J/ApJ/808/183 NGC1271 stellar kinematics (Walsh+, 2015)
The black hole in the compact, high-dispersion galaxy NGC 1271.
Walsh J.L., van den Bosch R.C.E., Gebhardt K., Yildirim A., Gultekin K.,
Husemann B., Richstone D.O.
<Astrophys. J., 808, 183 (2015)>
=2015ApJ...808..183W 2015ApJ...808..183W (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Spectroscopy ; Radial velocities ;
Spectra, infrared ; Velocity dispersion
Keywords: black hole physics; galaxies: elliptical and lenticular, cD;
galaxies: individual: NGC 1271; galaxies: kinematics and dynamics;
galaxies: nuclei
Abstract:
Located in the Perseus cluster, NGC 1271 is an early-type galaxy with
a small effective radius of 2.2kpc and a large bulge stellar velocity
dispersion of 276km/s for its K-band luminosity of 8.9x1010L☉.
We present a mass measurement for the black hole in this compact,
high-dispersion galaxy using observations from the Near-infrared
Integral Field Spectrometer on the Gemini North telescope assisted by
laser guide star adaptive optics, large-scale integral field unit
observations with PPAK at the Calar Alto Observatory, and Hubble Space
Telescope WFC3 imaging observations. We are able to map out the
stellar kinematics both on small spatial scales, within the black hole
sphere of influence, and on large scales that extend out to four times
the galaxy's effective radius. We find that the galaxy is rapidly
rotating and exhibits a sharp rise in the velocity dispersion. Through
the use of orbit-based stellar dynamical models, we determine that the
black hole has a mass of (3.0+1.0-1.1)x109M☉ and the
H-band stellar mass-to-light ratio is 1.40+0.13-0.11γ☉
(σ uncertainties). NGC 1271 occupies the sparsely populated
upper end of the black hole mass distribution but is very different
from the brightest cluster galaxies (BCGs) and giant elliptical
galaxies that are expected to host the most massive black holes.
Interestingly, the black hole mass is an order of magnitude larger
than expectations based on the galaxy's bulge luminosity but is
consistent with the mass predicted using the galaxy's bulge stellar
velocity dispersion. More compact, high-dispersion galaxies need to be
studied using high spatial resolution observations to securely
determine black hole masses, as there could be systematic differences
in the black hole scaling relations between these types of galaxies
and the BCGs/giant ellipticals, thereby implying different pathways
for black hole and galaxy growth.
Description:
For NGC 1271, we obtained imaging observations with the HST Wide Field
Camera 3 (WFC3) and the IR/F160W filter under program GO-13050, in
order to measure the galaxy's surface brightness distribution.
We also acquired spectra with the Near-infrared Integral Field
Spectrometer (NIFS) on the 8.1m Gemini North telescope assisted by the
ALTtitude conjugate Adaptive optics for the InfraRed system. The NIFS
laser guide star AO observations were acquired over three nights, on
2012 December 27 and 29 and 2013 January 8, in queue mode under
program GN-2012B-Q-51. We used the filter H+K and the K grating with a
central wavelength of 2.2um to obtain spectra over a 3"x3" field of
view and a spectral resolution of R∼5290.
We also acquired large-scale spectra with the Postdam Multi Aperture
Spectrograph (PMAS) in the Pmas fiber PAcK (PPAK) mode at the 3.5m
telescope at Calar Alto Observatory. The wide-field IFU observations
were taken over three nights, from 2013 January 4 to 6, using the V500
grating to provide coverage of 4200-7000Å with a spectral
resolution of R∼850 at 5000Å. The observations, data reduction, and
kinematic measurements for NGC 1271 will be presented in A. Yildirim
et al. (2015, in preparation).
Objects:
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RA (ICRS) DE Designation(s)
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03 19 11.27 +41 21 12.1 NGC 1271 = LEDA 12367
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 70 127 Gemini/NIFS kinematics
table3.dat 72 268 CAO/PPAK kinematics
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See also:
J/ApJS/218/10 : HET Massive Galaxy Survey (HETMGS) (van den Bosch+, 2015)
J/AJ/146/45 : Spectroscopy of 6 early-type galaxies (Rusli+, 2013)
J/ApJS/203/24 : Structural param. of gal. in CANDELS (van der Wel+, 2012)
J/ApJS/199/36 : Hα survey of nearby clusters of gal. (Sakai+, 2012)
J/ApJS/199/26 : The 2MASS Redshift Survey (2MRS) (Huchra+, 2012)
J/MNRAS/416/2840 : The 2M++ galaxy redshift catalogue (Lavaux+, 2011)
J/MNRAS/414/888 : ATLAS3D project. III. (Emsellem+, 2011)
J/ApJ/662/808 : Cusp radius in luminous elliptical galaxies (Lauer+, 2007)
J/ApJ/655/790 : Groups of galaxies in 2MASS survey (Crook+, 2007)
J/ApJS/152/251 : Indo-US library of coude feed spectra (Valdes+, 2004)
J/PASP/111/438 : Updated Zwicky catalog (UZC) (Falco+, 1999)
J/A+AS/139/141 : Galaxies in the Perseus Cluster (Brunzendorf+, 1999)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.3 arcsec x The x Voronoi bin generator (1)
8- 13 F6.3 arcsec y The y Voronoi bin generator (1)
15- 22 F8.3 km/s RVel [-227/224] Radial velocity (2)
24- 29 F6.3 km/s e_RVel [5/13.3] Error in RVel
31- 37 F7.3 km/s sigma [205/397] Velocity dispersion (2)
39- 44 F6.3 km/s e_sigma [5/15.3] Error in sigma
46- 51 F6.3 --- h3 [-0.08/0.08] line-of-sight velocity
distribution's asymmetric deviation
from a Gaussian (2)
53- 57 F5.3 --- e_h3 [0.01/0.06] Error in h3
59- 64 F6.3 --- h4 [-0.08/0.08] line-of-sight velocity
distribution's symmetric deviation
from a Gaussian (2)
66- 70 F5.3 --- e_h4 [0.01/0.07] Error in h4
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Note (1): Measured relative to the galaxy center. The position angle
is 141.14 degrees, measured counter-clockwise from the
galaxy's major axis to x.
Note (2): The Near-infrared Integral Field Spectrometer (NIFS) kinematics have
been bi-symmetrized.
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.3 arcsec x The x Voronoi bin generator (1)
9- 15 F7.3 arcsec y The y Voronoi bin generator (1)
17- 24 F8.3 km/s RVel [-231/232] Radial velocity (2)
26- 31 F6.3 km/s e_RVel [3/38] Error in RVel
33- 39 F7.3 km/s sigma [82/297] Velocity dispersion (2)
41- 46 F6.3 km/s e_sigma [4/43] Error in sigma
48- 53 F6.3 --- h3 [-0.2/0.2] line-of-sight velocity
distribution's asymmetric deviation
from a Gaussian (2)
55- 59 F5.3 --- e_h3 [0.01/0.3] Error in h3
61- 66 F6.3 --- h4 [-0.09/0.08] line-of-sight velocity
distribution's symmetric deviation
from a Gaussian (2)
68- 72 F5.3 --- e_h4 [0.01/0.3] Error in h4
--------------------------------------------------------------------------------
Note (1): Measured relative to the galaxy center. The position angle
is 140.71 degrees, measured counter-clockwise from the
galaxy's major axis to x.
Note (2): The Pmas fiber PAcK (PPAK) kinematics have been bi-symmetrized.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 02-Dec-2015