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
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