J/AJ/163/264 Objects within 10arcmin of AGN from NED (Huber+, 2022)
The Hosts of X-Ray Absorption Lines Toward AGNs.
Huber M.C., Bregman J.N.
<Astron. J., 163, 264 (2022)>
=2022AJ....163..264H 2022AJ....163..264H
ADC_Keywords: Intergalactic medium; Active gal. nuclei; Galaxies;
Photometry, UBV; Spectra, ultraviolet
Keywords: Hot intergalactic medium ; Intergalactic medium phases ;
Intergalactic gas
Abstract:
Most baryonic matter in the universe exists in gaseous form and can be
found in structures such as galactic halos and the low-density
intergalactic medium. Proposed X-ray spectroscopy missions such as
Athena, Arcus, and Lynx will have the capability to identify
absorption lines in spectra toward bright active galactic nuclei
(AGNs), which can be used as tools to probe this missing matter. In
this study, we examine the optical fields surrounding 15 primary
observing targets and identify the foreground galaxies and galaxy
groups that are potential hosts of absorption. We record the basic
properties of the potential host and their angular and physical
separation from the AGN line of sight. This process is done by marking
the location of various galaxies and groups in optical images of the
field surrounding the target and plotting their angular separation
versus redshift to gauge the physical proximity to the background
source. We identify the surrounding objects according to those with
measured redshifts and those that require accurate redshift
measurements.
Description:
We gather information about foreground objects by conducting searches
in the NASA/IPAC Extragalactic Database (NED) for all objects within a
radius of 10" with the AGN at the center. When we have information
from the NED, we use the ESO Online Digitized Sky Survey (DSS) to
obtain optical images of these regions from the second-generation DSS
in the red wave band. This survey uses the Oschin (Palomar Schmidt)
and UK Schmidt telescopes with a limiting magnitude of approximately
22.5mag (BJ). Using a limit 1.5mag lower than this value, we filter
the list to exclude all objects with a magnitude greater than 21mag
(BJ) for fields that had over 100 objects in NED.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 121 1170 Objects within 10arcmin of AGN
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See also:
II/350 : VLT Survey Telescope ATLAS (Shanks+, 2015)
II/371 : The Dark Energy Survey (DES) Data Release 2 (Abott+, 2021)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/ApJS/193/28 : Galaxy survey around 20 UV-bright quasars (Prochaska+, 2011)
J/ApJ/884/L31 : Spectra & HST obs. gal. in 1ES1553+113 field (Johnson+, 2019)
J/ApJS/243/24 : The CASBaH galaxy redshift survey (Prochaska+, 2019)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 22 A22 --- AGN AGN Field
24- 24 A1 --- f_AGN Flag on AGN Field (1)
26- 55 A30 --- Object Object name in AGN Field
57- 58 I2 h RAh [0/23] Hour of Right Ascension (J2000)
60- 61 I2 min RAm Minute of Right Ascension (J2000)
63- 67 F5.2 s RAs Second of Right Ascension (J2000)
69- 69 A1 --- DE- Sign of the Declination (J2000)
70- 71 I2 deg DEd Degree of Declination (J2000)
73- 74 I2 arcmin DEm Arcminute of Declination (J2000)
76- 80 F5.2 arcsec DEs Arcsecond of Declination (J2000)
82- 90 F9.7 --- z [0.002/1.8]? Redshift
92- 95 A4 --- f_z Type of Redshift; spectroscopic or photometric
97-102 F6.3 mag omag [0.53/23.1]? Apparent magnitude
104-111 F8.4 arcmin Sep [0.14/22] Separation of Object from AGN
113-121 F9.3 kpc Impact [24.8/55000]? Impact parameter
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Note (1): Flag as follows:
a = This field is outside the SDSS footprint, with a redshift close to
the spectroscopic limit of ∼0.5. These factors make it a primary
candidate for deeper spectroscopy and photometry (108 occurrences)
b = This source lies outside the SDSS footprint, and the surrounding
objects are not well documented; this is another prime candidate for
deeper imaging (6 occurrences)
c = The objects in this field have mostly photo-z redshift values, so
spectroscopic followup will be necessary (65 occurrences)
d = The only objects with available redshift values lie outside a 10
arcmin radius of the source. Spectroscopic followup with objects in
this field within 10 arcmin are necessary to complete this field
(97 occurrences)
3 = This field lies outside the SDSS footprint has poor spectroscopic
coverage. Deeper imaging is needed to complete the information about
this field (37 occurrences)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 28-Sep-2022