J/ApJ/846/44 Luminous persistent sources in nearby galaxies search (Ofek, 2017)
A search for FRB 121102-like persistent radio-luminous sources --
Candidates and implications for the FRB rate and searches.
Ofek E.O.
<Astrophys. J., 846, 44 (2017)>
=2017ApJ...846...44O 2017ApJ...846...44O
ADC_Keywords: Radio sources ; Galaxies, nearby ; Redshifts ; Radio continuum ;
X-ray sources
Keywords: galaxies: general ; galaxies: statistics ; radio continuum: galaxies
Abstract:
The localization of the repeating fast radio burst (FRB), FRB 121102,
suggests that it is associated with a persistent radio-luminous
compact source in the FRB host galaxy. Using the FIRST radio catalog,
I present a search for luminous persistent sources in nearby galaxies,
with radio luminosities >10% of the FRB 121102 persistent source
luminosity. The galaxy sample contains about 30% of the total galaxy
g-band luminosity within <108Mpc, in a footprint of 10600deg2. After
rejecting sources likely due to active galactic nuclei activity or
background sources, I am left with 11 candidates that are presumably
associated with galactic disks or star-formation regions. At least
some of these candidates are likely to be due to chance alignment. In
addition, I find 85 sources within 1" of galactic nuclei. Assuming
that the radio persistent sources are not related to galactic nuclei
and that they follow the galaxy g-band light, the 11 sources imply a
95% confidence upper limit on the space density of luminous persistent
sources of ≲5x10-5Mpc-3, and that at any given time only a small
fraction of galaxies host a radio-luminous persistent source
(≲10-3L*-1). Assuming a persistent source lifetime of 100
years, this implies a birth rate of ≲5x10-7yr-1Mpc-3. Given the
FRB volumetric rate, and assuming that all FRBs repeat and are
associated with persistent radio sources, this sets a lower limit on
the rate of FRB events per persistent source of ≳0.8yr-1. I argue
that these 11 candidates are good targets for FRB searches and I
estimate the FRB event rate from these candidates.
Description:
I compiled a catalog of nearby galaxies within 108Mpc. The catalog is
based on combining the HyperLEDA galaxies (Paturel+ 2003, VII/238 ;
Makarov+ 2014A&A...570A..13M 2014A&A...570A..13M) with the NASA Extragalactic Database
(NED) redshifts, and the Sloan Digital Sky Survey (SDSS; York+
2000AJ....120.1579Y 2000AJ....120.1579Y ; see V/147) galaxies with known redshifts. Both
catalogs are restricted to the FIRST radio survey footprint (Becker+
1995ApJ...450..559B 1995ApJ...450..559B ; see VIII/92).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 136 122 *Luminous persistent radio source candidates
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Note on table1.dat: A list of radio sources that spatially coincide with nearby
galaxies including the 11 best candidates.
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See also:
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)
VII/238 : HYPERLEDA. II. Homogenized HI data (Paturel+, 2003)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
VIII/92 : The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015)
J/AJ/127/2031 : Catalog of neighboring galaxies (Karachentsev+, 2004)
J/ApJ/703/370 : Radio SNRs in nearby galaxies (Chomiuk+, 2009)
J/ApJ/737/45 : Variable 1.4GHz radio sources from NVSS and FIRST (Ofek+, 2011)
J/ApJ/740/65 : VLA search for 5GHz radio transients (Ofek+, 2011)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Hour of Right Ascension (J2000) (1)
4- 5 I2 min RAm Minute of Right Ascension (J2000) (1)
7- 12 F6.3 s RAs Second of Right Ascension (J2000) (1)
14 A1 --- DE- Sign of the Declination (J2000) (1)
15- 16 I2 deg DEd Degree of Declination (J2000) (1)
18- 19 I2 arcmin DEm Arcminute of Declination (J2000) (1)
21- 25 F5.2 arcsec DEs Arcsecond of Declination (J2000) (1)
26 A1 --- f_pos [b] b = best candidates (11 occurrences)
28- 31 F4.1 mJy fp [1.4/21.1] FIRST peak radio flux
33- 36 F4.2 mJy e_fp [0.1/0.3] Error in fp
38- 41 F4.2 --- Lum [0.1/1] Luminosity (2)
43- 47 F5.3 --- z [0.01/0.03] Spatially coincident galaxy redshift
49- 54 F6.2 arcsec theta [0.02/223.5] Angular distance between radio
source and galaxy
56- 60 F5.1 mJy fNVSS [2/159]? NVSS radio flux (3)
62- 64 F3.1 mJy e_fNVSS [0.4/5.1]? Error in fNVSS
66- 69 F4.1 --- chi [-5.4/30.4]? FIRST to NVSS variability (4)
71- 75 F5.1 ct/ks Xc [13/152.4]? ROSAT count rate (5)
77-136 A60 --- Comm Comment
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Note (1): These are the positions of the radio source.
Note (2): In units of the FRB 121102 persistent source luminosity.
Note (3): A blank indicates a non detection.
Note (4): In units of the 1σ uncertainty (Equation 1).
Note (5): From the ROSAT bright and faint source catalogs (Voges et al.
1999, IX/10 and 2000, IX/29). The search radius used was 45 arcsec.
A blank indicates a non detection.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 16-Apr-2018