[Lofarpwg] Pastor-Marazuela "New upper limits on low-frequency radio emission from isolated neutron stars with LOFAR" draft

[Cees Bassa]

Hi Joeri, Ines,

As mentioned at the PWG meeting, it would be useful to compare your
limits for Calvera against those that were published in the recent
paper by Maria Arias on a ring of radio emission discovered in LOFAR
imaging which we propose is the Calvera super nova remnant:
https://ui.adsabs.harvard.edu/abs/2022arXiv220714141A/abstract

There we analyzed the public L257877 observation of Calvera and obtain
7 sigma upper limits on period emission of 0.25 mJy assuming a
fractional pulse with of 10%, and 0.8 mJy for 50% pulse width. You
quote 0.26 mJy for 5 sigma, but without the assumed pulse width the
comparison can't be made. What pulse width was assumed?

Did you use any of the X-ray timing ephemerides for the periodic
searches, or do you just rely on the blind search to find
periodicities?

You also mention that you performed single pulse searches, but as far
as I can't tell, no limits on those are quoted, only for the periodic
emission. Is that correct?

Also note that the highest DM pulsar detected with LOFAR is PSR
B1920+21 at DM = 217 pc/cc, see Sanidas et al. 2019.

Regards,
   Cees

On Mon, 2022-09-26 at 11:40 +0000, Joeri van Leeuwen wrote:
> 
> Dear all,
> 
> As mentioned on few occasions over the last few years, Inés, Samayra,
> Joeri and Vlad have analyzed part of the data we took for LC3_036,
> searches for radio emission from isolated neutron stars.
> 
> There are no detections, but there are deep new low-frequency upper
> limits. Because it is part of her thesis, Inés has recently compiled
> this work into a round-off paper, that we aim to submit to A&A+arxiv
> in
> the next few weeks. We attach the current draft here.
> 
> If any of you have an interest in adding to this work, or if we've
> overlooked your earlier contribution when compiling the draft author
> list, get in touch with us before Fri 7 Oct. Other comments welcome
> on
> that timescale, too, of course,
> 
> Cheers,
> Joeri & Inés
> 
> 
> 
> ==

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