Constarium
← Search

Table · dataset · 2025

MaNGA-DR15 type-1&2 AGN catalogs

Listed in IVOA Registry (Virtual Observatory)

We present a method to identify type-1 active galactic nuclei (AGNs) in the central 3 arcsec integrated spectra of galaxies in the MaNGA DR15 sample.

Description

It is based on flux ratios estimates in spectral bands flanking the expected H {alpha} broad component H {alpha}_BC_. The high signal-to-noise ratio obtained (mean S/N = 84) permits the identification of H {alpha}_BC_ without prior subtraction of the host galaxy (HG) stellar component.

A final sample of 47 type-1 AGN is reported out of 4700 galaxies at z < 0.15. The results were compared with those from other methods based on the SDSS DR7 and MaNGA data. Detection of type-1 AGN in those works compared to our method goes from 26 per cent to 81 per cent.

Read the rest (2 more)

Spectral indexes were used to classify the type-1 AGN spectra according to different levels of AGN-HG contribution, finding 9 AGN-dominated, 14 intermediate, and 24 HG-dominated objects. Complementary data in NIR-MIR allowed us to identify type I AGN-dominated objects as blue and HG-dominated as red in the WISE colours. From NVSS and FIRST radio continuum data, we identify 5 HERGs (high-excitation radio galaxies) and 4 LERGs (low-excitation radio galaxies), three showing evidence of radio-jets in the FIRST maps.

Additional X-ray data from ROSAT allowed us to build [O III] and H {alpha}_BC_ versus X-ray, NIR-MIR, and radio continuum diagrams, showing that L(H {alpha}_BC_) and L([O III]) provide good correlations. The range in H {alpha}_BC_ luminosity is wide 38 < logL(H {alpha}_BC_) < 44, with logFWHM(H {alpha}_BC_) ~ 3-4, covering a range of Eddington ratios of -5.15 < log L_bol_ / L_Edd_ < 0.70. Finally, we also identify and report ten possible changing-look AGN candidates.

Links

Topics

Stated by source
Optical
Inferred from text
Astronomical sciences 74%
Provenance · 1 source records, 9 field assertions
SourceKeyLast seenRaw
IVOA Registry (Virtual Observatory)ivo://cds.vizier/j/mnras/514/362610 d agoJSON v1
FieldAssertionExtractorEvidence
access_levelsource · IVOA Registryconnector:ivoa_registry@1.0.0
concepts[field].anzsrc:group:5101enrichment · IVOA Registrytaxonomy-embedding@1.1.0title+keywords+description (74%)
concepts[field].local:field:astronomymapping · IVOA Registryconnector:ivoa_registry@1.0.0
concepts[modality].ivoa_waveband:opticalsource · IVOA Registryconnector:ivoa_registry@1.0.0
descriptionsource · IVOA Registryconnector:ivoa_registry@1.0.0rr.resource.res_description
license_textsource · IVOA Registryconnector:ivoa_registry@1.0.0
publication_datesource · IVOA Registryconnector:ivoa_registry@1.0.0
titlesource · IVOA Registryconnector:ivoa_registry@1.0.0rr.resource.res_title
updated_datesource · IVOA Registryconnector:ivoa_registry@1.0.0