J/ApJ/899/159 Properties of 10 galaxies with Chandra (Frisbie+, 2020)
Properties of the Hot Ambient Medium of Early-type Galaxies Hosting Powerful
Radio Sources.
Frisbie R.L.S., Donahue M., Voit G.M., Connor T., Li Y., Sun M.,
Lakhchaura K., Werner N., Grossova R.
<Astrophys. J., 899, 159 (2020)>
=2020ApJ...899..159F 2020ApJ...899..159F
ADC_Keywords: Galaxies; Radio sources
Keywords: AGN host galaxies ; Early-type galaxies ; Radio galaxies
Abstract:
We present an archival analysis of Chandra X-ray observations for 12
nearby early-type galaxies hosting radio sources with radio power
>1023W/Hz at 1.4GHz, similar to the radio power of the radio source in
NGC4261. Previously, in a similar analysis of eight nearby X-ray and
optically bright elliptical galaxies, Werner et al. found that NGC4261
exhibited unusually low central gas entropy compared to the full
sample. In the central 0.3kpc of NGC4261, the ratio of cooling time to
freefall time (tcool/tff) is less than 10, indicating that cold clouds
may be precipitating out of the hot ambient medium and providing fuel
for accretion in the central region. NGC4261 also hosts the most
powerful radio source in the original sample. Because NGC4261 may
represent an important phase during which powerful feedback from a
central active galactic nucleus (AGN) is fueled by multiphase
condensation in the central kiloparsec, we searched the Chandra
archive for analogs to NGC4261. We present entropy profiles of those
galaxies, as well as profiles of tcool/tff. We find that one of them,
IC4296, exhibits properties similar to NGC4261, including the presence
of only single-phase gas outside of r∼2kpc and a similar central
velocity dispersion. We compare the properties of NGC4261 and IC4296
to hydrodynamic simulations of AGN feedback fueled by precipitation.
Over the course of those simulations, the single-phase galaxy has an
entropy gradient that remains similar to the entropy profiles inferred
from our observations.
Description:
We compiled a Chandra archival sample of nearby (z<0.02) massive
early-type galaxies hosting radio sources with a power output at
1.4GHz.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 60 139 Radial profile properties for each galaxy with
sufficient counts for temperature deprojection.
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See also:
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+, 2005)
J/ApJ/704/1586 : BCGs with radio AGN (Sun, 2009)
J/ApJ/731/L41 : 1.4GHz obs. of bright early-type galaxies (Brown+, 2011)
J/ApJ/794/48 : XMM-Newton galaxy clusters X-ray properties (Connor+, 2014)
J/A+A/594/A116 : HI4PI spectra and column density maps (HI4PI team+, 2016)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Galaxy Name
10- 14 F5.2 kpc Rad [0.14/75.74] Radial bin center
16- 19 F4.2 kpc Rbin [0.06/5.22] Half-width of the radial bin
21- 21 I1 --- kTbin [1/9] Temperature bin group number
23- 27 F5.2 keV kT [0.31/10.89] Best fit temperature
29- 32 F4.2 keV e_kT [0.01/4.5] Uncertainty in kT
34- 35 I2 --- nebin [1/25] Electron density bin number
37- 41 F5.2 10-2cm-3 ne [0.02/29.5] Best fit density
43- 46 F4.2 10-2cm-3 e_ne [0/1.14] Uncertainty in ne
48- 53 F6.2 keV.cm2 K [1.62/525] Calculated entropy
55- 60 F6.2 keV.cm2 e_K [0.04/228] Uncertainty in K
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 22-Oct-2021