J/ApJ/717/L133ivo://CDS.VizieR/J/ApJ/717/L133doi:10.26093/cds/vizier.17179133CDSAraya E.D.Hofner P.Goss W.M.Kurtz S.Richards A.M.S.Linz H.,Olmi L.Sewilo M.2012-07-20T20:21:43Z2012-07-03T12:45:33ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fryoung-stellar-objectsinterstellar-masersradio-astronomyinterstellar-mediumWe 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 (H_2_CO) and methanol (CH_3_OH) masers. The H_2_CO and CH_3_OH 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.2010ApJ...717L.133Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/717/L133CatalogResearchIsServedByTAP VizieR generic servicerelated-toVI/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+,J/A+A/432/737 : General Catalogue of 6.7GHz Methanol Masers (Pestalozzi+,J/A+A/368/845 : Arcetri Catalog of H2O maser sources. Update. (Valdettaro+,J/MNRAS/276/57 : IRAS Galactic star-forming regions. II. (Codella+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/717/L133https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/717/L133http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/717/L133https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/717/L133https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/717/L133http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/717/L133GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap3.2001662755499532e-24 3.2001662755499532e-24RadiodefaultJ/ApJ/717/L133/table1H_2_CO monitoring observationsDateDate of observationtime.epochnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintl_SnuLimit flag on Snumeta.code.errorcharSnuFlux density at 6cm (4829.6594MHz)mJyphot.flux.density;em.radio.3-6GHzfloate_SnuThe RMS uncertainty in SnumJystat.errorfloatTelTelescope identification (Arecibo, VLA, or GBT) (1)meta.id;instr.telchar