Um 625 Revisited: Multiwavelength Study of a Seyfert 1 Galaxy With a Low-Mass Black Hole

Jiang, Ning; Ho, Luis C.; Dong, Xiao-Bo; Yang, Huan; Wang, Junxian

doi:10.1088/0004-637x/770/1/3

Cited by 11 publications

(16 citation statements)

References 108 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The right bottom subplot shows the z = 2, 5 and 7 Magorrian relations of the Tiamat result with thick lines compared with the z ∼ 0.6 Tiamat-125-HR Magorrian relation. Observations from the local Universe are indicated with different symbols (Thornton et al 2008;Jiang et al 2011;Mathur et al 2012;Jiang et al 2013;Reines et al 2013;Scott et al 2013;Busch et al 2014;Sanghvi et al 2014;Yuan et al 2014). We see that the model predicts a similar Magorrian relation at z ∼ 0.6 compared to the local observations and we find an increasing normalization towards lower redshifts in the mass range of 10 10 M < M * < 10 12 M .…”

Section: Black Hole Propertiessupporting

confidence: 51%

Dark-ages reionization and galaxy formation simulation – X. The small contribution of quasars to reionization

Qin

Mutch

Poole

et al. 2017

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

Motivated by recent measurements of the number density of faint AGN at high redshift, we investigate the contribution of quasars to reionization by tracking the growth of central supermassive black holes in an update of the Meraxes semi-analytic model. The model is calibrated against the observed stellar mass function at z ∼ 0.6 − 7, the black hole mass function at z 0.5, the global ionizing emissivity at z ∼ 2 − 5 and the Thomson scattering optical depth. The model reproduces a Magorrian relation in agreement with observations at z < 0.5 and predicts a decreasing black hole mass towards higher redshifts at fixed total stellar mass. With the implementation of an opening angle of 80 deg for quasar radiation, corresponding to an observable fraction of ∼23.4 per cent due to obscuration by dust, the model is able to reproduce the observed quasar luminosity function at z ∼ 0.6 − 6. The stellar light from galaxies hosting faint AGN contributes a significant or dominant fraction of the UV flux. At high redshift, the model is consistent with the bright end quasar luminosity function and suggests that the recent faint z ∼ 4 AGN sample compiled by Giallongo et al. (2015) includes a significant fraction of stellar light. Direct application of this luminosity function to the calculation of AGN ionizing emissivity consequently overestimates the number of ionizing photons produced by quasars by a factor of 3 at z ∼ 6. We conclude that quasars are unlikely to make a significant contribution to reionization.

show abstract

Section: Black Hole Propertiessupporting

confidence: 51%

Dark-ages reionization and galaxy formation simulation – X. The small contribution of quasars to reionization

Qin

Mutch

Poole

et al. 2017

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…In Figure 1, we highlight three famous Seyfert 1 galaxies, NGC 4395, POX 52, and UM 625, to show where they fall on the diagram (yellow circles). As discussed above, NGC 4395 has the only dynamical mass measurement of a CMBH in a dwarf galaxy (den Brok et al 2015), POX 52 has a robust CMBH mass estimate (Barth et al 2004) and UM 625 is a Seyfert 1 galaxy hosting a low-mass CMBH (Jiang et al 2013). It should be noted that UM 625 was added manually, and is not part of our sample as it is neither a dwarf nor nearby, though its low-mass CMBH still makes it an object of interest.…”

