LeMMINGs IV: The X-ray properties of a statistically-complete sample of the nuclei in active and inactive galaxies from the Palomar sampleCitation formats

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LeMMINGs IV: The X-ray properties of a statistically-complete sample of the nuclei in active and inactive galaxies from the Palomar sample. / Williams, D. R. A.; Beswick, R. J.; Moldon, J.; Muxlow, T.W.B.; et al.

In: Royal Astronomical Society. Monthly Notices, 17.11.2021.

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@article{f00e080dbc614b579ae87b72e2f61476,
title = "LeMMINGs IV: The X-ray properties of a statistically-complete sample of the nuclei in active and inactive galaxies from the Palomar sample",
abstract = "All 280 of the statistically-complete Palomar sample of nearby (<120 Mpc) galaxies δ > 20○ have been observed at 1.5 GHz as part of the LeMMINGs e-MERLIN legacy survey. Here, we present Chandra X-ray observations of the nuclei of 213 of these galaxies, including a statistically-complete sub-set of 113 galaxies in the declination range 40○ <δ < 65○. We observed galaxies of all optical spectral types, including {\textquoteleft}active{\textquoteright} galaxies (e.g. LINERs and Seyferts) and {\textquoteleft}inactive{\textquoteright} galaxies like HII galaxies and absorption line galaxies (ALG). The X-ray flux limit of our survey is 1.65 × 10−14 erg s−1 cm−2 (0.3−10 keV). We detect X-ray emission coincident within 2-arcsec of the nucleus in 150/213 galaxies, including 13/14 Seyferts, 68/77 LINERs, 13/22 ALGs and 56/100 HII galaxies, but cannot completely rule out contamination from non-AGN processes in sources with nuclear luminosities ≲1039 erg s−1. We construct an X-ray Luminosity function (XLF) and find that the local galaxy XLF, when including all AGN types, can be represented as a single power-law of slope −0.54 ± 0.06. The Eddington ratio of the Seyferts is usually 2−4 decades higher than that of the LINERs, ALGs and HII galaxies, which are mostly detected with Eddington ratios ≲10−3⁠. Using [OIII] line measurements and BH masses from the literature, we show that LINERs, HII galaxies and ALGs follow similar correlations to low luminosities, suggesting that some {\textquoteleft}inactive{\textquoteright} galaxies may harbour AGN.",
author = "Williams, {D. R. A.} and Beswick, {R. J.} and J. Moldon and T.W.B. Muxlow and {et al.}",
year = "2021",
month = nov,
day = "17",
doi = "10.1093/mnras/stab3310",
language = "English",
journal = "Royal Astronomical Society. Monthly Notices",
issn = "1365-2966",
publisher = "Oxford University Press",

}

RIS

TY - JOUR

T1 - LeMMINGs IV: The X-ray properties of a statistically-complete sample of the nuclei in active and inactive galaxies from the Palomar sample

AU - Williams, D. R. A.

AU - Beswick, R. J.

AU - Moldon, J.

AU - Muxlow, T.W.B.

AU - et al.,

PY - 2021/11/17

Y1 - 2021/11/17

N2 - All 280 of the statistically-complete Palomar sample of nearby (<120 Mpc) galaxies δ > 20○ have been observed at 1.5 GHz as part of the LeMMINGs e-MERLIN legacy survey. Here, we present Chandra X-ray observations of the nuclei of 213 of these galaxies, including a statistically-complete sub-set of 113 galaxies in the declination range 40○ <δ < 65○. We observed galaxies of all optical spectral types, including ‘active’ galaxies (e.g. LINERs and Seyferts) and ‘inactive’ galaxies like HII galaxies and absorption line galaxies (ALG). The X-ray flux limit of our survey is 1.65 × 10−14 erg s−1 cm−2 (0.3−10 keV). We detect X-ray emission coincident within 2-arcsec of the nucleus in 150/213 galaxies, including 13/14 Seyferts, 68/77 LINERs, 13/22 ALGs and 56/100 HII galaxies, but cannot completely rule out contamination from non-AGN processes in sources with nuclear luminosities ≲1039 erg s−1. We construct an X-ray Luminosity function (XLF) and find that the local galaxy XLF, when including all AGN types, can be represented as a single power-law of slope −0.54 ± 0.06. The Eddington ratio of the Seyferts is usually 2−4 decades higher than that of the LINERs, ALGs and HII galaxies, which are mostly detected with Eddington ratios ≲10−3⁠. Using [OIII] line measurements and BH masses from the literature, we show that LINERs, HII galaxies and ALGs follow similar correlations to low luminosities, suggesting that some ‘inactive’ galaxies may harbour AGN.

AB - All 280 of the statistically-complete Palomar sample of nearby (<120 Mpc) galaxies δ > 20○ have been observed at 1.5 GHz as part of the LeMMINGs e-MERLIN legacy survey. Here, we present Chandra X-ray observations of the nuclei of 213 of these galaxies, including a statistically-complete sub-set of 113 galaxies in the declination range 40○ <δ < 65○. We observed galaxies of all optical spectral types, including ‘active’ galaxies (e.g. LINERs and Seyferts) and ‘inactive’ galaxies like HII galaxies and absorption line galaxies (ALG). The X-ray flux limit of our survey is 1.65 × 10−14 erg s−1 cm−2 (0.3−10 keV). We detect X-ray emission coincident within 2-arcsec of the nucleus in 150/213 galaxies, including 13/14 Seyferts, 68/77 LINERs, 13/22 ALGs and 56/100 HII galaxies, but cannot completely rule out contamination from non-AGN processes in sources with nuclear luminosities ≲1039 erg s−1. We construct an X-ray Luminosity function (XLF) and find that the local galaxy XLF, when including all AGN types, can be represented as a single power-law of slope −0.54 ± 0.06. The Eddington ratio of the Seyferts is usually 2−4 decades higher than that of the LINERs, ALGs and HII galaxies, which are mostly detected with Eddington ratios ≲10−3⁠. Using [OIII] line measurements and BH masses from the literature, we show that LINERs, HII galaxies and ALGs follow similar correlations to low luminosities, suggesting that some ‘inactive’ galaxies may harbour AGN.

U2 - 10.1093/mnras/stab3310

DO - 10.1093/mnras/stab3310

M3 - Article

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

SN - 1365-2966

M1 - stab3310

ER -