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<ri:Resource created="2015-06-17T12:49:32Z" status="active" updated="2025-05-19T09:50:00Z" version="1.2" xmlns:cs="http://www.ivoa.net/xml/ConeSearch/v1.0" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/v1.0" xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0" xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.ivoa.net/xml/ConeSearch/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/ConeSearch.xsd http://www.ivoa.net/xml/VOResource/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource.xsd http://www.ivoa.net/xml/VODataService/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/VODataService.xsd" xsi:type="vs:CatalogService"><title>"Under-massive" black hole candidates</title><shortName>J/ApJ/798/54</shortName><identifier>ivo://CDS.VizieR/J/ApJ/798/54</identifier><altIdentifier>doi:10.26093/cds/vizier.17980054</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Graham A.W.</name></creator><creator><name>Scott N.</name></creator><date role="Updated">2017-10-18T08:24:38Z</date><date role="Created">2015-06-17T12:49:32Z</date><contact><name>CDS support team</name><address>CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France</address><email>cds-question@unistra.fr</email></contact></curation><content><subject>galaxies</subject><subject>visible-astronomy</subject><subject>sloan-photometry</subject><subject>redshifted</subject><subject>active-galactic-nuclei</subject><description>Several recent papers have reported on the occurrence of active galactic nuclei (AGNs) containing undermassive black holes relative to a linear scaling relation between black hole mass (M_bh_) and host spheroid stellar mass (M_sph,*_). However, dramatic revisions to the M_bh_-M_sph,*_ and M_bh_-L_sph_ relations, based on samples containing predominantly inactive galaxies, have recently identified a new steeper relation at M_bh_&lt;~(2-10)x10^8^M_{sun}_, roughly corresponding to M_sph,*_&lt;~(0.3-1)x10^11^M_{sun}_. We show that this steeper, quadratic-like M_bh_-M_sph,*_ relation defined by the Sersic galaxies, i.e., galaxies without partially depleted cores, roughly tracks the apparent offset of the AGN having 10^5^&lt;~M_bh_/M_{sun}_&lt;~0.5x10^8^. That is, these AGNs are not randomly offset with low black hole masses, but also follow a steeper (nonlinear) relation. As noted by Busch et al. (2014, J/A+A/561/A140), confirmation or rejection of a possible AGN offset from the steeper M_bh_-M _sph,*_ relation defined by the Sersic galaxies will benefit from improved stellar mass-to-light ratios for the spheroids hosting these AGNs. Several implications for formation theories are noted. Furthermore, reasons for possible under- and overmassive black holes, the potential existence of intermediate mass black holes (&lt;10^5^M_{sun}_), and the new steep (black hole)-(nuclear star cluster) relation, M_bh_{propto}M_nc_^2.7+/-0.7^, are also discussed.</description><source format="bibcode">2015ApJ...798...54G</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/798/54</referenceURL><type>Catalog</type><contentLevel>Research</contentLevel><relationship><relationshipType>IsServedBy</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/TAP">TAP VizieR generic service</relatedResource></relationship><relationship><relationshipType>IsServedBy</relationshipType><relatedResource>Conesearch service</relatedResource></relationship><relationship><relationshipType>related-to</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/V/139">V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/VII/233">VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/AJ/147/93">J/AJ/147/93 : Simulation of massive early type galaxies (Do+, 2014)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/561/A140">J/A+A/561/A140 : Low-luminosity type-1 QSO sample (Busch+, 2014)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/775/116">J/ApJ/775/116 : z&lt;0.06 active black hole gal. from SDSS-DR8 (Reines+, 2013)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/765/87">J/ApJ/765/87 : Chandra obs. of the 2QZ Cluster 1004+00 (Lehmer+, 2013)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/755/167">J/ApJ/755/167 : Low-mass black holes in SDSS Seyfert 1 gal. 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