J/ApJ/725/670 Kinematics in the M32 nucleus (Seth, 2010)
Gas accretion in the M32 nucleus: past and present.
Seth A.C.
<Astrophys. J., 725, 670-676 (2010)>
=2010ApJ...725..670S 2010ApJ...725..670S
ADC_Keywords: Galaxies, nearby ; Active gal. nuclei ; Radial velocities ;
Velocity dispersion ; Accretion
Keywords: galaxies: active - galaxies: formation - galaxies: individual (M32) -
galaxies: kinematics and dynamics - galaxies: nuclei
Abstract:
Using adaptive optics assisted Gemini/NIFS data, I study the present
and past gas accretion in the central 3" of the M32 nucleus. From
changes in the spectral slope and CO line depths near the center, I
find evidence for unresolved dust emission resulting from black hole
(BH) accretion. With a luminosity of ∼2x1038erg/s, this dust
emission appears to be the most luminous tracer of current BH
accretion, 2 orders of magnitude more luminous than previously
detected X-ray emission. These observations suggest that using
high-resolution infrared data to search for dust emission may be an
effective way to detect other nearby, low-luminosity BHs, such as
those in globular clusters. I also examine the fossil evidence of gas
accretion contained in the kinematics of the stars in the nucleus. The
higher order moments (h3 and h4) of the line-of-sight velocity
distribution show patterns that are remarkably similar to those seen
on larger scales in elliptical galaxies and in gas-rich merger
simulations. The kinematics suggests the presence of two components in
the M32 nucleus, a dominant disk overlying a pressure supported
component.
Description:
Integral field spectra of the central 3"x3" of M32 were obtained with
Gemini NIFS on 2005 October 23. A total of 11x600s K-band exposures
were taken. Data were obtained from the Gemini Science Archive.
Objects:
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RA (2000) DE Designation(s)
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00 42 41.87 +40 51 57.2 M32 = 2MASX J00424182+4051546
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 3281 Gemini/NIFS kinematic data of the M32 nucleus
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See also:
J/A+A/539/A138 : RR Lyr variable stars in M32 (Fiorentino+, 2012)
J/ApJ/708/817 : RR Lyrae variables in M32 and M31 (Fiorentino+, 2010)
J/ApJS/183/1 : Catalog of central stellar velocity dispersions (Ho+, 2009)
J/ApJ/707/890 : IR properties of E and S0 galaxies (Temi+, 2009)
J/ApJ/702/955 : K-band luminosity function from 2MASX (Devereux+, 2009)
J/MNRAS/382/1552 : Multiwavelength study of nearby galaxy nuclei (Lira+, 2007)
J/ApJ/532/308 : Hot Horizontal Branch Stars in the Core of M32 (Brown+ 2000)
J/ApJ/504/113 : F175W and F275W photometry of M31 and M32 (Brown+, 1998)
J/A+AS/127/117 : Kinematics of galaxies (Prugniel+ 1998)
J/ApJS/112/315 : Spectroscopic parameters of Seyfert nuclei (Ho+ 1997)
J/AJ/104/1349 : Infrared-luminous giants in M32 (Freedman, 1992)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 F6.3 arcsec oRA Right Ascension offset from Nucleus (1)
8- 13 F6.3 arcsec oDE Declination offset from Nucleus (1)
15- 21 F7.2 km/s RV Radial velocity (2)
23- 26 F4.2 km/s e_RV Uncertainty in RV
28- 33 F6.2 km/s sigma Velocity dispersion (2)
35- 38 F4.2 km/s e_sigma Uncertainty in sigma
40- 45 F6.3 --- h3 Skewness (2)
47- 51 F5.3 --- e_h3 Uncertainty in h3
53- 58 F6.3 --- h4 Kurtosis (2)
60- 64 F5.3 --- e_h4 Uncertainty in h4
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Note (1): Center of M2: 00:42:41.829+40:51:54.88 (J2000)
Note (2): parameters of the line-of-sight velocity distribution (LOSVD)
using the penalized-pixel fitting method of Cappellari & Emsellem
(2004PASP..116..138C 2004PASP..116..138C)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 08-Aug-2012