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A study of X-ray emission of galaxies hosting molecular outflows (MOX Sample)

A study of X-ray emission of galaxies hosting molecular outflows (MOX Sample)
A study of X-ray emission of galaxies hosting molecular outflows (MOX Sample)

We have carried out an extensive X-ray spectral analysis of a sample of galaxies exhibiting molecular outflows (MOX sample) to characterize the X-ray properties and investigate the effect of active galactic nuclei (AGNs) on the dynamical properties of the molecular outflows (MOs). We find that the X-ray bolometric correction (L 2-10 keV/L AGN) of these sources ranges from ∼10-4.5 to 10-0.5, with ∼70% of the sources below 10-2, implying a weak X-ray emission relative to the AGN bolometric luminosity (L AGN). However, the upper limit on the 2-10 keV luminosity () obtained from 12 μm flux, following the correlation derived by Asmus et al., is ∼0.5-3 orders of magnitude larger than the L 2-10 keV values estimated using X-ray spectroscopy, implying a possibility that the MOX sources host normal AGNs (not X-ray weak), and their X-ray spectra are extremely obscured. We find that both L 2-10 keV and L AGN correlate strongly with the MO velocity and the mass outflow rates (), implying that the central AGN plays an important role in driving these massive outflows. However, we also find statistically significant positive correlations between the starburst emission and MO mass outflow rate, versus , and L 0.6-2keV versus , which implies that starbursts can generate and drive the MOs. The correlations of MO velocity and with AGN luminosities are found to be stronger compared to those with the starburst luminosities. We conclude that both starbursts and AGNs play a crucial role in driving the large-scale MO.

galaxies: active, galaxies: starburst, ISM: jets and outflows, ISM: molecules, X-rays: galaxies
0004-637X
Laha, Sibasish
29b8174a-9aee-4110-8154-1fe404471bed
Guainazzi, Matteo
c004b1e4-da98-4a27-82f0-bfbfbccd0d47
Piconcelli, Enrico
b06248eb-c797-4f45-a14f-101eced138bc
Gandhi, Poshak
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Ricci, Claudio
47c48bd5-233e-41dd-824a-3df26357d84f
Ghosh, Ritesh
21e1e76d-4984-49c1-a964-944f3a4f0562
Markowitz, Alex G.
dbeebc9c-a3d2-48bf-9a10-bc9226c2582e
Bagchi, Joydeep
e451612e-fca7-4e18-9910-420518ed4fd6
Laha, Sibasish
29b8174a-9aee-4110-8154-1fe404471bed
Guainazzi, Matteo
c004b1e4-da98-4a27-82f0-bfbfbccd0d47
Piconcelli, Enrico
b06248eb-c797-4f45-a14f-101eced138bc
Gandhi, Poshak
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Ricci, Claudio
47c48bd5-233e-41dd-824a-3df26357d84f
Ghosh, Ritesh
21e1e76d-4984-49c1-a964-944f3a4f0562
Markowitz, Alex G.
dbeebc9c-a3d2-48bf-9a10-bc9226c2582e
Bagchi, Joydeep
e451612e-fca7-4e18-9910-420518ed4fd6

Laha, Sibasish, Guainazzi, Matteo, Piconcelli, Enrico, Gandhi, Poshak, Ricci, Claudio, Ghosh, Ritesh, Markowitz, Alex G. and Bagchi, Joydeep (2018) A study of X-ray emission of galaxies hosting molecular outflows (MOX Sample). Astrophysical Journal, 868 (1), [10]. (doi:10.3847/1538-4357/aae390).

Record type: Article

Abstract

We have carried out an extensive X-ray spectral analysis of a sample of galaxies exhibiting molecular outflows (MOX sample) to characterize the X-ray properties and investigate the effect of active galactic nuclei (AGNs) on the dynamical properties of the molecular outflows (MOs). We find that the X-ray bolometric correction (L 2-10 keV/L AGN) of these sources ranges from ∼10-4.5 to 10-0.5, with ∼70% of the sources below 10-2, implying a weak X-ray emission relative to the AGN bolometric luminosity (L AGN). However, the upper limit on the 2-10 keV luminosity () obtained from 12 μm flux, following the correlation derived by Asmus et al., is ∼0.5-3 orders of magnitude larger than the L 2-10 keV values estimated using X-ray spectroscopy, implying a possibility that the MOX sources host normal AGNs (not X-ray weak), and their X-ray spectra are extremely obscured. We find that both L 2-10 keV and L AGN correlate strongly with the MO velocity and the mass outflow rates (), implying that the central AGN plays an important role in driving these massive outflows. However, we also find statistically significant positive correlations between the starburst emission and MO mass outflow rate, versus , and L 0.6-2keV versus , which implies that starbursts can generate and drive the MOs. The correlations of MO velocity and with AGN luminosities are found to be stronger compared to those with the starburst luminosities. We conclude that both starbursts and AGNs play a crucial role in driving the large-scale MO.

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A Study of X-Ray Emission of Galaxies Hosting Molecular Outflows (MOX Sample) - Accepted Manuscript
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Accepted/In Press date: 20 September 2018
e-pub ahead of print date: 13 November 2018
Published date: 20 November 2018
Additional Information: Author Ghandi, has confirmed that record on Arxiv is AM
Keywords: galaxies: active, galaxies: starburst, ISM: jets and outflows, ISM: molecules, X-rays: galaxies

Identifiers

Local EPrints ID: 426801
URI: http://eprints.soton.ac.uk/id/eprint/426801
ISSN: 0004-637X
PURE UUID: 3a6f5f61-8ea4-4fa0-a1c0-5031f2b8cbff
ORCID for Poshak Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 12 Dec 2018 17:30
Last modified: 07 Oct 2020 02:06

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Contributors

Author: Sibasish Laha
Author: Matteo Guainazzi
Author: Enrico Piconcelli
Author: Poshak Gandhi ORCID iD
Author: Claudio Ricci
Author: Ritesh Ghosh
Author: Alex G. Markowitz
Author: Joydeep Bagchi

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