List of lower mass gap objects

In astrophysics, the lower mass gap is a mass range between the maximum mass for a typical neutron star and the minimum mass for a typical black hole, often defined as roughly 2.5–5 solar masses (). A compact object in this mass range often cannot be confidently determined to be a neutron star or a black hole due to uncertainties in measurement and in the maximum mass of a neutron star (the Tolman-Oppenheimer-Volkoff limit).

This list considers a "lower mass gap object" to be any compact object whose estimated mass or mass range overlaps with the range of 2.5–5 .

List +ObjectMass ()Classification (if known)ReferencesPSR J1641+3627F1.4–3.7Neutron starPrimary object in GW1904251.60−2.52Primary object in V1408 Aquilae2.0–6.2Likely black holeSecondary object in GW190917_114630XMMU J013236.7+303228Neutron starPSR J0952−0607Neutron starCygnus X-3Likely black holePSR J2017−1614Neutron starPSR J1600−3053Neutron starSecondary object in GW190814Likely black holeGRO J0422+32Black hole4U 1543-4752.7–7.5Likely black holeSecondary object in GW2002102MASS J05215658+4359220Likely black holePrimary object in Gaia DR3 3425577610762832384Likely black holePrimary object in GW230529Likely black holeGRO J1655−404.1−7.9Likely black holeGW230529 remnantSecondary object in GW190924_021846Primary object in GW200115_042309Black holePrimary object in GW190426_152155Secondary object in GW230627Black holeSecondary object in GW191113Black holeSecondary object in GW190725_174728Likely black holeSecondary object in GW191129Black holeSecondary object in GW231223_075055Black holeSecondary object in GW231118_090602Black holeSecondary object in GW231020Black holeSecondary object in GW230729Black holeSecondary object in GW190930_133541Black holeSecondary object in GW200316Black hole

See also Stellar black hole § Lower mass gap List of most massive neutron stars List of least massive black holes List of gravitational wave observations

References