Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A near-infrared relationship for estimating black hole masses in active
  galactic nuclei   Black hole masses for samples of active galactic nuclei (AGN) are currently
estimated from single-epoch optical spectra using scaling relations anchored in
reverberation mapping results. In particular, the two quantities needed for
calculating black hole masses, namely, the velocity and the radial distance of
the orbiting gas are derived from the widths of the Balmer hydrogen broad
emission lines and the optical continuum luminosity, respectively. We have
recently presented a near-infrared (near-IR) relationship for estimating AGN
black hole masses based on the widths of the Paschen hydrogen broad emission
lines and the total 1 micron continuum luminosity. The near-IR offers several
advantages over the optical: it suffers less from dust extinction, the AGN
continuum is observed only weakly contaminated by the host galaxy and the
strongest Paschen broad emission lines Pa alpha and Pa beta are unblended. Here
we improve the calibration of the near-IR black hole mass relationship by
increasing the sample from 14 to 23 reverberation-mapped AGN using additional
spectroscopy obtained with the Gemini Near-Infrared Spectrograph (GNIRS). The
additional sample improves the number statistics in particular at the high
luminosity end.

20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol