J/ApJ/826/L32 Black hole masses in megamaser disk galaxies (Greene+, 2016)
Megamaser disks reveal a broad distribution of black hole mass in spiral
galaxies.
Greene J.E., Seth A., Kim M., Lasker R., Goulding A., Gao F., Braatz J.A.,
Henkel C., Condon J., Lo K.Y., Zhao W.
<Astrophys. J., 826, L32-L32 (2016)>
=2016ApJ...826L..32G 2016ApJ...826L..32G (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; Active gal. nuclei ; Velocity dispersion
Keywords: galaxies: Seyfert; quasars: supermassive black holes
Abstract:
We use new precision measurements of black hole (BH) masses from water
megamaser disks to investigate scaling relations between macroscopic
galaxy properties and supermassive BH mass. The megamaser-derived BH
masses span 106-108M☉, while all the galaxy properties that
we examine (including total stellar mass, central mass density, and
central velocity dispersion) lie within a narrower range. Thus, no
galaxy property correlates tightly with MBH in ∼L* spiral galaxies
as traced by megamaser disks. Of them all, stellar velocity dispersion
provides the tightest relation, but at fixed σ* the mean
megamaser MBH are offset by -0.6±0.1dex relative to early-type
galaxies. Spiral galaxies with non-maser dynamical BH masses do not
appear to show this offset. At low mass, we do not yet know the full
distribution of BH mass at fixed galaxy property; the non-maser
dynamical measurements may miss the low-mass end of the BH
distribution due to an inability to resolve their spheres of influence
and/or megamasers may preferentially occur in lower-mass BHs.
Description:
The velocity dispersion (σ*) presented here for seven
megamaser disk galaxies are measured from three data sets.
Two galaxies (NGC1320, NGC5495) were observed with the B&C
spectrograph on the Dupont telescope at the Las Campanas Observatory.
These spectra have an instrumental resolution of σr∼120km/s
and a wavelength range of 3400-6000Å. Two galaxies (Mrk1029,
ESO558-G009) have σ* measurements from the cross-dispersed
near-infrared spectrograph Triplespec on the 3.5m telescope at Apache
Point. Triplespec has a wavelength range of 0.9-2.4um with a spectral
resolution of σr∼37km/s. Finally, three galaxies (J0437+2456,
NGC5765b, UGC6093) have spectra from the SDSS. They have a spectral
resolution of σr∼65km/s and cover a range of 3800-9200Å.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 77 109 Galaxy sample (from erratum published in
2016, ApJ, 832, L26)
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See also:
J/ApJ/817/128 : Megamaser Cosmology Project. VIII. NGC5765B (Gao+, 2016)
J/ApJ/817/2 : High angular resolution spectroscopy of NGC 1277 (Walsh+, 2016)
J/ApJ/808/183 : NGC1271 stellar kinematics (Walsh+, 2015)
J/ApJS/218/10 : HET Massive Galaxy Survey (HETMGS) (van den Bosch+, 2015)
J/AJ/147/93 : Simulation of massive early type galaxies (Do+, 2014)
J/ApJ/727/20 : The Megamaser Cosmology Project (MCP). III. (Kuo+, 2011)
J/ApJS/168/1 : Black hole mass estimates (Kelly+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 A1 --- f_ID Flag on ID (1)
3- 13 A11 --- ID Galaxy identifier
15- 21 F7.3 Mpc Dist [0.008/153] Distance
23- 24 A2 --- MType Morphological type (2)
26- 30 F5.2 [Msun] MBH [5.6/10.4] Log black hole mass
32- 35 F4.2 [Msun] e_MBH [0.02/0.5] Uncertainty in MBH
37- 40 F4.2 [km/s] sigma* [1.4/2.6] Log stellar velocity
dispersion (σ*) (3)
42- 45 F4.2 [km/s] e_sigma* [0/0.08] Uncertainty in sigma*
47- 51 F5.2 [Msun] Mtot [8.9/11.9]? Log total stellar mass
53- 56 F4.2 [Msun] e_Mtot [0.02/0.7]? Uncertainty in Mtot
58- 62 F5.2 [Msun] M1kpc [8.4/10.8]? Log stellar mass within 1kpc
64- 67 F4.2 [Msun] e_M1kpc [0.02/0.2]? Uncertainty in M1kpc
69- 76 A8 --- Meth Method used to measure black hole mass
("gas", "maser", "star" or "star+gas")
77 A1 --- f_Meth [*] Flag on Meth (4)
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Note (1): Flag as follows:
a = The maser galaxies presented in this work (first seven);
b = The literature maser galaxies (13 megamaser disks from Saglia+
2016ApJ...818...47S 2016ApJ...818...47S);
c = The remaining 88 literature sources (see section 2.1).
Note (2): MType as follows:
1 = elliptical;
2 = S0;
3 = spiral.
Galaxies assumed to harbor pseudobulges
(based on Saglia+ (2016ApJ...818...47S 2016ApJ...818...47S) and assuming that all of
our new megamasers harbor a pseudobulge component) are marked
with a "p".
Note (3): Derived from this paper for the first seven objects (flagged "a"),
newly presented here. The rest of the measurements are taken from
Saglia+ (2016ApJ...818...47S 2016ApJ...818...47S), aside from
NGC 4395 (den Brok+ 2015ApJ...809..101D 2015ApJ...809..101D),
NGC 1271 (Walsh+ 2015, J/ApJ/808/183),
NGC 1277 (Walsh+ 2016, J/ApJ/817/2), and
NGC 1600 (Thomas+ 2016Natur.532..340T 2016Natur.532..340T); see Section 2.1.
Note (4):
* = should be treated with caution, since we cannot find a reference
presenting the BH measurements.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Nov-2016