J/A+A/699/A375 Nest200047 Chanfra and XMM images (Majumder+, 2025)
X-ray investigation of the remarkable galaxy group Nest200047.
Majumder A., Simionescu A., Plsek T., Brienza M., Churazov E.,
Khabibullin I., Gastaldello F., Botteon A., Roettgering H., Brueggen M.,
Lyskova N., Rajpurohit K., Sunyaev R.A., Wise M.W.
<Astron. Astrophys. 699, A375 (2025)>
=2025A&A...699A.375M 2025A&A...699A.375M (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; X-ray sources
Keywords: shock waves - methods: data analysis - galaxies: active -
galaxies: groups: individual: Nest200047 -
Abstract:
Galaxy groups are more susceptible to feedback from the central active
galactic nuclei (AGN) due to their lower gravitational
binding energy compared to clusters. This makes them ideal
laboratories to study feedback effects on the overall energy and
baryonic mass budget.
We study the LOFAR-detected galaxy group Nest200047, where there is
clear evidence of multiple generations of radio lobes from the AGN.
Using 140ks Chandra and 25ks XMM-Newton data, we investigate
thermodynamic properties of the intragroup medium including any excess
energy due to the central AGN. We also investigate the X-ray
properties of the central black hole and constrain the 2-10keV
X-ray flux.
We used spectral analysis techniques to measure various thermodynamic
profiles across the whole field of view. We also used both imaging and
spectral analysis to detect and estimate the energy deposited by
potential shocks and cavities. Due to the faint emission from the
object beyond the core, various background effects were considered.
Nest200047 has significant excess entropy, and the AGN likely
contributes to a part of it. There is an excess energy of
(5-6.5)x1060erg within 400kpc, exceeding the binding energy. The
pressure profile indicates that gas is likely being ejected from the
system, resulting in a baryon fraction of ∼4% inside r500. From
scaling relations, we estimate a black hole mass of
(1=4)x109M☉. An upper limit of 2.1c1040erg/s was derived on
the black hole bolometric luminosity, which is ∼2.5% of the Bondi
accretion power.
Nest200047 is likely part of a class of over-heated galaxy groups like
ESO 3060170, AWM 4 and AWM 5. Such excessive heating may lead to high
quenching of star formation. Moreover, the faint X-ray nuclear
emission in Nest is likely due to the accretion energy being converted
into jets rather than radiation.
Description:
Chandra and XMM images in the 0.6-4.0keV band of Nest200047.
Load the files with a viewing software like ds9. The data columns are
well described in FITS format and can they can be read with ds9.
Change the colourscales as required and smooth the images a little as
required to see the structures at different scales. These are
exposure-corrected (flat-fielded) images. The point sources have been
taken out.
Objects:
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RA (2000) DE Designation(s)
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04 06 18.79 +30 18 29.1 Nest200047 = [T2015] nest 200047
04 06 37.73 +30 22 34.7 MCG+05-10-007 (Brightest group galaxy) = LEDA 14467
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 117 2 List of images
img/* . 2 Individual images
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 48 A19 "datime" Obs.date Observation date
50- 54 I5 Kibyte size Size of FITS file
56- 79 A24 --- FileName Name of FITS file, in subdirectory img
81-117 A37 --- Title Title of the FITS file
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Acknowledgements:
Anwesh Majumder, anwesh.majumder(at)uwaterloo.ca
(End) Patricia Vannier [CDS] 25-Jun-2025