IGR J18175-1530: a new hard X-ray transient detected by INTEGRAL

A. Paizis; V. Beckmann; D. Gotz; L. Sidoli; A. Bazzano; G. Belanger; M. Cadolle Bel; J. Chenevez; A. De Rosa; E. Kuulkers; M. Falanga; M. Fiocchi; L. Kuiper; J. C Leyder; S. Mereghetti; S. Piraino; K. Pottschmidt; S.  Shaw; J. Tomsick; K. Watanabe; Roland Walter; G. Weidenspointner

IGR J18175-1530: a new hard X-ray transient detected by INTEGRAL

A. Paizis^*
, V. Beckmann
, D. Gotz
, L. Sidoli
, A. Bazzano
, G. Belanger
, M. Cadolle Bel
, J. Chenevez
, A. De Rosa
, E. Kuulkers
, M. Falanga
, M. Fiocchi
, L. Kuiper
, J. C Leyder
, S. Mereghetti
, S. Piraino
, K. Pottschmidt
, S. Shaw
, J. Tomsick
, K. Watanabe

Roland Walter, G. Weidenspointner

^*Corresponding author for this work

National Institute for Astrophysics
INTEGRAL Science Data Center
French Alternative Energies and Atomic Energy Commission
European Space Astronomy Centre
ESTEC
Commissariat à l’énergie atomique et aux énergies alternatives
SRON Netherlands Institute for Space Research
NASA Goddard Space Flight Center
University of California at Berkeley
Florida Gulf Coast University

Research output: Other contribution › Net publication - Internet publication › Research

Abstract

During the INTEGRAL Key Programme observations of the Galactic Centre (revolutions 599, 600 and 601, from 2007-09-09 to 2007-09-17), the IBIS/ISGRI telescope detected a new hard X-ray transient, IGR J18175-1530, at the position RA = 18 17 34.3, DEC= -15 30 41 (statistical error of 2.5'). The source is detected in the combined data set at 10 sigma in the 20-40 keV band with a rate of 1.5+-0.1 cps (about 9 mCrab) for an effective exposure time of 307 ksec, using OSA7 analysis software. IGR J18175-1530 is detected (6-7 sigma) also in the single revolution sky maps but it is neither detected at a single pointing level (2ksec), nor in the IBIS/ISGRI mosaic images in the 40-100 keV band. IGRJ18175-1530 has been in the IBIS/ISGRI field of view also prior to our detection, in August 2007 (revolutions 594, 595, 596) but was not detected. Unfortunately, IGR J18175-1530 was always too far off-axis (> 9 degrees) to be covered by JEM-X. An XMM-Newton observation of the source position performed on 2003-04-10 did not detect the object. We derive a 3-sigma upper limit of 3.3E-02 cps (0.3-12 keV, EPIC pn) at the source position. Using PIMMS and assuming a Crab-like spectrum with a 1e22cm-2 column density (the total Galactic in the source direction), we derive upper limits of 4e-13 ergs/cm/cm/s and 7e-13 ergs/cm/cm/s for the observed and unabsorbed source flux, respectively. This implies an upper limit to the luminosity of about 1e34 erg/s at 10 kpc. It is interesting to note that the radio source GPSR5 15.308+0.226 (RA = 274.41058, DEC = -15.52519, Becker et al. 1994) is 1.3' away from IGR J18175-1530, well within the IBIS/ISGRI location error (2.5'). INTEGRAL will not be monitoring this region in the next months, follow-up observations are encouraged

Original language	English
Publication date	25 Oct 2007
Publication status	Published - 25 Oct 2007

Series	The Astronomer's telegram
Number	ATel #1248

Keywords

Radio
X-ray
AGN
Binary
Black Hole
Cataclysmic Variable
Neutron Star,
Transient
Pulsar

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Paizis, A., Beckmann, V., Gotz, D., Sidoli, L., Bazzano, A., Belanger, G., Cadolle Bel, M., Chenevez, J., De Rosa, A., Kuulkers, E., Falanga, M., Fiocchi, M., Kuiper, L., Leyder, J. C., Mereghetti, S., Piraino, S., Pottschmidt, K., Shaw, S., Tomsick, J., ... Weidenspointner, G. (2007, Oct 25). IGR J18175-1530: a new hard X-ray transient detected by INTEGRAL. The Astronomer's telegram No. ATel #1248 http://www.astronomerstelegram.org/?read=1248

