Poshak Gandhi's publications

Invited Reviews

VISIR Observations of Local Seyfert Nuclei and the Mid-infrared - Hard X-ray Correlation (pdf)
H. Horst, P. Gandhi, A. Smette, W. Duschl
The Messenger 135, 37-39

X-ray Studies of Active Galactic Nuclei (ps) (pdf)
P. Gandhi
Asian Jour Phys 13, 90 (2005)
Refereed special edition entitled "Twenty-first Century Astrophysics" in celebration of Einstein's centenary. Eds. S.K. Saha, V.K. Rastogi.

Refereed Publications

The flux-dependent rms variability of X-ray binaries in the optical
P. Gandhi
ApJ Letters 697, L167 (2009), astro-ph/0904.2791

Resolving the mid-infrared cores of local Seyferts
P. Gandhi, H. Horst, A. Smette, S.F. Hoenig, A. Comastri, R. Gilli, C. Vignali & W. Duschl
A&A in press (2009), astro-ph/0902.2777

Identification of New Near-Infrared DIBs in the Orion Nebula
T. Misawa, P. Gandhi, A. Hida, T. Tamagawa & T. Yamaguchi
ApJ in press (2009), astro-ph/0906.0819

Mid-infrared imaging of 25 local AGN with VLT-VISIR
H. Horst, W. Duschl, P. Gandhi & A. Smette
A&A 495, 137 (2009), astro-ph/0901.0106

Suzaku Observation of the Metallicity in the Interstellar Medium of NGC 4258
S. Konami, K. Sato, K. Matsushita, N. Isobe, A. Senda, A. Hayato, P. Gandhi T. Tamagawa & K. Makishima
PASJ in press (2009), astro-ph/0905.4366

Multiwavelength study of the bright X-ray source population in the interacting galaxies NGC5774/NGC5775 (pdf)
K.K. Ghosh, L. Saripalli, P. Gandhi, C. Foellmi, C.M. Gutierrez, M. Lopez-Corredoira
AJ 137, 3263 (2009), astro-ph/0810.5393

Rapid optical and X-ray timing observations of GX 339-4: flux correlations at the onset of a low/hard state (ps) (pdf)
P. Gandhi, K. Makishima, M. Durant, A.C. Fabian, V.S. Dhillon, T.R. Marsh, J.M. Miller, T. Shahbaz and H.C. Spruit
MNRAS 390, L29 (2008), astro-ph/0807.1529
PRESS RELEASE (ESO+NASA+RIKEN)

Spectral transitions of an ultraluminous X-ray source, NGC 2403 Source 3 (pdf)
N. Isobe, K. Makishima, H. Takahashi, T. Mizuno, R. Miyawaki, P. Gandhi, M. Kawaharada, A. Senda, T. Yoshida, A. Kubota, H. Kobori
PASJ 61, 279 (2008), astro-ph/0810.5188

Suzaku Observations of M82 X-1 : Detection of a Curved Hard X-ray Spectrum (pdf)
R. Miyawaki, K. Makishima, S. Yamada, P. Gandhi, T. Mizuno, A. Kubota, T. Tsuru, H. Matsumoto
PASJ 61, 263 (2008), astro-ph/0809.3339

Multiwavelength spectral and high time resolution observations of SWIFT J1753.5-0127: new activity?
M. Durant, P. Gandhi, T. Shahbaz, H.H. Peralta & V.S. Dhillon
MNRAS 392, 309 (2008), astro-ph/0810.1141

SWIFT J1753.5-0127: a surprising optical/X-ray cross-correlation function (pdf)
M. Durant, P. Gandhi, T. Shahbaz, A. Fabian, J. Miller, V.S. Dhillon, T.R. Marsh
ApJ 682, L45 (2008), astro-ph/0806.2530

Discovery of a strong Baldwin effect in mid-infrared AGN lines (pdf)
S.F. Hoenig, A. Smette, T. Beckert, H. Horst, W. Duschl, P. Gandhi, M. Kishimoto, G. Weigelt
A&A 485, L21 (2008), astro-ph/0805.2151

