J/A+A/633/A106ivo://CDS.VizieR/J/A+A/633/A106doi:10.26093/cds/vizier.36330106CDSHumire P.K.Henkel C.Gong Y.Leurini S.Mauersberger R.,Levshakov S.A.Winkel B.Tarchi A.Castangia P.Malawi A.Asiri H.,Ellingsen S.P.McCarthy T.P.Chen X.Tang X.2020-05-27T13:26:44Z2020-01-17T06:47:30ZCDS support team

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

cds-question@unistra.frgalaxiesastrophysical-masersradio-astronomyMethanol (CH_3_OH) is one of the most abundant interstellar molecules, offering a vast number of transitions to be studied, including many maser lines. However, while the strongest Galactic CH_3_OH lines, the so-called class II masers, show no indications for the presence of superluminous counterparts in external galaxies, the less luminous Galactic class I sources appear to be different. Here we report class I 36GHz ({lambda}~=0.8cm) CH_3_OH 4_-1_ --> 3_0_ E line emission from the nearby galaxies Maffei 2 (D~=6Mpc) and IC 342 (D~=3.5Mpc), measured with the 100m telescope at Effelsberg at three different epochs within a time span of about five weeks. The 36GHz methanol line of Maffei 2 is the second most luminous among the sources detected with certainty outside the Local Group of galaxies. This is not matched by the moderate infrared luminosity of Maffei 2. Higher-resolution data are required to check whether this is related to its prominent bar and associated shocks. Upper limits for M 82, NGC 4388, NGC 5728 and Arp 220 are also presented. The previously reported detection of 36GHz maser emission in Arp 220 is not confirmed. Nondetections are reported from the related class I 44GHz ({lambda}~=0.7cm) methanol transition towards Maffei 2 and IC 342, indicating that this line is not stronger than its 36GHz counterpart. In contrast to the previously detected 36GHz CH3OH emission in NGC 253 and NGC 4945, our 36GHz profiles towards Maffei 2 and IC 342 are similar to those of previously detected nonmasing lines from other molecular species. However, by analogy to our Galactic center region, it may well be possible that the 36GHz methanol lines in Maffei 2 and IC 342 are composed of a large number of faint and narrow maser features that remain spatially unresolved. In view of this, a search for a weak broad 36GHz line component would also be desirable in NGC 253 and NGC 4945.2020A&A...633A.106Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/633/A106CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/633/A106https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/633/A106http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/633/A106https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/633/A106https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/633/A106http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/633/A106GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/633/A106/list (List of fits spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/633/A106/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/633/A106/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/633/A106/list?GETtext/xml+votable180.050000true55.4900567.94130.0055555555555555566/3298 3506 22804https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/633/A106?format=asciiRadiodefaultJ/A+A/633/A106/listList of fits spectraspShow the spectrummeta.ref.urlcharRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintObs.dateObservation datestime.epoch;obsnullablebFreqLower value of relative frequency intervalHzem.freq;stat.mindoubleBFreqUpper value of relative frequency intervalHzem.freq;stat.maxdoubledFreqFrequency resolutionHzspect.resolutionfloatsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits