Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Mpc-scale radio source associated with the GPS galaxy B1144+352   We present the results of new observations of the enigmatic radio source
B1144+352 with the WSRT at 1.4 GHz. The WENSS and NVSS surveys have revealed
faint extended radio structures on Mpc-scales. We have investigated these
large-scale radio components. One of the radio structures has a leading hotspot
and we conclude that this structure is a large radio lobe associated with the
GPS source. The other contains two separate radio sources which are superposed
on the sky: A low-power radio source at a similar redshift (z=0.065) to the GPS
host galaxy and an extended radio lobe, which we believe is associated with the
GPS host galaxy. Further, the 1.4-GHz flux density of the core has decreased by
70 mJy between 1994 and 1997. We have also retrieved and analysed unpublished
archival ROSAT HRI data of B1144+352. The source has been detected and appears
to be slightly extended in X-rays. The ROSAT data have not detected a large
extended X-ray halo surrounding the host galaxy, limiting the luminosity of the
intra-cluster gas within a radius of 250 kpc to < 2.3 x 10^42 erg/s. B1144+352
is the second GPS galaxy known to be associated with a Mpc-sized radio source,
the other being B1245+676. We argue that the observed structures must be the
result of an interrupted central jet-activity, and that as such these sources
may well be the progenitors of double-double radio galaxies.

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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-th
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th