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J/ApJ/717/L133    Formaldehyde maser flares in IRAS 18566+0408    (Araya+, 2010)

Quasi-periodic formaldehyde maser flares in the massive protostellar object IRAS 18566+0408. Araya E.D., Hofner P., Goss W.M., Kurtz S., Richards A.M.S., Linz H., Olmi L., Sewilo M. <Astrophys. J., 717, L133-L137 (2010)> =2010ApJ...717L.133A
ADC_Keywords: YSOs ; Stars, masers ; Radio lines ; Interstellar medium Keywords: ISM: individual objects (IRAS 18566+0408) - ISM: molecules - masers - radio lines: general Abstract: We report results of an extensive observational campaign of the 6cm formaldehyde maser in the young massive stellar object IRAS 18566+0408 (G37.55+0.20) conducted from 2002 to 2009. Using the Arecibo Telescope, the Very Large Array, and the Green Bank Telescope, we discovered quasi-periodic formaldehyde flares (P∼237 days). Based on Arecibo observations, we also discovered correlated variability between formaldehyde (H2CO) and methanol (CH3OH) masers. The H2CO and CH3OH masers are not spatially coincident, as demonstrated by different line velocities and high angular resolution MERLIN observations. The flares could be caused by variations in the infrared radiation field, possibly modulated by periodic accretion onto a young binary system. Description: Using the 305m Arecibo Telescope, we monitored the 6cm H2CO maser (JKaKc=110-111,νo=4829.6594MHz) in IRAS 18566+0408. The pointing position was 18:59:09.98+04:12:15.6 (J2000). The monitoring program had three intervals: 2006 May to 2007 April, 2008 January to 2008 May, and 2008 October to 2009 November. A total of 48 runs were conducted. Objects: -------------------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------------------- 18 59 10.02 +04 12 14.7 IRAS 18566+0408 = GAL 037.55+00.20 -------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 31 69 H2CO monitoring observations
See also: VI/51 : Collisional Excitation Rates of Formaldehyde (Green 1991) J/MNRAS/391/869 : A mapping survey of massive CO cores (Guan+, 2008) J/ApJ/669/435 : Arecibo Methanol Maser Galactic Plane Survey. II. (Pandian+, 2007) J/A+A/432/737 : General Catalogue of 6.7GHz Methanol Masers (Pestalozzi+, 2005) J/A+A/368/845 : Arcetri Catalog of H2O maser sources. Update. (Valdettaro+, 2001) J/MNRAS/276/57 : IRAS Galactic star-forming regions. II. (Codella+ 1995) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 A11 "YYYY/MMM/DD" Date Date of observation 13 A1 --- l_Snu Limit flag on Snu 14- 18 F5.1 mJy Snu Flux density at 6cm (4829.6594MHz) 20- 23 F4.1 mJy e_Snu The RMS uncertainty in Snu 25- 31 A7 --- Tel Telescope identification (Arecibo, VLA, or GBT) (1)
Note (1): Data prior 2006 is from Araya et al. (2004ApJS..154..579A, 2005ApJ...618..339A, 2007ApJS..170..152A, 2008ApJS..178..330A). The synthesized beams of our VLA observations in A, B, and C configurations were approximately 0.5", 1.7", and 5", respectively.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 07-Jun-2012
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