Issue |
A&A
Volume 658, February 2022
|
|
---|---|---|
Article Number | A35 | |
Number of page(s) | 7 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361/202142466 | |
Published online | 28 January 2022 |
Host galaxy properties of X-ray active galactic nuclei in the local Universe
1
IAASARS, National Observatory of Athens, I. Metaxa & V. Pavlou 1, Penteli 15236, Greece
e-mail: lazkout@noa.gr
2
Instituto de Fisica de Cantabria (CSIC-Universidad de Cantabria), Avenida de los Castros, 39005 Santander, Spain
Received:
17
October
2021
Accepted:
2
November
2021
We study the host galaxy properties of active galactic nuclei (AGN) that have been detected in X-rays in the nearby Universe (z < 0.2). For that purpose, we use the catalogue provided by the ROSAT-2RXS in the 0.1–2.4 keV energy band, one of the largest X-ray datasets with spectroscopic observations. Our sample consists of ∼900 X-ray AGN. The catalogue provides classification of the sources into type 1 and 2 based on optical spectra. Approximately 25% of the AGN are type 2. We use the available optical, near-IR, and mid-IR photometry to construct spectral energy distributions (SEDs). We measure the stellar mass (M*) and star formation rate (SFR) of the AGN by fitting these SEDs with the X-CIGALE code. We compare the M* and SFR of the two AGN populations, taking their different redshift and luminosity distributions into account. Based on our results, type 2 AGN tend to live in more massive galaxies compared to their type 1 counterparts (log [M∗(M⊙)] = 10.49−0.10+0.16 vs. 10.23−0.08+0.05), in agreement with previous studies at higher redshifts. In terms of SFRs, our analysis shows that, in the nearby Universe, the number of X-ray AGN that live in quiescent systems is higher compared to at higher redshifts, in accordance with previous studies in the local Universe. However, the majority of AGN (∼75%) live inside or above the main sequence.
Key words: galaxies: nuclei / X-rays: galaxies / methods: data analysis / galaxies: active / methods: observational / galaxies: star formation
© ESO 2022
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