[vsnet-id-2mass 17] (fwd) re vsnet-id-2mass 8

[Taichi Kato <tkato>]

Date: Sat, 22 Jul 2000 12:26:46 +0000
From: no name <crawl@zoom.co.uk>
Subject: re vsnet-id-2mass 8

TK wrote:

> Possible 2MASS - ROSAT identification?
> 
>    2MASS:
> 
> 2MASS 023959.104 +573519.63 (2000.0) 12.450 11.708 11.493
> 
>    ROSAT:
> 
> 023958.2 +573528 (2000.0) 1RXS-F_J023958.3+573529 0.013 1.00 1.00
> 

This one is not so clear, but it looks slightly variable across 8 of the
10 plates [BEWARE, 2 of the 10 plates are _not_ filtered].

In this instance there are actually pairs of plates taken several months
to a few years apart that use the _same_ emulsions and filters!  These
pairs can thus be directly compared.  Variation is not overly evident in
all of them: it may just be a slow and low amplitude object, the plate
images marked "sn0115" and "sn0154" possibly showing most difference.

  xxx

I have no means of blinking such images with software, so judgement is
difficult in the low amplitude cases, as exposures differ between plates
[& Iuse both red & blue to try to allow for colour effects].  I will
therefore leave the other ROSAT - 2MASS identifications, which also had
GSC/USNO A2 counterparts, to your own interest.  [Time online is also a
concern].

Cheers

John

John Greaves
UK

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