@misc{dbdff7a1489b43ab8d32501ad08065fa,

title = "IGR J18175-1530: a new hard X-ray transient detected by INTEGRAL",

abstract = "During the INTEGRAL Key Programme observations of the Galactic Centre (revolutions 599, 600 and 601, from 2007-09-09 to 2007-09-17), the IBIS/ISGRI telescope detected a new hard X-ray transient, IGR J18175-1530, at the position RA = 18 17 34.3, DEC= -15 30 41 (statistical error of 2.5'). The source is detected in the combined data set at 10 sigma in the 20-40 keV band with a rate of 1.5+-0.1 cps (about 9 mCrab) for an effective exposure time of 307 ksec, using OSA7 analysis software. IGR J18175-1530 is detected (6-7 sigma) also in the single revolution sky maps but it is neither detected at a single pointing level (2ksec), nor in the IBIS/ISGRI mosaic images in the 40-100 keV band. IGRJ18175-1530 has been in the IBIS/ISGRI field of view also prior to our detection, in August 2007 (revolutions 594, 595, 596) but was not detected. Unfortunately, IGR J18175-1530 was always too far off-axis (> 9 degrees) to be covered by JEM-X. An XMM-Newton observation of the source position performed on 2003-04-10 did not detect the object. We derive a 3-sigma upper limit of 3.3E-02 cps (0.3-12 keV, EPIC pn) at the source position. Using PIMMS and assuming a Crab-like spectrum with a 1e22cm-2 column density (the total Galactic in the source direction), we derive upper limits of 4e-13 ergs/cm/cm/s and 7e-13 ergs/cm/cm/s for the observed and unabsorbed source flux, respectively. This implies an upper limit to the luminosity of about 1e34 erg/s at 10 kpc. It is interesting to note that the radio source GPSR5 15.308+0.226 (RA = 274.41058, DEC = -15.52519, Becker et al. 1994) is 1.3' away from IGR J18175-1530, well within the IBIS/ISGRI location error (2.5'). INTEGRAL will not be monitoring this region in the next months, follow-up observations are encouraged",

keywords = "Radio, X-ray, AGN, Binary, Black Hole, Cataclysmic Variable, Neutron Star,, Transient, Pulsar",

author = "A. Paizis and V. Beckmann and D. Gotz and L. Sidoli and A. Bazzano and G. Belanger and \{Cadolle Bel\}, M. and J. Chenevez and \{De Rosa\}, A. and E. Kuulkers and M. Falanga and M. Fiocchi and L. Kuiper and Leyder, \{J. C\} and S. Mereghetti and S. Piraino and K. Pottschmidt and S. Shaw and J. Tomsick and K. Watanabe and Roland Walter and G. Weidenspointner",

year = "2007",

month = oct,

day = "25",

language = "English",

series = "The Astronomer's telegram",

publisher = "R. Rutledge",

number = "ATel \#1248",

type = "Other",

}

Paizis, A, Beckmann, V, Gotz, D, Sidoli, L, Bazzano, A, Belanger, G, Cadolle Bel, M, Chenevez, J, De Rosa, A, Kuulkers, E, Falanga, M, Fiocchi, M, Kuiper, L, Leyder, JC, Mereghetti, S, Piraino, S, Pottschmidt, K, Shaw, S, Tomsick, J, Watanabe, K, Walter, R & Weidenspointner, G 2007, IGR J18175-1530: a new hard X-ray transient detected by INTEGRAL. <http://www.astronomerstelegram.org/?read=1248>

TY - ICOMM

T1 - IGR J18175-1530: a new hard X-ray transient detected by INTEGRAL

AU - Paizis, A.

AU - Beckmann, V.

AU - Gotz, D.

AU - Sidoli, L.

AU - Bazzano, A.

AU - Belanger, G.

AU - Cadolle Bel, M.

AU - Chenevez, J.

AU - De Rosa, A.

AU - Kuulkers, E.

AU - Falanga, M.

AU - Fiocchi, M.

AU - Kuiper, L.

AU - Leyder, J. C

AU - Mereghetti, S.

AU - Piraino, S.

AU - Pottschmidt, K.

AU - Shaw, S.

AU - Tomsick, J.

AU - Watanabe, K.

