Low-luminosity x-ray active galactic nuclei in S0 galaxies NGC 3065 and NGC 4203

Naoko Iyomoto; Kazuo Makishima; Kyoko Matsushita; Yasushi Fukazawa; Makoto Tashiro; Takaya Ohashi

doi:10.1086/305974

Low-luminosity x-ray active galactic nuclei in S0 galaxies NGC 3065 and NGC 4203

Naoko Iyomoto, Kazuo Makishima, Kyoko Matsushita, Yasushi Fukazawa, Makoto Tashiro, Takaya Ohashi

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

We present ASCA X-ray results on two S0 galaxies, NGC 3065 and NGC 4203. In both galaxies, we detected hard X-ray emission from a pointlike source at the nucleus. A single power-law model having a photon index of ∼ 1.8 well described the spectra of these sources, while thin thermal emission, which is common in S0 galaxies, was not detected. The 2-10 keV luminosities of these nuclear sources (2.2 × 10⁴¹ and 1.5 × 10⁴⁰ ergs s^-1) are 1-2 orders of magnitude higher than those expected as an assembly of low-mass X-ray binaries in these galaxies. Our results strongly suggest that NGC 3065 and NGC 4203 host low-luminosity active galactic nuclei.

Original language	English
Pages (from-to)	168-173
Number of pages	6
Journal	Astrophysical Journal
Volume	503
Issue number	1 PART I
DOIs	https://doi.org/10.1086/305974
Publication status	Published - 1998
Externally published	Yes

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/305974

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title = "Low-luminosity x-ray active galactic nuclei in S0 galaxies NGC 3065 and NGC 4203",

abstract = "We present ASCA X-ray results on two S0 galaxies, NGC 3065 and NGC 4203. In both galaxies, we detected hard X-ray emission from a pointlike source at the nucleus. A single power-law model having a photon index of ∼ 1.8 well described the spectra of these sources, while thin thermal emission, which is common in S0 galaxies, was not detected. The 2-10 keV luminosities of these nuclear sources (2.2 × 1041 and 1.5 × 1040 ergs s-1) are 1-2 orders of magnitude higher than those expected as an assembly of low-mass X-ray binaries in these galaxies. Our results strongly suggest that NGC 3065 and NGC 4203 host low-luminosity active galactic nuclei.",

author = "Naoko Iyomoto and Kazuo Makishima and Kyoko Matsushita and Yasushi Fukazawa and Makoto Tashiro and Takaya Ohashi",

year = "1998",

doi = "10.1086/305974",

language = "English",

volume = "503",

pages = "168--173",

journal = "Astrophysical Journal",

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TY - JOUR

T1 - Low-luminosity x-ray active galactic nuclei in S0 galaxies NGC 3065 and NGC 4203

AU - Iyomoto, Naoko

AU - Makishima, Kazuo

AU - Matsushita, Kyoko

AU - Fukazawa, Yasushi

AU - Tashiro, Makoto

AU - Ohashi, Takaya

PY - 1998

Y1 - 1998

N2 - We present ASCA X-ray results on two S0 galaxies, NGC 3065 and NGC 4203. In both galaxies, we detected hard X-ray emission from a pointlike source at the nucleus. A single power-law model having a photon index of ∼ 1.8 well described the spectra of these sources, while thin thermal emission, which is common in S0 galaxies, was not detected. The 2-10 keV luminosities of these nuclear sources (2.2 × 1041 and 1.5 × 1040 ergs s-1) are 1-2 orders of magnitude higher than those expected as an assembly of low-mass X-ray binaries in these galaxies. Our results strongly suggest that NGC 3065 and NGC 4203 host low-luminosity active galactic nuclei.

AB - We present ASCA X-ray results on two S0 galaxies, NGC 3065 and NGC 4203. In both galaxies, we detected hard X-ray emission from a pointlike source at the nucleus. A single power-law model having a photon index of ∼ 1.8 well described the spectra of these sources, while thin thermal emission, which is common in S0 galaxies, was not detected. The 2-10 keV luminosities of these nuclear sources (2.2 × 1041 and 1.5 × 1040 ergs s-1) are 1-2 orders of magnitude higher than those expected as an assembly of low-mass X-ray binaries in these galaxies. Our results strongly suggest that NGC 3065 and NGC 4203 host low-luminosity active galactic nuclei.

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IS - 1 PART I

ER -

Low-luminosity x-ray active galactic nuclei in S0 galaxies NGC 3065 and NGC 4203

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