J/ApJ/854/124 The Megamaser Cosmology Project. X. (Zhao+, 2018)
The Megamaser Cosmology Project.
X. High-resolution maps and mass constraints for SMBHs.
Zhao W., Braatz J.A., Condon J.J., Lo K.Y., Reid M.J., Henkel C.,
Pesce D.W., Greene J.E., Gao F., Kuo C.Y., Impellizzeri C.M.V.
<Astrophys. J., 854, 124 (2018)>
=2018ApJ...854..124Z 2018ApJ...854..124Z
ADC_Keywords: Active gal. nuclei; Masers; Radio sources; Black holes;
Interferometry
Keywords: accretion, accretion disks ; galaxies: active ; galaxies: ISM ;
galaxies: nuclei ; galaxies: Seyfert
Abstract:
We present high-resolution (submas) Very Long Baseline Interferometry
maps of nuclear H2O megamasers for seven galaxies. In UGC 6093, the
well-aligned systemic masers and high-velocity masers originate in an
edge-on, flat disk and we determine the mass of the central
supermassive black holes (SMBH) to be MSMBH=2.58x107M☉
(±7%). For J1346+5228, the distribution of masers is consistent with
a disk, but the faint high-velocity masers are only marginally
detected, and we constrain the mass of the SMBH to be in the range
(1.5-2.0)x107M☉. The origin of the masers in Mrk 1210 is less
clear, as the systemic and high-velocity masers are misaligned and
show a disorganized velocity structure. We present one possible model
in which the masers originate in a tilted, warped disk, but we do not
rule out the possibility of other explanations including outflow
masers. In NGC 6926, we detect a set of redshifted masers, clustered
within a parsec of each other, and a single blueshifted maser about
4.4pc away, an offset that would be unusually large for a maser disk
system. Nevertheless, if it is a disk system, we estimate the enclosed
mass to be MSMBH<4.8x107M☉. For NGC 5793, we detect
redshifted masers spaced about 1.4pc from a clustered set of
blueshifted features. The orientation of the structure supports a disk
scenario as suggested by Hagiwara+ (2001ApJ...560..119H 2001ApJ...560..119H). We estimate
the enclosed mass to be MSMBH<1.3x107M☉. For NGC 2824 and
J0350-0127, the masers may be associated with parsec- or
subparsec-scale jets or outflows.
Description:
We observed our sample of seven galaxies (Seyfert 2 galaxies and
LINERs, whose H2O megamasers were discovered between 1994 and 2011)
between 2010 May and 2013 January with the Very Long Baseline Array
(VLBA) augmented by the Green Bank Telescope (GBT); meanwhile, the
100m Effelsberg (EB) telescope was also used for UGC 6093. Mrk 1210
and UGC 6093 were observed for three tracks each; the other five
galaxies were observed for one track each.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 81 7 The megamaser sample
table3.dat 82 622 Maser fits
table4.dat 87 22 Re-averaged data
--------------------------------------------------------------------------------
See also:
J/ApJ/695/276 : Search for megamasers in type-2 AGNs (Bennert+, 2009)
J/A+A/530/A147 : Megamaser detection in Seyfert galaxies (Ramolla+, 2011)
J/ApJ/727/20 : The Megamaser Cosmology Project (MCP). III. (Kuo+, 2011)
J/ApJ/817/128 : Megamaser Cosmology Project. VIII. NGC5765B (Gao+, 2016)
J/ApJ/826/L32 : Black hole masses in megamaser disk galaxies (Greene+, 2016)
J/ApJ/834/52 : The Megamaser Cosmology Project (MCP). IX. (Gao+, 2017)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Gal Galaxy name
12 A1 --- f_Gal Flag on Gal (1)
14- 18 I5 km/s VLSR [2752/12307] LSR "optical" velocity from NED
20- 24 F5.1 Mpc Dist [38.9/167.4] Distance DA (2)
26- 36 A11 --- Morph Host galaxy morphological type from NED
38- 40 A3 --- Type AGN type from NED
42- 79 A38 --- Disc Discovery reference
81 A1 --- f_Disc [e] e: Megamaser discovery from previous
Megamaser Cosmology Project (MCP) work and date
--------------------------------------------------------------------------------
Note (1): Flag as follows:
f = NED name SBS 1344+527.
g = NED name.