The mid IR -- hard X-ray correlation in AGN and its implications for dusty torus models
H. Horst, P. Gandhi, A. Smette, W. Duschl
A&A 479, 389 (2008), astro-ph/0711.3734

The effect of radiation pressure on absorbing material in AGN
A.C. Fabian, R. Vasudevan, P. Gandhi
MNRAS 385, L43 (2008), astro-ph/0712.0277

Discovery of a bright transient ultraluminous X-ray source Suzaku J1305-4931 in NGC 4945
N. Isobe, A. Kubota, K. Makishima, P. Gandhi, R.E. Griffiths, G.C. Dewangan, T. Itoh, T. Mizuno
PASJ 60, 241 (2008), Suzaku special issue, astro-ph/0708.1804

Suzaku wide-band X-ray Spectroscopy of the Seyfert 2 AGN in NGC 4945
T. Itoh, C. Done, K. Makishima, G. Madejski, H. Awaki, N. Isobe, P. Gandhi, G.C. Dewangan, R.E. Griffiths, N. Anabuki et al.
PASJ 60, 251 (2008), Suzaku special issue, astro-ph/0708.1201

Constraints on light bending and reflection from the hard X-ray background (ps) (pdf)
P. Gandhi, A.C. Fabian, T. Suebsuwong, J. Malzac, G. Miniutti & R.J. Wilman
MNRAS 382 1005 (2007), astro-ph/0709.1984

The XMM large scale structure survey: optical vs. X-ray classifications of active galactic nuclei and the unified scheme
O. Garcet, P. Gandhi, E. Gosset et al.
A&A 474 473 (2007), astro-ph/0709.2077

The XMM-LSS catalogue: X-ray sources and associated optical data. Version I
M. Pierre, L. Chiappetti, F. Pacaud, A. Gueguen, C. Libbrecht, B. Altieri, H. Aussel, P. Gandhi et al.
MNRAS 382 279 (2007), astro-ph/0708.3299

The XMM Large Scale Structure Survey: Properties and Two-Point Angular Correlations of Point-like Sources (gzipped version) (pdf)
P. Gandhi, O. Garcet, L. Disseau, F. Pacaud, M. Pierre, A. Gueguen, D. Alloin, L. Chiappetti, E. Gosset, D. Maccagni, J. Surdej and I. Valtchanov
A&A 457 393 (2006), astro-ph/0607135

4C +39.29 - Extended emission around a powerful Type 2 Quasar (gzipped version) (pdf)
P. Gandhi, A.C. Fabian and C.S. Crawford
MNRAS 369 1566 (2006), astro-ph/0604184

The small dispersion of the mid IR - hard X-ray correlation in AGN (pdf)
H. Horst, A. Smette, P. Gandhi, and W. Duschl
A&A 457 L17 (2006), astro-ph/0608358

Have we detected the most luminous ULX so far? (pdf)
G. Miniutti, G. Ponti, M. Dadina, M. Cappi, G. Malaguti, A.C. Fabian and P. Gandhi
MNRAS 373 L1 (2006), astro-ph/0607501

The XMM Large Scale Structure Survey: The X-ray pipeline and survey selection function
F. Pacaud, M. Pierre, A. Refregier, A. Gueguen, J.-L. Starck, I. Valtchanov, A.M. Read, B. Altieri, L. Chiappetti, P. Gandhi, O. Garcet, E. Gosset, T.J. Ponman, J. Surdej
MNRAS 372 578 (2006), astro-ph/0607177.

