High-energy sources at low radio frequency: the Murchison Widefield Array view of Fermi blazars

被引：31

作者：

Giroletti, M. ^{[1
]}

Massaro, F. ^{[2
]}

D'Abrusco, R. ^{[3
]}

Lico, R. ^{[4
]}

Burlon, D. ^{[5
,6
]}

Hurley-Walker, N. ^{[7
]}

Johnston-Hollitt, M. ^{[8
]}

Morgan, J. ^{[7
]}

Pavlidou, V. ^{[9
,10
]}

Bell, M. ^{[11
]}

Bernardi, G. ^{[12
]}

Bhat, R. ^{[7
]}

Bowman, J. D. ^{[13
]}

Briggs, F. ^{[6
,14
]}

Cappallo, R. J. ^{[15
]}

Corey, B. E. ^{[15
]}

Deshpande, A. A. ^{[16
]}

Ewall-Rice, A. ^{[17
]}

Emrich, D. ^{[7
]}

Gaensler, B. M. ^{[5
,6
,18
]}

Goeke, R. ^{[17
]}

Greenhill, L. J. ^{[19
]}

Hazelton, B. J. ^{[20
]}

Hindson, L. ^{[8
]}

Kaplan, D. L. ^{[21
]}

Kasper, J. C. ^{[22
]}

Kratzenberg, E. ^{[15
]}

Feng, L. ^{[17
]}

Jacobs, D. ^{[13
]}

Kudryavtseva, N. ^{[7
,23
]}

Lenc, E. ^{[5
,6
]}

Lonsdale, C. J. ^{[15
]}

Lynch, M. J. ^{[7
]}

McKinley, B. ^{[24
]}

McWhirter, S. R. ^{[15
]}

Mitchell, D. A. ^{[6
,11
]}

Morales, M. F. ^{[20
]}

Morgan, E. ^{[17
]}

Oberoi, D. ^{[25
]}

Offringa, A. R. ^{[26
]}

Ord, S. M. ^{[6
,7
]}

Pindor, B. ^{[24
]}

Prabu, T. ^{[16
]}

Procopio, P. ^{[24
]}

Riding, J. ^{[24
]}

Rogers, A. E. E. ^{[15
]}

Roshi, A. ^{[27
,28
]}

Shankar, N. Udaya ^{[16
]}

Srivani, K. S. ^{[16
]}

Subrahmanyan, R. ^{[6
,16
]}

机构：

[1] INAF Osservatorio Radioastron, Via Gobetti 101, I-40129 Bologna, Italy

[2] Univ Turin, Dept Phys, Via Pietro Giuria 1, I-10125 Turin, Italy

[3] Univ Naples Federico II, Dept Phys Sci, Via Cinthia 9, I-80126 Naples, Italy

[4] Univ Bologna, Dipartimento Fis & Astron, Via Ranzani 1, I-40127 Bologna, Italy

[5] Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia

[6] ARC Ctr Excellence All Sky Astrophys CAASTRO, Dublin, Ireland

[7] Curtin Univ Technol, ICRAR, Bentley, WA 6102, Australia

[8] Victoria Univ Wellington, Sch Chem & Phys Sci, POB 600, Wellington 6140, New Zealand

[9] Univ Crete, Iraklion 71003, Greece

[10] Fdn Res & Technol Hellas, Iraklion 71003, Greece

[11] CSIRO Astron & Space Sci CASS, POB 76, Epping, NSW 1710, Australia

[12] Rhodes Univ, Dept Phys & Elect, POB 94, ZA-6140 Grahamstown, South Africa

[13] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA

[14] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia

[15] MIT Haystack Observ, Westford, MA 01886 USA

[16] Raman Res Inst, Bangalore 560080, Karnataka, India

[17] MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[18] Univ Toronto, Dunlap Inst Astron & Astrophys, Toronto, ON M5S 3H4, Canada

[19] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[20] Univ Washington, Dept Phys, Seattle, WA 98195 USA

[21] Univ Wisconsin, Dept Phys, Milwaukee, WI 53201 USA

[22] Univ Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48109 USA

[23] Tallinn Univ Technol, Inst Cybernet, Akad Tee 21, EE-12618 Tallinn, Estonia

[24] Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia

[25] Tata Inst Fundamental Res, Natl Ctr Radio Astrophys, Pune 411007, Maharashtra, India

[26] Netherlands Inst Radio Astron ASTRON, POB 2, NL-7990 AA Dwingeloo, Netherlands

[27] Natl Radio Astron Observ, Edgemont Rd, Charlottesville, VA 22903 USA

[28] Natl Radio Astron Observ, Greenbank, VA 22903 USA

[29] SKA Org, Macclesfield SK11 9DL, Cheshire, England

来源：

ASTRONOMY & ASTROPHYSICS | 2016年 / 588卷

基金：

美国国家科学基金会;

关键词：

BL Lacertae objects: general; catalogs; gamma rays: galaxies; quasars: general; radiation mechanisms: non-thermal; radio continuum: galaxies; ACTIVE GALACTIC NUCLEI; RAY CONNECTION; IMAGING SURVEY; SOUTHERN SKY; CATALOG; LOFAR; SUMSS;

