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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
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) with the NASA Extragalactic Database (NED) redshifts, and the Sloan Digital Sky Survey (SDSS; York+ 2000AJ....120.1579Y ; see V/147) galaxies with known redshifts. Both catalogs are restricted to the FIRST radio survey footprint (Becker+ 1995ApJ...450..559B ; see VIII/92). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 136 122 *Luminous persistent radio source candidates
Note on table1.dat: A list of radio sources that spatially coincide with nearby galaxies including the 11 best candidates.
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
Bytes Format Units Label Explanations
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
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.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 16-Apr-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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