The First Chandra Field (pdf)
M. Weisskopf, T. Aldcroft, R. Cameron, P. Gandhi, C. Foellmi, R. Elsner, S. Patel, K. Wu and S O'Dell
ApJ 637 682 (2006), astro-ph/0509053

The XMM-LSS survey. Survey design and first results (pdf 1.9 MB)
M. Pierre, ..., P. Gandhi ... (+ 32 co-authors)
Jour Cosm Astropart Phys 09 11 (2004), astro-ph/0305191

Powerful obscured AGN among X-ray hard, optically-dim serendipitous Chandra source (gzipped version) (pdf)
P. Gandhi, C.S. Crawford, A.C. Fabian and R.M. Johnstone
MNRAS 348 529 (2004), astro-ph/0310772

Revealing powerful obscured AGN through the X-ray background (full thesis gzipped ps 6Mb file)
P. Gandhi
University of Cambridge
Refereed abstract available in The Observatory Magazine 123 405 (2003)

X-ray background synthesis: the infrared connection (gzipped version) (pdf)
P. Gandhi and A.C. Fabian
MNRAS 339 1095 (2003), astro-ph/0211129

Optical and near-infrared observations of hard serendipitous Chandra sources (gzipped version) (pdf)
C.S. Crawford, P. Gandhi and A.C. Fabian
Astronomische Nachrichten AN 324 117 (2003), Refereed issue dedicated to the proceedings of the workshop "X-ray Surveys in the light of New Observatories", Sep. 2002, Santander, Spain, astro-ph/0211400

VLT near-IR spectra of hard serendipitous Chandra sources (gzipped version) (pdf)
P. Gandhi, C.S. Crawford and A.C. Fabian
MNRAS 337 781 (2002), astro-ph/0206433

Multi-wavelength observations of serendipitous Chandra X-ray sources in the field of A2390 (gzipped version) (pdf)
C.S. Crawford, P. Gandhi, A.C. Fabian, R.J. Wilman, R.M. Johnstone, A.J. Barger and L.L. Cowie
MNRAS 333 809 (2002), astro-ph/0106067

Hot dust in two hard Chandra X-ray sources (gzipped version) (pdf)
R.J. Wilman, A.C. Fabian and P. Gandhi
MNRAS 318 L11 (2000), astro-ph/0008181

Infrared observations of serendipitous hard Chandra X-ray sources (gzipped ps) (pdf)
C.S. Crawford, A.C. Fabian, P. Gandhi, R.J. Wilman and R.M. Johnstone
MNRAS 324 427 (2001), astro-ph/0005242

Conference Proceedings

An Optical Rms-flux Relation And Non-linear Variability In X-ray Binaries
P. Gandhi
AAS 214, #301.02, Pasadena, CA 2009 Jun 7-11. Bulletin of the American Astronomical Society, Vol. 41, p.714.

Resolved mid-infrared imaging of Seyferts: an isotropic probe of AGN luminosity (pdf)
P. Gandhi
"AKARI, a light to illuminate the misty Universe": Proc. Akari conference (Tokyo Japan; Feb 16 - 19 2009) Published as ASP conference series

Light bending and the hard X-ray background (pdf)
P. Gandhi
"Astrophysics with All-Sky X-Ray Observations": Proc. 3rd international MAXI Workshop (Saitama Japan; Jun 10 - 12 2008), p.264

Two fascinating X-ray to optical cross-correlation functions
M. Durant and P. Gandhi
Proceedings of Science Conf Series PoS(MQW7)003; "VII Microquasar Workshop: Microquasars and Beyond" (Izmir, Turkey; Sep 1 - 5 2008)

Simultaneous Optical And X-ray Flickering Observations Of GX 339-4: Correlations On Sub-second Timescales (pdf)
P. Gandhi, K. Makishima, A.C. Fabian, M. Durant, T. Shahbaz, V. Dhillon, T. Marsh, J.M. Miller, H. Spruit
HEAD meeting #10, #01.06 (Los Angeles; Mar 31 - Apr 3 2008)

Simultaneous Optical And X-ray Flickering Observations Of GX 339-4 (pdf)
P. Gandhi
AIP Conf Series 1053 177 (2008); "Observational evidence for black holes in the Universe" (Kolkata; Feb 10 - 15 2008)

