 GHz. The water maser spectra displayed several velocity components and month-scale time variabilities. Most of the velocity components may be associated with FIR 6n, while one component was associated with FIR 4. A typical lifetime of the water maser velocity components is about eight months. The components showed velocity fluctuations with a typical drift rate of about 0.01 km s{sup -1} day{sup -1}. The methanol class I masers were detected toward FIR 6. The methanol emission is confined within a narrow range around the systemic velocity of the FIR 6 cloud core. The methanol masers suggest the existence of shocks driven by either the expanding H II region of FIR 6c or the outflow of FIR 6n.},
doi = {10.1088/0004-637X/759/2/136},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}