[vsnet-obs 60785] QSO B013347
Diego Rodriguez
drodrig at jet.es
Sun Feb 10 20:35:22 JST 2008
QSO B013347 20080209.785 15.32CR Diego Rodríguez
Observer: Diego Rodríguez
Telescope: LX200 20-cm f/10
CCD: ST9- USNO A2 -unfiltered and reduced using R mag
************************************************************
----- Original Message -----
From: "Seiichi Yoshida" <comet at aerith.net>
To: <vsnet-chat at ooruri.kusastro.kyoto-u.ac.jp>
Sent: Saturday, February 09, 2008 6:36 PM
Subject: [vsnet-chat 7391] Discovery of optically violently variable quasarQSO B0133+47
> Dear colleagues,
>
> We discovered a quasar QSO B0133+47 is an optically violently variable
> QSO in the course of the MISAO Project.
>
> http://www.aerith.net/misao/variable/MisV1436.html
>
> The variation of this quasar was discovered by Seiichi Yoshida (MISAO
> Project) in the MISAO Project nova survey. It was picked up as one of
> the nova candidates from Youichirou Nakashima (Okayama, Japan)'s
> unfiltered CCD images on 2007 Nov. 11 by the PIXY System 2. Yoshida
> checked Nakashima and Nobuo Ohkura (Okayama, Japan)'s CCD images
> between 2000 and 2007, and confirmed that the object is a real
> variable.
>
> Here are the data of this quasar:
>
> QSO B0133+47 QSO 01 36 58.5948 +47 51 29.100 18.0V
> DA 55 01h36m58s.6 +47o51'29" 19.5 mag(O) -24.4 mag(abs) z=0.859
> USNO-A2.0 1350.01532368 01h36m58s.635 +47o51'29".19 Mag(R):18.3 Mag(B):18.5
>
> It is recorded as a very faint object at 18-19 mag in these catalogs.
> However, it was so bright as 14 mag in 2007 November by the MISAO
> Project observations.
>
> Quasar is a very distant active galactic nucleus. It is usually
> recorded by radio observations, but also optically visible. The radio
> flux is variable, and it also changes its brightness optically.
> However, Taichi Kato (Kyoto University) commented that a quasar with
> such a large amplitude is rare.
>
> This quasar will be classified as a blazar called "optically violently
> variable QSO". Kazuya Ayani (Bisei Observatory) commented that it is a
> rare type among quasars. This quasar is about 7 billion light years
> from our planet, and the apparent brightness of 14 mag is
> extraordinary at this distance.
>
> This quasar has been well researched in the radio observations and
> known to be radio variable, however, little observed optically. Nobody
> has noticed that this quasar becomes so bright.
>
> Therefore, we the MISAO Project registered it as the 1436th new
> variable star, and assigned the designation "MisV1436".
>
> MisV1436
> R.A. 01h36m58s.63
> Decl. +47o51'29".0 (2000.0)
> Mag. 14.1-16.6C
> Type OVV-QSO
>
> http://www.aerith.net/misao/data/misv.cgi?1436
>
> Here are the observation data by the MISAO Project:
>
> 2000 Dec. 1.47 16.2 mag (*1)
> 2001 Dec. 11.46 15.5 mag (*1)
> 2002 Jan. 2.40 16.6 mag (*1)
> 2007 Sept.12.81 15.4 mag (*2)
> Oct. 6.75 15.3 mag (*3)
> Nov. 11.63 14.1 mag (*2)
> Dec. 3.52 14.9 mag (*2)
>
> (*1) Nobuo Ohkura 500-mm camera lens + SBIG ST-8
> (*2) Youichirou Nakashima 7.6-cm f/6.6 refractor + SBIG ST-8
> (*3) Nobuo Ohkura and Youichirou Nakashima 7.6-cm f/6.6 refractor + SBIG ST-8
>
> I also investigated the past brightness of this quasar in the
> Digitized Sky Survey POSS-I / POSS-II plates using:
>
> USNO Flagstaff Station Integrated Image and Catalogue Archive Service
> http://www.nofs.navy.mil/data/FchPix/cfra.html
>
> I selected one star with similar brightness around the quasar in each
> plate. Here is the list with the magnitude in the USNO-A2.0 catalog.
>
> Date Star with similar brightness to the quasar, and its brightness
> -------------------------------------------------------------------------
> 1953.7810 18.7 mag USNO-A2.0 1350-01532664 18.6R 18.9B
> 1953.7810 18.7 mag USNO-A2.0 1350-01532664 18.6R 18.9B
> 1989.7426 17.8 mag USNO-A2.0 1350-01531592 17.7R 17.9B
> 1989.7509 17.8 mag USNO-A2.0 1350-01531592 17.7R 17.9B
> 1990.8268 18.7 mag USNO-A2.0 1350-01532664 18.6R 18.9B
> 1991.7577 19.0 mag USNO-A2.0 1350-01532064 18.7R 19.5B
> 1992.8008 18.7 mag USNO-A2.0 1350-01532664 18.6R 18.9B
> 1992.9760 17.2 mag USNO-A2.0 1350-01533365 16.9R 17.8B
> 1993.6222 15.8 mag USNO-A2.0 1350-01532017 15.6R 16.1B
> 1993.7235 17.0 mag USNO-A2.0 1350-01530812 16.9R 17.1B
> 1995.8207 15.8 mag USNO-A2.0 1350-01532017 15.6R 16.1B
> -------------------------------------------------------------------------
> 2007.8620 14.2 mag USNO-A2.0 1350-01538026 13.9R 14.8B (*4)
>
> It has been so faint as around 18 mag until 1992. But small outbursts
> have occurred twice in 1993 and 1995.
>
> However, the quasar was much brighter than any past DSS plates in the
> MISAO Project CCD images on 2007 November 11 (*4). The MISAO Project
> succeeded to catch its brightest record in the history.
>
> John Greaves investigated the UCAC2 and CMC14 catalogs. The UCAC2
> catalog lists this quasar as 14.3 mag, which suggests this quasar was
> very bright around mid July in 2002. The CMC14 catalog lists it as
> 15.0 mag, which also suggests it was bright around late 2002. The
> standard deviation of the CMC14's magnitude is over 0.7 mag, which
> suggests this quasar's variation.
>
> Reinder J. Bouma searched the Skymorph archive and found that this
> quasar was bright as 15.0 mag on 2002 September 24.
>
> No records brighter than 18 mag have been found before 1992, and no
> records fainter than 17 mag have been found after 1995. This quasar
> may became very active in recent years.
>
> Ayani commented that this quasar is highly polarized, typical for a
> large optical variation. The spectrum in the following literature
> shows broad emission lines, which supports that this quasar is
> classified as an "optically violently variable QSO", not a BL Lac
> object.
>
> http://ads.nao.ac.jp//full/1996ApJS..107..541L/0000564.000.html
>
> Greaves introduced the radiograms of this quasar at the NASA/IPAC
> Extragalactic Database. Greaves commented that this object has a
> relativistic radio jet, and the radio variability looks to stem from
> the interaction of this jet.
>
> Images and maps in NED archive for object [HB89] 0133+476
> http://nedwww.ipac.caltech.edu/cgi-bin/nph-imgdata?objid=60740&objname=[HB89]%200133%2B476
>
> About the MISAO Project and the PIXY system 2:
> http://www.aerith.net/misao/
>
> Best regards,
>
> --
> Seiichi Yoshida
> comet at aerith.net
> http://www.aerith.net/
>
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