The Dispersion of the MIR -- Hard X-ray Correlation in AGN
H. Horst, A. Smette, P. Gandhi, W.J. Duschl
Relativistic Astrophysics Legacy and Cosmology - Einstein's, ESO Astrophysics Symposia, Volume . ISBN 978-3-540-74712-3. Springer-Verlag Berlin Heidelberg, 2008, p. 227

Angular Clustering of Obscured Active Galactic Nuclei (pdf)
P. Gandhi, O. Garcet, L. Disseau, F. Pacaud, M. Pierre, A. Gueguen, D. Alloin, L. Chiappetti, E. Gosset, D. Maccagni, J. Surdej, I. Valtchanov
American Astronomical Society, HEAD meeting #9 (San Francisco, 2006 Oct 4-7).

The Dispersion of the MIR -- Hard X-ray Correlation in AGN (gzipped ps)
H. Horst, A. Smette, P. Gandhi and W.J. Duschl
Proc. "Relativistic Astrophysics and Cosmology - Einstein's Legacy" (Garching 7-11 Nov 2005), eds. G.Hasinger,B. Aschenbach and B.Leibundgut.

Angular Clustering of X-ray point-like sources in the XMM Large Scale Structure survey (pdf)
O. Garcet, P. Gandhi, E. Gosset, A. Gueguen, F. Pacaud, M. Pierre and J. Surdej
Proc. "The X-ray Universe 2005" (El Escorial, Spain 26-30 Sep 2005), ESA Publications

The first Chandra field: the identification of Leon X-1
Weisskopf M.C., Aldcroft T., Cameron R.A., Gandhi P., Foellmi C., Elsner R.F., Patel S.K., O'Dell S.L.
American Astronomical Society, HEAD meeting #8, #16.39; Bulletin of the American Astronomical Society, Vol. 36, p.935

Obscured AGN and Type II QSOs in Chandra cluster fields (gzipped version) (pdf)
P. Gandhi, M.A. Worsley, C.S. Crawford and A.C. Fabian
Proc. "Multiwavelength AGN surveys" (Cozumel, December 8-12 2003), ed. R. Maiolino and R. Mujica

Powerful obscured AGN in Chandra cluster fields (gzipped version) (pdf)
P. Gandhi, A.C. Fabian and C.S. Crawford
Proc. Symposium "New Visions of the X-ray Universe in the XMM-Newton and Chandra Era" 26-30 November 2001, ESTEC, The Netherlands astro-ph/0201543

Multi-wavelength Observations of serendipitous Chandra sources (gzipped version) (pdf)
P. Gandhi, C.S. Crawford, A.C. Fabian, R.J. Wilman, R.M. Johnstone, A.J. Barger, L.L. Cowie
Proceedings of the XXI Moriond Astrophysics Meeting: "Galaxy Clusters and the High Redshift Universe Observed in X-rays", edited by D. Neumann, F.Durret & J. Tran Thanh Van, astro-ph/0106139

Posters

How common is light bending?
P. Gandhi, A.C. Fabian, T. Suebsuwong, J. Malzac and G. Miniutti
Suzaku conference; San Diego, USA; 2007 December.

Angular Clustering of Obscured AGN
P. Gandhi, O. Garcet, L. Disseau, F. Pacaud, M. Pierre, A. Gueguen, D. Alloin, L. Chiappetti, E. Gosset, D. Maccagni, J. Surdej and I. Valtchanov
UK-XRA 2006, held at MSSL; 2006 July 11.

X-ray Background Synthesis: the Infrared Connection
P. Gandhi and A.C. Fabian
Four years of Chandra observations, held at Hunstville Alabama; 2003 Sep 16-18.

On the nature of the hard X-ray Background sources
P. Gandhi and A.C. Fabian
RAS discussion meeting in London; 2001 Feb 9

The Black Hole at the Galactic Centre
Poster (16 MB file!) for the general public at the RIKEN Open House (2007 Apr 21).
For more information on the Galactic Centre observations, see this MPE page.

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