Limits on fast radio bursts at 145 MHz with ARTEMIS, a real-time software backend
Fast Radio Bursts (FRBs), are millisecond radio signals that exhibit dispersion larger than what the Galactic electron density can account for. We have conducted a 1446 hour survey for Fast Radio Bursts (FRBs) at 145 MHz, covering a total of 4193 sq. deg on the sky. We used the UK station of the LOF...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Published: |
Oxford University Press
2015
|
| _version_ | 1797080601368461312 |
|---|---|
| author | Karastergiou, A Chennamangalam, J Armour, W Williams, C Mort, B Dulwich, F Salvini, S Magro, A Roberts, S Serylak, M Doo, A Bilous, A Breton, R Falcke, H Griessmeier, J Hessels, J Keane, E Kondratiev, V Kramer, M van Leeuwen, J Noutsos, A Oslowski, S Sobey, C Stappers, B Weltevrede, P |
| author_facet | Karastergiou, A Chennamangalam, J Armour, W Williams, C Mort, B Dulwich, F Salvini, S Magro, A Roberts, S Serylak, M Doo, A Bilous, A Breton, R Falcke, H Griessmeier, J Hessels, J Keane, E Kondratiev, V Kramer, M van Leeuwen, J Noutsos, A Oslowski, S Sobey, C Stappers, B Weltevrede, P |
| author_sort | Karastergiou, A |
| collection | OXFORD |
| description | Fast Radio Bursts (FRBs), are millisecond radio signals that exhibit dispersion larger than what the Galactic electron density can account for. We have conducted a 1446 hour survey for Fast Radio Bursts (FRBs) at 145 MHz, covering a total of 4193 sq. deg on the sky. We used the UK station of the LOFAR radio telescope – the Rawlings Array – , accompanied for a majority of the time by the LOFAR station at Nançay, observing the same fields at the same frequency. Our real-time search backend, ARTEMIS, utilizes graphics processing units to search for pulses with dispersion measures up to 320 cm^-3 pc. Previous derived FRB rates from surveys around 1.4 GHz, and favoured FRB interpretations, motivated this survey, despite all previous detections occurring at higher dispersion measures. We detected no new FRBs above a signal-to-noise threshold of 10, leading to the most stringent upper limit yet on the FRB event rate at these frequencies: 29 sky^-1 day^-1 for 5 ms-duration pulses above 62 Jy. The non-detection could be due to scatter-broadening, limitations on the volume and time searched, or the shape of FRB flux density spectra. Assuming the latter and that FRBs are standard candles, the non-detection is compatible with the published FRB sky rate, if their spectra follow a power law with frequency (∝ v^α), with α ≳ +0.1, demonstrating a marked difference from pulsar spectra. Our results suggest that surveys at higher frequencies, including the low frequency component of the Square Kilometre Array, will have better chances to detect, estimate rates and understand the origin and properties of FRBs. |
| first_indexed | 2024-03-07T01:02:24Z |
| format | Journal article |
| id | oxford-uuid:8a2ba324-cd1b-43bb-b1e5-3b534a13a3c2 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T01:02:24Z |
| publishDate | 2015 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | oxford-uuid:8a2ba324-cd1b-43bb-b1e5-3b534a13a3c22022-03-26T22:29:44ZLimits on fast radio bursts at 145 MHz with ARTEMIS, a real-time software backendJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:8a2ba324-cd1b-43bb-b1e5-3b534a13a3c2Symplectic Elements at OxfordOxford University Press2015Karastergiou, AChennamangalam, JArmour, WWilliams, CMort, BDulwich, FSalvini, SMagro, ARoberts, SSerylak, MDoo, ABilous, ABreton, RFalcke, HGriessmeier, JHessels, JKeane, EKondratiev, VKramer, Mvan Leeuwen, JNoutsos, AOslowski, SSobey, CStappers, BWeltevrede, PFast Radio Bursts (FRBs), are millisecond radio signals that exhibit dispersion larger than what the Galactic electron density can account for. We have conducted a 1446 hour survey for Fast Radio Bursts (FRBs) at 145 MHz, covering a total of 4193 sq. deg on the sky. We used the UK station of the LOFAR radio telescope – the Rawlings Array – , accompanied for a majority of the time by the LOFAR station at Nançay, observing the same fields at the same frequency. Our real-time search backend, ARTEMIS, utilizes graphics processing units to search for pulses with dispersion measures up to 320 cm^-3 pc. Previous derived FRB rates from surveys around 1.4 GHz, and favoured FRB interpretations, motivated this survey, despite all previous detections occurring at higher dispersion measures. We detected no new FRBs above a signal-to-noise threshold of 10, leading to the most stringent upper limit yet on the FRB event rate at these frequencies: 29 sky^-1 day^-1 for 5 ms-duration pulses above 62 Jy. The non-detection could be due to scatter-broadening, limitations on the volume and time searched, or the shape of FRB flux density spectra. Assuming the latter and that FRBs are standard candles, the non-detection is compatible with the published FRB sky rate, if their spectra follow a power law with frequency (∝ v^α), with α ≳ +0.1, demonstrating a marked difference from pulsar spectra. Our results suggest that surveys at higher frequencies, including the low frequency component of the Square Kilometre Array, will have better chances to detect, estimate rates and understand the origin and properties of FRBs. |
| spellingShingle | Karastergiou, A Chennamangalam, J Armour, W Williams, C Mort, B Dulwich, F Salvini, S Magro, A Roberts, S Serylak, M Doo, A Bilous, A Breton, R Falcke, H Griessmeier, J Hessels, J Keane, E Kondratiev, V Kramer, M van Leeuwen, J Noutsos, A Oslowski, S Sobey, C Stappers, B Weltevrede, P Limits on fast radio bursts at 145 MHz with ARTEMIS, a real-time software backend |
| title | Limits on fast radio bursts at 145 MHz with ARTEMIS, a real-time software backend |
| title_full | Limits on fast radio bursts at 145 MHz with ARTEMIS, a real-time software backend |
| title_fullStr | Limits on fast radio bursts at 145 MHz with ARTEMIS, a real-time software backend |
| title_full_unstemmed | Limits on fast radio bursts at 145 MHz with ARTEMIS, a real-time software backend |
| title_short | Limits on fast radio bursts at 145 MHz with ARTEMIS, a real-time software backend |
| title_sort | limits on fast radio bursts at 145 mhz with artemis a real time software backend |
| work_keys_str_mv | AT karastergioua limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT chennamangalamj limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT armourw limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT williamsc limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT mortb limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT dulwichf limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT salvinis limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT magroa limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT robertss limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT serylakm limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT dooa limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT bilousa limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT bretonr limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT falckeh limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT griessmeierj limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT hesselsj limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT keanee limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT kondratievv limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT kramerm limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT vanleeuwenj limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT noutsosa limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT oslowskis limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT sobeyc limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT stappersb limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend AT weltevredep limitsonfastradioburstsat145mhzwithartemisarealtimesoftwarebackend |