AU - Walter, Roland

AU - Weidenspointner, G.

PY - 2007/10/25

Y1 - 2007/10/25

N2 - During the INTEGRAL Key Programme observations of the Galactic Centre (revolutions 599, 600 and 601, from 2007-09-09 to 2007-09-17), the IBIS/ISGRI telescope detected a new hard X-ray transient, IGR J18175-1530, at the position RA = 18 17 34.3, DEC= -15 30 41 (statistical error of 2.5'). The source is detected in the combined data set at 10 sigma in the 20-40 keV band with a rate of 1.5+-0.1 cps (about 9 mCrab) for an effective exposure time of 307 ksec, using OSA7 analysis software. IGR J18175-1530 is detected (6-7 sigma) also in the single revolution sky maps but it is neither detected at a single pointing level (2ksec), nor in the IBIS/ISGRI mosaic images in the 40-100 keV band. IGRJ18175-1530 has been in the IBIS/ISGRI field of view also prior to our detection, in August 2007 (revolutions 594, 595, 596) but was not detected. Unfortunately, IGR J18175-1530 was always too far off-axis (> 9 degrees) to be covered by JEM-X. An XMM-Newton observation of the source position performed on 2003-04-10 did not detect the object. We derive a 3-sigma upper limit of 3.3E-02 cps (0.3-12 keV, EPIC pn) at the source position. Using PIMMS and assuming a Crab-like spectrum with a 1e22cm-2 column density (the total Galactic in the source direction), we derive upper limits of 4e-13 ergs/cm/cm/s and 7e-13 ergs/cm/cm/s for the observed and unabsorbed source flux, respectively. This implies an upper limit to the luminosity of about 1e34 erg/s at 10 kpc. It is interesting to note that the radio source GPSR5 15.308+0.226 (RA = 274.41058, DEC = -15.52519, Becker et al. 1994) is 1.3' away from IGR J18175-1530, well within the IBIS/ISGRI location error (2.5'). INTEGRAL will not be monitoring this region in the next months, follow-up observations are encouraged

AB - During the INTEGRAL Key Programme observations of the Galactic Centre (revolutions 599, 600 and 601, from 2007-09-09 to 2007-09-17), the IBIS/ISGRI telescope detected a new hard X-ray transient, IGR J18175-1530, at the position RA = 18 17 34.3, DEC= -15 30 41 (statistical error of 2.5'). The source is detected in the combined data set at 10 sigma in the 20-40 keV band with a rate of 1.5+-0.1 cps (about 9 mCrab) for an effective exposure time of 307 ksec, using OSA7 analysis software. IGR J18175-1530 is detected (6-7 sigma) also in the single revolution sky maps but it is neither detected at a single pointing level (2ksec), nor in the IBIS/ISGRI mosaic images in the 40-100 keV band. IGRJ18175-1530 has been in the IBIS/ISGRI field of view also prior to our detection, in August 2007 (revolutions 594, 595, 596) but was not detected. Unfortunately, IGR J18175-1530 was always too far off-axis (> 9 degrees) to be covered by JEM-X. An XMM-Newton observation of the source position performed on 2003-04-10 did not detect the object. We derive a 3-sigma upper limit of 3.3E-02 cps (0.3-12 keV, EPIC pn) at the source position. Using PIMMS and assuming a Crab-like spectrum with a 1e22cm-2 column density (the total Galactic in the source direction), we derive upper limits of 4e-13 ergs/cm/cm/s and 7e-13 ergs/cm/cm/s for the observed and unabsorbed source flux, respectively. This implies an upper limit to the luminosity of about 1e34 erg/s at 10 kpc. It is interesting to note that the radio source GPSR5 15.308+0.226 (RA = 274.41058, DEC = -15.52519, Becker et al. 1994) is 1.3' away from IGR J18175-1530, well within the IBIS/ISGRI location error (2.5'). INTEGRAL will not be monitoring this region in the next months, follow-up observations are encouraged

KW - Radio

KW - X-ray

KW - AGN

KW - Binary

KW - Black Hole

KW - Cataclysmic Variable

KW - Neutron Star,

KW - Transient

KW - Pulsar

M3 - Net publication - Internet publication

T3 - The Astronomer's telegram

ER -

IGR J18175-1530: a new hard X-ray transient detected by INTEGRAL

Abstract

Keywords

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