Section: Existing Cataloguesmentioning

confidence: 99%

Infrared signature of active massive black holes in nearby dwarf galaxies

Marleau

Clancy

Habas

et al. 2017

A&A

View full text Add to dashboard Cite

Context. We investigate the possible presence of active galactic nuclei (AGN) in dwarf galaxies and other nearby galaxies to identify candidates for follow-up confirmation and dynamical mass measurements. Aims. We identify candidate active central massive black holes (CMBH) using their mid-infrared emission, verify their nature using existing catalogues and optical line emission diagnostics, and study the relationship between their mass and the mass of their host galaxy. Methods. We use the Wide-field Infrared Survey Explorer (WISE) All-Sky Release Source Catalog and examine the infrared colours of a sample of dwarf galaxies and other nearby galaxies in order to identify both unobscured and obscured candidate AGN by applying the infrared colour diagnostic. Stellar masses of galaxies are obtained using a combination of three independent methods. Black hole masses are estimated using the bolometric luminosity of the AGN candidates and computed for three cases of the bolometric-toEddington luminosity ratio. Results. We identify 303 candidate AGN, of which 276 were subsequently found to have been independently identified as AGN via other methods. The remaining 9% require follow-up observations for confirmation. The activity is detected in galaxies with stellar masses from ∼ 10 6 to 10 9 M ; assuming the candidates are AGN, the black hole masses are estimated to be ∼ 10 3 − 10 6 M , adopting L bol = 0.1L Edd . The black hole masses probed are several orders of magnitude smaller than previously reported for centrally located massive black holes. We examine the stellar mass versus black hole mass relationship in this low galaxy mass regime. We find that it is consistent with the existing relation extending linearly (in log-log space) into the lower mass regime. Conclusions. These findings suggest that CMBH are present in low-mass galaxies and in the Local Universe, and provide new impetus for follow-up dynamical studies of quiescent black holes in local dwarf galaxies.

show abstract

“…A few recent papers (e.g. Jiang et al 2011a;Jiang et al 2013;Mathur et al 2012;Reines et al 2013) have, however, shown that there is an offset at the low mass end of the M bh -M sph diagram, such that the black hole mass is lower than predicted by the near-linear M bh -M sph relation established using galaxies having predominantly higher mass black holes. These offset galaxies have been labelled by some to contain pseudobulges -spheroidal components thought to be produced by the secular evolution of a disk and associated with bars (Bardeen 1975;Hohl 1975;Hohl & Zang 1979;Combes & Sanders 1981;Kormendy 1982Kormendy , 1993Kormendy & Kennicutt 2004).…”

mentioning

confidence: 98%

The (Black Hole)-Bulge Mass Scaling Relation at Low Masses

Graham

Scott

2014

ApJ

123

145

View full text Add to dashboard Cite

Several recent papers have reported on the occurrence of active galactic nuclei (AGN) containing under-massive black holes relative to a linear scaling relation between black hole mass (M bh ) and host spheroid stellar mass (M sph, * ). Dramatic revisions to the M bh -M sph, * and M bh -L sph relations, based on samples containing predominantly inactive galaxies, have however recently identified a new steeper relation at M bh (2-10) × 10 8 M ⊙ , roughly corresponding to M sph, * (0.3-1) × 10 11 M ⊙ . We show that this steeper, quadratic-like M bh -M sph, * relation defined by the Sérsic galaxies, i.e. galaxies without partially depleted cores, roughly tracks the apparent offset of the AGN having 10 5 M bh /M ⊙ 0.5 × 10 8 . That is, these AGN are not randomly offset with low black hole masses, but also follow a steeper (non-linear) relation. As noted by Busch et al., confirmation or rejection of a possible AGN offset from the steeper M bh -M sph, * relation defined by the Sérsic galaxies will benefit from improved stellar mass-to-light ratios for the spheroids hosting these AGN. Several implications for formation theories are noted. Furthermore, reasons for possible under-and over-massive black holes, the potential existence of intermediate mass black holes (< 10 5 M ⊙ ), and the new steep (black hole)-(nuclear star cluster) relation, M bh ∝ M 2.7±0.7 nc , are also discussed.

show abstract

Um 625 Revisited: Multiwavelength Study of a Seyfert 1 Galaxy With a Low-Mass Black Hole

Cited by 11 publications

References 108 publications

Dark-ages reionization and galaxy formation simulation – X. The small contribution of quasars to reionization

Dark-ages reionization and galaxy formation simulation – X. The small contribution of quasars to reionization

Infrared signature of active massive black holes in nearby dwarf galaxies

The (Black Hole)-Bulge Mass Scaling Relation at Low Masses

Contact Info

Product

Resources

About