J/ApJ/750/170ivo://CDS.VizieR/J/ApJ/750/170doi:10.26093/cds/vizier.17500170CDSAl-Marzouk A.A.Araya E.D.Hofner P.Kurtz S.Linz H.Olmi L.2014-02-13T19:17:04Z2014-01-28T17:03:42ZCDS support team

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

cds-question@unistra.frastrophysical-masersradio-astronomyh-ii-regionsinterstellar-mediumWe report the discovery of 6.035GHz hydroxyl (OH) maser flares toward the massive star-forming region IRAS 18566+0408 (G37.55+0.20), which is the only region known to show periodic formaldehyde (4.8GHz H_2_CO) and methanol (6.7GHz CH_3_OH) maser flares. The observations were conducted between 2008 October and 2010 January with the 305m Arecibo Telescope in Puerto Rico. We detected two flare events, one in 2009 March and one in 2009 September to November. The OH maser flares are not simultaneous with the H_2_ CO flares, but may be correlated with CH_3_ OH flares from a component at corresponding velocities. A possible correlated variability of OH and CH_3_ OH masers in IRAS 18566+0408 is consistent with a common excitation mechanism (IR pumping) as predicted by theory.2012ApJ...750..170Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/750/170CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AN/333/634 : Torun methanol source catalogue (Szymczak+, 2012)J/AZh/89/611 : Class I methanol maser catalog (Bayandina+, 2012)J/ApJ/717/L133 : Formaldehyde maser flares in IRAS 18566+0408 (Araya+, 2010)J/ApJ/669/435 : Arecibo Methanol Maser GP Survey. II. (Pandian+, 2007)J/ApJ/656/255 : Arecibo methanol maser Galactic Plane Survey (Pandian+, 2007)J/AZh/84/839 : Methanol emission of isolated maser condensations (Larionov+,J/A+A/432/737 : General Cat. of 6.7GHz Methanol Masers (Pestalozzi+, 2005)J/A+A/414/235 : OH maser emission from star forming regions (Szymczak+, 2004)J/A+A/358/257 : Molecular clouds SO and CS obs. II. (Nilsson+, 2000)J/A+AS/133/29 : Molecular line survey towards UC HII (Hatchell+ 1998)J/A+A/325/1163 : 330-360GHz spectral lines of G 34.3+0.15. II. (Millar+ 1997)J/A+A/325/255 : 5cm OH masers survey (Baudry+ 1997)J/A+AS/110/81 : Methanol masers towards IRAS sources (van der Walt+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/750/170https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/750/170http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/750/170https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/750/170https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/750/170http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/750/170GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapRadiodefaultJ/ApJ/750/170/table1Line Parameters of 6.035GHz OH in G34.26+0.15recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of observationtime.epochnullablerms[23/282] Root-mean-square noise (1)mJyinstr.det.noiseintSnu[100/640]? OH peak flux density (2)mJyphot.flux.densityintnullableVLSR[55.8/62.5]? LSR Velocity (1)km/sphys.veloc;pos.lsrfloatnullablee_VLSR[0.01/0.5]? VLSR 1{sigma} uncertaintykm/sstat.error;phys.veloc;pos.lsrfloatnullableWidth[0.17/0.9]? Line widthkm/sspect.line.widthfloatnullablee_Width[0.03/0.3]? Width 1{sigma} uncertainty (1)km/sstat.error;spect.line.widthfloatnullableSnudv[0/443]? Integrated flux density of the 6.035GHz line (1)mJy.km/sphot.flux.density;em.radio.6-12GHz;spect.linefloatnullablee_Snudv[0/74]? Snudv 1{sigma} uncertaintymJy.km/sstat.errorfloatnullableJ/ApJ/750/170/table2Line Parameters of the 6.035GHz OH Masers in IRAS 18566+0408 (G37.55+0.20)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of observationtime.epochnullablerms[9/261]? Root-mean-square noisemJyinstr.det.noiseintnullableSnu[106/251]? OH peak flux densitymJyphot.flux.densityintnullableVLSR[85.82/90.03]? Local Standard of Rest Velocitykm/sphys.veloc;pos.lsrfloatnullablee_VLSR[0.01/0.02]? VLSR 1{sigma} uncertaintykm/sstat.error;phys.veloc;pos.lsrfloatnullableWidth[0.2/0.3]? Line widthkm/sspect.line.widthfloatnullablee_Width[0.02/0.06]? Width 1{sigma} uncertaintykm/sstat.error;spect.line.widthfloatnullableSnudv[23/81]? Integrated flux density of the 6.035GHz linemJy.km/sphot.flux.density;em.radio.6-12GHz;spect.linefloatnullablee_Snudv[4/6]? Snudv 1{sigma} uncertaintymJy.km/sstat.errorfloatnullable