Nearby AGN and their hosts in the near infrared

Fischer, Sebastian; Iserlohe, C.; Zuther, J.; Bertram, Thomas; Straubmeier, C.; Schödel, R.; Eckart, A.

doi:10.1051/0004-6361:20053158

Cited by 27 publications

(53 citation statements)

References 41 publications

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“…Calibration was done using 2MASS magnitudes of foreground stars. For details on the data, see Fischer et al (2006).…”

Section: Isaac K-band Imagingmentioning

confidence: 99%

“…They find neutral atomic gas masses ranging from 1.1 × 10 9 M to 3.8 × 10 10 M but no strong correlation between gas mass and infrared emission that traces star formation and AGN activity. Fischer et al (2006) have observed nine galaxies from the sample with the near-infrared (NIR) spectrograph ISAAC (VLT) and find that the spectra show signs for both AGN activity and star formation. In our NIR study (Busch et al , 2014, we find that the LLQSOs do not follow published M BH −L bulge relations for inactive galaxies.…”

Section: Introductionmentioning

confidence: 99%

“…Fischer et al (2006) analyzed NIR JHK-images, as well as H + K-longslit spectra, of nine LLQSOs, including HE 1029-1831, obtained with ISAAC at the VLT. In Fig.…”

Section: Introductionmentioning

confidence: 99%

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A low-luminosity type-1 QSO sample

Busch

Smajić

Scharwächter

et al. 2015

A&A

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Circumnuclear star formation and active galactic nucleus (AGN) feedback is believed to play a critical role in galaxy evolution. The low-luminosity quasi-stellar object (LLQSO) sample that contains 99 of the closest AGN with redshift z ≤ 0.06 fills the gap between the local AGN population and high-redshift QSOs that is essential to understand the AGN evolution with redshift. In this paper, we present the results of the near-infrared H-and K-integral field spectroscopy of the inner kiloparsecs of the LLQSO HE 1029-1831 with SINFONI. Line maps show that ionized hydrogen gas is located in spiral arms within the stellar bar and in a circumnuclear ring. Line fluxes and diagnostic line ratios indicate recent or ongoing star formation in the circumnuclear region and the presence of young and intermediate-age stellar populations in the bulge. In particular, we find traces of an intense starburst in the circumnuclear region that has begun around 100 Myr ago but has declined to a fraction of the maximum intensity now. We estimate the dynamical bulge mass and find that the galaxy follows published M BH −M bulge relations. However, bulge-disk decomposition of the K-band image with B reveals that HE 1029-1831 does not follow the M BH −L bulge relations of inactive galaxies. We conclude that the deviation from M BH −L bulge relations of inactive galaxies in this source is instead caused by young stellar populations and not by an undermassive black hole.

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“…Calibration was done using 2MASS magnitudes of foreground stars. For details on the data, see Fischer et al (2006).…”

Section: Isaac K-band Imagingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A low-luminosity type-1 QSO sample

Busch

Smajić

Scharwächter

et al. 2015

A&A

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“…This particular value was chosen to ensure the presence of the CO(2−0) band head in near-infrared (NIR) K-band spectra. This stellar absorption feature can be used to derive the stellar kinematics of the host galaxy or to analyze stellar populations (Gaffney et al 1995;Fischer et al 2006). These selection criteria result in a sample of 99 galaxies that we call the LLQSO sample throughout the text (for more information see Bertram et al 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Several galaxies from the LLQSO sample have been observed in molecular gas (CO, Bertram et al 2007), atomic hydrogen (H , König et al 2009), and H 2 O-maser-emission (König et al 2012). Fischer et al (2006) studied nine galaxies in the NIR, focusing on spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

A low-luminosity type-1 QSO sample

Busch

Zuther

Valencia-S.

et al. 2014

A&A

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Recognizing the properties of the host galaxies of quasi-stellar objects (QSOs) is essential for understanding the suspected coevolution of central supermassive black holes (BHs) and their host galaxies. Low-luminosity type-1 QSOs (LLQSOs) are ideal targets because of their small cosmological distance, which allows for a detailed structural analysis. We selected a subsample of the Hamburg/ESO survey for bright UV-excess QSOs that contains only the 99 nearest QSOs with redshift z ≤ 0.06. From this LLQSO sample, we observed 20 galaxies and performed aperture photometry and bulge-disk-decomposition with BUDDA on near-infrared J-, H-, and K-band images to separate disk, bulge, bar, and nuclear component. From the photometric decomposition of these 20 objects and visual inspection of images of another 26, we find that ∼50% of the hosts are disk galaxies and most of them (86%) are barred. Stellar masses, calculated from parametric models based on inactive galaxy colors, range from 2 × 10 9 M to 2 × 10 11 M with an average mass of 7 × 10 10 M . Black hole masses measured from single-epoch spectroscopy range from 1 × 10 6 M to 5 × 10 8 M with a median mass of 3 × 10 7 M . In comparison with higher-luminosity QSO samples, LLQSOs tend to have lower stellar and BH masses. Moreover, in the effective radius vs. mean surface-brightness projection of the fundamental plane, they lie in the transition area between luminous QSOs and normal galaxies. This can be seen as additional evidence that they populate a region intermediate between the local Seyfert population and luminous QSOs at higher redshift. This region has not been well studied so far. Eleven LLQSOs, for which we have reliable morphological decompositions and BH mass estimations, lie below the published BH mass vs. bulge luminosity relations for inactive galaxies. This can partially be explained if one assumes that the bulges of active galaxies contain much younger stellar populations than the bulges of inactive galaxies. Another possibility would be that their BHs are undermassive. This might indicate that the growth of the host spheroid precedes that of the BH.

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NIR imaging and spectroscopy of AGN hosts at z⩽0.06

Fischer

Iserlohe

Zuther

et al. 2006

New Astronomy Reviews

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We created a sample of nearby QSOs selected from the Hamburg/ESO survey and the Véron-Cetty & Véron catalog, with a limiting redshift of z≤0.06, which consists of 63 objects. In this contribution, we present the results of our ISAAC Ks-band spectroscopic and H and Ks-band photometric observations of 9 sources of this sample. In seven sources we find hydrogen recombination lines Paα and Brγ of which five galaxies show a broad component. In three sources, extended molecular hydrogen emission is detected in the 1-0S(1) line. The stellar CO-absorption feature is only detectable in 5 objects, those sources with J − H and H − K colors closest to those of ordinary galaxies.

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Nearby AGN and their hosts in the near infrared

Cited by 27 publications

References 41 publications

A low-luminosity type-1 QSO sample

A low-luminosity type-1 QSO sample

A low-luminosity type-1 QSO sample

NIR imaging and spectroscopy of AGN hosts at z⩽0.06

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