Note (2): The angular size distance when H0=70km/s/Mpc.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Gal Galaxy identifier
12- 24 A13 --- Code Experiment code identifier
26- 33 F8.2 km/s VLSR [2527/12414] Local Standard of Rest velocity (1)
35- 38 F4.2 km/s Width [1.7/9] Channel width
40- 46 F7.4 mas thetaX [-5.4/4.9] East-west position offset (2)
48- 54 F7.5 mas e_thetaX [0.0009/0.2] Uncertainty in thetaX (3)
56- 63 F8.4 mas thetaY [-13/10.8] North-south position offset (2)
65- 70 F6.4 mas e_thetaY [0.003/0.5] Uncertainty in thetaY (3)
72- 77 F6.2 --- Fnu [1/402] Fitted peak intensity; mJy/beam
79- 82 F4.2 --- e_Fnu [0.5/4.3] RMS uncertainty in Fnu
--------------------------------------------------------------------------------
Note (1): Using the nonrelativistic optical velocity convention.
Note (2): Referred to the position of the brightest systemic maser except
NGC5793. For NGC5793, the positions are referred to the
redshifted maser.
Note (3): Position uncertainties reflect fitting random errors only.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Gal Galaxy identifier
12- 24 A13 --- Code Experiment code identifier
26- 33 F8.2 km/s Vel [7971/11602] Center of velocity range
35- 42 F8.2 km/s b_Vel [7967/11588] Lower boundary of velocity range (1)
44- 51 F8.2 km/s B_Vel [7976/11616] Upper boundary of velocity range (1)
53- 59 F7.4 mas thetaX [-0.3/0.3] East-west position offset (2)
61- 66 F6.4 mas e_thetaX [0.001/0.05] Uncertainty in thetaX (3)
68- 74 F7.4 mas thetaY [-0.4/0.5] North-south position offset (2)
76- 81 F6.4 mas e_thetaY [0.003/0.08] Uncertainty in thetaY (3)
83- 87 F5.1 --- SNR [4/124] Signal-to-Noise ratio (4)
--------------------------------------------------------------------------------
Note (1): The range of LSR velocities (optical convention)
used for re-averaging.
Note (2): Referred to the position of the brightest systemic maser.
Note (3): Position uncertainties reflect fitting random errors only.
Note (4): The ratio of the fitted peak intensity to its rms uncertainty.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Braatz et al. Paper I. 2009ApJ...695..287R 2009ApJ...695..287R
Braatz et al. Paper II. 2010ApJ...718..657B 2010ApJ...718..657B
Kuo et al. Paper III. 2011ApJ...727...20K 2011ApJ...727...20K Cat. J/ApJ/727/20
Reid et al. Paper IV. 2013ApJ...767..154R 2013ApJ...767..154R
Kuo et al. Paper V. 2013ApJ...767..155K 2013ApJ...767..155K
Kuo et al. Paper VI. 2015ApJ...800...26K 2015ApJ...800...26K
Pesce et al. Paper VII. 2015ApJ...810...65P 2015ApJ...810...65P
Gao et al. Paper VIII. 2016ApJ...817..128G 2016ApJ...817..128G Cat. J/ApJ/817/128
Gao et al. Paper IX. 2017ApJ...834...52G 2017ApJ...834...52G Cat. J/ApJ/834/52
Zhao et al. Paper X. 2018ApJ...854..124Z 2018ApJ...854..124Z This Catalog
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 12-Nov-2018