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Telecon Meetings

December 3rd, 2008 - 9 AM (Pacific Time)

  • Welcome
  • End of campaign? (discussion)
  • MW Data Update
    • Fermi
  • Analysis tasks and signup
  • Timeline
  • Logistics
  • AOB

October 23rd, 2008 - 9 AM (Pacific Time)

  • Discussion about Future plans
  • Meeting minutes pdf

Source Information

  • Very interesting source, it is a BL Lac-type object, with weak emission lines at z=0.94, but also with strong absorption lines at z=0.524 (and a weak one at z=0.852), where the absorption at z-0.524 is also seen in H I in radio
  • The last result indicates there is a galaxy in the line of sight, and it is seen as a "damped Ly alpha" absorption system of hydrogen (Hubble opt/UV spectroscopy);  definitive info on absorption in paper by Junkkarinen (2004, ApJ, 614, 658)
  • Presence of galaxy in the line of sight might be suggestive of explanation of variability as microlensing events
  • Strong gamma-ray emitter reported by EGRET (Hunter et al. 1993), but variable - observations in 1994 (Madejski et al. 1996) showed much fainter gamma flux
  • Rapidly variable X-ray emitter, studied by ROSAT and Asca (also Madejski et al. 1996)
  • X-ray data clearly show excess absorption (due to intervening galaxy);  in conjunction with H I and H Ly alpha data, yield metallicity of the intervening absorber
  • For important and relevant papers - especially containing gamma-ray data - I'd add Hunter et al. 1993 (A&A 272, 59)  and Madejski et al. 1996 (ApJ, 459, 156)
  • This is the NED entry http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=0235%2B164&extend=no&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES

Name

RA

DEC

Redshift

L

B

0235+164

39.66

16.62

0.940

156.77

-39.11

Important Papers

Paper

Authors

Title

2008A&A...480..339R

Raiteri, C. M. et al.

Radio-to-UV monitoring of AO 0235+164 by the WEBT and Swift during the 2006-2007 outburst

2007A&A...464..871R

Raiteri, C. M. et al.

Spectroscopic monitoring of the BL Lac object AO 0235+164

2006ApJ...650..749L

LIU, F. K.; ZHA

HARMONIC QPOS AND THICK ACCRETION DISK OSCILLATIONS IN THE BL LACERTAE OBJECT AO 0235+164

2006A&A...459..731R

Raiteri, C. M. et al.

Multifrequency variability of the blazar AO 0235+164. The WEBT campaign in 2004-2005 and long-term SED analysis

2006A&A...452..845R

Raiteri, C. M. et al.

X-ray emission from the blazar AO 0235+16: the XMM-Newton and Chandra point of view

2005A&A...438...39R

Raiteri, C. M. et al.

The WEBT campaign to observe AO 0235+16 in the 2003-2004 observing season. Results from radio-to-optical monitoring and XMM-Newton observations

2001A&A...377..396R

Raiteri, C. M. et al.

Optical and radio variability of the BL Lacertae object AO 0235+16: A possible 5-6 year periodicity

2001A&A...376...69C

CHEN, Y., JIANG

THE SPECTRAL ENERGY DISTRIBUTION OF AO 0235+164 DURING TWO ACTIVE OPTICAL PHASES

2000AJ....120...41W

WEBB, J., HOWARD

THE 1997 OUTBURST OF AO 0235+164: EVIDENCE FOR A MICROLENSING EVENT?

1996AJ....112.2533B

BURBIDGE, E. M

AO 0235+164 AND SURROUNDING FIELD: SURPRISING HST RESULTS

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