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dc.creatorMiller-Jones, J. C. A.en_US
dc.creatorWrobel, J. M.en_US
dc.creatorSivakoff, G. R.en_US
dc.creatorHeinke, C. O.en_US
dc.creatorMiller, R. E.en_US
dc.creatorPlotkin, R. M.en_US
dc.creatorDi Stefano, R.en_US
dc.creatorGreene, J. E.en_US
dc.creatorHo, L. C.en_US
dc.creatorJoseph, T. D.en_US
dc.creatorKong, A. K. H.en_US
dc.creatorMaccarone, T. J.en_US
dc.date.accessioned2016-10-28T19:36:12Z
dc.date.available2016-10-28T19:36:12Z
dc.date.issued2012-08en_US
dc.identifierdoi:10.15781/T2QN5ZF0F
dc.identifier.citationMiller-Jones, J. C. A., J. M. Wrobel, G. R. Sivakoff, C. O. Heinke, R. E. Miller, R. M. Plotkin, R. Di Stefano et al. "The absence of radio emission from the globular cluster G1." The Astrophysical Journal Letters, Vol. 755, No. 1 (Aug., 2012): L1.en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/2152/43008
dc.description.abstractThe detections of both X-ray and radio emission from the cluster G1 in M31 have provided strong support for existing dynamical evidence for an intermediate-mass black hole (IMBH) of mass (1.8 +/- 0.5) x 10(4) M-circle dot at the cluster center. However, given the relatively low significance and astrometric accuracy of the radio detection, and the non-simultaneity of the X-ray and radio measurements, this identification required further confirmation. Here we present deep, high angular resolution, strictly simultaneous X-ray and radio observations of G1. While the X-ray emission (L-X = 1.74(-0.44)(+0.53) x 10(36) (d/750 kpc)(2) erg s(-1) in the 0.5-10 keV band) remained fully consistent with previous observations, we detected no radio emission from the cluster center down to a 3 sigma upper limit of 4.7 mu Jy beam(-1). Our favored explanation for the previous radio detection is flaring activity from a black hole low-mass X-ray binary (LMXB). We performed a new regression of the "Fundamental Plane" of black hole activity, valid for determining black hole mass from radio and X-ray observations of sub-Eddington black holes, finding log M-BH = (1.638 +/- 0.070) log L-R - (1.136 +/- 0.077) log L-X - (6.863 +/- 0.790), with an empirically determined uncertainty of 0.44 dex. This constrains the mass of the X-ray source in G1, if a black hole, to be <9.7 x 10(3) M-circle dot at 95% confidence, suggesting that it is a persistent LMXB. This annuls what was previously the most convincing evidence from radiation for an IMBH in the Local Group, though the evidence for an IMBH in G1 from velocity dispersion measurements remains unaffected by these results.en_US
dc.description.sponsorshipNSERCen_US
dc.description.sponsorshipIngenuity New Faculty Awarden_US
dc.description.sponsorshipNWO Vidi Fellowshipen_US
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectaccretion, accretion disksen_US
dc.subjectglobular clusters: individualen_US
dc.subject(mayall-ii=g1)en_US
dc.subjectx-rays: binariesen_US
dc.subjectmass black-holeen_US
dc.subjectfundamental planeen_US
dc.subjectstar-clustersen_US
dc.subjectmayall ii=g1en_US
dc.subjectxmm-newtonen_US
dc.subjectx-raysen_US
dc.subjecttelescopeen_US
dc.subjectevolutionen_US
dc.subjectgalaxyen_US
dc.subjectm31en_US
dc.subjectastronomy & astrophysicsen_US
dc.titleThe Absence of Radio Emission from the Globular Cluster G1en_US
dc.typeArticleen_US
dc.description.departmentAstronomyen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1088/2041-8205/755/1/l1en_US
dc.contributor.utaustinauthorGreene, J. E.en_US
dc.relation.ispartofserialAstrophysical Journal Lettersen_US


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