D O I：

10.1051/0004-6361/201527817

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Low-frequency radio arrays are opening a new window for the study of the sky, both to study new phenomena and to better characterize known source classes. Being flat-spectrum sources, blazars are so far poorly studied at low radio frequencies. Aims. We characterize the spectral properties of the blazar population at low radio frequency, compare the radio and high-energy properties of the gamma-ray blazar population, and search for radio counterparts of unidentified gamma-ray sources. Methods. We cross-correlated the 6100 deg(2) Murchison Widefield Array Commissioning Survey catalogue with the Roma blazar catalogue, the third catalogue of active galactic nuclei detected by Fermi-LAT, and the unidentified members of the entire third catalogue of gamma-ray sources detected by Fermi-LAT. When available, we also added high-frequency radio data from the Australia Telescope 20 GHz catalogue. Results. We find low-frequency counterparts for 186 out of 517 (36%) blazars, 79 out of 174 (45%) gamma-ray blazars, and 8 out of 73 (11%) gamma-ray blazar candidates. The mean low-frequency (120-180 MHz) blazar spectral index is <alpha(low)> = 0.57 +/- 0.02: blazar spectra are flatter than the rest of the population of low-frequency sources, but are steeper than at similar to GHz frequencies. Low-frequency radio flux density and gamma-ray energy flux display a mildly significant and broadly scattered correlation. Ten unidentified gamma-ray sources have a (probably fortuitous) positional match with low radio frequency sources. Conclusions. Low-frequency radio astronomy provides important information about sources with a flat radio spectrum and high energy. However, the relatively low sensitivity of the present surveys still misses a significant fraction of these objects. Upcoming deeper surveys, such as the GaLactic and Extragalactic All-Sky MWA (GLEAM) survey, will provide further insight into this population.

引用

页数：9

共 37 条

[31] Synchrotron and inverse-Compton emission from blazar jets - IV.BL Lac type blazars and the physical basis for the blazar sequence
Potter, William J.
Cotter, Garret
[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2013, 436 (01) : 304 - 314
[32] Taylor MB, 2005, ASTR SOC P, V347, P29
[33] The Murchison Widefield Array: The Square Kilometre Array Precursor at Low Radio Frequencies
Tingay, S. J.
Goeke, R.
Bowman, J. D.
Emrich, D.
Ord, S. M.
Mitchell, D. A.
Morales, M. F.
Booler, T.
Crosse, B.
Wayth, R. B.
Lonsdale, C. J.
Tremblay, S.
Pallot, D.
Colegate, T.
Wicenec, A.
Kudryavtseva, N.
Arcus, W.
Barnes, D.
Bernardi, G.
Briggs, F.
Burns, S.
Bunton, J. D.
Cappallo, R. J.
Corey, B. E.
Deshpande, A.
Desouza, L.
Gaensler, B. M.
Greenhill, L. J.
Hall, P. J.
Hazelton, B. J.
Herne, D.
Hewitt, J. N.
Johnston-Hollitt, M.
Kaplan, D. L.
Kasper, J. C.
Kincaid, B. B.
Koenig, R.
Kratzenberg, E.
Lynch, M. J.
Mckinley, B.
Mcwhirter, S. R.
Morgan, E.
Oberoi, D.
Pathikulangara, J.
Prabu, T.
Remillard, R. A.
Rogers, A. E. E.
Roshi, A.
Salah, J. E.
Sault, R. J.
[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA, 2013, 30
[34] Trustedt J., 2014, P 12 EUR VLBI NETW S, V43
[35] UNIFIED SCHEMES FOR RADIO-LOUD ACTIVE GALACTIC NUCLEI
URRY, CM
PADOVANI, P
[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1995, 107 (715) : 803 - 845
[36] LOFAR: The LOw-Frequency ARray
van Haarlem, M. P.
Wise, M. W.
Gunst, A. W.
Heald, G.
McKean, J. P.
Hessels, J. W. T.
de Bruyn, A. G.
Nijboer, R.
Swinbank, J.
Fallows, R.
Brentjens, M.
Nelles, A.
Beck, R.
Falcke, H.
Fender, R.
Horandel, J.
Koopmans, L. V. E.
Mann, G.
Miley, G.
Rottgering, H.
Stappers, B. W.
Wijers, R. A. M. J.
Zaroubi, S.
van den Akker, M.
Alexov, A.
Anderson, J.
Anderson, K.
van Ardenne, A.
Arts, M.
Asgekar, A.
Avruch, I. M.
Batejat, F.
Bahren, L.
Bell, M. E.
Bell, M. R.
van Bemmel, I.
Bennema, P.
Bentum, M. J.
Bernardi, G.
Best, P.
Birzan, L.
Bonafede, A.
Boonstra, A. -J.
Braun, R.
Bregman, J.
Breitling, F.
van de Brink, R. H.
Broderick, J.
Broekema, P. C.
Brouw, W. N.
[J]. ASTRONOMY & ASTROPHYSICS, 2013, 556
[37] GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey
Wayth, R. B.
Lenc, E.
Bell, M. E.
Callingham, J. R.
Dwarakanath, K. S.
Franzen, T. M. O.
For, B. -Q.
Gaensler, B.
Hancock, P.
Hindson, L.
Hurley-Walker, N.
Jackson, C. A.
Johnston-Hollitt, M.
Kapinska, A. D.
McKinley, B.
Morgan, J.
Offringa, A. R.
Procopio, P.
Staveley-Smith, L.
Wu, C.
Zheng, Q.
Trott, C. M.
Bernardi, G.
Bowman, J. D.
Briggs, F.
Cappallo, R. J.
Corey, B. E.
Deshpande, A. A.
Emrich, D.
Goeke, R.
Greenhill, L. J.
Hazelton, B. J.
Kaplan, D. L.
Kasper, J. C.
Kratzenberg, E.
Lonsdale, C. J.
Lynch, M. J.
McWhirter, S. R.
Mitchell, D. A.
Morales, M. F.
Morgan, E.
Oberoi, D.
Ord, S. M.
Prabu, T.
Rogers, A. E. E.
Roshi, A.
Shankar, N. Udaya
Srivani, K. S.
Subrahmanyan, R.
Tingay, S. J.
[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA, 2015, 32

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